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ّ٫ႅĂብߔߘĂ ऩႅျ ٻॎಹ M
19-3507; Rev 1; 3/06 ғ ৹໗ޥಂ ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ________________________________໎၂ MAX1515 ก࠽ߔڱ෫ࣺĂୀਝٻቨ(PWM)ᆚ־/ྮ൩ျऩ ႅ DC-DC ኪࡳಹLjከཛྷӖࣝӊࠧ႓Ӗࣝӊ٫ቲّو٫ ႅᅘᆚቷڭ٫ᆚࢪာ౮ዩ٫ᆚۚᅍࡧăݡಹऔብ ޔn لޱMOSFET Lj໗ݽષပଔԌऋඵષᆐऔืફăԥၖ༶ ेဒ໎ࢱ۠ࣁߘăດࡱࣅ֑ષქޔዔফߔLjᄜۚෛണ ષ༶ԩዔফ۠ࣁߘăԩ و40mΩ NMOS ޢଔߔഁ ᆚྮࠧ־൩ ؕݽ3A وઘၦݘᆾ٫ૣă MAX1515 وพ־ ٫ႅ৹ᇀ +0.5V ባ +2.7V و۶ཙٻሿLjပଔ ؕݽ95%ă ♦ ♦ ♦ ♦ ♦ ♦ MAX1515 ৹ዷཛྷ DDR ٻॎಹෳᅋLjդූქॽޔവᅢ، ಹ٫ᆚ҈ܹቲ٧وพ־ăޢଔ࣌وพ൩৹ടዔ،ಹ ዔو٫ᆚLjሦჅ৹ჾѿફ۵٫ᆚLj໗ݽ٫ᆚပ ଔăMAX1515 ࡱብქࢱޔኼࡲ֭ಹLj৹໗ ޥ±5mA و ഝڑ٫ૣă ♦ MAX1515 Գᅋქቸ໎ᅘو٫ૣனĂ࠽ߔڱ෫ࣺ PWM ਈቨ۽ăഁᆾޠዷ෫Lj৹ၭوୀ֭னү֞ݽ ပଔLjԌୄዣᆚྮࠧ־൩٫ૣეഓăMAX1515 ნ৹ޠዷ ᇀ߈ڊ౷ଔ PWM னLjୄዣّพླྀ־Ԓوეഓă৹Ӭ֔ ࠽ߔڱ෫ࣺॕහڊߔ౷ଔዮݽባ 1MHzLjᆰၛᅋᇀ ပଔĂพ־ߔᇑĂᆐऔ֧֑ࠧ؍ӊቐࣺ६ှ౿࠼Lj ࢩهዮࣧوዛࠩ၂ă MAX1515 و൫ಶڑ၂৹ჾᅑ ᅋ६ှහብLjۚቨಶڑ෫وਖ਼ᅇ٫ૣLjّࠞޢ ߔڱன࿒ڱพࠧ־พ൩Ljෳ٫ᆚ٫ૣऩባ 1μ A ă MAX1515 Գᅋ؞ҿஎଭࠒర و24 ᄧहҭျ QFN ܢኰă ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ࠆใଁ 40mΩ وn لޱMOSFET ࣅ֑ષዔফߔ พ൩٫ႅ۶ཙཛྷ +1.3V ባ +3.6V ᇀሿޔพ൩ࠧݘᆾ۶ཙ VOUT ॽڪཛྷ 1% ዮؙߔ౷ଔ৹ؕ 1MHz ৹ᅋዷ DDR ቷٻڭॎಹ(DDR ன ) ޘዙพ־٫ႅ ৹ᆚ־/ྮ൩٫ૣوୀ֭۽ ࢱኼࡲ֭وഝڑ٫ૣཛྷ ±5mA พ־٫ႅ( ܇DDR ன )ǖ +2.5VĂ+1.8V ࢪ +1.5V ᄧह৹ၭ +0.5V ባ +2.7V ৹ٻ 1.1V ±0.75% ࢱኼ٫ႅพ־ ৹ٻॎ൫ಶڑቨਖ਼ᅇ٫ૣ ߔڱ٫ૣ < 1μA (٨ျ ) ޠዷ٫ૣ < 800μA (٨ျ ) ഁᆾ෫६൩৹ၭوୀ֭ன ቁࣁ၂ᅳࣁݘ၂٫ૣቨ ٫ᆚটၥזਊӔृಹ พଁڮ־ү _______________________________________ ྲဳڊ PART TEMP RANGE PKG CODE MAX1515ETG -40°C to +85°C 24 Thin QFN 4mm x 4mm T2444-4 MAX1515ETG+ -40°C to +85°C 24 Thin QFN 4mm x 4mm T2444-4 ____________________________________________ ᄮᅋ Ӗࣝӊ٫ DDR ،ಹቷڭ PINPACKAGE ᅘᆚቷڭዜ + ӹྐೆܢኰă ာ౮ዩ/༐ြಹ٫ᆚ _________________________ईࡧޠዷ٫ଁ VBIAS (3.0V TO 3.6V) VDD BST VIN (1.3V TO 3.6V) IN VCC COMP PGOOD SHDN MODE MAX1515 VOUT = VTT LX FB PGND GND SKIP REF VDDQ (2.5V OR 1.8V) FBSEL0 FBSEL1 VREFOUT = VTTR REFOUT REFIN SS ᄧहైብᇀืযዊوዮࡍ־ޖă TOFF ________________________________________________________________ Maxim Integrated Products 1 ӊྲྀก Maxim ቁᄪྲྀዊوᄕྲྀLjMaxim ԥۭڶᄕቲ،ᇀوᄖࢪᅑױդූݘྥؓوᇖăഋኢᄌᄕྲྀቲ৹،ᇀྲྀዖዩቑࢪ ۭᄕؓྥLjၖവ്ൌࠨװᅷوኼവ၂LjഋԸ৬ Maxim ໗وޥᄪྲྀҔዊă www.BDTIC.com/maxim ຏടஊܑჅ౹ࠧዮူҔืوযዊLjഋ ོ܃Maxim وኙოǖwww.maxim-ic.com.cnă MAX1515 ________________________________ ݣะ MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ABSOLUTE MAXIMUM RATINGS VCC, VDD, LX, SHDN to GND ...................................-0.3V to +4V MODE, IC to GND ....................................................-0.3V to +4V COMP, FB, REF, REFIN, REFOUT, PGOOD to GND.........................................................-0.3V to (VCC + 0.3V) FBSEL0, FBSEL1, TOFF, SKIP, SS to GND ...-0.3V to (VCC + 0.3V) VDD to VCC ...........................................................-0.3V to + 0.3V IN to VDD ....................................................-0.3V to (VDD + 0.3V) PGND to GND ...................................................... -0.3V to +0.3V LX to BST................................................................. -4V to +0.3V BST to GND .......................................................... -0.3V to +8.0V LX Current (Note 1).............................................................±4.7A REF Short Circuit to GND ...........................................Continuous REFOUT Short Circuit to GND....................................Continuous Continuous Power Dissipation (TA = +70°C) 24-Pin Thin QFN (derate 20.8mW/°C above +70°C; part mounted on 1in2 of 1oz copper)........................1667mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: LX has clamp diodes to PGND and IN. If continuous current is applied through these diodes, thermal limits must be observed. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VIN = +3.3V, VCC = VDD = SHDN = MODE = +3.3V, VREFIN = VREF, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range VIN 1.3 3.6 VCC, VDD 3.0 3.6 0.5 2.7 VOUT ≤ VIN Output Adjust Range VFB VREFIN VIN = +3.3V, ILOAD = 0, MODE = VCC TA = +25°C to +85°C -3 0 +3 TA = 0°C to +85°C -4 0 +4 2.463 2.5 2.537 2.450 2.5 2.550 1.782 1.800 1.827 VFB 1.773 1.800 1.836 1.477 1.500 1.523 1.470 1.500 1.530 TA = +25°C to +85°C 0.492 0.500 0.508 TA = 0°C to +85°C 0.490 0.500 0.510 TA = +25°C FBSEL0 = VCC, to +85°C FBSEL1 = GND, TA = 0°C to REFIN = REF VIN = +3.3V, +85°C ILOAD = 0, TA = +25°C MODE = low FBSEL0=GND to +85°C FBSEL1=VCC TA = 0°C to REFIN=REF +85°C FBSEL0=GND FBSEL1=GND REFIN=0.5V Feedback Load-Regulation Error 2 V mV TA = +25°C FBSEL0 = VCC, to +85°C FBSEL1 = VCC, TA = 0°C to REFIN = REF +85°C Feedback Voltage Accuracy V VIN = +1.3V to +3.6V, ILOAD = 0 to 3A, SKIP = VCC V 0.1 _______________________________________________________________________________________ www.BDTIC.com/maxim % ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ (Circuit of Figure 1, VIN = +3.3V, VCC = VDD = SHDN = MODE = +3.3V, VREFIN = VREF, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS Sink-Mode Detect Threshold VFB VREFIN MODE = VCC, VREFIN = +0.5V to +1.5V Source-Mode Detect Threshold VFB VREFIN MODE = VCC, VREFIN = +0.5V to +1.5V MOSFET On-Resistance RNMOS VCC = VDD = VIN = +3.3V, ILOAD = 0.5A Switching Frequency Maximum Output Current Current-Limit Threshold Pulse-Skipping Current Threshold Zero Cross Current Threshold MAX UNITS +18 +32 mV -32 -18 mV 0.10 Ω 1 MHz 0.04 fSW (Note 2) (Note 3) 3.3 ILIMIT_P VIN = +3.3V, MODE = GND or VCC, positive or sourcing mode 3.60 ILIMIT_N MODE = VCC, negative or sinking mode ISKIP_P VIN = +3.3V, MODE = GND or VCC, positive or sourcing mode IZX_P VIN = +3.3V, MODE = GND or VCC, positive or sourcing mode 200 IZX_N MODE = VCC, negative or sinking mode -350 FB = 1.01 x VTARGET (Note 4) tOFF Extended Off-Time TYP IOUT(RMS) FB Input Bias Current Off-Time MIN VFB > 0.3 x VTARGET (Note 4) A 4.2 4.85 A -3.0 0.5 0.8 -50 1.1 A mA +50 RTOFF = 33.2kΩ 0.270 0.34 0.405 RTOFF = 110kΩ 0.85 1.00 1.15 RTOFF = 499kΩ 3.8 4.5 5.2 4x tOFF nA μs tOFF(EXT) VFB < 0.3 x VTARGET (Notes 2, 4) Minimum On-Time tON(MIN) (Note 2) 180 ns Maximum On-Time tON(MAX) 5 11 μs SS Source Current ISS(SRC) 3.50 5.25 SS Sink Current ISS(SNK) 100 No-Load Supply Current Shutdown Supply Currents μs 6.75 μA MODE = GND, FBSEL0 = GND, FBSEL1 = GND, VFB = 1.01 x VTARGET 450 MODE = VCC, VFB = VTARGET 700 1200 SHDN = MODE = GND, LX = 0V or 3.3V 0.2 20 IIN SHDN = MODE = GND, LX = 0V 0.2 20 ILX SHDN = MODE = GND, LX = 3.3V 0.1 20 ICC + IDD + IIN ICC + IDD + IIN VIN = 3.3V (not switching) (Note 4) μA 800 μA μA _______________________________________________________________________________________ www.BDTIC.com/maxim 3 MAX1515 ELECTRICAL CHARACTERISTICS (continued) MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VIN = +3.3V, VCC = VDD = SHDN = MODE = +3.3V, VREFIN = VREF, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX TA = +25°C to +85°C 1.0923 1.100 1.1077 TA = 0°C to +85°C 1.0907 1.100 1.1094 UNITS REFERENCE Reference Voltage VREF Reference Load Regulation V IREF = -1μA to +50μA REFIN Input Voltage Range VREFIN REFOUT Output Accuracy VREFIN VREFOUT REFIN Input Bias Current VCC = +3.0V to +3.6V VCC = +3.0V to +3.6V 10 mV 0.5 1.5 V VREFIN = +0.5V to +1.5V IREFOUT = -1mA to +1mA -10 +10 VREFIN = +0.5V to +1.5V IREFOUT = -5mA to +5mA -20 +20 -50 +50 mV IREFIN VREFIN = 1.1V TSHDN Rising, hysteresis = 15°C nA FAULT DETECTION Thermal Shutdown Undervoltage-Lockout Threshold +165 °C VCC(UVLO) VCC rising, 2% falling-edge hysteresis 2.5 2.7 2.9 V PGOOD Trip Threshold (Lower) No load, falling edge, hysteresis = 1% -13 -10 -7 % PGOOD Trip Threshold (Upper) No load, rising edge, hysteresis = 1% +7 +10 +13 % PGOOD Propagation Delay tPGOOD FB forced 2% beyond PGOOD trip threshold PGOOD Output Low Voltage ISINK = 1mA PGOOD Leakage Current Condition High state, forced to 3.6V; VCC = VDD = 3.6V 10 μs 0.1 V 1 μA INPUTS AND OUTPUTS Logic Input High Voltage SKIP, SHDN, MODE, FBSEL0, FBSEL1 Logic Input Low Voltage SKIP, SHDN, MODE, FBSEL0, FBSEL1 Logic Input Current SKIP, SHDN, MODE, FBSEL0, FBSEL1 4 2.0 -0.5 V 0.8 V +0.5 μA _______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ (Circuit of Figure 1, VIN = +3.3V, VCC = VDD = SHDN = MODE = +3.3V, VREFIN = VREF, SKIP = GND, TA = -40°C to +85°C, unless otherwise noted. Note 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PWM CONTROLLER Input Voltage Range VIN 1.3 3.6 VCC, VDD 3.0 3.6 VOUT ≤ VIN 0.5 VCC V VIN = +3.3V, ILOAD = 0, MODE = VCC -5 +5 mV FBSEL0 = VCC, FBSEL1 = VCC, REFIN = REF 2.438 2.562 FBSEL0 = VCC, FBSEL1 = GND, REFIN = REF 1.755 1.845 Output Adjust Range VFB VREFIN Feedback Voltage Accuracy VFB VIN = +3.3V, ILOAD = 0, MODE = low V V FBSEL0 = GND, FBSEL1 = VCC, REFIN = REF 1.463 1.538 FBSEL0 = GND, FBSEL1 = GND, REFIN = 0.5V 0.487 0.513 Sink-Mode Detect Threshold VFB VREFIN MODE = VCC, VREFIN = +0.5V to +1.5V +15 +35 mV Source-Mode Detect Threshold VFB VREFIN MODE = VCC, VREFIN = +0.5V to +1.5V -35 -15 mV nFET On-Resistance RNMOS VCC = VDD = VIN = +3.3V, ILOAD = 0.5A Switching Frequency fSW 0.10 Ω 1 MHz (Note 2) Current-Limit Threshold ILIMIT_P VIN = +3.3V, MODE = GND or VCC, positive or sourcing mode 3.35 5.05 A Pulse-Skipping Current Threshold ISKIP_P VIN = +3.3V, MODE = GND or VCC, positive or sourcing mode 0.4 1.2 A RTOFF = 33.2kΩ 0.250 0.425 RTOFF = 110kΩ 0.8 1.2 RTOFF = 499kΩ 3.8 5.2 Off-Time tOFF VFB > 0.3 x VTARGET (Note 4) Maximum On-Time tON(MAX) 5 SS Source Current ISS(SRC) 3 SS Sink Current ISS(SNK) 100 μs μs 7 μA μA _______________________________________________________________________________________ www.BDTIC.com/maxim 5 MAX1515 ELECTRICAL CHARACTERISTICS MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, VIN = +3.3V, VCC = VDD = SHDN = MODE = +3.3V, VREFIN = VREF, SKIP = GND, TA = -40°C to +85°C, unless otherwise noted. Note 5) PARAMETER No-Load Supply Current Shutdown Supply Currents SYMBOL ICC + IDD + IIN ICC + IDD + IIN CONDITIONS VIN = 3.3V (Note 4) MIN TYP MAX MODE = GND, FBSEL0 = FBSEL1 = GND, VFB = 1.01 x VTARGET 900 MODE = VCC VFB = VTARGET 1300 UNITS μA SHDN = MODE = GND, LX = 0V or 3.3V 20 IIN SHDN = MODE = GND, LX = 0V 20 ILX SHDN = MODE = GND, LX = 3.3V 20 μA REFERENCE Reference Voltage VREF Reference Load Regulation REFIN Input Voltage Range REFOUT Output Accuracy VCC = +3.0V to +3.6V 1.086 1.114 V 12 mV V IREF = -1μA to +50μA VREFIN VREFIN VREFOUT VCC = +3.0V to +3.6V, VCC > VREFIN + 1.35V 0.5 1.5 VREFIN = +0.5V to +1.5V IREFOUT = -1mA to +1mA -15 +15 VREFIN = +0.5V to +1.5V IREFOUT = -5mA to +5mA -25 +25 mV FAULT DETECTION Undervoltage-Lockout Threshold VCC(UVLO) VCC rising, 2% falling-edge hysteresis 2.40 2.95 V PGOOD Trip Threshold (Lower) No load, falling edge, hysteresis = 1% -13 -7 % PGOOD Trip Threshold (Upper) No load, rising edge, hysteresis = 1% +7 +13 % Logic Input High Voltage SKIP, SHDN, MODE, FBSEL0, FBSEL1 2.0 Logic Input Low Voltage SKIP, SHDN, MODE, FBSEL0, FBSEL1 INPUTS AND OUTPUTS Note 2: Note 3: Note 4: Note 5: 6 V 0.8 Guaranteed by design. Not production tested. Not tested; guaranteed by layout. Maximum output current may be limited by thermal capability to a lower value. VTARGET is the set output voltage determined by VREFIN, FBSEL0, and FBSEL1. Specifications to -40°C are guaranteed by design, not production tested. _______________________________________________________________________________________ www.BDTIC.com/maxim V ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ (MAX1515 Circuit of Figure 1, VIN = 2.5V, VDD = VCC = SHDN = MODE = 3.3V, TA = +25°C, unless otherwise noted.) 1.25V OUTPUT EFFICIENCY vs. LOAD CURRENT 90 80 60 SOURCE, PWM SINK, PWM 50 SINK, PWM 30 30 20 20 VIN = 2.5V VOUT = 1.25V RTOFF = 110kΩ 10 0.01 0.1 10 0 0.001 10 1 0.1 60 SOURCE, PWM -1 20 0.01 80 3 4 SINK, SKIP 60 50 40 SOURCE, PWM VIN = 1.8V VOUT = 0.9V RTOFF = 220kΩ 10 0 0.001 10 1 SINK, PWM 20 0.01 0.1 LOAD CURRENT (A) 0.9V OUTPUT VOLTAGE vs. LOAD CURRENT SWITCHING FREQUENCY vs. LOAD CURRENT MAX1515 toc06 0.908 0.904 SOURCE, PWM 0.900 SINK, SKIP SOURCE, SKIP VIN = 1.8V VOUT = 0.9V RTOFF = 110kΩ 600 PWM MODE 500 400 300 200 SKIP MODE 100 0.892 10 1 LOAD CURRENT (A) SINK, PWM 2 SOURCE, SKIP 70 30 0.1 1 MAX1515 toc05 90 VIN = 1.8V VOUT = 0.9V RTOFF = 110kΩ 10 0 100 SINK, PWM 30 0.896 -2 -3 LOAD CURRENT (A) MAX1515 toc04 SINK, SKIP 0 0.001 SOURCE, SKIP VIN = 2.5V VOUT = 1.25V RTOFF = 110kΩ 10 1 EFFICIENCY (%) EFFICIENCY (%) 80 40 SINK, SKIP 0.9V OUTPUT EFFICIENCY vs. LOAD CURRENT SOURCE, SKIP 50 1.250 LOAD CURRENT (A) 90 70 SOURCE, PWM 1.242 0.01 0.9V OUTPUT EFFICIENCY vs. LOAD CURRENT 100 SINK, PWM 1.246 VIN = 2.5V VOUT = 1.25V RTOFF = 220kΩ LOAD CURRENT (A) OUTPUT VOLTAGE (V) 0 0.001 SOURCE, PWM 40 1.254 MAX1515 toc07 40 SINK, SKIP 60 SWITCHING FREQUENCY (kHz) 50 SOURCE, SKIP 70 EFFICIENCY (%) SINK, SKIP 70 OUTPUT VOLTAGE (V) 80 1.258 MAX1515 toc02 SOURCE, SKIP 90 EFFICIENCY (%) 100 MAX1515 toc01 100 1.25V OUTPUT VOLTAGE vs. LOAD CURRENT MAX1515 toc03 1.25V OUTPUT EFFICIENCY vs. LOAD CURRENT VIN = 2.5V VOUT = 1.25V 0 -3 -2 -1 0 1 LOAD CURRENT (A) 2 3 4 -3 -2 -1 0 1 2 3 4 LOAD CURRENT (A) _______________________________________________________________________________________ www.BDTIC.com/maxim 7 MAX1515 _______________________________________________________________ ٨ျޠዷ໎၂ ____________________________________________________________٨ျޠዷ໎၂(ၦ ) (MAX1515 Circuit of Figure 1, VIN = 2.5V, VDD = VCC = SHDN = MODE = 3.3V, TA = +25°C, unless otherwise noted.) REFOUT VOLTAGE REGULATION vs. LOAD CURRENT 1.260 1.100 4 1.255 TOFF (μs) REFOUT VOLTAGE (V) 1.102 5 MAX1515 toc09 1.265 MAX1515 toc08 1.104 TOFF TIME vs. TOFF RESISTOR 1.250 1.235 20 40 60 80 0 -15 100 -10 -5 0 5 10 15 0 REFOUT LOAD CURRENT (mA) REF LOAD CURRENT (μA) PEAK CURRENT LIMIT vs. SS VOLTAGE 100 200 300 TOFF RESISTOR (kΩ) STARTUP AND SHUTDOWN WAVEFORM (HEAVY LOAD) MAX1515 toc12 MAX1515 toc11 5 PEAK CURRENT LIMIT (A) 2 1 1.240 0 3 1.245 1.098 1.096 MAX1515 toc10 REF VOLTAGE vs. REF LOAD CURRENT REF VOLTAGE ERROR (V) MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ 4 3 3.3V 0 A 0 B 0 C 1A 2 D 0 1.25V 1 VIN = 2.5V VOUT = 1.25V RTOFF = 110kΩ E 0 SKIP = GND, RLOAD = 10Ω 0 1.0 1.2 1.4 SS VOLTAGE (V) 8 1.6 1.8 500μs/div A: PGOOD, 5V/div B: SS, 2V/div C: SHDN, 5V/div D: INDUCTOR CURRENT, 1A/div E: OUTPUT VOLTAGE, 1V/div _______________________________________________________________________________________ www.BDTIC.com/maxim 400 500 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ (MAX1515 Circuit of Figure 1, VIN = 2.5V, VDD = VCC = SHDN = MODE = 3.3V, TA = +25°C, unless otherwise noted.) STARTUP AND SHUTDOWN WAVEFORM (LIGHT LOAD) DDR-MODE LOAD TRANSIENT MAX1515 toc14 MAX1515 toc13 3.3V 0 A 0 B 0 0 C 0 2.5V A B 2A 1A D 0 1.25V C 0 2A E 0 D 1.25V SKIP = GND, RLOAD = 100Ω 20μs/div 1ms/div A: PGOOD, 5V/div B: SS, 2V/div C: SHDN, 5V/div A: LX, 2V/div B: LOAD CONTROL, 5V/div D: INDUCTOR CURRENT, 1A/div E: OUTPUT VOLTAGE, 1V/div C: INDUCTOR CURRENT, 2A/div D: OUTPUT VOLTAGE, 50mV/div SKIP = GND DDR-MODE LOAD TRANSIENT DDR-MODE LOAD TRANSIENT MAX1515 toc15 MAX1515 toc16 2.5V 2.5V A 0 A 0 B 0 2A B 0 2A C 0 -2A C 0 -2A D 1.25V D 1.25V 20μs/div A: LX, 2V/div B: LOAD CONTROL, 5V/div SKIP = GND C: INDUCTOR CURRENT, 2A/div D: OUTPUT VOLTAGE, 50mV/div 20μs/div A: LX, 2V/div B: LOAD CONTROL, 5V/div SKIP = GND C: INDUCTOR CURRENT, 2A/div D: OUTPUT VOLTAGE, 50mV/div _______________________________________________________________________________________ www.BDTIC.com/maxim 9 MAX1515 ____________________________________________________________٨ျޠዷ໎၂(ၦ ) MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ____________________________________________________________٨ျޠዷ໎၂(ၦ ) (MAX1515 Circuit of Figure 1, VIN = 2.5V, VDD = VCC = SHDN = MODE = 3.3V, TA = +25°C, unless otherwise noted.) DDR-MODE LOAD TRANSIENT DDR-MODE LOAD TRANSIENT MAX1515 toc18 MAX1515 toc17 2.5V 2.5V A A 0 0 B 0 B 0 2A 2A 0 C 0 D 1.25V C -2A -2A 1.25V D 20μs/div 20μs/div A: LX, 2V/div B: LOAD CONTROL, 5V/div A: LX, 2V/div B: LOAD CONTROL, 5V/div SKIP = GND C: INDUCTOR CURRENT, 2A/div D: OUTPUT VOLTAGE, 50mV/div SKIP = GND REFIN TRANSITION C: INDUCTOR CURRENT, 2A/div D: OUTPUT VOLTAGE, 50mV/div REFOUT LOAD TRANSIENT MAX1515 toc19 3.3V 0 1.5V MAX1515 toc20 A +10mA B -10mA A 1.0V 1.5V C 1.0V 2A 1.26V 0A D -2A B 1.24V 50μs/div A: PGOOD, 5V/div B: REFIN, 0.5V/div SKIP = GND 10 1.25V C: OUTPUT VOLTAGE, 0.5V/div D: INDUCTOR CURRENT, 2A/div 10μs/div A: REFOUT LOAD, 20mA/div B: REFOUT VOLTAGE, 10mV/div ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ᄧह ண֎ 1, 2 PGND 3 IC 4 VDD ّӫ MOSFET ᇨ࣌ഝ ࣆڑREFOUT ࡲ֭ಹو٫ᆚพ൩ăઘेባ࿅༇٫ᆚ(+3.0V ባ +3.6V)ăԳᅋ 1μF (ዮဏ)໋ׯ٫൛సଁ فPGNDăVDD ཛྷഝڑಹࠧ REFOUT ࡲ֭ಹޥ٫ă 5 REFOUT REFIN ࡲ֭พ־ă صMODE = VCC ෫Ljݡᄧहཛྷ REFIN ֭ࡲوพ־ăᅋქ ޔ0.47μF ໋ׯ٫൛సଁف GNDă صMODE = GND ෫LjREFOUT Ӈ९ቛă 6 SS 7 PGOOD 8 TOFF ޢ ޢଔٜăᇀಹऔԩᅳԩༀԧሿૣߔوᆚࣁઘăट ޔPGND ᄧहઘᇀქಲă . ԩઘेहăઘባ PGNDă ൫ಶڑăSS ڭᅳ GND ቐࣺेქ٫൛৹ჾቨಶڑ෫وਖ਼ᅇ٫ૣă ٫ᆚটၥพ־ăصพ־٫ႅݽᅢࢪّᅢڊې 10% ෫LjPGOOD พ־ཛྷّăصพ־٫ႅቁի෫Lj PGOOD ᅢݽየຢăߔڱன࿒ PGOOD พ־ཛྷّă ߔڱ෫ࣺၭᇗพ൩ăTOFF ᅳ GND ቐࣺઘेქቝ٫የٻॎߔڱ෫ࣺă ۴ਯพ൩ă DDR ன࿒(MODE = VCC)LjFB ٫ႅེڊᇀ REFIN ٫ႅණă ܇DDR ன࿒(MODE = GND)Ljቓेઘेفพ־৹໗ޥᆊڊพ־٫ႅLjࢪሣઘेف٫የܖႅಹჾ໗ޥ ৹ٻพ־٫ႅă 9 FB 10 COMP 11 VCC ன௨٫ᆚพ൩ă߹ქ ޔ10Ω הખ٫የઘेف࿅༇٫ᆚ(+3.0V ባ +3.6V)ăᅋ 1μF (ዮဏ )໋ׯ٫൛స ଁ فGNDă 12 GND ன௨ٜăटҿஎଭࠒరઘे فGNDă 13 REF +1.1V ࢱኼ٫ႅพ־ăᅋ 1.0μF సଁ٫൛సଁ فGNDă৹ཛྷ༶ԩݘᆾ໗ ޥ50μA ٫ૣăߔڱன࿒ࢱኼ Ӈߔӡă 14 REFIN ༶ԩࢱኼพ൩ăDDR ன࿒(MODE = VCC)LjREFIN හ ڊFB ٻॎ٫ႅă ܇DDR ன࿒(MODE = GND)Lj ट REFIN ઘे فREFă ࢵܖಹԣխăCOMP ڭᅳ VCC ቐࣺेქ ޔ470pF ٫൛ჾ෯ࢵܖԣխă ߔڱਈቨăّ٫౿෫ߔӡߔٻॎಹăSHDN ࠧ MODE ၭᇗ MAX1515 ޠوዷனă 15 SHDN SHDN MODE ํட ّ ّ ऩႅٻॎಹࠧ REFOUT ߔӡ ّ ݽ ऩႅٻॎಹߔӡLjREFOUT ޠዷ ݽ ّ ऩႅٻॎಹLj ܇DDR னLjREFOUT ߔӡ ݽ ݽ ऩႅٻॎಹLjDDR னLjREFOUT ޠዷ 16 MODE னၭᇗᄧहăMODE හٻڊॎಹཛྷ DDR னࢪ ܇DDR னLjԌਈቨ REFOUT ࡲ֭ಹă صMODE = VCC ෫LjMAX1515 ޠዷᇀ DDR னLjREFOUT ᅢޠዷኴຢă صMODE = GND ෫LjMAX1515 Ӈහڊ ཛྷ ܇DDR னLjREFOUT Ӈ९ቛăഉ৹Ըऑޠዷன(MODE) ԩܖă 17 FBSEL0 MODE = GND ෫Ljᅳ FBSEL1 ქༀහڊऩႅٻॎಹوพ־٫ႅă߷ MODE = VCCLjഋटದઘे فGNDă ______________________________________________________________________________________ www.BDTIC.com/maxim 11 MAX1515 ___________________________________________________________________ ᄧहํட MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ________________________________________________________________ᄧहํட(ၦ ) ᄧह ண֎ 18 FBSEL1 19 SKIP ୀ֭ਈቨพ൩ăڭݡᅳ VCC ઘ෫Ljာ౮ޠዷᇀّᇑوቨ PWM னăᅳ GND े෫Ljာ౮ޠ ዷᇀዔڑୀ֭னă 20 BST ઘेዔফܿڑ٫൛ăӶኼᄮᅋ٫ଁຑ( ༐ 1)Ljઘेქޔ༶ԩ و0.01μF ٫൛ă 21, 22 LX ٫ݮߔॎ٧ăLX กݽӫ NMOS ޢଔߔᆚࣁّࠧӫ NMOS ༀԧሿૣߔࣁوઘे٧ăट ޔLX ᄧहઘᇀქಲă 23, 24 IN ٫ᆚพ൩ăߔٻॎಹ٫ᆚ٫ႅพ൩ăઘे ف+1.3V ባ +3.6V ٫ᆚ٫ႅăट ޔIN ᄧहઘेᇀქಲă ޢ MODE = GND ෫Ljᅳ FBSEL0 ქༀහڊऩႅٻॎಹوพ־٫ႅă߷ MODE = VCCLjഋटದઘे فGNDă ӹ 1. Ӷኼᄮᅋᆐऔၭᇗ COMPONENT ±2A AT 1.25VOUT DDR MODE (MODE = VCC) ±2A AT 0.9VOUT DDR MODE (MODE = VCC) Input Voltage (VIN) 2.3V to 2.7V 1.6V to 2.0V Output Voltage (VOUT) 1.25V 0.9V CIN, Input Capacitor 33μF, 6.3V, ceramic TDK C3225XR0J336V 33μF, 6.3V, ceramic TDK C3225XR0J336V Switching Frequency (fSW) 250kHz 500kHz 250kHz 500kHz L, Inductor 2.5μH, 4.5A, Sumida CDRH8D28-2R5 1.2μH, 6.8A, Sumida CDR7D28MN-1R2 2.5μH, 4.5A, Sumida CDRH8D28-2R5 1.2μH, 6.8A, Sumida CDR7D28MN-1R2 COUT, Output Capacitor 330μF, 18mΩ Sanyo 2R5TPE330MI POSCAP 220μF, 18mΩ Sanyo 2R5TPE220MI POSCAP 330μF, 18mΩ Sanyo 2R5TPE330MI POSCAP 220μF, 18mΩ Sanyo 2R5TPE220MI POSCAP RTOFF 221kΩ, 1% 110kΩ, 1% 221kΩ, 1% 110kΩ, 1% _________________________Ӷኼᄮᅋ٫ଁ ӹ 2. ᆐऔޥᄮඨ SUPPLIER WEBSITE Coilcraft www.coilcraft.com Coiltronics www.coiltronics.com Kemet www.kemet.com Panasonic www.panasonic.com Sanyo www.sanyo.com Sumida www.sumida.com Taiyo Yuden www.t-yuden.com TDK www.component.tdk.com TOKO www.tokoam.com 12 MAX1515 Ӷኼᄮᅋ٫ଁ(༐ 1)৹դූ DDR ቷٻڭॎಹຑ ეഓوქଁޘዙพ־٫ႅࠧქଁࢱኼࡲ֭พ־ă٫ଁቲ وᆐऔၭᇗऑӹ 1Ljӹ 2 ຑ઼กޕᆐऔوቨᇒඨă _______________________________________ ࿈ํட MAX1515 ༀԧĂ٫ૣனĂ࠽ߔڱ෫ࣺ PWM DC-DC ኪ ࡳಹ৹ +1.3V ባ +3.6V وพ൩٫ႅऩႅ VIN ࢩ ه+0.5V ባ +2.7V وพ־٫ႅăMAX1515 ৹໗ ؕݽޥ3A وઘၦݘᆾ ٫ૣăԩࣅ֑ષ 40mΩ وNMOS ޢଔߔLj໗ݽષኪ ࡳပଔԌऋඵષᆐऔืફLjۚೲෛٸષዔফ۠ࣁߘࠧຑ ᅘ༶ԩဒ໎ࢱ۠ࣁߘ(༐ 2) ă ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ MAX1515 CBST 0.01μF VBIAS (3.0V TO 3.6V) R1 10Ω R2 100kΩ CVCC 1μF CVDD 1μF VDD VIN (1.3V TO 3.6V) BST IN COMP L 1.2μH MAX1515 PGND GND SHDN OFF MODE CREF 1μF COUT 220μF FB SKIP SKIP MODE ON VOUT = VTT = VDDC / 2 LX PGOOD PWM MODE VCC (DDR MODE) CIN 33μF VCC CCOMP 470pF FBSEL0 FBSEL1 REF RTOFF 110kΩ VREFOUT = VTTR REFOUT CREFOUT 0.47μF TOFF R3 10kΩ VDDQ 1% (2.5V OR 1.8V) CSS 0.01μF REFIN R4 10kΩ 1% RSS (OPTIONAL) SS CREFIN 0.01μF SEE TABLE 1 FOR COMPONENT SPECIFICATIONS ༐ 1. Ӷኼᄮᅋ٫ଁ༐ VCC FB FBSEL1 COMP FBSEL0 SS SKIP BST REF REF 1.1V GND FBSEL DECODE FB GAIN MODE PGOOD SOFTSTART PGOOD LOGIC REFOUT IN CURRENT SENSE (+/-) ZX(-) Gm VDD MAX1515 H-SIDE DRIVER ERR REF BUF PWM LOGIC SNK/SRC THRESHOLD REFIN MODE TIMER TOFF SNK SINK/ SOURCE SRC LOGIC VDD LX L-SIDE DRIVER CURRENT SENSE ZX(+) PGND SHDN ༐ 2. ޢਢ༐ ______________________________________________________________________________________ www.BDTIC.com/maxim 13 MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ +3.3V ౭ብ٫ᆚ(VCC ࠧ VDD ) MAX1515 وԩ٫ଁၖე 3.3V ౭ብ٫ᆚăիഉਦ࿒ݡ ౭ብ٫ᆚੂዔᅢӖࣝӊݽوပଔ (95%) 3.3V ࿅༇٫ᆚă ݡ3.3V ౭ብ٫ᆚၖე ޖޥVCC (PWM ਈቨಹ)ࠧ VDD (ᇨ ࣁഝࢱࠧڑኼࡲ֭ಹ٫ᆚ )Lj߆ױLjದዮؙ٫ૣᄮᅑ࿒ ৈڊǖ IBIAS = ICC + IREFOUT + fSW (QG(LOW) + QG(HIGH)) ቲLjI CC و٨ျཛྷ 450μALjfSW กߔ౷ଔLjQG(LOW) ࠧ QG(HIGH)กԩ MOSFET وᇨࣁዜ٫ࠣLjᆢཛྷ 1nCă ߷พ൩ᆚกქ ޔ3.0V ባ 3.6V ڊ߈و٫ᆚLj৹टพ൩٫ ᆚ ( V IN ) ᅳ 3.3V ౭ብพ൩ ( V CC ࠧ V DD ) ઘेᇀქಲă ߷ 3.3V ౭ብ٫ᆚ࿘ᅢพ൩٫ᆚණ٫Ljཛྷവүቁիوಶ ڑLjӤၙ႟֡ෳဳࠟ(SHDN ᅑّ)ݽفLjቓفพ൩٫ႅ ቁիă ٫ૣቨ MAX1515 ᅘܥ٫ૣቨޢLjჾӯᇀᆚ־/ྮ൩٫ૣ ߹ᆾࢪଁڮ෫үԩ وMOSFET ăᇀᆚ־ன࿒Ljص ٫ݮ٫ૣؙᅢ 4.2A ෫ਈቨಹߔݽڱӫ MOSFETăዮؙᆚ ־٫ૣࣜوާ࿒ǖ VOUT × t OFF 2×L ISOURCE _ MAX = ILIMIT _ P − ሦLjISOURCE_MAX กዮؙᆚ־٫ૣLjILIMIT_P กᆚ־෫ و٫ݮ٫ૣණ(٨ျ 4.2A)LjtOFF ก߈ڱߔڊ෫ࣺăڶ ᅢ٨ျޠዷऔࠧᆐऔၭᇗLjዮؙᆚ־٫ૣཛྷ 3.7Aă ᇀྮ൩ன࿒LjMAX1515 ᇀ٫ݮ٫ૣف-3.2A ჾණቐ ԥಶڱߔڑቾಜăዮྮؙ൩٫ૣࣜوާ࿒ǖ ISINK _ MAX = ILIMIT _ N + VOUT t OFF − 2( VIN − VOUT ) t DLY 2L ණቲLjI SINK_MAX กዮྮؙ൩٫ૣLjI LIMIT_N ก٫ྮݮ ฏ٫ૣوණ ( ٨ျ -3.0A) Ljt DLY กૣ٫ଁבوพ႟ ֡Ljᆢཛྷ 500nsLjtOFF ก߈ڱߔڊ෫ࣺăڶᅢ٨ျޠዷ औࠧᆐऔၭᇗLjሦटդූ -2.5A وዮྮؙ൩٫ૣă ൫ಶڑ٫ૣቨ ൫ಶڑ٫ଁᇀಶࠧڑ༟ڱߔ־ன෫ኒԧ໗ෙԩૣ ٫ଁو٫ૣLjऩّષพ൩ਖ਼ᅇ٫ૣăेᇀᄧह SS ࠧ GND ቐࣺڊو෫٫൛ C SS ৹ਈቨԩ٫ૣوණෙ ଔăණ٫ࡍLjصಹऔ༥ႅຐ ( ڊ٨ျ 2.6V) ࢪᄧह SHDN ӇࡍݽLj 5μA ( ٨ျ ) ૣ࠽وᆚڶ൫ಶڑ ٫൛֬٫LjSS ᄧह٫ႅቐෙݽă صSS ණو٫ႅّᅢᆢ 0.7V ෫Lj٫ૣཛྷăص٫ႅᅑ 0.7V ෙݽባᆢ 1.8V ෫Lj٫ ૣᅑෙفݽૣ୭(Ըऑ Electrical Characteristics)ă ൫ಶڑ٫൛ණو٫ႅ෫ࣺӰࡧާو࿒ VSS = ISS(SRC) × t CSS ሦ I SS(SRC)ก Electrical Characteristics ቲو൫ಶڑᆚ־ ٫ૣă ؕفୄ٫ૣو෫ࣺ৹ᅑ࿒ࣜǖ t= CSS × 1.8V ISS(SRC) ൫ಶ֔߹ڑቲو٫ૣቨ൫ಶڑᄧह SS ණو٫ႅۚ ӰࡧLjऑ࿒ǖ V − 0.7V SSILIMIT = SS × ILIMIT _ P VREF ሦLjI LIMIT_P ก Electrical Characteristics ቲوቁဂૣ ୭ăქح൫ಶڑ٫൛ණو٫ႅؕ ف1.8V Lj࠽ૣᆚট ԥᆿޖ൫ಶڑ٫൛֬٫(ऑ༐ 3)ă ٻॎቁဂ٫ૣ MAX1515 ࠆૣ٫ଁLjट߹ NMOS وዮؙ٫ૣቨ ᇀ 4.2A ă෯࣠ᄮᅋቲ൲ླཏѿሦޔዮؙ٫ૣቨӰဏ ქဗLj৹ᇀ SS ࠧ GND ቐࣺेქޔ٫የ R SS ੂؕױف وă൫ಶڑૣ٫ଁو෫ࣺիืཛྷ RSS x CSSă ሦLjI LIMIT กຑၖوऋဏࡍوૣLjԸื I LIMIT_P ࠧ ISS(SRC)৹Ըऑ Electrical Characteristicsă 14 ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ SHDN 1.8V ޠዷன(MODE) 0.7V VSS (V) ILIMIT_P ILIMIT (A) ༐ 3. ൫ಶڑ٫ૣ MODE ᄧहᅋᅢහብ MAX1515 ཛྷ DDR ன (MODE = VCC)ࢪ ܇DDR ன (MODE = GND) ăာ౮ޠዷᇀ DDR ன෫Lj࣊ෳ SKIP ཛྷّ٫౿ ( Ըऑ ୀ֭ ( ᆚ־ன ) ࠧ ୀ֭ ( ྮ൩ன) ԩ ) ܖLj MAX1515 ྮ൩٫ૣă ༶LjDDR னࡱෳ REFOUT ࡲ֭ಹෳLj໗ ޥREFIN ٫ ႅ֭ࡲوพ־ăᇀ ܇DDR ன࿒Lj صSKIP ཛྷّ٫౿෫ MAX1515 ቝᆚ־٫ૣă ܇DDR ன࿒ REFOUT ࡲ֭ ಹӇߔڱă ଁڮ/ ߹ᆾү MAX1515 ৹֘ถ֞ၦ߹ࢪଁڮوᆾăᅢᆚ־னଁڮ ࢪ߹ᆾഉਦ෫Lj൲ VFB < 0.3 x VTARGETLjMAX1515 ߹ ႟լߔڱ෫ࣺੂਈቨ٫ૣă߹ࢪଁڮᆾ෫ာ౮ޠوዷ۽ ᅳቨ PWM ன੮Ljቝกߔڱ෫ࣺཛྷ 4 x tOFFăᇀ ୧ڱߔޔ෫ࣺॕา෫Ljݽӫ NMOS ߔـLjـኴຢ ქቓ֞ၦفพفݒࢎ־ቁիࢪ߹ߔو٫ૣؕفዮؙ ٫ૣăݽӫ NMOS ߔौቛࡍLjौቛኴຢ֞ၦӂو ᆊڱߔڊ෫ࣺ(t OFF)Ljّӫ NMOS ༀԧߔـăᅑᅢዜ ࢙ᅘქ ޔNMOS ߔᅢـኴຢLjຑჾ٫ݮණو٫ૣ กઘၦوăଁڮ෫LjRMS ٫ݮ٫ૣү֞ᇀዮؙૣ୭ ჾ࿒ăᇀ߹ࢪଁڮᆾ߆ሓӇׅೲ VFB > 0.3 x VTARGET ቐLjMAX1515 ࢙ქቓԳᅋሦቸ႟լߔڱ෫ࣺ۽وޠ ዷă߹ক߹ࢪଁڮوᆾ࢙ᄧಲെߔڱă ഓࠧӔृಹ ഓࠧӔृಹوพ൩กᅑൻࣩڂࠟဳޔᇀქಲ(و༐ 2)ǖพ ־٫ႅڶᅢࢱኼ٫ႅྥوဳࠟLjॿ߹ࢵوܖพ־٫ ႅྥቁဳࠟLjࣆݽӫ NMOS و٫ૣݮᄮဳࠟăࢵܖ ྥဳࠟᅑქޔਗؙ܅ـಹ߹ COMP وڭ༶े٫൛໗ ޥăܖࢵݡಹྐၖݽᇜᄐؙ܅ಹট৹໗ݽޥቓૣॽڪă ᇀ COMP ᄧहઘे٫൛৹ٻሿዜଁوᄮ(Ըऑࢵ܅ܖ ؙಹԩ)ܖă ࢵؙ܅ܖಹ MAX1515 ࠆქޔ৹໗ݽพ־ቓૣ٫ႅॽوڪਗ܅ـ ؙಹă ഁᆾޠዷ( SKIP) MAX1515 ৹ޠዷᇀୀ֭னLjჾऩّഁᆾ෫و٫ૣဋ ࠞăटာ౮ وSKIP ᅳ GND ઘ࣊৹टದහብཛྷୀ֭ன ăᇀቨ PWM ன࿒Ljߔ౷ଔڊ߈ڶLj৹ୄዣ் ဗეഓܸࠧـבව౷ଔቷү֞ᇀქृޔᇱو౷ڰو ᄮᅋوეഓăߔᅢࠨਈቨ٫(ൃݧEMI)ྲဳو৹ًଇ Maxim ཌሂǖwww.maxim-ic.com.cnăୀ֭னᇀഁᆾ ࿒ᅘڑຢӰࡧوߔ౷ଔLjคࠩᅢ்ဗეഓᇀഁᆾ࿒ ᅘݽပଔوᄮᅋă ቨ PWM ன ट MAX1515 وSKIP ᅳ V CC ઘ৹ෳာ౮६൩ّᇑĂ ߔڱ෫ࣺ࠽ وڊPWM னăሦቸ࠽ߔڱ෫ࣺ وPWM ࣲ࿒وߔ౷ଔ ( ڊ࠽ڶԸऑ พ־٫ૣӰࡧـቤو ౷ଔӰࡧ ԩ ) ܖăઉᅋޔة٫የ R TOFF හݽڊӫ NMOS ޢଔߔڱߔو෫ࣺLj৹ෳߔ౷ଔዮݽཛྷ 1MHzLjۚ ෳᅋᇀပଔĂพ־ߔᇑĂᆐऔ֧֑ࠧ؍ӊࣺ६ှ ౿࠼ă ቨ PWM னก߹႟լݽӫ NMOS ߔـو෫ࣺLj ۚᇜࣩ୧ޔቾಜבݘޖᆾوફLjؕٻفॎพ־٫ ႅووăᇀ୧ქڱߔ״෫ࣺॕา෫Ljݽӫ NMOS ߔ ـ࢙ڞLjԌქቓү֞ـኴຢቓفพ־ቁիࢪ߹ ߔو٫ૣؕ ف4.2A (ૣ)෫ཛྷቛăݽӫ NMOS ߔߔ ڱ෫Ljᇀහڱߔوࠝڊ෫ࣺ (t OFF ) ດү֞ߔڱኴຢLj ༀ෫ّӫ NMOS ߔـăّӫ NMOS ߔཞ֞ـኴ ຢቓ فt OFF ॕาăᅑᅢᇀ PWM ன࿒Ljዜ࢙ᅘქޔ NMOS ߔـLjຑჾ٫ݮණو٫ૣกઘၦوă ______________________________________________________________________________________ www.BDTIC.com/maxim 15 MAX1515 ᇀ COMP ڭᅳ VCC ቐࣺ༶ेქޔ٫൛ C COMP ৹ჾڶਗـ ؙ܅ಹ६ှԣխă৬ڊེف၂Lj৹ၭᇗ 470pF و٫൛ă MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ӹ 3. ޠዷன SHDN MODE PIN SKIP REFOUT BUFFER STEP-DOWN REGULATOR MODE STEP-DOWN REGULATOR CURRENT Low Low X Off, High-Z Off Off Low High X On Off Off High Low Low Off, High-Z On, non-DDR mode. FB regulates to preset voltage or 0.5V. Source only. Pulse-skipping mode. High Low High Off, High-Z On, non-DDR mode. FB regulates to preset voltage or 0.5V. Source/sink. Forced-PWM mode. High High Low On On, DDR mode. FB regulates to REFIN. Source/sink. Pulse-skipping mode. High High High On On, DDR mode. FB regulates to REFIN. Source/sink. Forced-PWM mode. X = ྐߔă ୀ֭(ᆚ־ன ) ઘे SKIP فGND ৹ᆰၛ MAX1515 ዔڑᇀቸனࣺ ࡳLjഁᆾ෫ޠዷᇀݽပଔوୀ֭னLjቺᆾ࿒ࡳف PWM னăݘصᆾ٫ૣؕفୀ֭ன୭٫ૣ ( ٨ျ 800mA)وქҙ෫Ljာ౮ट࢙ PWM னዔڑࡳف ୀ֭னă MAX1515 ޠዷᇀୀ֭ன෫Ljཛྷષ໗ݽပଔLjߔ౷ ଔ࢙ᅘຑऩّăୀ֭ன࿒٫ݮ٫ૣกڱၦوLjቝᅘ صVFB < VREFIN ෫Ljာ౮ԯ࢙ಶڑქ ޔLX ߔቾಜăص VFB < VREFIN ෫Ljݽӫ NMOS ߔـLjԌཞ֞ـኴ ຢቓفพڊེݒࢎ־ೲߔ٫ૣෙ فݽ800mA وቁဂ ୀ֭ன٫ૣ୭(ISKIP_P = 800mA)ăݽصӫ NMOS ߔߔӡ෫Ljّӫ NMOS ༀԧߔـLjԌү֞ـኴຢ ቓفߔ٫ૣऩባ 200mA ߹و٫ૣ୭ă ୀ֭( ྮ൩ன ) صMAX1515 ᇀ DDR ன(MODE = VCC )࿒ၭᇗୀ֭ޠ ዷன෫(SKIP = GND)LjMAX1515 وᆚ ־/ ྮ൩ਈቨಹ ᇀพ־٫ႅਗᆣޔᆚ ־/ ྮ൩ቯ୭(VREFIN ±25mV) ෫ࡳޠዷனăᇀୀ֭ᆚ־னቲLjMAX1515 ڶพ ླྀ־Ԓ٫ႅ߄و६ှٻॎ(Ըऑ ୀ֭ ( ᆚ־ன ) ԩ )ܖăصพ־٫ႅෙྮفݽ൩ன୭ჾණ෫LjMAX1515 ६൩ྮ൩னăMAX1515 ᇀྮ൩னو୧ޔቾಜ෫ ّӫ NMOSăّӫ NMOS ཞ֞ـኴຢቓߔؕفف ڱ෫ࣺ (t OFF ) ăّӫ NMOS ߔࡍڱLjݽӫ NMOS ـԌ 16 ӹ 4. พ־٫ႅහብ FBSEL0 FBSEL1 OUTPUT VOLTAGE GND GND Adjustable VFB = VREFIN GND VCC 1.5V VCC GND 1.8V VCC VCC 2.5V ཞ֞ـኴຢቓ߹ૣفߔو٫ૣؕ߹ف٫ૣ୭ (-350mA)ăቝეพ־٫ႅّᅢ۴ਯ୭Ljਈቨಹট࢙ქ ቓᅢݽየຢăഁᆾऔ࿒Ljሦ࢙ෳྮฏனਈቨಹዔ ڑ߹ქဗୀ֭ăᇀቺᆾ෫Ljพ־٫ႅቷݽᅢ۴ਯ୭ Ljಊෳྮฏனਈቨಹޠዷᅢ੮ቨ PWM وனă ୀ֭٫ૣ୭৹ෳྮ൩னਈቨ٫ଁዔڑٜᇀୀ֭ PFM ࠧ܇ୀ֭ وPWM ቐࣺࡳăሦቸࢲቨಊෳ٫ݮ ٫ૣوઘၦࠧ܇ઘၦޠዷனቐࣺܖوज़٧ᅢݘဂ ୀ֭٫ૣ୭وქҙă ܇DDR னوพ־٫ႅ ာ౮ޠዷᇀ ܇DDR ன (MODE = GNDLjVREFIN = VREF) ෫Ljದพ־৹ჾᆊහཛྷ 2.5VĂ1.8VĂ1.5V ቲوქቸăट FB ᄧहᅳพ־٫ႅઘLjԌ߹ FBSEL0 ࠧ FBSEL1 و ԥༀහብੂၭᇗพ־٫ႅLjහብ۽ऑӹ 4ă൲ეพ ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ LOAD CURRENT 0 -2A 0 INDUCTOR CURRENT ⎛ ⎞ RB VFB = VREF ⎜ ⎟ R + R ⎝ A B⎠ -2A ቲLjVREF = 1.1Vă OUTPUT VOLTAGE REFIN ᅳ REF ڭઘ෫Ljာ౮ԩॿ߹པوٻ٫የܖႅ ཌटพ־٫ႅහڊཛྷคჵو٫౿ăᇀᆊብ٫ႅன ࿒Lj൲ REFIN ڭᅳದດ٫౿ઘLjพ־٫ႅटѢӔઋ Ӱࡧă LX VOLTAGE DDR னوพ־٫ႅ ᇀ DDR ன෫(MODE = VCC)LjMAX1515 ट FB ٻॎف REFIN හوڊ٫ႅăᅋᅢ DDR ෫Ljቷڭ٫ᆚӤၙॽവޘ ዙ،ಹ٫ᆚ٫ႅوქҙă༐ 1 ־ޖષ MAX1515 ᇀᄮᅋ ᅢ DDR ෫ైوብă VIN ٫ᆚটၥพ(־PGOOD) PGOOD กქޔઘၦࣶญพ־٫ႅזوਊӔृಹوพ ־ăߔࠧڱ൫ಶڑ෫ PGOOD ཛྷّ٫౿ă൫ಶڑॕาࡍLj ቝეพ־٫ႅᇀڊې٫ႅ ±10% ۶ཙLjPGOOD ࣊ཛྷݽ የຢăصพ־٫ႅ࿒ऩࢪණෙմ߹ቁի٫ႅ و10% ෫Lj ာ౮े MOSFETLjෳ PGOOD ّ(ऑ༐ 2)ăᇀ PGOOD ᅳ V CC ቐࣺઘेქ༶ԩණ٫የ৹ჾพ־ࣃ٫౿و ٫ႅăիLj100kΩ و٫የ࣊৹ୄዣืۂؙᄮᅋوၖეă െߔڱ ာ౮ࠆქޔെ߆ሓү٫ଁăصॕུݽᅢ +165°C ෫Lj ྐଥ V SHDN ٫ႅࠨLjུݮבڪಹো࢙ߔڱာ౮ăصॕ ུऩባ +150°C ෫Ljာ౮۽৹ࢎޠݒዷă VOUT GND tOFF ༐ 4. ྮ൩னوԒြ༐ L LX REF MAX1515 RA REFIN ࢱኼࡲ֭ಹ(REFOUT) MODE = VCC ෫Ljာ౮ԩةوᇜᄐؙ܅ಹوพ־ཛྷ Ը৬พ൩٫ႅ(VREFIN )ࡲ֭ࡍوพ־Ljሦޔਗؙ܅ـಹӤ ၙᅋԥဏᅢ 0.47μF ׯ໋و٫൛ੂ६ှԣխLjوؙޚ٫൛ ࢙ऋဏؙ܅ಹ؞وਝLj६ۚ႟լพ൩٫ႅӰࡧ෫ڑوຢ ᄮ෫ࣺă࣊ෳᇀࣩᆾ ±5mA وഉਦ࿒Lj֭ࡲݡಹ৹ ෳڑຢࢱኼพ־ү֞ᇀพ൩٫ႅ(VREFIN ) و±20mV ۶ཙ ăؙ܅ಹوพ־٫ႅ۶ཙཛྷ 0.5V ባ 1.5V ă MODE = GND ෫ࢱኼࡲ֭ಹߔӡă VREFIN RB VOUT COUT PGND GND FB MODE FBSEL0 FBSEL1 ༐ 5. ߹ REFIN ڭ٫የܖႅಹහ ڊVOUT െየ ॕفঅെየ θ JA ᇀ࠶ڪؙ֔ණടৈᅢᅳҿԩଭࠒర ઘेو༁ԗஎࢵăૣ߹٫ଁғૣو৹ؙؙऩّ θ JA ă ཛྷષؕوࠝޚفൾെပ߷Ljোᆮైܖઘे فIC ݽ٫ૣᄧ हණܳو༁எࢵăᅘߔ QFN ܢኰوൾെ৬Lj৹Ը৬ Maxim ཌሂǖwww.maxim-ic.com.cnă ࠞޢ MAX1515 ࠞޢوኙეੂዔᅢޔԩޢଔߔـבوຈ ࠞăਈቨԩوܖ٫ᆚ٫ૣࠧԩߔᇨࣁ֬Ă܅٫ຑၖ و౿ো٫ૣդූ࣊(ࠞޢوߔຈࠞ —PSL)॰ཛྷǖ PSL = C x VIN2 x fSW ______________________________________________________________________________________ www.BDTIC.com/maxim 17 MAX1515 ־৹وٻ٫ႅLj৹ट FBSEL0 ࠧ FBSEL1 ઘባ GNDLjԌट REFIN ڭᅳ REF ٜࠧቐࣺو٫የܖႅಹे ( ༐ 5) ăص VFB = VREFIN ෫Lj৹ٻพ־٫ႅؕڊེفăRB ട 100kΩLj RA ᅑ࿒־ޖǖ MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ MAXIMUM RECOMMENDED OPERATING FREQUENCY vs. INPUT VOLTAGE 1000 VOUT = 1.8V FREQUENCY (kHz) 800 600 400 VOUT = 1.5V VOUT = 1.25V VOUT = 0.9V VOUT = 2.5V 200 NO LOAD 0 1.5 2.0 2.5 3.0 3.5 ӹ 5. ༚ऌوᆐऔ(IOUT = 3A) VOUT (V) VIN (V) fPWM (kHz) L (μH) COUT (μF) RTOFF (kΩ) 3.3 2.5 400 1.5 100 49.9 3.3 1.8 400 2.2 150 110 3.3 1.5 480 2.2 180 110 3.3 1.2 420 2.2 220 150 2.5 1.8 430 1.2 100 49.9 2.5 1.5 320 1.8 150 110 2.5 1.2 440 1.5 180 110 PWM ன࿒ݽӫ NMOS ޢଔߔڱߔو෫ࣺăცযਅᆾ ෫ຑၖوߔ౷ଔLj৹ᅑ࿒ࣜ־ದߔڱ෫ࣺǖ VIN (V) t OFF = ༐ 6. ዮޠؙዷ౷ଔᅳพ൩٫ႅߔو࿅༐ ದቲLj ದቲǖ C = 5nF t OFF = හڱߔوڊ෫ࣺ fSW ཛྷߔ౷ଔ VIN = พ൩٫ႅ ޢޔଔߔߘوዛࠩـבຈࠞ(PCL)ᆢཛྷǖ PCL = IOUT2 x RNMOS VOUT = พ־٫ႅ ದቲǖ RTOFF ࣜوާ࿒ǖ VIN − VOUT fPWM × VIN fPWM = ਅᆾߔ౷ଔLjPWM ன IOUT = ݘᆾ٫ૣ RTOFF = (t OFF − 0.035μs) RNMOS = NMOS ـو٫የ ____________________________ හࣜԧኊ صᄮᅋᅢಗ وDDR դ౹෫Lj৹Գᅋӹ 1 ຑ༚ऌوᆐऔ Ljᅋᅢದດդ౹෫Lj༚ऌෳᅋوᆐऔ৹Ըऑӹ 5 Lj ნ৹Գᅋ࿒எوԧኊੂහࣜǖ 1) හڊຑၖ وPWM னوߔ౷ଔăዮޠؙዷ౷ଔԸ ऑ༐ 6ă 2) ޗযეഓوพ൩٫ႅĂพ־٫ႅࠧߔ౷ଔੂහ࠽ڊ ڱߔڊ෫ࣺă ದቲ VRTOFF իཛྷ 1.1VLjߔڱ෫ࣺཛྷ 0.35μs ባ 4.5μs ෫ ༚ऌ وRTOFF ཛྷ 33.2kΩ ባ 499kΩă พ־٫ૣӰࡧـቤو౷ଔӰࡧ PWM ன࿒ MAX1515 ޠوዷ౷ଔኙეടৈᅢ t OFF ( ᅑ RTOFF ੂහ)ڊĂVIN ࠧ VOUTLjߔ࿅ऑ࿒ǖ fPWM = 3) ޗযߔڱ෫ࣺੂහ ڊRTOFFă 4) ޗযพ־٫ႅĂߔڱ෫ࣺĂ٫ݮ٫ૣܥ-ܥੂၭᇗ ٫ݮă හڊਅᆾߔ౷ଔ ࠧߔڱ෫ࣺ MAX1515 ৹ჾޠዷᇀ PWM னLjױ෫وߔ౷ଔടৈ ᅢพ൩٫ႅĂพ־٫ႅࠧ R TOFF وă R TOFF ᅋੂහብ 18 110kΩ 1.00μs VIN − VOUT − VCHG t OFF ( VIN − VCHG + VDISCHG ) ದቲǖ VCHG = ᅑݽӫ FET RNMOS ࠧ٫ ݮDCR ᄧ൩و٫֬ݮ٫ ଁ٫ႅऩ VDISCHG = ᅑّӫ FET RNMOS ࠧ٫ ݮDCR ᄧ൩و٫܅ݮ ٫ଁ٫ႅऩ ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ΔfPWM = − ൛Ljᅋੂକׅᇑăޗয RMS พ൩ླྀԒ٫ૣࠧڊې٫ႅ ეഓၭᇗ؍ؙ֧พ൩٫൛ǖ ⎛ V ⎞ OUT (VIN − VOUT ) IRMS = IOUT(MAX) ⎜ ⎟ ⎜ ⎟ VIN ⎝ ⎠ IOUT × RDROP พ־٫൛ၭᇗ VIN × t OFF ቲLjRDROP กԩ MOSFET (40mΩLj٨ျ)ࠧ٫وݮ ٫የă พ־କԒ٫൛ᄸพ־٫ႅླྀԒĂพݘ־ᆾ๊ຢᄮࣆ۴ ਯଁڊེو၂ă৬ޠفዷེڊ၂وეഓLjMAX1515 وዮဏพླྀ־Ԓ٫ႅᄮୄዣ VRIPPLE ≥ 1% x VOUTăพ־ ٫൛وዮဏ ESR ࣜ࿒ǖ ٫ݮၭᇗ ၭᇗ٫ݮ෫ၖ৬ߔوऒԸืᅘǖ٫ݮ(L)ࠧܥ٫ૣ (IPEAK)ă࿒ቲوիફ LIR ก٫ݮयૣླྀԒ٫ૣܥܥ ᅳዮؙቓૣݘᆾ٫ૣوӔă صLIR ृؙ෫৹ෳ٫ृݮ ဏLjدༀ෫ნ࢙وݽृੂ؞ຈࠞࠧླྀԒăटླྀԒ٫ૣᅳ ݘᆾ٫ૣቐӔڊཛྷ 25% (LIR = 0.25)ዳᅚ৹ࢩࠧ؍֧هຈ ࠞӔृࠝو౿࠼Ljڶᄮو٫ܥݮ٫ૣกቓૣݘᆾ٫ૣ و1.125 ӂǖ L= VOUT × t OFF IOUT(MAX) × LIR ༶Lj٫وݮዮဏԥມဏLjӤၙүቆݽӫߔ ـ෫٫ݮ٫ૣوతෙଔّᅢ 1A/μsă LMIN ≥ ( ) 1μs VIN(MAX) − VOUT × 1A ߷ Գ ᅋ ණ Lj ୄ ᆾ ෫ ٫ ݮ٫ ૣ ܥ و ཛྷ 1.125 x I OUT(MAX)LjܱᇘLjܥ٫ૣ৹ࣜ࿒ǖ V × t OFF IPEAK = IOUT(MAX) + OUT 2 × L ၭᇗ٫ݮ෫Ljᄮၭᇗ்ဗұࠧ٫ૣԥّᅢ٫ݮ٫ૣܥ Ljۚೲᇀၭޠوڊዷ౷ଔ࿒وّृࠞޢ٫ݮă พ൩٫൛ၭᇗ พ൩କԒ٫൛৹ჾऩّᆚܥوڭ٫ૣࠧᇑăᇀল ᄧह IN ԥ ف5mm وٜे۽ქ 0.1μF ّوESR ّࠧ ESL ٫ ESR ≥ 1% × L t OFF ४४ၖეᆚ־٫ૣوᄮᅋቲLjეེޠڊዷნၖეၭ ᇗคوصพ־କԒ٫൛ăຑၭوพ־କԒ٫൛ᄮୄዣ ࿒ǖ ᇀ DDR ᄮᅋቲLjพ־କԒ٫൛ؙوဏᄮടණะާࣜ و־٫൛وӂăพ־କԒ٫൛ٌوပהખ٫የ(ESR) ӤၙዣّLjჾୄዣพླྀ־Ԓࠧݘᆾ๊ຢᄮეഓLj৬ ڊེف၂ეഓLjESR ࡱԥມّă صพ־ණݘوᆾӰࡧ࠶ؙ෫Ljพ־٫൛وടኙეടৈ ᅢຑၖ ESR ؙوဏLj٫൛ وESR Ӥၙүቆݘᆾ๊Ӱ ෫พ־٫ႅԥ࢙Ӈّ߹وăࡐଞᅘ٫൛ᄧಲو٫ႅ ټମǖ RESR ≤ VSTEP ΔIOUT(MAX) ݘصᆾ๊Ӱԥ࠶ؙნԥ࠶ਜ෫Ljพ־٫൛وիნട ৈᅢၖე وؙۂESR ੂفهୄዣეഓوพ־٫ႅླྀԒๆ ౿ăऩႅਈቨಹوพླྀ־Ԓ٫ႅٌᅢพ־٫൛ وESR ᅳ ዜو٫ླྀݮԒ٫ૣቐࢵăᄜױLjୄዣླྀԒეഓ وESR و ዮؙཛྷǖ RESR ≤ VRIPPLE IOUT(MAX) LIR ______________________________________________________________________________________ www.BDTIC.com/maxim 19 MAX1515 ᆚ־٫ૣ෫LjVCHG ࠧ VDISCHG ࢙ᆚݘ־ᆾ٫ૣوᇜࣩ ۚᇜࣩLjෳ٫ݮڭ٫ႅऩّăሦ࢙ෳ౷ଔ࿒ऩă ۴Ljྮ൩٫ૣ෫LjVCHG ࠧ VDISCHG ዅྮ൩ݘᆾ٫ૣۚ ऩّLj٫ݮ٫ႅᇜࣩăޗয࿒৹ࣜ౷ଔوӰࡧફǖ MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ෯࣠ຑၖو٫൛ફؙوဏᅳୄዣّ ESR ეഓو٫൛ྡو ֧؍ᅘߔLjნࠧ٫൛ಹࡧوၳॕᅘߔăᄜױLjի ᇀၭᇗ٫൛ಹ෫ცযوก ESR ࠧڊې٫ႅLjۚԥก൛ફ ؙဏ (ݡᆓᇘᇀၭᅋ᭕٫൛ĂOS-CON Ăভࠩ٫൛ࣆದ ດ٫ॖ٫൛෫োคᅋ)ă ๊ຢᄮ ٫ླྀوݮԒ٫ૣༀჅნ࢙ڶ࿅༇๊وຢᄮ၂ᇒ֑ᄸ Ljᇀ VIN - VOUT ࠶ّ෫ᅐཛྷױă٫ݮृّ෫Lj٫ ݮ٫ૣӰࡧট৹ჾޚਜဗLjሦჅݘصᆾ༏ഹӰࡧ෫ট৹ ڶพ־କԒ٫൛ණຈو٫ࠣ६ှԣ֬ăዮഉਦ࿒พ ־٫ႅ࿒ऩࣜوާ࿒ǖ VSAG ≈ (ΔIOUTL + VOUT t OFF )2 2L × COUT ( VIN − VOUT ) ΔI t + OUT OFF COUT + VOUT t OFF2 2L × COUT ቲ وΔIOUT กዮݘؙᆾ๊Ӱă իഉਦ࿒Ljዮݘؙᆾ๊Ӱٌᅢዮݘؙᆾ٫ૣ (ΔI OUT = ILOAD(MAX))ăصᅋዶ DDR ቷڭ෫Ljದพڭ־Ӥၙᆚ ྮࠧ־൩٫ૣLjሦቸഉਦ࿒Lj෯࣠ܥوlj๊ܥӰ٫ૣ (ΔIOUT) กዮؙᆚ־٫ૣᅳዮྮؙ൩٫ૣቐࠧǖ ΔIOUT = ISOURCE(MAX) + ISINK (MAX) ᅑᅢ٫ݮLjୄᆾفਅᆾ๊Ӱ߹֔ቲᄧಲو٫ႅ߹֭ ৹ࣜ࿒ǖ (ΔIOUT )2 L VSOAR ≈ 2COUT VOUT ڱߔصಜࣺ٫ݮ٫ૣو࿒ऩફ(ΔIDOWN)ٌᅢـಜࣺوණ ෙફ (ΔIUP)෫Ljႅّࣁف٧ăӔଔ h = ΔIUP /ΔIDOWN ؠӹਈቨಹᇀݘᆾᇜؙ෫໗ݽ٫ݮ٫ૣوLjດӤၙ ؙᅢ 1 ă صh े॰ 1 Lj࣊ႅّࣁفLj୧ޔߔቾಜ و٫ݮ٫ૣᆿნྐۨᇜࣩLjVSAG ؙؙ࢙ᇜࣩLj܇ׅෳᅋ وۂޚพ־٫൛ă ࠩ وh ዮဏᄮཛྷ 1.5Ljᇀׇࢱױණ ڶh ६ှٻሿট৹ ᇀ VSAGĂพ־٫൛ࠧዮဏޠዷ٫ႅࣺ६ှሟቶ౿࠼Ljჾട هዮࣧပ߷ăh ქڊ෫Ljዮဏޠዷ٫ႅ৹ᅑ࿒ࣜ־ǖ VIN(MIN) = VOUT + VCHG + h × t OFF × (VOUT + VDISCHG ) t ON(MAX) ቲLj V CHG ࠧ V DISCHG ก֬Ă܅٫ଁܖوԦ٫ႅऩ ( Ըऑ พ־٫ૣӰࡧـቤو౷ଔӰࡧ ԩ ) ܖă t ON(MAX) ऑ Electrical Characteristics ԩܖLjtOFF กහڱߔوڊ෫ࣺă h = 1 ৹ࣜ־พ൩٫ႅࣁوဏă ߷ࣜ وੂ־VIN(MIN)ؙᅢຑၖوዮဏพ൩٫ႅLjე ࢩهୄᄌ وVSAGLjӤၙऋඵ tOFF ࢪᇜࣩพ־٫൛ă߷ ᆊಜ࢙ᇀّႅݛ॰ޠዷLjᇘࣜ وੂ־VSAG Ӥၙവү ୄዣ๊ຢᄮეഓă ႅහࣜফઋǖ VOUT = 2.5V tOFF = 1μs VCHG = VDISCHG = 100mV h = 1.5 صԳᅋୀ֭ᆚ־/ྮ൩ޢ෫(MODE = VCCLjೲ SKIP = GND)Ljพ๊־ຢ٫ႅԥᄮմ߹ࢪّᅢྮ൩ࠧᆚܖ(־Ӽ) ंՌ୭(VREFIN ±20mV)ă _______________________________________ ᄮᅋဳྲ ّႅޠዷ MAX1515 وዮـؙ෫ࣺཛྷ 10μsLjݢජષّႅޠዷ၂ ăصာ౮وพ൩٫ႅृّ෫LjӤၙޗযዮഉਦ࿒و 20 ـࠧߔڱ෫ࣺࣜࣁሀਅӔăӤၙੜࣝLjႅ߹ّ وऩႅٻॎಹ๊وຢᄮ၂࠶LjӤၙԳᅋؙ൛ફพ־ ٫൛ੂ६ှԣխ(Ըऑහࣜԧኊԩܖቲ VSAG ࣜوާ)ă VIN(MIN) = 2.5V + 0.1V + 1.5 × 1μs × (2.5V + 0.1V) 10μs = 2.99V พ־٫ႅڑوຢӰࡧ ߹ݢӰ REFIN وڭ٫ႅLj৹ෳ MAX1515 ᄮᅋᅢეഓพ ־٫ႅᇀ٧ቐࣺڑຢӰࡧوդ౹ቲă߹ٻॎ REFIN ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ SKIP L LX REF MAX1515 R1 CREFIN COUT PGND REFIN R2 FB VOUT GND MODE FBSEL0 REFIN ᅳ GND ࣺᇜࣩ٫൛ࡍLjREFIN ٫ႅᇀޔහብ٧ ቐࣺӰࡧو෫ࣺիืཛྷ REQ X CREFINLjದቲ REQ กݡ٫ ൛ٌوပԌખ٫የă༐ 7 ຑLjREFIN ٫ႅቁဂӰࡧ ෫و෫ࣺիืཛྷǖ ⎡ R1 × (R2 + R3) ⎤ τPOS = ⎢ ⎥CREFIN ⎣ R1 + R2 + R3 ⎦ REFIN ٫ႅݘဂӰࡧ෫و෫ࣺիืཛྷǖ FBSEL1 VOUT(LOW) VOUT(HIGH) R3 ⎡ R1 × R2 ⎤ τPOS = ⎢ ⎥CREFIN ⎣ R1 + R2 ⎦ ༐ 7. ڑຢพ־٫ႅ وڭ٫የܖႅಹLjᅋქ ޔn لޱMOSFET ট৹ڶٞ۠ޔ ਈቨಹพ־٫ႅ६ှڑຢٻॎăದพ־٫ႅ৹ᅑ࿒ࣜǖ ⎛ R2 ⎞ VOUT(LOW) = VREF ⎜ ⎟ ⎝ R1 + R2 ⎠ ⎛ R2 + R3 ⎞ VOUT(HIGH) = VREF ⎜ ⎟ ⎝ R1 + R2 + R3 ⎠ صREFIN وڭ٫ႅ࿒ऩ෫LjეഓԳᅋቨ PWM னޠ ዷLjۚүቆਜĂኼവݘوဂ٫ႅӰࡧăᅑᅢቨ PWM னߔӡ߹ӔृಹLj٫ݮ٫ૣ৹ჾᇀഁᆾ෫۴ ဂLjۚڶพ־٫൛६ှਜ܅٫ă صREFIN ڭ٫ႅۢූᆤӰ෫Ljದพ־٫ႅوӰࡧଔถ ᅢ٫ݮ٫ૣوӰࡧڪĂዜพ־٫൛Ăૣࣆ๊Ӱ ಜࣺݘوᆾă٫ݮ٫ૣوӰࡧଔถᅢ٫ݮوڭ٫ႅ ࠧ٫ݮăዜพ־٫൛ৈڊષݢӰพ־٫ႅၖეوؙۂ ٫ૣă REFIN ٫ႅቁဂӰࡧ෫Ljݘوࣩݛᆾ٫ૣ࢙ऩّ พ־٫ႅوӰࡧଔLjۚ صREFIN ٫ႅݘဂӰࡧ෫Ljݘ ᆾ٫ૣᇘ࢙ࣩพ־٫ႅوӰࡧଔă໗ݽૣ୭ ৹ჾࣩਜพ־٫ႅوቁဂӰࡧă ཛྷષӨஊۢ٫ᆚটၥӔृಹLjࢱኼ٫ႅوӰࡧଔӤ ၙዣେLjෳพ־٫ႅ ( V OUT ) ኼവޘዙࢱኼ٫ႅ (VREFIN )ăᇀ REFIN ᅳ GND ࣺेქ٫൛৹ਈቨ REFIN ٫ ႅوӰࡧڪLjԌକׅᇑă PCB Ԧনኼᇘ ეؕفຑၖوพޢ־ଔĂݽပଔّࠧᇑቚӶLjၖე ڶ٫ଁғ६ှॽဲԦনăქوࠝޔ٫ଁғԦনᄮዶفǖ Գᅋከ୭وٜ౿எĂᆐऔ҈܅৬ĂࠩوዟĂคص وਝă৹Ը৬ MAX1515 ಂғو٫ଁғԦন༐ă ჾ࿒ე٧ცቺე၂١ऋ๋وၠ־ޖǖ 1) ᄮහۨटߔ٫ૣؙࠧ٫ૣेوٜଁऋባዮဏăة ٧ઘेพ൩٫൛ٜĂพ־٫൛ٜᅳ PGNDLjြ֑وٜ ؾᅳ GND ة٧ઘेă 2) พ൩କԒ٫൛ᅳ IN وڭলԥᄮմ߹ 5mm ăઘे ᆾᅘؙ٫ૣLjਝԥهဏᅢ 1mmLjᅍၭ 2.5mmă 3) ᅳ LX ॎ٧ઘेوᆐऔӗױቐࣺᄮॳફ৯॰Ljༀ෫ნ ეॳ৹৯॰ಹऔ܅ብLjሦჅ৹ჾऩّᇑĂየ၂ຈ ࠞࠧߔຈࠞă 4) ქޔከ୭وٜ౿எڶ၂وᅍࡧ܇իቺეăᇀืۂؙ ᄮᅋቲLj٫ଁᅢქۂޔՍғණLjजᄓ֬ܖઉᅋޔ ࢪوۂޚՍஎăڇՍࠧٛՍᅋᅢԦLjቲࣺกୣᅘڱ ઽوٜ౿எăᄮӨஊوؙयૣ٫ૣ߹ٜ౿எă ____________________________ ာ౮ဳྲ TRANSISTOR COUNT: 8258 PROCESS: BiCMOS ______________________________________________________________________________________ www.BDTIC.com/maxim 21 MAX1515 VCC FBSEL0 MODE SHDN REFIN REF TOP VIEW FBSEL1 ____________________________ ᄧहైብ 18 17 16 15 14 13 SKIP 19 12 GND BST 20 11 VCC LX 21 10 COMP 9 FB 8 TOFF 7 PGOOD MAX1515 LX 22 IN 23 1 2 3 4 5 6 IC VDD REFOUT SS + PGND IN 24 PGND MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ THIN QFN (4mm x 4mm) 22 ______________________________________________________________________________________ www.BDTIC.com/maxim ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ 24L QFN THIN.EPS PACKAGEOUTLINE, 12,16,20,24,28LTHINQFN,4x4x0.8mm 21-0139 E 1 2 ______________________________________________________________________________________ www.BDTIC.com/maxim 23 MAX1515 ``````````````````````````````````````````````````````````````````````````````ॖᓤቧᇦ (۾ၫᓾ೯ᄋࡼॖᓤᅄభถဵݙᔢதࡼਖৃLjྙኊᔢதࡼॖᓤᅪቯቧᇦLj༿އኯ www.maxim-ic.com.cn/packagesă) MAX1515 ّ٫ႅĂብߔߘĂ ऩႅျ DDR ٻॎಹ ```````````````````````````````````````````````````````````````````````````ॖᓤቧᇦ)ኚ * (۾ၫᓾ೯ᄋࡼॖᓤᅄభถဵݙᔢதࡼਖৃLjྙኊᔢதࡼॖᓤᅪቯቧᇦLj༿އኯ www.maxim-ic.com.cn/packagesă) PACKAGEOUTLINE, 12,16,20,24,28LTHINQFN,4x4x0.8mm 21-0139 E 2 2 NBYJN ۱யࠀူێ ۱ய 9439 ቧረ ᎆᑶܠ൩ 211194 ॅ࢟જǖ911!921!1421 ࢟જǖ121.7322 62:: ࠅᑞǖ121.7322 63:: Nbyjn ࣪ݙNbyjn ޘອጲᅪࡼྀੜ࢟വဧঌᐊLjጐݙᄋᓜಽభăNbyjn ۣഔᏴྀੜဟମĂᎌྀੜᄰۨࡼ༄ᄋሆኀখޘອᓾ೯ਜ਼ਖৃࡼཚಽă 24 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2006 Maxim Integrated Products Printed USA ဵ Nbyjn!Joufhsbufe!Qspevdut-!Jod/ ࡼᓖݿܪă www.BDTIC.com/maxim