MAX44264 Ultra-Low Power Op Amp in a Tiny 6-Bump WLP General Description

19-5708; Rev 0; 12/10
KIT
ATION
EVALU
E
L
B
A
IL
AVA
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
The MAX44264 is an ultra-small (6-bump WLP) op amp
that draws only 750nA of supply current. It operates
from a single +1.8V to +5.5V supply and features
ground-sensing inputs and rail-to-rail output. The ultralow supply current, low-operating voltage, and rail-torail output capabilities make these operational
amplifiers ideal for use in single lithium ion (Li+), or twocell NiCd or alkaline battery systems. The rail-to-rail output stage of the MAX44264 is capable of driving the
output voltage to within 4mV of the rail with a 100kΩ
load, and can sink and source 11mA with a +5V supply. The IC is unity-gain stable and available in a
space-saving 0.9mm x 1.3mm, 6-bump WLP package.
Applications
Cell Phones
Features
o
o
o
o
o
o
o
Ultra-Low 750nA Supply Current per Amplifier
Ultra-Low +1.8V Supply Voltage Operation
Ground-Sensing Input Common-Mode Range
Outputs Swing Rail-to-Rail
Outputs Source and Sink 11mA of Load Current
No Phase Reversal for Overdriven Inputs
High 120dB Open-Loop Voltage Gain
o Low 500µV Input Offset Voltage
o 9kHz Gain-Bandwidth Product
o 250pF (min) Capacitive Load Capability
o Available in a Tiny, 0.9mm x 1.3mm, 6-Bump WLP
Package
Ordering Information
Tablet/Notebook Computers
Mobile Accessories
PART
TEMP RANGE
PINPACKAGE
TOP
MARK
MAX44264EWT+
-40°C to +85°C
6 WLP
+CB
Battery-Powered Devices
+Denotes a lead(Pb)-free/RoHS-compliant package.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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1
MAX44264
General Description
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
ABSOLUTE MAXIMUM RATINGS
VDD to VSS ...............................................................-0.3V to +6V
IN_+ or IN_-......................................(VSS - 0.3V) to (VDD + 0.3V)
OUT_ Shorted to VSS or VDD ......................................Continuous
Continuous Power Dissipation (TA = +70°C)
6-Bump WLP (derate 10.5mW/°C above +70°C) .............840mW
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
Soldering Temperature (reflow) ......................................+260°C
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
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ to VDD/2, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Supply Voltage Range
VDD
Supply Current (per
Amplifier)
IDD
Input Offset Voltage
VOS
CONDITIONS
Guaranteed by PSRR tests
MIN
TYP
UNITS
5.5
V
VDD = +1.8V
0.6
VDD = +5.0V
0.75
1.2
±0.5
±7.0
mV
±1500
pA
IB
±200
Input Offset Current
IOS
±12.5
Input Common-Mode
Voltage Range
VCM
Input Bias Current
MAX
1.8
Guaranteed by the CMRR test
VSS
µA
pA
VDD 1.1
V
Common-Mode Rejection
Ratio
CMRR
Specified with VSS ≤ VCM ≤ (VDD - 1.1V)
70
95
dB
Power-Supply Rejection
Ratio
PSRR
+1.8V ≤ VDD ≤ +5.5V
70
90
dB
RL = 1MΩ, VOUT = 50mV to VDD - 50mV
90
120
Large-Signal Voltage Gain
AVOL
RL = 100kΩ, VOUT = 200mV to VDD - 200mV
90
112
VOH
RL = 10kΩ, VOUT = 200mV to VDD - 200mV
100
Swing high
specified as
VDD - VOH
RL = 1MΩ
1
4
RL = 100kΩ
4
10
RL = 10kΩ
40
Swing low
specified as
VOL - VSS
RL = 1MΩ
0.5
5
RL = 100kΩ
1
5
RL = 10kΩ
10
Output Voltage Swing
VOL
Gain-Bandwidth Product
Phase Margin
2
dB
mV
GBW
9
kHz
φM
90
degrees
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Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ to VDD/2, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Slew Rate
SR
Input Voltage Noise
en
Output Short-Circuit
Current
Power-On Time
Power-Off Time
tON
tOFF
Capacitive Load
CLOAD
CONDITIONS
MIN
VOUT = 4V step
TYP
MAX
2
f = 1kHz
150
f = 10kHz
120
Shorted to VSS (sourcing)
11
Shorted to VDD (sinking)
36
V/ms
nV/√Hz
mA
2
µs
µs
2
No sustained oscillations
UNITS
250
pF
ELECTRICAL CHARACTERISTICS
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ to VDD/2, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage Range
VDD
Guaranteed by PSRR tests
Supply Current (per
Amplifier)
IDD
VDD = +5.0V
Input Offset Voltage
VOS
Input Offset Voltage
Temperature Coefficient
Input Bias Current
MIN
TYP
1.8
VCM
Common-Mode Rejection
Ratio
CMRR
Power-Supply Rejection
Ratio
PSRR
Large-Signal Voltage Gain
AVOL
UNITS
5.5
V
1.5
µA
±15
mV
8
TCVOS
IB
Input Common-Mode
Voltage Range
MAX
Guaranteed by the CMRR test
VSS
VSS ≤ VCM ≤ (VDD - 1.1V)
56
+1.8V ≤ VDD ≤ +5.5V, 0oC ≤ TA ≤ +85oC
65
+2V ≤ VDD ≤ +5.5V, -40oC ≤ TA ≤ +85oC
65
VOUT = 50mV to VDD - 50mV, RL = 1MΩ
75
VOUT = 200mV to VDD - 200mV, RL = 100kΩ
75
µV/°C
4.25
nA
VDD 1.1
V
dB
dB
dB
VOH
Swing high specified
as VDD - VOH
RL = 1MΩ
5
RL = 100kΩ
15
VOL
Swing low specified as
VOL - VSS
RL = 1MΩ
5
RL = 100kΩ
5
Output Voltage Swing
mV
Note 1: All devices are production tested at TA = +25°C. All temperature limits are guaranteed by design.
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3
MAX44264
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VDD = +5V, VSS = 0V, VCM = 0V, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs.
TEMPERATURE
0.8
0.6
0.5
0.4
0.3
0.7
0.6
0.5
0.4
0.3
0.2
0.2
0.1
0.1
0
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
0.40
0.25
0.20
0.15
0.10
0.05
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
TEMPERATURE (°C)
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
INPUT BIAS CURRENT vs.
TEMPERATURE
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
0.30
0.25
0.20
0.15
0.10
-100
-150
-200
-250
-300
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-30
-40
-50
-60
-80
-90
-400
0
-20
-70
-350
0.05
-50
-25
0
25
50
75
0
100
0.5
1.0
1.5
2.0
2.5
3.0
3.5
COMMON-MODE VOLTAGE (V)
TEMPERATURE (°C)
COMMON-MODE VOLTAGE (V)
POWER-SUPPLY REJECTION RATIO vs.
FREQUENCY
OUTPUT VOLTAGE SWING LOW vs.
TEMPERATURE
OUTPUT VOLTAGE SWING HIGH vs.
TEMPERATURE
1.4
RL = 100kΩ
5
1.2
-40
-50
-60
-70
VDD - VOH (mV)
VOL - VSS (mV)
-30
1.0
0.8
0.6
0.4
-80
RL = 1MΩ
-90
10
100
1k
FREQUENCY (Hz)
10k
3
2
RL = 1MΩ
0
0
-100
RL = 100kΩ
4
1
0.2
4.0
MAX44264 toc09
-20
6
MAX44264 toc08
1.6
MAX44264 toc07
0
-10
100
MAX44264 toc06
0
-10
INPUT BIAS CURRENT (pA)
-50
INPUT BIAS CURRENT (pA)
0.35
MAX44264 toc05
0
MAX44264 toc04
0.40
4
0.30
TEMPERATURE (°C)
0.45
0
0.35
SUPPLY VOLTAGE (V)
0.50
OFFSET VOLTAGE (mV)
0.45
OFFSET VOLTAGE (mV)
SUPPLY CURRENT (μA)
0.7
0.50
MAX44264 toc02
0.8
SUPPLY CURRENT (μA)
0.9
MAX44264 toc01
0.9
OFFSET VOLTAGE vs.
TEMPERATURE
MAX44264 toc03
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
PSRR (dB)
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
-50
-25
0
25
50
TEMPERATURE (°C)
75
100
-50
-25
0
25
50
TEMPERATURE (°C)
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75
100
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
1.2
-70
-80
-90
-100
0.8
0.6
0
25
50
75
100
60
-50
0
25
50
75
2.5
100
3.0
4.0
4.5
OUTPUT VOLTAGE (Vp-p)
GAIN AND PHASE vs. FREQUENCY
GAIN AND PHASE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
GAIN
45
0
GAIN (dB)
90
-45
PHASE
-90
100
1k
10k
-135
100k
180
5.0
MAX44264 toc15
10.00
135
GAIN
90
45
0
RL = 1MΩ
AVCL = 1000V/V
CL = 250pF
1
10
0.10
-45
PHASE
1.00
-90
100
1k
10k
-135
100k
0.01
10
100
1k
10k
FREQUENCY (Hz)
STABILITY vs. CAPACITIVE
AND RESISTIVE LOADS
VOLTAGE NOISE DENSITY vs.
FREQUENCY
100
36
ISINK
32
28
10k
IOUT (mA)
CAPACITIVE LOAD (pF)
1k
IOUT vs. VOUT
40
MAX44264 toc17
100k
MAX44264 toc16
10k
MAX44264 toc18
10
MAX44264 toc14
80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
PHASE (deg)
MAX44264 toc13
180
CL = 12pF
RL = 1MΩ 135
AVCL = 1000V/V
FREQUENCY (Hz)
NOISE (nV/√Hz)
3.5
TEMPERATURE (°C)
80
70
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
1
-25
TEMPERATURE (°C)
PHASE (deg)
GAIN (dB)
-25
RL = 10kΩ
100
70
0
-50
110
80
0.2
-120
RL = 100kΩ
90
0.4
-110
RL = 1MΩ
120
1.0
AVOL (dB)
-60
130
THD + N (%)
CMRR (dB)
-50
140
MAX44264 toc11
-40
MINIMUM SUPPLY VOLTAGE (V)
-30
AVOL vs. OUTPUT VOLTAGE SWING
1.4
MAX44264 toc10
-20
MINIMUM SUPPLY VOLTAGE
vs. TEMPERATURE
MAX44264 toc12
COMMON-MODE REJECTION RATIO vs.
TEMPERATURE
UNSTABLE
REGION
1k
24
20
16
12
ISOURCE
8
4
0
100
10
10
100
1k
10k
FREQUENCY (Hz)
100k
10k
100k
RESISTIVE LOAD (Ω)
1M
0
1
2
3
4
5
VOUT (V)
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5
MAX44264
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted.)
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 250pF
INPUT
50mV/div
INPUT
50mV/div
OUTPUT
50mV/div
OUTPUT
50mV/div
OUTPUT
500mV/div
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 1000pF
500μs/div
500μs/div
500μs/div
MAX44264 toc23
MAX44264 toc22
OUTPUT
500mV/div
30
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 1000pF
INPUT
500mV/div
25
PERCENT OVERSHOOT (%)
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 12pF
INPUT
500mV/div
PERCENT OVERSHOOT
vs. CAPACITIVE LOAD
LARGE-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
OUTPUT
500mV/div
MAX44264 toc24
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 12pF
MAX44264 toc21
MAX44264 toc20
MAX44264 toc19
INPUT
500mV/div
SMALL-SIGNAL STEP RESPONSE
SMALL-SIGNAL STEP RESPONSE
SMALL-SIGNAL STEP RESPONSE
RL = 1MΩ
20
RL = 100kΩ
15
10
RL = 10kΩ
5
0
0
500μs/div
500μs/div
50
100
150
CLOAD (pF)
SMALL-SIGNAL GAIN vs. FREQUENCY
1
0
1
0
GAIN (dB)
-2
-3
-4
AV = 1
-1
-2
-3
-4
-5
-5
-6
-6
-7
-7
100
1k
FREQUENCY (Hz)
6
RL = 100kΩ
VOUT = 100mVP-P
CL = 12pF
2
AV = 1
-1
MAX44264 toc26
RL = 10kΩ
VOUT = 100mVP-P
CL = 12pF
2
SMALL-SIGNAL GAIN vs. FREQUENCY
3
MAX44264 toc25
3
GAIN (dB)
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
10k
100
1k
10k
100k
FREQUENCY (Hz)
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200
250
300
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
RL = 1MΩ
VOUT = 100mVP-P
CL = 12pF
1
AV = 1
-1
RL = 10kΩ
VOUT = 1VP-P
CL = 12pF
0
GAIN (dB)
GAIN (dB)
0
2
-2
-3
AV = 1
-1
-2
-3
-4
-4
-5
-5
-6
-6
-7
-7
100
1k
10k
100
100k
LARGE-SIGNAL GAIN vs. FREQUENCY
2
1
RL = 100kΩ
VOUT = 1VP-P
CL = 12pF
2
1
RL = 1MΩ
VOUT = 1VP-P
CL = 12pF
AV = 1
0
-1
GAIN (dB)
GAIN (dB)
LARGE-SIGNAL GAIN vs. FREQUENCY
AV = 1
0
10k
3
MAX44264 toc29
3
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX44264 toc30
1
MAX44264 toc27
2
3
MAX44264 toc28
LARGE-SIGNAL GAIN vs. FREQUENCY
SMALL-SIGNAL GAIN vs. FREQUENCY
3
-2
-3
-4
-1
-2
-3
-4
-5
-5
-6
-6
-7
-7
100
1k
FREQUENCY (Hz)
10k
100
1k
10k
FREQUENCY (Hz)
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7
MAX44264
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted.)
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
MAX44264
Pin Configuration
TOP VIEW
MAX44264
+
IN+
A1
A2
VSS
IN-
B1
B2
VDD
OUT
C1
C2
N.C.
WLP BUMP
SIDE DOWN
Pin Description
PIN
NAME
FUNCTION
A1
IN+
Noninverting Amplifier Input
A2
VSS
Negative Power-Supply Voltage
B1
IN-
Inverting Amplifier Input
B2
VDD
Positive Power-Supply Voltage
C1
OUT
Amplifier Output
C2
N.C.
No Connection. Not internally connected.
Applications Information
Ground Sensing
The common-mode input range of the MAX44264
extends down to ground, and offers excellent commonmode rejection. These devices are guaranteed not to
undergo phase reversal when the input is overdriven.
Power Supplies and Layout
applications, good layout is extremely important
because low-power requirements demand high-impedance circuits. The layout should also minimize stray
capacitance at the amplifier inputs. However some stray
capacitance may be unavoidable, and it may be necessary to add a 2pF to 10pF capacitor across the feedback
resistor as shown in Figure 1. Select the smallest capacitor value that ensures stability.
The IC operates from a single +1.8V to +5.5V power
supply. Bypass power supplies with a 0.1µF ceramic
capacitor placed close to the VDD pin.
Ground layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and outputs. To decrease stray capacitance, minimize PCB lengths and resistor leads, and place external
components close to the op amps’ pins.
Bandwidth
VCC
VIN
MAX44264
VSS
R2
The IC is internally compensated for unity-gain stability
and has a typical gain-bandwidth of 9kHz.
Stability
The IC maintains stability in their minimum gain configuration while driving capacitive loads. Although this product family is primarily designed for low-frequency
8
R1
2pF TO 10pF
Figure 1. Compensation for Feedback Node Capacitance
Chip Information
PROCESS: BiCMOS
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Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
6 WLP
W61B1+1
21-0217
—
_______________________________________________________________________________________
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9
MAX44264
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
Revision History
REVISION
NUMBER
REVISION
DATE
0
12/10
DESCRIPTION
PAGES
CHANGED
Initial release
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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