General Description
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 ultra-
low supply current, low-operating voltage, and rail-to-
rail output capabilities make these operational
amplifiers ideal for use in single lithium ion (Li+), or two-
cell NiCd or alkaline battery systems. The rail-to-rail out-
put 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 sup-
ply. The IC is unity-gain stable and available in a
space-saving 0.9mm x 1.3mm, 6-bump WLP package.
Applications
Cell Phones
Tablet/Notebook Computers
Mobile Accessories
Battery-Powered Devices
Features
oUltra-Low 750nA Supply Current per Amplifier
oUltra-Low +1.8V Supply Voltage Operation
oGround-Sensing Input Common-Mode Range
oOutputs Swing Rail-to-Rail
oOutputs Source and Sink 11mA of Load Current
oNo Phase Reversal for Overdriven Inputs
oHigh 120dB Open-Loop Voltage Gain
oLow 500µV Input Offset Voltage
o9kHz Gain-Bandwidth Product
o250pF (min) Capacitive Load Capability
oAvailable in a Tiny, 0.9mm x 1.3mm, 6-Bump WLP
Package
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
________________________________________________________________
Maxim Integrated Products
1
19-5708; Rev 0; 12/10
EVALUATION KIT
AVAILABLE
Ordering Information
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX44264EWT+ -40°C to +85°C 6 WLP +CB
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= ∞to VDD/2, TA= +25°C, unless otherwise noted.)
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.
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by PSRR tests 1.8 5.5 V
VDD = +1.8V 0.6
Supply Current (per
Amplifier) IDD VDD = +5.0V 0.75 1.2 µA
Input Offset Voltage VOS ±0.5 ±7.0 mV
Input Bias Current IB±200 ±1500 pA
Input Offset Current IOS ±12.5 pA
Input Common-Mode
Voltage Range VCM Guaranteed by the CMRR test VSS 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
RL = 100kΩ, VOUT = 200mV to VDD - 200mV 90 112
Large-Signal Voltage Gain AVOL
RL = 10kΩ, VOUT = 200mV to VDD - 200mV 100
dB
RL = 1MΩ14
RL = 100kΩ410VOH
Swing high
specified as
VDD - VOH RL = 10kΩ40
RL = 1MΩ0.5 5
RL = 100kΩ15
Output Voltage Swing
VOL
Swing low
specified as
VOL - VSS RL = 10kΩ10
mV
Gain-Bandwidth Product GBW 9 kHz
Phase Margin φM90 d eg r ees
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
_______________________________________________________________________________________ 3
Note 1: All devices are production tested at TA= +25°C. All temperature limits are guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= ∞to VDD/2, TA= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Slew Rate SR VOUT = 4V step 2 V/ms
f = 1kHz 150
Input Voltage Noise enf = 10kHz 120 nV /√Hz
Shorted to VSS (sourcing) 11
Output Short-Circuit
Current Shorted to VDD (sinking) 36 mA
Power-On Time tON 2µs
Power-Off Time tOFF 2µs
Capacitive Load CLOAD No sustained oscillations 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 MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by PSRR tests 1.8 5.5 V
Supply Current (per
Amplifier) IDD VDD = +5.0V 1.5 µA
Input Offset Voltage VOS ±15 mV
Input Offset Voltage
Temperature Coefficient TCVOS 8 µV/°C
Input Bias Current IB4.25 nA
Input Common-Mode
Voltage Range VCM Guaranteed by the CMRR test VSS VDD -
1.1 V
Common-Mode Rejection
Ratio CMRR VSS ≤ VCM ≤ (VDD - 1.1V) 56 dB
+1.8V ≤ VDD ≤ +5.5V, 0oC ≤ TA ≤ +85oC65
Power-Supply Rejection
Ratio PSRR +2V ≤ VDD ≤ +5.5V, -40oC ≤ TA ≤ +85oC65 dB
VOUT = 50mV to VDD - 50mV, RL = 1MΩ75
Large-Signal Voltage Gain AVOL VOUT = 200mV to VDD - 200mV, RL = 100kΩ75 dB
RL = 1MΩ5
VOH Swing high specified
as VDD - VOH RL = 100kΩ15
RL = 1MΩ5
Output Voltage Swing
VOL Swing low specified as
VOL - VSS RL = 100kΩ5
mV
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD = +5V, VSS = 0V, VCM = 0V, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.)
0
0.2
0.1
0.5
0.4
0.3
0.7
0.8
0.6
0.9
1.5 3.0 3.52.0 2.5 4.0 4.5 5.0 5.5 6.0
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX44264 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
0
0.2
0.1
0.5
0.4
0.3
0.7
0.8
0.6
0.9
-50 0-25 25 50 75 100
SUPPLY CURRENT vs.
TEMPERATURE
MAX44264 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
0
0.10
0.05
0.30
0.20
0.25
0.15
0.40
0.45
0.35
0.50
-50 0-25 25 50 75 100
OFFSET VOLTAGE vs.
TEMPERATURE
MAX44264 toc03
TEMPERATURE (°C)
OFFSET VOLTAGE (mV)
0
0.10
0.05
0.20
0.15
0.30
0.25
0.35
0.45
0.40
0.50
0 1.0 1.50.5 2.0 2.5 3.0 3.5 4.0
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX44264 toc04
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (mV)
-400
-350
-150
-250
-200
-300
-50
-100
0
-50 0-25 25 50 75 100
INPUT BIAS CURRENT vs.
TEMPERATURE
MAX44264 toc05
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
-90
-70
-80
-40
-50
-60
-20
-10
-30
0
01.51.00.5 2.0 2.5 3.0 3.5 4.0
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE
MAX44264 toc06
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (pA)
0
-100
10 100 10k1k
POWER-SUPPLY REJECTION RATIO vs.
FREQUENCY
-80
-90
MAX44264 toc07
FREQUENCY (Hz)
PSRR (dB)
-60
-70
-40
-30
-50
-20
-10
0
0.2
1.0
0.6
0.8
0.4
1.4
1.2
1.6
-50 0-25 25 50 75 100
OUTPUT VOLTAGE SWING LOW vs.
TEMPERATURE
MAX44264 toc08
TEMPERATURE (°C)
VOL - VSS (mV)
RL = 100kΩ
RL = 1MΩ
0
1
4
2
3
5
6
-50 0-25 25 50 75 100
OUTPUT VOLTAGE SWING HIGH vs.
TEMPERATURE
MAX44264 toc09
TEMPERATURE (°C)
VDD - VOH (mV)
RL = 100kΩ
RL = 1MΩ
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
_______________________________________________________________________________________
5
-120
-100
-110
-60
-80
-70
-90
-40
-30
-50
-20
-50 0-25 25 50 75 100
COMMON-MODE REJECTION RATIO vs.
TEMPERATURE
MAX44264 toc10
TEMPERATURE (°C)
CMRR (dB)
0
0.4
0.2
0.8
0.6
1.2
1.0
1.4
-50 0 25-25 50 75 100
MINIMUM SUPPLY VOLTAGE
vs. TEMPERATURE
MAX44264 toc11
TEMPERATURE (°C)
MINIMUM SUPPLY VOLTAGE (V)
60
70
80
90
100
110
120
130
140
2.5 3.0 3.5 4.0 4.5 5.0
AVOL vs. OUTPUT VOLTAGE SWING
MAX44264 toc12
OUTPUT VOLTAGE (Vp-p)
AVOL (dB)
RL = 1MΩ
RL = 10kΩ
RL = 100kΩ
1 100 1k 10k10 100k
GAIN AND PHASE vs. FREQUENCY
MAX44264 toc13
FREQUENCY (Hz)
GAIN (dB)
PHASE (deg)
80
70
60
50
40
30
20
-60
10
0
-10
-20
-30
-40
-50
180
135
90
45
-135
0
-45
-90
GAIN
PHASE
CL = 12pF
RL = 1MΩ
AVCL = 1000V/V
1 100 1k 10k10 100k
GAIN AND PHASE vs. FREQUENCY
MAX44264 toc14
GAIN (dB)
PHASE (deg)
80
70
60
50
40
30
20
-60
10
0
-10
-20
-30
-40
-50
180
135
90
45
-135
0
-45
-90
GAIN
PHASE
RL = 1MΩ
AVCL = 1000V/V
CL = 250pF
10.00
0.01
10 100 10k1k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX44264 toc15
FREQUENCY (Hz)
THD
+
N
(%)
0.10
1.00
10k
10
10 1k100 100k10k
VOLTAGE NOISE DENSITY vs.
FREQUENCY
MAX44264 toc16
FREQUENCY (Hz)
100
1k
NOISE (nV/√Hz)
100k
100
10k 100k 1M
STABILITY vs. CAPACITIVE
AND RESISTIVE LOADS
MAX44264 toc17
RESISTIVE LOAD (Ω)
1k
10k
CAPACITIVE LOAD (pF)
UNSTABLE
REGION
0
12
8
4
16
20
24
28
32
36
40
021345
IOUT vs. VOUT
MAX44264 toc18
VOUT (V)
IOUT (mA)
ISINK
ISOURCE
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.)
500μs/div
SMALL-SIGNAL STEP RESPONSE
INPUT
50mV/div
OUTPUT
50mV/div
MAX44264 toc21
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 1000pF
500μs/div
LARGE-SIGNAL STEP RESPONSE
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 12pF
INPUT
500mV/div
OUTPUT
500mV/div
MAX44264 toc22
500μs/div
LARGE-SIGNAL STEP RESPONSE
INPUT
500mV/div
OUTPUT
500mV/div
MAX44264 toc23
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 1000pF
0
5
20
10
15
25
30
010050 150 200 250 300
PERCENT OVERSHOOT
vs. CAPACITIVE LOAD
MAX44264 toc24
CLOAD (pF)
PERCENT OVERSHOOT (%)
RL = 10kΩ
RL = 100kΩ
RL = 1MΩ
3
-7
100 1k 10k
SMALL-SIGNAL GAIN vs. FREQUENCY
-5
-6
MAX44264 toc25
FREQUENCY (Hz)
GAIN (dB)
-3
-4
-1
0
-2
1
2RL = 10kΩ
VOUT = 100mVP-P
CL = 12pF
AV = 1
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
6 _______________________________________________________________________________________
500μs/div
SMALL-SIGNAL STEP RESPONSE
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 12pF
INPUT
500mV/div
OUTPUT
500mV/div
MAX44264 toc19
500μs/div
SMALL-SIGNAL STEP RESPONSE
INPUT
50mV/div
OUTPUT
50mV/div
MAX44264 toc20
VDD = +5V
AV = +1V/V
RL = 1MΩ
CL = 250pF
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.)
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, RL= 100kΩto VDD/2, TA= +25°C, unless otherwise noted.)
3
-7
100 1k 10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-5
-6
MAX44264 toc28
FREQUENCY (Hz)
GAIN (dB)
-3
-4
-1
0
-2
1
2
AV = 1
RL = 10kΩ
VOUT = 1VP-P
CL = 12pF
3
-7
100 1k 10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-5
-6
MAX44264 toc29
FREQUENCY (Hz)
GAIN (dB)
-3
-4
-1
0
-2
1
2
AV = 1
RL = 100kΩ
VOUT = 1VP-P
CL = 12pF
3
-7
100 1k 10k
LARGE-SIGNAL GAIN vs. FREQUENCY
-5
-6
MAX44264 toc30
FREQUENCY (Hz)
GAIN (dB)
-3
-4
-1
0
-2
1
2
AV = 1
RL = 1MΩ
VOUT = 1VP-P
CL = 12pF
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
8 _______________________________________________________________________________________
Applications Information
Ground Sensing
The common-mode input range of the MAX44264
extends down to ground, and offers excellent common-
mode rejection. These devices are guaranteed not to
undergo phase reversal when the input is overdriven.
Power Supplies and Layout
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, mini-
mize PCB lengths and resistor leads, and place external
components close to the op amps’ pins.
Bandwidth
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 configu-
ration while driving capacitive loads. Although this prod-
uct family is primarily designed for low-frequency
applications, good layout is extremely important
because low-power requirements demand high-imped-
ance circuits. The layout should also minimize stray
capacitance at the amplifier inputs. However some stray
capacitance may be unavoidable, and it may be neces-
sary to add a 2pF to 10pF capacitor across the feedback
resistor as shown in Figure 1. Select the smallest capaci-
tor value that ensures stability.
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.
R1
2pF TO 10pF
R2
VIN
VCC
VSS
MAX44264
Figure 1. Compensation for Feedback Node Capacitance
Chip Information
PROCESS: BiCMOS
WLP BUMP
SIDE DOWN
OUT N.C.
IN- VDD
IN+ VSS
C1 C2
B1 B2
A2
A1
+
TOP VIEW
MAX44264
Pin Configuration
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
_______________________________________________________________________________________ 9
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.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
6 WLP W61B1+1 21-0217 —
MAX44264
Ultra-Low Power Op Amp in
a Tiny 6-Bump WLP
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.
10
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© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/10 Initial release —