General Description
The MAX44265 op amp features a maximized ratio of
gain bandwidth (GBW) to supply current and is ideal for
battery-powered applications such as handsets,
tablets, notebooks, and portable medical equipment.
This CMOS op amp features an ultra-low input-bias cur-
rent of 1pA, rail-to- rail input and output, low supply cur-
rent of 4µA, and operates from a single 1.8V to 5.5V
supply. For additional power conservation, the IC also
features a low-power shutdown mode that reduces sup-
ply current to 1nA and puts the amplifier’s outputs in a
high-impedance state. This device is unity-gain stable
with a 200kHz GBW product.
It is available in a space-saving, 0.9mm x 1.3mm,
6-bump WLP package and is specified over the -40°C
to +85°C extended operating temperature range.
Applications
Cell Phones
Tablet/Notebook Computers
Mobile Accessories
Battery-Powered Devices
Features
200kHz GBW
Ultra-Low 4µA Supply Current
Single 1.8V to 5.5V Supply Voltage Range
Ultra-Low 1pA Input Bias Current
Rail-to-Rail Input and Output Voltage Ranges
Low ±200µV Input Offset Voltage
Low 0.001µA Shutdown Current
High-Impedance Output During Shutdown
Unity-Gain Stable
Available in a Tiny, 0.9mm x 1.3mm, 6-Bump WLP
Package
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
________________________________________________________________
Maxim Integrated Products
1
19-5709; Rev 0; 12/10
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.
EVALUATION KIT
AVAILABLE
Ordering Information
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX44265EWT+ -40°C to +85°C 6 WLP +BY
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
Power-Supply Voltage (VDD to VSS) ......................-0.3V to +6.0V
IN_+, IN_-, OUT_, SHDN_............... (VSS - 0.3V) to (VDD + 0.3V)
Current into IN_+, IN_- ......................................................±20mA
Output Short-Circuit Duration to VDD or VSS ..............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
Soldering Temperature (reflow) .......................................+260°C
ELECTRICAL CHARACTERISTICS
(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= connected to VDD/2, SHDN_ = VDD, TA= +25°C, unless otherwise
noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by PSRR test 1.8 5.5 V
VDD = 1.8V 4
Supply Current IDD VDD = 5.5V 4 5.0 µA
Shutdown Supply Current IDD
(
SHDN_
)
SHDN_ = GND 0.001 0.5 µA
Input Offset Voltage VOS ±0.2 ±1mV
Input Bias Current IB(Note 2) ±1±10 pA
Input Offset Current IOS (Note 2) ±1±10 pA
Common mode 1
Input Resistance RIN Differential mode, -1mV < VIN < +1mV 10 G
Input Common-Mode Range VCM Guaranteed by CMRR test VSS -
0.1
VDD +
0.1 V
Common-Mode Rejection Ratio CMRR -0.1V < VCM < VDD + 0.1V, VDD = 5.5V 70 80 dB
Power-Supply Rejection Ratio PSRR 1.8V < VDD < 5.5V 65 95 dB
25mV < VOUT < VDD - 25mV,
RL = 100k, VDD = 5.5V 95 120
Open-Loop Gain AVOL 100mV < VOUT < VDD - 100mV,
RL = 5k, VDD = 5.5V 95 110
dB
RL = 100k2.5 5
RL = 5k50 70Output-Voltage-Swing High VOH VDD - VOUT
RL = 1k250
mV
RL = 100k2.5 5
RL = 5k50 70
Output-Voltage-Swing Low VOL VOUT - VSS
RL = 1k250
mV
Output Short-Circuit Current IOUT(SC) ±15 mA
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VDD = 1.8V to 3.6V 0.4
SHDN_ Logic Low VIL VDD = 3.6V to 5.5V 0.8 V
VDD = 1.8V to 3.6V 1.4
SHDN_ Logic High VIH VDD = 3.6V to 5.5V 2 V
IIL SHDN_ = VSS (Note 2) 1
SHDN_ Input Bias Current IIH SHDN_ = VDD 500 nA
Output Leakage in Shutdown IOUT
(
SHDN_
)
SHDN_ = VSS, VOUT = 0V to VDD 1 500 nA
Gain-Bandwidth Product 200 kHz
Slew Rate 0.1 V/µs
AV = 1V/V 30
AV = 10V/V 250
RL = 5k, AV = 1V/V 200
Capacitive-Load Stability (See
the Driving Capacitive Loads
Section)
CLOAD No sustained
oscillations
RISO = 1k, AV = 1V/V 100
pF
Input Voltage-Noise Density f = 1kHz 400 nV/Hz
Input Current-Noise Density f = 1kHz 0.001 pA/Hz
Settling Time To 0.1%, VOUT = 2V step, AV = -1V/V 18 µs
Delay Time to Shutdown tSH IDD = 5% of normal operation,
VDD = 5.5V, VSHDN_ = 5.5V to 0 step s
Delay Time to Enable tEN VOUT = 2.7V, VOUT settles to 0.1%,
VDD = 5.5V, VSHDN_ = 0 to 5.5V step 30 µs
Power-Up Time VDD = 0 to 5.5V step 5 µs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= connected to VDD/2, SHDN_ = VDD, TA= +25°C, unless otherwise
noted.) (Note 1)
ELECTRICAL CHARACTERISTICS
(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= connected to VDD/2, SHDN_ = VDD, TA= -40°C to +85°C, unless
otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by PSRR test 1.8 5.5 V
Supply Current IDD VDD = 5.5V 5.5 µA
Shutdown Supply Current IDD
(
SHDN_
)
SHDN_ = GND 1 µA
Input Offset Voltage VOS ±5mV
Input-Offset-Voltage
Temperature Coefficient TCVOS ±5 µV/°C
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
4 _______________________________________________________________________________________
Note 1: Specifications are 100% tested at TA= +25°C (exceptions noted). All temperature limits are guaranteed by design.
Note 2: Guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL= connected to VDD/2, SHDN_ = VDD, TA= -40°C to +85°C, unless
otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Bias Current IB±30 pA
Input Offset Current IOS ±20 pA
Input Common-Mode Range VCM Guaranteed by CMRR test VSS -
0.05
VDD +
0.05 V
Common-Mode Rejection Ratio CMRR -0.05V < VCM < VDD + 0.05V, VDD = 5.5V 60 dB
Power-Supply Rejection Ratio PSRR 1.8V < VDD < 5.5V 59 dB
25mV < VOUT < VDD - 25mV,
RL = 100k, VDD = 5.5V 85
Open-Loop Gain AVOL 150mV < VOUT < VDD - 150mV,
RL = 5k, VDD = 5.5V 80
dB
RL = 100k5
Output-Voltage-Swing High VOH VDD - VOUT RL = 5k90 mV
RL = 100k5
Output-Voltage-Swing Low VOL VOUT - VSS RL = 5k90 mV
VDD = 1.8V to 3.6V 0.4
SHDN_ Logic Low VIL VDD = 3.6V to 5.5V 0.8 V
VDD = 1.8V to 3.6V 1.4
SHDN_ Logic High VIH VDD = 3.6V to 5.5V 2 V
IIL SHDN_ = VSS 5nA
SHDN_ Input-Bias Current IIH SHDN_ = VDD 1000 nA
Output Leakage in Shutdown IOUT
(
SHDN_
)
SHDN_ = VSS, VOUT = 0V to VDD 1000 nA
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
_______________________________________________________________________________________
5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX44265 toc01
VSUPPLY (V)
ICC (µA)
5.04.22.6 3.4
2
3
4
5
7
6
8
9
1
1.8 5.5
TA = -40°C
TA = +25°C
TA = +85°C
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX44265 toc02
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
603510-15
2
4
6
8
10
12
0
-40 85
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
MAX44265 toc03
VCM (V)
VOS (µV)
2.52.00.5 1.0 1.5
-750
-500
-250
0
250
500
750
1000
-1000
0 3.0
TA = +85°C
TA = -40°C
TA = +25°C
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX44265 toc04
TEMPERATURE (°C)
VOS (µV)
603510-15
-300
-250
-200
-150
-100
-50
0
50
100
150
200
-350
-40 85
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX44265 toc07
FREQUENCY (Hz)
PSRR (dB)
1k100101
-100
-80
-60
-40
-20
0
-120
0.1 10k
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX44265 toc05
TEMPERATURE (°C)
IB (pA)
603510-15
-2
-1
0
1
2
3
4
5
6
7
-3
-40 85
IB+
IB-
INPUT BIAS CURRENT
vs. INPUT COMMON-MODE VOLTAGE
MAX44265 toc06
VCM (V)
IB (pA)
3.02.51.5 2.00.5 1.00
-4
-3
-2
-1
0
1
2
3
4
5
-5
-0.5 3.5
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
MAX44265 toc08
TEMPERATURE (°C)
CMRR (dB)
603510-15
20
40
60
80
100
120
140
0
-40 85
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX44265 toc09
FREQUENCY (Hz)
CMRR (dB)
10k1k100101 100k
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-100
Typical Operating Characteristics
(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA= +25°C, unless otherwise noted.)
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
6 _______________________________________________________________________________________
SLEW RATE
vs. SUPPLY VOLTAGE
MAX44265 toc10
SUPPLY VOLTAGE (V)
SLEW RATE (V/µS)
5.04.23.42.6
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
-0.4
1.8 5.5
OUTPUT-SWING HIGH
vs. TEMPERATURE
MAX44265 toc11
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (mV)
603510-15
10
100
1000
1
-40 85
RL = 1k
RL = 100k
RL = 5k
RL TO VSS
VOH = VDD - VOUT
OUTPUT-SWING LOW
vs. TEMPERATURE
MAX44265 toc12
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (mV)
603510-15
10
100
1000
10000
1
-40 85
RL = 1k
RL = 100k
RL = 5k
VOL = VOUT - VSS
RL TO VDD
OPEN-LOOP GAIN
vs. TEMPERATURE (RL TO VSS)
MAX44265 toc13
AVOL (dB)
20
40
60
80
100
120
140
0
TEMPERATURE (°C)
603510-15-40 85
RL = 1k
RL = 100k
RL = 5k
GAIN AND PHASE
vs. FREQUENCY (RL = 5k, CLOAD = 100pF)
100
-100
MAX44265 toc16
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
100k10k10 100 1k
-60
-40
-20
0
20
40
60
80
-80
-135
-90
-45
45
0
90
135
180
-180
-225
225
11M
GAIN
PHASE
AV = 1000V/V
OPEN-LOOP GAIN
vs. TEMPERATURE (RL TO VDD)
MAX44265 toc14
AVOL (dB)
20
40
60
80
100
120
140
0
TEMPERATURE (°C)
603510-15-40 85
RL = 1k
RL = 5k
RL = 100k
GAIN AND PHASE
vs. FREQUENCY (RL = , CLOAD = 15pF)
MAX44265 toc15
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
100k10k10 100 1k
-60
-40
-20
0
20
40
60
80
-80
-135
-90
-45
0
45
90
135
180
-180
11M
GAIN
PHASE
AV = 1000V/V
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX44265 toc17
FREQUENCY (Hz)
THD+N (dB)
1k100
-85
-75
-65
-55
-45
-35
-25
-15
-5
-95
10 10k
VOUT = 2VP-P
Typical Operating Characteristics (continued)
(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA= +25°C, unless otherwise noted.)
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
_______________________________________________________________________________________
7
VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX44265 toc18
FREQUENCY (Hz)
10 100 1k 10k
1000
10,000
100
1 100k
VOLTAGE NOISE (nV/Hz)
RESISTOR ISOLATION
vs. CAPACITIVE LOAD
MAX44265 toc19
CLOAD (pF)
RISO ()
1000100
1000
2000
3000
4000
5000
6000
7000
8000
0
10 10,000
AV = 1V/V
FOR AV = 10V/V
NO RISO NEEDED
SHUTDOWN RESPONSE
20µs/div
OUTPUT
3V
0V
1.5V
0V
MAX44265 toc21
SHDN
IN+ = VDD / 2
AV = 1V/V
SMALL-SIGNAL PULSE RESPONSE
(CLOAD = 15pF)
10µs/div
OUTPUT
50mV/div
IN+
50mV/div
MAX44265 toc22
AV = 1V/V
100µs/div
OUTPUT
1V/div
IN+
100mV/div
LARGE-SIGNAL PULSE RESPONSE
(CLOAD = 100pF)
MAX44265 toc25
AV = 10V/V
SMALL-SIGNAL PULSE RESPONSE
(CLOAD = 100pF)
20µs/div
OUTPUT
50mV/div
IN+
5mV/div
MAX44265 toc23
AV = 10V/V
10µs/div
OUTPUT
1V/div
IN+
1V/div
LARGE-SIGNAL PULSE RESPONSE
(CLOAD = 15pF)
MAX44265 toc24
AV = 1V/V
Typical Operating Characteristics (continued)
(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA= +25°C, unless otherwise noted.)
POWER-UP SETTLING TIME
MAX44265 toc20
500ns/div
OUTPUT
500mV/div
VDD
1V/div
IN+ = VDD / 2
AV = 1V/V
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA= +25°C, unless otherwise noted.)
PERCENT OVERSHOOT
vs. CAPACITIVE LOAD
MAX44265 toc28
CLOAD (pF)
OVERSHOOT (%)
806020 40
0.5
1.0
1.5
2.0
3.0
2.5
3.5
4.0
0
0 100
AV = 1V/V
RL = 1M
RL = 100k
RL = 10k
OUTPUT WAVEFORM WITH RISO
(CLOAD = 100pF, RISO = 6.2k)
MAX44265 toc29
20µs/div
OUTPUT
50mV/div
IN+
50mV/div
AV = 1V/V
OUTPUT WAVEFORM WITHOUT RISO
(CLOAD = 100pF)
20µs/div
MAX44265 toc30
OUTPUT
50mV/div
IN+
50mV/div
AV = 1V/V
LARGE-SIGNAL GAIN
vs. FREQUENCY
FREQUENCY (kHz)
GAIN (dB)
-4
-3
-2
-1
0
2
1
4
3
MAX44265 toc27
100101
AV = +1V/V
VOUT = 2VP-P
CLOAD = 15pF
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX44265 toc26
FREQUENCY (kHz)
GAIN (dB)
10010
-8
-6
-4
-2
0
2
4
6
8
10
-10
1 1000
AV = +1V/V
VOUT = 100mVP-P
CLOAD = 15pF
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
_______________________________________________________________________________________ 9
PIN NAME FUNCTION
A1 IN+ Noninverting Amplifier Input
A2 VSS Negative Supply Voltage
B1 IN- Inverting Amplifier Input
C1 OUT Amplifier Output
B2 VDD Positive Supply Voltage
C2 SHDN Shutdown
Pin Description
A1 A2
B1 B2
C1 C2
IN+ VSS
IN- VDD
OUT SHDN
+
TOP VIEW
MAX44265
WLP BUMP
SIDE DOWN
Pin Configuration
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
10 ______________________________________________________________________________________
Detailed Description
Featuring a maximized ratio of GBW to supply current,
low operating supply voltage, low input bias current,
and rail-to-rail inputs and outputs, the MAX44265 is an
excellent choice for precision or general-purpose, low-
current, low-voltage, battery-powered applications. This
CMOS device consumes an ultra-low 4µA (typ) supply
current and has a 200µV (typ) offset voltage. For addi-
tional power conservation, the IC features a low-power
shutdown mode that reduces supply current to 1nA
(typ) and puts the amplifier’s output in a high-imped-
ance state. This device is unity-gain stable with a
200kHz GBW product, driving capacitive loads up to
30pF. The capacitive load can be increased to 250pF
when the amplifier is configured for a 10V/V gain.
Rail-to-Rail Inputs and Outputs
The IC has a parallel-connected n- and p-channel dif-
ferential input stage that allows an input common-mode
voltage range that extends 100mV beyond the positive
and negative supply rails, with excellent common-mode
rejection. The IC is capable of driving the output to
within 5mV of both supply rails with a 100kload. This
device can drive a 5kload with swings to within 60mV
of the rails. Figure 1 shows the output voltage swing of
the IC configured as a unity-gain buffer powered from a
single 3V supply.
Low Input Bias Current
The IC features ultra-low 1pA (typ) input bias current.
The variation in the input bias current is minimal with
changes in the input voltage due to very high input
impedance (in the order of 1G).
Applications Information
Driving Capacitive Loads
The IC’s amplifier is unity-gain stable for loads up to
30pF. However, the capacitive load can be increased
to 250pF when the amplifier is configured for a mini-
mum gain of 10V/V. Applications that require greater
capacitive-drive capability should use an isolation
resistor between the output and the capacitive load
(Figure 2). Also, in unity-gain applications with relatively
small RL(approximately 5k), the capacitive load can
be increased up to 200pF.
Figure 1. Rail-to-Rail Output Voltage Range
RAIL-TO-RAIL OUTPUT VOLTAGE RANGE
200µs/div
IN_
3V
3V
0V
0V
1V/div
OUT_
1V/div
Figure 2. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
MAX44265
RISO
CL
RL
AV = 1V/V
RL
RL + RISO
MAX44265
Chip Information
PROCESS: BiCMOS
Power-Supply Considerations
The IC is optimized for single 1.8V to 5.5V supply oper-
ation. A high amplifier power-supply rejection ratio of
95dB (typ) allows the devices to be powered directly
from a battery, simplifying design and extending bat-
tery life.
Power-Up Settling Time
The IC typically requires 5µs after power-up. Supply
settling time depends on the supply voltage, the value
of the bypass capacitor, the output impedance of the
incoming supply, and any lead resistance or induc-
tance between components. Op-amp settling time
depends primarily on the output voltage and is slew-
rate limited. Figure 3 shows MAX44265 in a noninvert-
ing voltage follower configuration with the input held at
midsupply. The output settles in approximately 18µs for
VDD = 3V (see the
Typical Operating Characteristics
for
power-up settling time).
Shutdown Mode
The IC features an active-low shutdown input. The
device enters shutdown in 2µs (typ) and exit in 30µs
(typ). The amplifier’s outputs are in a high-impedance
state in shutdown mode. Drive SHDN low to enter shut-
down. Drive SHDN high to enable the amplifier.
Power-Supply Bypassing and Layout
To minimize noise, bypass VDD with a 0.1µF capacitor
to ground, as close to the pin as possible.
Good layout techniques optimize performance
by decreasing the amount of stray capacitance and
inductance to the op amps’ inputs and outputs.
Minimize stray capacitance and inductance by placing
external components close to the IC.
Figure 3. Power-Up Test Configuration
MAX44265
100k
100k
OUT
IN-
IN+
0V
5.5V
VDD
VSS
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
______________________________________________________________________________________ 11
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown in a Tiny, 6-Bump WLP
12 ______________________________________________________________________________________
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
MAX44265
Rail-to-Rail, 200kHz Op Amp
with Shutdown 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
13
© 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