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19-2023; Rev 0; 1/02
1.0V Micropower, SOT23, Operational Amplifier
General Description
The MAX4289 micropower, operational amplifier is optimized for ultra-low supply voltage operation. The amplifier consumes only 9A of quiescent supply current and is fully specified for operation from a single 1.0V to 5.5V power supply. This ultra-low voltage operation together with the low quiescent current consumption make the MAX4289 ideal for use in battery-powered systems operated from as little as a single alkaline cell. The MAX4289 also features a wide input common-mode range that includes the ground, and an output voltage swing that is virtually Rail-to-Rail(R), allowing almost all of the power supply to be used for signal voltage. The low input offset voltage and low input bias current specifications along with the high open-loop gain make the MAX4289 well-suited to applications requiring a high degree of precision. The MAX4289 is available in a tiny 6-pin SOT23 package. All specifications are guaranteed over the extended temperature range of -40C to +85C.
Features
o Ultra-Low Voltage Operation: Guaranteed Specifications from 1.0V to 5.5V o Input Common-Mode Range: 0 to (VCC - 0.2V) o Ultra-Low Power Consumption: 9A Supply Current (typ) o Optimized for Operation from Single-Cell Battery-Powered Systems o Compatible with 3.0V and 5.0V Single-Supply Systems o Low Offset Voltage: 0.2mV o Low Input Bias Current: 5nA o High Open-Loop Voltage Gain: 90dB o Rail-to-Rail Output Stage Drives 5k Load o No Output Phase Reversal for Overdriven Inputs o Available in a Tiny 6-Pin SOT23 (3mm 3mm)
MAX4289
Applications
Single-Cell Systems Portable Electronic Equipment Battery-Powered Instrumentation Hearing Aids Using Zinc Air Battery Strain Gauges Cellular Phones Notebook Computers Sensor Amplifiers Portable Communication Devices
Ordering Information
PART MAX4289EUT-T MAX4289ESA TEMP RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 8 SO TOP MARK AARX --
Typical Operating Characteristic
POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE
90 TA = +85C 80 PSRR (dB)
Pin Configurations
TOP VIEW
OUT
1
6
VCC
N.C. 1 IN- 2
8 7
N.C. VCC OUT N.C.
GND 2
70 TA = -40C
MAX4289
5 N.C.
MAX4289
IN+ 3 6 5 GND 4
IN+ 3
60 TA = +25C
4
IN-
SOT23-6
50 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 SUPPLY VOLTAGE (V)
SO-8
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
1.0V Micropower, SOT23, Operational Amplifier MAX4289
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCC to GND).......................................6V Input Voltage (IN+ or IN-) ...........................(VCC + 0.3V) to -0.3V Input Current (IN+ or IN-)....................................................20mA Output Short-Circuit Duration to VCC or GND ............Continuous Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C).............696mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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
(VCC = 3V, VCM = 0, VOUT = VCC/2, RL tied to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC CONDITIONS Inferred from the PSRR tests VCC = 3.0V VCC = 5.5V Input Offset Voltage Input Bias Current Input Offset Current Differential Input Resistance Input Common-Mode Voltage Range VOS IB IOS RIN VCM Inferred from CMRR test VCC = 1.2V VCC = 3.0V 0 0 57 57 57 54 58 80 85 110 75 75 110 90 0.2 7 0.4 7 10 40 10 40 dB dB mV mV dB TA = +25C TA = TMIN to TMAX 5 0.5 50 VCC - 0.2 VCC - 0.8 TA = +25C TA = -40C to +85C MIN 1.0 1.2 9 12 18 0.2 TYP MAX 5.5 5.5 14 25 40 2.0 6.0 15 2.0 mV nA nA M V A UNITS V
VCC = 1.0V, TA = +25C Quiescent Supply Current ICC
VCC = 1.2V, 0 VCC - 0.2V Common-Mode Rejection Ratio CMRR VCC = 1.2V, 0 VCM VCC - 0.8V VCC = 3.0V, 0 VCM VCC - 0.8V Power-Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing High Output Voltage Swing Low PSRR AVOL VOH VOL 1.0V VCC 5.5V, TA = +25C 1.2V VCC 5.5V, TA = -40C to +85C RL = 100k (50mV VOUT VCC - 50mV) RL = 5k (100mV VOUT VCC - 100mV) Specified as |VCC - VOH| Specified as VOL RL = 100k RL = 5k RL = 100k RL = 5k
2
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1.0V Micropower, SOT23, Operational Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3V, VCM = 0, VOUT = VCC/2, RL tied to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Output Short-Circuit Current Power-Up Time Input Capacitance Gain-Bandwidth Product Phase Margin Gain Margin Slew Rate Capacitive-Load Stability Settling Time to 0.1% tS SYMBOL IOUT tPU CIN GBW M GM SR AVCL = +1V/V, no sustained oscillations AVCL = +1V/V, no sustained oscillations CONDITIONS Sourcing/sinking current VCC = 1.0V VCC = 3.0V MIN TYP 0.6 19 300 3.0 17 80 10 6 200 75 MAX UNITS mA s pF kHz degrees dB V/ms pF s
MAX4289
Note 1: All specifications are 100% production tested at TA = +25C. Temperature specification limits are guaranteed by design.
Typical Operating Characteristics
(VCC = 3V, VCM = 0, RL to VCC/2, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE
MAX4289 toc01 MAX4289 toc02
SUPPLY CURRENT vs. TEMPERATURE
16 14 SUPPLY CURRENT (A) 12 10 8 6 4 2 0 -40 -20 0 60 40 TEMPERATURE (C) 20 80 100 VCC = 1V VCC = 3V 0.8 0.6 INPUT OFFSET VOLTAGE (mV) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0
INPUT OFFSET VOLTAGE vs. TEMPERATURE
0.6 INPUT OFFSET VOLTAGE (mV) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8
MAX4289 toc03
0.8
0.5
1.0
1.5
2.0
2.5
3.0
-40
-20
0
INPUT COMMON-MODE VOLTAGE (V)
20 60 40 TEMPERATURE (C)
80
100
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3
1.0V Micropower, SOT23, Operational Amplifier MAX4289
Typical Operating Characteristics (continued)
(VCC = 3V, VCM = 0, RL to VCC/2, TA = +25C, unless otherwise noted.)
INPUT BIAS CURENT vs. TEMPERATURE
MAX4289 toc04
INPUT BIAS CURRENT vs. INPUT COMMON-MODE VOLTAGE
MAX4289 toc05
OUTPUT SWING HIGH vs. TEMPERATURE
RL CONNECTED TO GND 18 16 14 VOH (mV) 12 10 8 6 RL = 5k
MAX4289 toc06
10 9 INPUT BIAS CURRENT (nA) 8 7 6 5 4 -40 -20 0 20 40 60 80
30
20
INPUT BIAS CURRENT (nA)
20
10
0
4 2 RL = 100k -40 -20 0 20 40 60 80 100
-10 100 0 0.5 1.0 1.5 2.0 2.5 3.0 TEMPERATURE (C) INPUT COMMON-MODE VOLTAGE (V)
0 TEMPERATURE (C)
OUTPUT SWING LOW vs. TEMPERATURE
MAX4289 toc07
OPEN-LOOP GAIN vs. OUTPUT SWING LOW
MAX4289 toc08
OPEN-LOOP GAIN vs. OUTPUT SWING HIGH
RL = 100k 110
MAX4289 toc09
20 18 16 14 VOL (mV) 12 10 8 6 4 2 0 -40
RL CONNECTED TO VCC
130 RL = 100k
130
110
RL = 5k GAIN (dB) GAIN (dB) 90 RL = 5k 70 90 RL = 5k
70
50 RL = 100k 30 -20 0 20 40 60 80 100 0 50 100 150 200 250 300 TEMPERATURE (C) VOUT FROM GND (mV)
50
30 0 50 100 150 200 250 300 VOUT FROM VCC (mV)
OPEN-LOOP GAIN vs. TEMPERATURE
MAX4289 toc10
OPEN-LOOP GAIN vs. TEMPERATURE
MAX4289 toc11
GAIN AND PHASE vs. FREQUENCY (CL = 0)
80 70 60 50 GAIN (dB) GAIN
120 RL = 100k 110 100 GAIN (dB)
120 110 100 GAIN (dB) RL = 100k
MAX4289 toc12
180 160 140 PHASE (DEGREES) 120 100 80 60 PHASE 40 20 0 -20 0.1 1 FREQUENCY (kHz) 10 100
RL = 5k 90 80 70 RL CONNECTED TO GND 60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
RL = 5k 90 80 70 RL CONNECTED TO VCC 60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
40 30 20 10 0 -10 -20 0.01
4
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1.0V Micropower, SOT23, Operational Amplifier
Typical Operating Characteristics (continued)
(VCC = 3V, VCM = 0, RL to VCC/2, TA = +25C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT RESPONSE
MAX4289 toc13
MAX4289
LARGE-SIGNAL TRANSIENT RESPONSE
MAX4289 toc14
MINIMUM-OPERATING VOLTAGE vs. TEMPERATURE
PSRR > 70dB
MAX4289 toc15
1.2
IN 50mV/div
IN 1V/div VCC (V)
1.1
1.0
OUT 50mV/div
OUT 1V/div
0.9
0.8 10s/div 200s/div -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
OUTPUT SINKING CURRENT vs. OUTPUT VOLTAGE
MAX4289 toc16
OUTPUT SINKING CURRENT vs. OUTPUT VOLTAGE
VCC = 3V SINKING CURRENT
MAX4289 toc17
1.5 VCC = 1V SINKING CURRENT 1.2 OUTPUT CURRENT (mA)
25
20 OUTPUT CURRENT (mA)
0.9
15
0.6
10
0.3
5
0 0 0.2 0.4 0.6 0.8 1.0 OUTPUT VOLTAGE (V)
0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
OUTPUT SOURCING CURRENT vs. OUTPUT VOLTAGE
MAX4289 toc18
OUTPUT SOURCING CURRENT vs. OUTPUT VOLTAGE
VCC = 3V SOURCING CURRENT 20 OUTPUT CURRENT (mA)
MAX4289 toc19
1.0 VCC = 1V SOURCING CURRENT 0.8 OUTPUT CURRENT (mA)
25
0.6
15
0.4
10
0.2
5
0 0 0.2 0.4 0.6 0.8 1.0 OUTPUT VOLTAGE (V)
0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
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5
1.0V Micropower, SOT23, Operational Amplifier MAX4289
Pin Description
PIN SO 1, 5, 8 2 3 4 6 7 SOT23 5 4 3 2 1 6 NAME N.C. ININ+ GND OUT VCC FUNCTION No Connection. Not internally connected. Inverting Input Noninverting Input Ground Amplifier Output Positive Supply. Bypass with a 0.1F capacitor to GND.
Detailed Description
The MAX4289 consumes ultra-low power (9A supply current typically) and has a rail-to-rail output stage that is specifically designed for low-voltage operation. The input common-mode voltage range extends from VCC 0.2V to ground, although full rail-to-rail input range is possible with degraded performance. The input offset voltage is typically 200V. Low-operating supply voltage, low supply current, and rail-to-rail outputs make this operational amplifier an excellent choice for precision or general-purpose, low-voltage, battery-powered systems.
IN 500mV/div
Rail-to-Rail Output Stage
The MAX4289 output stage can drive a 5k load and still swing to within 7mV of the rails. Figure 1 shows the output voltage swing of the MAX4289 configured as a unity-gain buffer, powered from a single 2V supply voltage. The output for this setup typically swings from +0.4mV to (VCC - 0.2mV) with a 100k load.
VIN = 2.0V fIN = 1kHz RL = 100k 200s/div
OUT 500mV/div
Figure 1. Rail-to-Rail Input/Output Voltage Range
Applications Information
Power-Supply Considerations
The MAX4289 operates from a single 1.0V to 5.5V supply and consumes only 9A of supply current. A high powersupply rejection ratio of 75dB allows the amplifier to be powered directly off a decaying battery voltage, simplifying design and extending battery life. The MAX4289 is ideally suited for single-cell battery-powered systems. Figures 2 and 3 show the supply current and PSRR as a function of supply voltage and temperature.
SUPPLY CURRENT (A) 25 20
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TA = +85C TA = +25C
15
10 TA = -40C 5
0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V)
Figure 2. ICC vs. VCC Over the Temperature Range
6
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1.0V Micropower, SOT23, Operational Amplifier MAX4289
POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE
90 TA = +85C 80
RISO
PSRR (dB)
70
TA = -40C
MAX4289
RL
CL
60
TA = +25C
50 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
AV = RL 1 RL + RISO
SUPPLY VOLTAGE (V)
Figure 3. PSRR vs. VCC Over the Temperature Range
Figure 4. Using a Resistor to Isolate a Capacitive Load from the Op Amp
Power-Up Settling Time
The MAX4289 typically requires 300s to power-up after VCC is stable. During this startup time, the output is indeterminate. The application circuit should allow for this initial delay.
Power Supplies and Layout
The MAX4289 operates from a single 1V to 5.5V power supply. Bypass the power with a 0.1F capacitor to ground. Good layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp's inputs and outputs. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp's pins.
Driving Capacitive Loads
The MAX4289 is unity-gain stable for loads up to 200pF. Applications that require greater capacitivedrive capability should use an isolation resistor between the output and the capacitive load (Figure 4). Note that this solution results in a loss of gain accuracy because RISO forms a voltage-divider with the load resistor.
Using the MAX4289 as a Comparator
Although optimized for use as an operational amplifier, the MAX4289 can also be used as a rail-to-rail I/O comparator (Figure 5). External hysteresis can be used to minimize the risk of output oscillation. The positive feedback circuit, shown in Figure 5, causes the input threshold to change when the output voltage changes state.
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7
1.0V Micropower, SOT23, Operational Amplifier MAX4289
INPUT VOH
VHI VLO
HYSTERESIS
VOH OUTPUT VOL VIN R1 RHYST VCC VOUT
MAX4289
R2 VEE VEE
Figure 5. Hysteresis Comparator Circuit
Chip Information
TRANSISTOR COUNT: 557
8
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1.0V Micropower, SOT23, Operational Amplifier
Package Information
6LSOT.EPS
MAX4289
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 _____________________ 9 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICN.EPS

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