Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp Multi-purpose SC 70 5

General Description

The MAX4291/MAX4292/MAX4294 family of micropow-

er operational amplifiers operates from a 1.8V to 5.5V

single supply or ±0.9V to ±2.75V dual supplies and has

Rail-to-Rail

input/output capabilities. These amplifiers

provide a 500kHz gain-bandwidth product and 120dB

open-loop voltage gain while using only 100µA of sup-

ply current per amplifier. The combination of low input

offset voltage (±200µV) and high open-loop gain makes

them ideal for low-power/low-voltage, high-precision

portable applications.

The MAX4291/MAX4292/MAX4294 have an input com-

mon-mode range that extends to each supply rail, and

their outputs swing to within 46mV of the rails with a 2kΩ

load. Although the minimum operating voltage is speci-

fied at 1.8V, these devices typically operate down to

1.5V. The combination of ultra-low-voltage operation, rail-

to-rail inputs/output, and low-power consumption makes

these devices ideal for any portable/two-cell battery-pow-

ered system.

The single MAX4291 is offered in an ultra-small 5-pin

SC70 package. The dual MAX4292 is offered in a

space-saving 8-bump, 1.5mm X 1.5mm footprint, ultra

chip-scale package (UCSP™).

Applications

2-Cell Battery-Operated Systems

Portable Electronic Equipment

Battery-Powered Instrumentation

Digital Scales

Strain Gauges

Sensor Amplifiers

Cellular Phones

Features

♦ Ultra-Low Voltage Operation—Guaranteed Down

to 1.8V

♦ 100µA Supply Current per Amplifier

♦ 500kHz Gain-Bandwidth Product

♦ 120dB Open-Loop Voltage Gain (R

= 100kΩ)

♦ 0.017% Total Harmonic Distortion Plus Noise

(THD + N) at 1kHz

♦ Rail-to-Rail Input Common-Mode Range

♦ Rail-to-Rail Output Drives 2kΩ Load

♦ No Phase Reversal for Overdriven Inputs

♦ Unity-Gain Stable for Capacitive Loads up to 100pF

♦ 200µV Input Offset Voltage (MAX4292/MAX4294)

♦ Single in Small 5-Pin SC70

♦ Available in Ultra-Small Packages:

5-Pin SC70 (MAX4291)

8-Bump UCSP (MAX4292)

MAX4291/MAX4292/MAX4294

Ultra-Small, 1.8V, µPower,

Rail-to-Rail I/O Op Amps

________________________________________________________________ Maxim Integrated Products 1

19-1612; Rev 3; 4/02

Pin Configurations

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

UCSP is a trademark of Maxim Integrated Products, Inc.

Ordering Information

Selector Guide

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.

PART AMPLIFIERS PIN-PACKAGE

MAX4291 1

5-pin SC70/SOT23

MAX4292 2

8-pin µMAX/SO/UCSP

MAX4294 4

14-pin SO/TSSOP

TOP VIEW

(BUMPS ON BOTTOM)

OUTA

OUTB

INA-

INA+

INB-

INB+

UCSP

MAX4292

Pin Configurations continued at end of data sheet.

*UCSP reliability is integrally linked to the user’s assembly

methods, circuit board material, and environment. Refer to the

UCSP Reliability Notice in the UCSP Reliability section of this

data sheet for more information.

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4291EXK-T -40°C to +85°C

5 SC70-5 AAD

MAX4291EUK-T -40°C to +85°C

5 SOT23-5 ADML

MAX4292EBL-T* -40°C to +85°C

8 UCSP-8 AAJ

MAX4292EUA -40°C to +85°C

8 µMAX —

MAX4292ESA -40°C to +85°C

8 SO —

MAX4294ESD -40°C to +85°C

14 SO —

MAX4294EUD -40°C to +85°C

14 TSSOP —

Summary of content (18 pages)

PAGE 1
9-1612; Rev 3; 4/02 Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps The MAX4291/MAX4292/MAX4294 family of micropower operational amplifiers operates from a 1.8V to 5.5V single supply or ±0.9V to ±2.75V dual supplies and has Rail-to-Rail® input/output capabilities. These amplifiers provide a 500kHz gain-bandwidth product and 120dB open-loop voltage gain while using only 100µA of supply current per amplifier.
PAGE 2
MAX4291/MAX4292/MAX4294 Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ....................................................6V All Other Pins ...................................(VCC + 0.3V) to (VEE - 0.3V) Current into IN_+, IN_- .....................................................±25mA Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SC70 (derate 2.5mW/°C above +70°C) .....
PAGE 3
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps (VCC = 1.8V to 5.5V, VEE = VCM = 0, VOUT = VCC/2, RL = 100kΩ connected to VCC/2, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP RL = 100kΩ, 0.02V ≤ VOUT ≤ VCC - 0.02V 80 120 RL = 2kΩ, 0.1V ≤ VOUT ≤ VCC - 0.1V 80 110 MAX UNITS VCC = 1.8V Large-Signal Voltage Gain AV dB RL = 100kΩ, 0.02V ≤ VOUT ≤ VCC - 0.02V 80 130 RL = 2kΩ, 0.1V ≤ VOUT ≤ VCC - 0.1V 80 120 VCC = 5.
PAGE 4
MAX4291/MAX4292/MAX4294 Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps ELECTRICAL CHARACTERISTICS (continued) (VCC = 1.8V to 5.5V, VEE = VCM = 0, VOUT = VCC/2, RL = 100kΩ connected to VCC/2, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER Input Offset Voltage Drift SYMBOL CONDITIONS MIN TCVOS TYP MAX 1.2 UNITS µV/°C IB VCC = 5.0V, 0 ≤ VCM ≤ 5.0V ±90 nA Input Offset Current IOS VCC = 5.0V, 0 ≤ VCM ≤ 5.
PAGE 5
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE VCC = 5.5V 120 110 100 90 VCC = 1.8V 80 1.7 1.6 1.5 1.4 1.3 1.2 VCC = 5.5V -300 -450 VCC = 2.4V -600 VCC = 1.8V -900 -55 -40 -25 -10 5 20 35 50 65 80 95 110 125 -55 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) INPUT BIAS CURRENT vs. TEMPERATURE INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE (VCC = 1.8V) INPUT BIAS CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = 2.4V, VEE = VCM = 0, VOUT = VCC/2, no load, TA = +25°C, unless otherwise noted.) OPEN-LOOP GAIN vs. OUTPUT SWING HIGH (VCC = 1.8V, RL CONNECTED TO VEE) RL = 1kΩ RL = 2kΩ 110 RL = 1kΩ 110 90 RL = 1kΩ GAIN (dB) 100 90 80 70 0 50 0 50 100 150 200 250 300 350 400 450 500 50 100 150 200 250 300 350 400 450 500 VOH (mV) VOL (mV) OPEN-LOOP GAIN vs. OUTPUT SWING HIGH (VCC = 5.5V, RL CONNECTED TO VEE) OPEN-LOOP GAIN vs.
PAGE 7
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING CONFIGURATION) LOAD RESISTOR vs. CAPACITIVE LOAD 10% OVERSHOOT AV = 1V/V (NONINVERTING CONFIGURATION) MAX4291 toc19 100 VCC = 2.5V VEE = -2.5V VCM = 0 MAX4291 toc21 VCC = 2.5V VEE = -2.5V VCM = 0 100mV 100mV 10 IN IN 0 0 100mV 100mV VCC = 5.5V 1 VCC = 2.4V 0.1 IOUT > 20mA VCC = 5.5V OUT IOUT > 20mA VCC = 2.4V OUT 0 0 0.
PAGE 8
MAX4291/MAX4292/MAX4294 Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps Pin Description PIN MAX4291 MAX4292 MAX4294 NAME FUNCTION µMAX/SO UCSP 1 — — — IN+ Noninverting Input 2 4 C2 11 VEE Negative Supply. Connect to ground for single-supply operation.
PAGE 9
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps MAX4291/MAX4292/MAX4294 Table 1. MAX4291 Characteristics with Typical Battery Systems VEND-OF-LIFE (V) CAPACITY, AA SIZE (mA-h) MAX4291 OPERATING TIME IN NORMAL MODE (h) 3.0 1.8 2000 20,000 Yes 2.4 1.8 750 7500 Lithium-Ion (1 cell) Yes 3.5 2.7 1000 10,000 Nickel-MetalHydride (2 cells) Yes 2.4 1.8 1000 10,000 BATTERY TYPE RECHARGEABLE VFRESH (V) Alkaline (2 cells) No Nickel-Cadmium (2 cells) IN+ VCC = 2.5V, VEE = -2.5V 10.
PAGE 10
MAX4291 OFFSET VOLTAGE vs. SUPPLY VOLTAGE -450 30 -550 TA = +25°C -600 TA = -40°C -650 OUTPUT SOURCE CURRENT (mA) -500 OFFSET VOLTAGE (µV) OUTPUT SOURCE CURRENT vs. TEMPERATURE VCM = VCC/2 TA = +85°C -700 25 20 15 10 VCC = 1.8V VOH = 200mV VCC = 5.5V VOH = 100mV VCC = 5.5V VOH = 50mV VCC = 1.8V VOH = 100mV VCC = 1.8V VOH = 50mV 0 -55 -40 -25 -10 5 20 35 50 65 80 95 110 125 SUPPLY VOLTAGE (V) TEMPERATURE (°C) Figure 6a. Output Source Current vs. Temperature OUTPUT SINK CURRENT vs.
PAGE 11
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps IN RISO 0 OUT IN MAX4291 MAX4292 MAX4294 RL CL 100mV OUT 0 AV = RL ≈1 RL + RISO Figure 7a. Using a Resistor to Isolate a Capacitive Load from the Op Amp 100mV IN 0 100mV OUT 0 10µs/div VCC = 2.4V, RL = 2kΩ TO VEE, CL = 1000pF Figure 7b. Pulse Response Without Isolating Resistor within 100mV of VCC and is capable of driving a 485Ω load resistor to VEE: RL = (1.8V − 0.1V) = 485Ω to VEE 3.
PAGE 12
PROPAGATION DELAY vs. INPUT OVERDRIVE 1000 HYSTERESIS VHI INPUT VLO VOH tPD+, VCC = 5.5V OUTPUT VOL tPD (µs) VSIG tPD-, VCC = 5.5V 100 RHYST R1 tPD-, VCC = 1.8V tPD+, VCC = 1.8V VCC VOUT MAX4291 R2 VREF 10 0 10 20 30 40 50 60 MAX4294 VEE = GND VOD (mV) Figure 8. Propagation Delay vs. Input Overdrive VHYST = VHI − VLO  R1 R1  VHI = 1 + +  VREF R2 RHYST    R1  VLO = VHI −   VCC  RHYST  When the output of the comparator is low, the supply current increases.
PAGE 13
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps ILOAD R1 VCC UCSP Information Layout Issues Design the layout for the IC to be as compact as possible to minimize parasitics. The UCSP uses a bump pitch of 0.5mm (19.7mil) and bump diameter of 0.3 (~12mil). Therefore, lay out the solder-pad spacing on 0.5mm (19.7mil) centers, using a pad size of 0.25mm (~10mil) and a solder mask opening of 0.33mm (13mil). Round or square pads are permissible.
PAGE 14
MAX4291/MAX4292/MAX4294 Ultra-Small, 1.
PAGE 15
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps SOT5L.EPS SC70, 5L.EPS ______________________________________________________________________________________ 15 MAX4291/MAX4292/MAX4294 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 16
Package Information (continued) 4X S 8 E ÿ 0.50±0.1 8 INCHES DIM A A1 A2 b H c D e E H 0.6±0.1 1 L 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.EPS (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MILLIMETERS MAX MIN 0.05 0.75 1.10 0.
PAGE 17
Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps SOICN.EPS ______________________________________________________________________________________ 17 MAX4291/MAX4292/MAX4294 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 18
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 9LUCSP, 3x3.EPS MAX4291/MAX4292/MAX4294 Ultra-Small, 1.8V, µPower, Rail-to-Rail I/O Op Amps Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.