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________________General Description

The MAX4240–MAX4244 family of micropower op amps

operate from a single +1.8V to +5.5V supply or dual

±0.9V to ±2.75V supplies and have Beyond-the-Rails™

inputs and Rail-to-Rail

output capabilities. These

amplifiers provide a 90kHz gain-bandwidth product

while using only 10µA of supply current per amplifier.

The MAX4241/MAX4243 have a low-power shutdown

mode that reduces supply current to less than 1µA and

forces the output into a high-impedance state. Although

the minimum operating voltage is specified at +1.8V,

these devices typically operate down to +1.5V. The

combination of ultra-low-voltage operation, beyond-the-

rails inputs, rail-to-rail outputs, and ultra-low power con-

sumption makes these devices ideal for any portable/

two-cell battery-powered system.

These amplifiers have an input common-mode range

that extends 200mV beyond each rail, and their outputs

typically swing to within 9mV of the rails with a 100kΩ

load. Beyond-the-rails input and rail-to-rail output char-

acteristics allow the full power-supply voltage to be

used for signal range. The combination of low input off-

set voltage, low input bias current, and high open-loop

gain makes them suitable for low-power/low-voltage

precision applications.

The MAX4240 is offered in a space-saving 5-pin SOT23

package. All specifications are guaranteed over the

-40°C to +85°C extended temperature range.

________________________Applications

Two-Cell Battery- Strain Gauges

Powered Systems

Sensor Amplifiers

Portable/Battery-Powered Cellular Phones

Electronic Equipment

Notebook Computers

Digital Scales PDAs

____________________________Features

♦ Ultra-Low-Voltage Operation:

Guaranteed Down to +1.8V

Typical Operation to +1.5V

♦ Ultra-Low Power Consumption:

10µA Supply Current per Amplifier

1µA Shutdown Mode (MAX4241/MAX4243)

Up to 200,000 Hours Operation from Two AA

Alkaline Cells

♦ Beyond-the-Rails Input Common-Mode Range

♦ Outputs Swing Rail-to-Rail

♦ No Phase Reversal for Overdriven Inputs

♦ 200µV Input Offset Voltage

♦ Unity-Gain Stable for Capacitive Loads up to 200pF

♦ 90kHz Gain-Bandwidth Product

♦ Available in Space-Saving 5-Pin SOT23 and

8-Pin µMAX Packages

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

________________________________________________________________

Maxim Integrated Products

IN-IN+

15V

OUT

MAX4240

SOT23-5

TOP VIEW

_________________Pin Configurations

19-1343; Rev 0; 3/98

PART

MAX4240EUK-T

MAX4241EUA

MAX4241ESA -40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23-5

8 µMAX

8 SO

_______________Ordering Information

Pin Configurations continued at end of data sheet.

_____________________Selector Guide

NO. OF

AMPS

PIN-PACKAGE

MAX4240 1 5-pin SOT23

MAX4241 1 8-pin µMAX/SO

PART

MAX4242 2 8-pin µMAX/SO

SHUTDOWN

—

Yes

—

MAX4243 2

10-pin µMAX,

14-pin SO

MAX4244 4 14-pin SO

Yes

—

Beyond-the-Rails is a trademark of Maxim Integrated Products.

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

MAX4242EUA

MAX4242ESA

MAX4243EUB

-40°C to +85°C

-40°C to +85°C 8 µMAX

8 SO

10 µMAX

MAX4243ESD

MAX4244ESD

-40°C to +85°C

-40°C to +85°C 14 SO

14 SO

SOT

TOP MARK

ACCS

—

Summary of content (16 pages)

PAGE 1
9-1343; Rev 0; 3/98 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps ____________________________Features ♦ Ultra-Low-Voltage Operation: Guaranteed Down to +1.8V Typical Operation to +1.5V These amplifiers have an input common-mode range that extends 200mV beyond each rail, and their outputs typically swing to within 9mV of the rails with a 100kΩ load. Beyond-the-rails input and rail-to-rail output characteristics allow the full power-supply voltage to be used for signal range.
PAGE 2
MAX4240–MAX4244 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ....................................................6V All Other Pins ...................................(VCC + 0.3V) to (VEE - 0.3V) Output Short-Circuit Duration (to VCC or VEE)............Continuous Continuous Power Dissipation (TA = +70°C) 5-pin SOT23 (derate 7.1mW/°C above +70°C).............571mW 8-pin µMAX (derate 4.1mW/°C above +70°C) ..............
PAGE 3
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Power-Supply Rejection Ratio PSRR Large-Signal Voltage Gain AVOL Output Voltage Swing High VOH Output Voltage Swing Low VOL Output Short-Circuit Current IOUT(SC) Output Leakage Current in Shutdown (Notes 2, 5) CONDITIONS 1.8V ≤ VCC ≤ 5.5V (VEE + 0.2V) ≤ VOUT ≤ (VCC - 0.
PAGE 4
MAX4240–MAX4244 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps ELECTRICAL CHARACTERISTICS — TA = +25°C (continued) (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Noise Density en f = 1kHz 70 nV/√Hz Input Current Noise Density in f = 1kHz 0.
PAGE 5
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS VCC = 1.8V Common-Mode Rejection Ratio (Note 4) CMRR VCC = 5.0V Power-Supply Rejection Ratio PSRR Large-Signal Voltage Gain AVOL Output Voltage Swing High VOH 1.8V ≤ VCC ≤ 5.5V (VEE + 0.2V) ≤ VOUT ≤ (VCC - 0.
PAGE 6
ELECTRICAL CHARACTERISTICS — TA = TMIN to TMAX (continued) (VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER SYMBOL SHDN Logic High (Note 2) VIH SHDN Input Bias Current (Note 2) IIH, IIL CONDITIONS MIN TYP MAX UNITS 0.7 x VCC V SHDN = VCC = 5.5V or SHDN = VEE = 0 120 nA Note 1: The MAX4240EUK, MAX4241EUA, MAX4242EUA, and MAX4243EUB specifications are 100% tested at TA = +25°C.
PAGE 7
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps 0 -2.5 RL TO VEE 100 VCC = +1.8V, RL = 10kΩ 80 60 VCC = +5.5V, RL = 20kΩ 40 1.5 0.5 2.5 3.5 4.5 -60 -20 40 20 0 60 VCC = +1.8V, RL = 10kΩ VCC = +5.5V, RL = 100kΩ VCC = +1.8V, RL = 100kΩ 0 80 100 -60 -40 -20 20 0 40 60 100 COMMON-MODE REJECTION vs. TEMPERATURE OPEN-LOOP GAIN vs. OUTPUT SWING LOW (VCC = +1.8V, RL TIED TO VEE) OPEN-LOOP GAIN vs. OUTPUT SWING HIGH (VCC = +1.
PAGE 8
____________________________________Typical Operating Characteristics (continued) (VCC = +5.0V, VEE = 0, VCM = VCC / 2, V SHDN = VCC, RL = 100kΩ to VCC / 2, TA = +25°C, unless otherwise noted.) VCC = +1.8V, RL TO VEE 85 VCC = +1.
PAGE 9
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING) LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING) MAX4240/44-24 MAX4240/44-23 4.5V +2V IN IN 0.5V -2V 2V/div 2V/div 4.5V +2V OUT OUT 0.
PAGE 10
MAX4240–MAX4244 Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps _______________Detailed Description Beyond-the-Rails Input Stage The MAX4240–MAX4244 have Beyond-the-Rails™ inputs and Rail-to-Rail® output stages that are specifically designed for low-voltage, single-supply operation. The input stage consists of separate NPN and PNP differential stages, which operate together to provide a common-mode range extending to 200mV beyond both supply rails.
PAGE 11
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240–MAX4244 In the region where the differential input voltage approaches 1.8V, the input resistance decreases exponentially from 45MΩ to 4.4kΩ as the diode block begins conducting. Conversely, the bias current increases with the same curve. MAX4240-44 fig03 RL = 100kΩ TIED TO VEE VIN = 2.
PAGE 12
Table 1. MAX4240/MAX4241 Characteristics with Typical Battery Systems RECHARGEABLE VFRESH (V) VEND-OF-LIFE (V) CAPACITY, AA SIZE (mA-h) MAX4240/MAX4241 OPERATING TIME IN NORMAL MODE (Hours) MAX4241 OPERATING TIME IN SHUTDOWN MODE (Hours) Alkaline (2 Cells) No 3.0 1.8 2000 200,000 2 x 106 NickelCadmium (2 Cells) Yes 2.4 1.8 750 75,000 0.75 x 106 Lithium-Ion (1 Cell) Yes 3.5 2.7 1000 100,000 106 Nickel-MetalHydride (2 Cells) Yes 2.4 1.
PAGE 13
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps RL = 1.8V - 0.1V = 7kΩ to VEE 240µA and VEE supplies should be bypassed to ground with separate 100nF capacitors. Good PC board layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp’s inputs and output. To decrease stray capacitance, minimize trace lengths by placing external components as close as possible to the op amp. Surface-mount components are an excellent choice.
PAGE 14
Using the MAX4240–MAX4244 as Comparators Using the MAX4240–MAX4244 as Ultra-Low-Power Current Monitors Although optimized for use as operational amplifiers, the MAX4240–MAX4244 can also be used as rail-to-rail I/O comparators. Typical propagation delay depends on the input overdrive voltage, as shown in Figure 9. External hysteresis can be used to minimize the risk of output oscillation.
PAGE 15
Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Amps MAX4240/MAX4241 TRANSISTOR COUNT: 234 MAX4242/MAX4243 R1 VCC TRANSISTOR COUNT: 466 MAX4244 TRANSISTOR COUNT: 932 SUBSTRATE CONNECTED TO VEE R2 Q1 VOUT R3 MAX4240 VEE Figure 11. Current Monitor for a 2-Cell Battery Stack _____________________________________________Pin Configurations (continued) TOP VIEW N.C. 1 IN- 2 8 SHDN 7 VCC MAX4241 3 6 OUT VEE 4 5 N.C.
PAGE 16
__________________________________________________Tape-and-Reel Information D P0 W P2 B0 t D1 F P NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. K0 A0 3.988 ±0.102 40.005 ±0.203 P2 2.007 ±0.051 t 0.254 ±0.127 8.001 +0.305 -0.102 A0 3.200 ±0.102 E 1.753 ±0.102 P0 B0 3.099 ±0.102 F 3.505 ±0.051 P010 D 1.499 +0.102 +0.000 K0 1.397 ±0.102 3.988 ±0.102 0.991 +0.254 +0.