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General Description

The MAX917–MAX920 nanopower comparators in

space-saving SOT23 packages feature Beyond-the-

Rails™ inputs and are guaranteed to operate down to

+1.8V. The MAX917/MAX918 feature an on-board

1.245V ±1.5% reference and draw an ultra-low supply

current of only 750nA, while the MAX919/MAX920 (with-

out reference) require just 380nA of supply current.

These features make the MAX917–MAX920 family of

comparators ideal for all 2-cell battery applications,

including monitoring/management.

The unique design of the output stage limits supply-cur-

rent surges while switching, virtually eliminating the

supply glitches typical of many other comparators. This

design also minimizes overall power consumption

under dynamic conditions. The MAX917/MAX919 have

a push-pull output stage that sinks and sources current.

Large internal output drivers allow rail-to-rail output

swing with loads up to 8mA. The MAX918/MAX920

have an open-drain output stage that makes them suit-

able for mixed-voltage system design.

Applications

2-Cell Battery Monitoring/Management

Ultra-Low-Power Systems

Mobile Communications

Notebooks and PDAs

Threshold Detectors/Discriminators

Sensing at Ground or Supply Line

Telemetry and Remote Systems

Medical Instruments

Features

♦ Ultra-Low Supply Current

380nA per Comparator (MAX919/MAX920)

750nA per Comparator with Reference

(MAX917/MAX918)

♦ Guaranteed to Operate Down to +1.8V

♦ Internal 1.245V ±1.5% Reference

(MAX917/MAX918)

♦ Input Voltage Range Extends 200mV

Beyond-the-Rails

♦ CMOS Push-Pull Output with ±8mA Drive

Capability (MAX917/MAX919)

♦ Open-Drain Output Versions Available

(MAX918/MAX920)

♦ Crowbar-Current-Free Switching

♦ Internal Hysteresis for Clean Switching

♦ No Phase Reversal for Overdriven Inputs

♦ Space-Saving SOT23 Package

SOT23, 1.8V, Nanopower, Beyond-the-Rails

Comparators With/Without Reference

________________________________________________________________ Maxim Integrated Products

1

IN- (REF)

IN+

1

5

OUT

MAX917

MAX918

MAX919

MAX920

SOT23-5

TOP VIEW

2

3

4

( ) ARE FOR MAX917/MAX918.

PART

PIN-PACKAGE

TOP

MARK

PKG

CODE

MAX917EUK-T

5 SOT23-5

ADIQ

U5-1

MAX917ESA

8 SO

—

S8-4

MAX918EUK-T

5 SOT23-5

ADIR

U5-1

MAX918ESA

8 SO

—

S8-4

MAX919EUK-T

5 SOT23-5

ADIS

U5-1

MAX919ESA

8 SO

—

S8-4

MAX920EUK-T

5 SOT23-5

ADIT

U5-1

MAX920ESA

8 SO

—

S8-4

Pin Configurations continue at end of data sheet.

Typical Application Circuit appears at end of data sheet.

Pin Configurations

Selector Guide

Ordering Information

Open-Drain

Yes

MAX918

750

380

380

750

SUPPLY

CURRENT

(nA)

Open-Drain

No

MAX920

PART

Push-Pull

No

MAX919

Push-Pull

Yes

MAX917

OUTPUT

TYPE

INTERNAL

REFERENCE

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

19-1512; Rev 1; 1/07

Note: All devices are specified over the -40°C to +85°C operating

temperature range.