Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Comparator + voltage ref circuit CMOS, Push pull, Rail-to-rail, TTL SOIC 8 N

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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

MAX917–MAX920

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

Comparators With/Without Reference

________________________________________________________________ Maxim Integrated Products 1

IN- (REF)

IN+

OUT

MAX917

MAX918

MAX919

MAX920

SOT23

TOP VIEW

( ) ARE FOR MAX917/MAX918.

PART PIN-PACKAGE

TOP

MARK

PKG

CODE

MAX917EUK+T 5 SOT23

ADIQ

U5+1

MAX917ESA+ 8 SO

—

S8+2

MAX918EUK+T 5 SOT23

ADIR

U5+1

MAX918ESA+ 8 SO

—

S8+2

MAX919EUK+T 5 SOT23

ADIS

U5+1

MAX919EUK/V+T 5 SOT23

AFGP

U5+1

MAX919ESA+ 8 SO

—

S8+2

MAX920EUK+T 5 SOT23

ADIT

U5+1

MAX920ESA+ 8 SO

—

S8+2

Pin Configurations continue at end of data sheet.

Typical Application Circuit appears at end of data sheet.

Pin Configurations

Selector Guide

Ordering Information

Open-DrainYesMAX918 750

380

750

SUPPLY

CURRENT

(nA)

Open-DrainNoMAX920

PART

Push-PullNoMAX919

Push-PullYesMAX917

OUTPUT

TYPE

INTERNAL

REFERENCE

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

19-1512; Rev 2; 10/10

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

temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Summary of content (15 pages)

PAGE 1
9-1512; Rev 2; 10/10 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference The MAX917–MAX920 nanopower comparators in space-saving SOT23 packages feature Beyond-theRails™ 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 (without reference) require just 380nA of supply current.
PAGE 2
MAX917–MAX920 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE)..................................................+6V Voltage Inputs (IN+, IN-, REF) .........(VEE - 0.3V) to (VCC + 0.3V) Current Into Input Pins......................................................±20mA Output Voltage MAX917/MAX919 ........................(VEE - 0.3V) to (VCC + 0.3V) MAX918/MAX920 ......................................(VEE - 0.
PAGE 3
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference MAX917–MAX920 ELECTRICAL CHARACTERISTICS—MAX917/MAX918 (continued) (VCC = +5V, VEE = 0V, VIN+ = VREF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER High-to-Low Propagation Delay (Note 4) SYMBOL tPD- CONDITIONS TYP 17 VCC = 5V 22 MAX917 only Low-to-High Propagation Delay (Note 4) MIN VCC = 1.8V tPD+ MAX918 only VCC = 1.8V 30 VCC = 5V 95 VCC = 1.
PAGE 4
MAX917–MAX920 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference ELECTRICAL CHARACTERISTICS—MAX919/MAX920 (continued) (VCC = +5V, VEE = 0V, VCM = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Offset Current SYMBOL CONDITIONS IOS MIN TYP MAX UNITS 10 pA Power-Supply Rejection Ratio PSRR VCC = 1.8V to 5.5V 0.1 1 mV/V Common-Mode Rejection Ratio CMRR (VEE - 0.2V) ≤ VCM ≤ (VCC + 0.2V) 0.
PAGE 5
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference TA = +25°C 700 TA = -40°C 600 MAX917-920 toc02 800 600 MAX917/MAX918 SUPPLY CURRENT vs. TEMPERATURE TA = +85°C 500 TA = +25°C 400 900 850 SUPPLY CURRENT (nA) SUPPLY CURRENT (nA) TA = +85°C SUPPLY CURRENT (nA) MAX917-920 toc01 900 MAX919/MAX920 SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE MAX917-920 toc03 MAX917/MAX918 SUPPLY CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) TA = +25°C TA = +85°C 0.3 0.2 TA = -40°C 0.1 80 60 VCC = 3V 40 0 2 4 6 8 80 60 VCC = 3V 40 0 -15 10 35 60 85 VCC = 1.8V -40 -15 10 35 60 85 SOURCE CURRENT (mA) TEMPERATURE (°C) TEMPERATURE (°C) OFFSET VOLTAGE vs. TEMPERATURE HYSTERESIS VOLTAGE vs. TEMPERATURE MAX917/MAX918 REFERENCE VOLTAGE vs. TEMPERATURE VHB (mV) 0.07 VCC = 3V 0.06 4.0 3.
PAGE 7
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference MAX917/MAX919 PROPAGATION DELAY (tPD+) vs. TEMPERATURE tPD+ (μs) VCC = 3V 10 VCC = 3V 60 VCC = 1.8V 20 -15 10 35 60 85 -40 60 85 0.1 1 10 100 CAPACITIVE LOAD (nF) MAX917/MAX919 PROPAGATION DELAY (tPD+) vs. CAPACITIVE LOAD PROPAGATION DELAY (tPD-) vs. INPUT OVERDRIVE MAX917/MAX919 PROPAGATION DELAY (tPD+) vs. INPUT OVERDRIVE VCC = 3V 100 MAX917-920 toc23 70 MAX917-920 toc22 120 VCC = 1.
PAGE 8
MAX917–MAX920 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0V, CL = 15pF, VOVERDRIVE = 100mV, TA = +25°C, unless otherwise noted.) MAX917/MAX919 PROPAGATION DELAY (tPD+) (VCC = 5V) MAX917-920 toc29 MAX917-920 toc28 MAX917-920 toc30 IN+ (50mV/ div) IN+ (50mV/ div) OUT (2V/div) IN+ (50mV/ div) OUT (2V/div) OUT (2V/div) 20μs/div 20μs/div 20μs/div PROPAGATION DELAY (tPD-) (VCC = 1.
PAGE 9
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference VCC VCC IN+ IN+ OUT OUT REF IN- MAX919 MAX920 MAX917 MAX918 REF 1.245V VEE VEE Pin Description PIN MAX917/MAX918 MAX919/MAX920 NAME FUNCTION SOT23-5 SO SOT23-5 SO 1 6 1 6 OUT Comparator Output 2 4 2 4 VEE Negative Supply Voltage 3 3 3 3 IN+ Comparator Noninverting Input — — 4 2 IN- Comparator Inverting Input 4 2 — — REF 1.
PAGE 10
MAX917–MAX920 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Output Stage Circuitry The MAX917–MAX920 contain a unique break-beforemake output stage capable of rail-to-rail operation with up to ±8mA loads. Many comparators consume orders of magnitude more current during switching than during steady-state operation. However, with this family of comparators, the supply-current change during an output transition is extremely small.
PAGE 11
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference MAX917–MAX920 VCC THRESHOLDS IN+ R3 VTHR R1 HYSTERESIS INVHB VIN VCC BAND R2 OUT VEE VTHF MAX917 MAX919 VREF OUT Figure 2. Threshold Hysteresis Band Additional Hysteresis (MAX917/MAX919) The MAX917/MAX919 have a 4mV internal hysteresis band (VHB). Additional hysteresis can be generated with three resistors using positive feedback (Figure 3). Unfortunately, this method also slows hysteresis response time.
PAGE 12
MAX917–MAX920 SOT23, 1.
PAGE 13
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SO S8+2 21-0041 90-0096 SOT23 U5+1 21-0057 90-0174 SOT-23 5L .EPS PACKAGE TYPE ______________________________________________________________________________________ 13 MAX917–MAX920 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.
PAGE 14
MAX917–MAX920 SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference Package Information (continued) 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.
PAGE 15
SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference REVISION NUMBER REVISION DATE 2 10/10 DESCRIPTION Added lead-free and automotive qualified parts PAGES CHANGED 1, 2 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.