MAXIM MAX917, MAX920 User Manual

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

General Description

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. 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-current 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 suitable 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

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.

PART PIN-PACKAGE

MAX917EUK+T 5 SOT23

MAX917ESA+ 8 SO

MAX918EUK+T 5 SOT23

MAX918ESA+ 8 SO

MAX919EUK+T 5 SOT23

MAX919EUK/V+T 5 SOT23

MAX919ESA+ 8 SO

MAX920EUK+T 5 SOT23

MAX920ESA+ 8 SO

TOP

MARK

ADIQ

—

ADIR

—

ADIS

AFGP

—

ADIT

—

PKG

CODE

U5+1

S8+2

U5+1

S8+2

U5+1

S8+2

U5+1

S8+2

TOP VIEW

OUT

IN+

MAX917

MAX918 MAX919 MAX920

IN- (REF)

( ) ARE FOR MAX917/MAX918.

SOT23

MAX917–MAX920

SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX917/MAX918

(VCC= +5V, VEE= 0V, V

IN+

= V

REF

, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

Supply Voltage (VCCto VEE)..................................................+6V

Voltage Inputs (IN+, IN-, REF) .........(V

- 0.3V) to (VCC+ 0.3V)

Current Into Input Pins......................................................±20mA

Output Voltage

MAX917/MAX919 ........................(V

- 0.3V) to (VCC+ 0.3V)

MAX918/MAX920 ......................................(VEE- 0.3V) to +6V

Output Current..................................................................±50mA

Output Short-Circuit Duration .............................................10sec

Continuous Power Dissipation (T

= +70°C)

5-Pin SOT23 (derate 7.31mW/°C above +70°C).........571mW

8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

= 1.8V

VCC= 1.8V

VCC= 5V

VCC= 1.8V

VCC= 5V

Output-Voltage Swing Low V

190 400

500

55 200

TA= T

MIN

to T

MAX

TA= +25°C

300

VCC= 5V, I

SINK

= 8mA

TA= T

MIN

to T

MAX

VCC= 1.8V, I

SINK

= 1mA

TA= +25°C

TA= T

MIN

to T

MAX

TA= +25°C

TA= T

MIN

to T

MAX

TA= +25°C

TA= T

MIN

to T

MAX

TA= +25°C

TA= T

MIN

to T

MAX

TA= +25°C

TA= T

MIN

to T

MAX

TA= +25°C

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Offset Voltage V

IN+ Voltage Range V

IN+

VEE- 0.2 V

+ 0.2 V

1.60

Input-Referred Hysteresis V

4 mV

Input Bias Current I

0.15 1 nA

Power-Supply Rejection Ratio PSRR 0.1 1 mV/V

Supply Current

Supply Voltage Range V

1.8 5.5 V

0.75

µA

0.80 1.30

Output-Voltage Swing High VCC- V

190 400

500

55 200

300

Output Leakage Current I

LEAK

0.001 1 µA

Output Short-Circuit Current I

CONDITIONS

MAX917 only, VCC= 5V, I

SOURCE

= 8mA

(Note 2)

Inferred from the output swing test

(Note 3)

MAX917 only, VCC=

1.8V, I

SOURCE

= 1mA

= 1.8V to 5.5V

MAX918 only, VO= 5.5V

Sourcing, VO= V

Inferred from the PSRR test

Sinking, VO= V

VCC= 5V

MAX917–MAX920

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

Comparators With/Without Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX919/MAX920

(VCC= +5V, VEE= 0V, VCM= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

= 1.8V

VCC= 5V

Inferred from the PSRR test

-0.2V ≤ VCM≤ (VCC+ 0.2V) (Note 3)

TA= +25°C

Inferred from the CMRR test

-0.2V ≤ VCM≤ (VCC+ 0.2V) (Note 2)

TA= +25°C

CONDITIONS

TA= T

MIN

to T

MAX

0.45 0.80

µA

0.38

V1.8 5.5V

Supply Voltage Range

Supply Current

0.15 1

Input Bias Current

mV4V

Input-Referred Hysteresis

1.2

TA= +25°C

VVEE- 0.2 V

+ 0.2V

Input Common-Mode Voltage Range

Input Offset Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= T

MIN

to T

MAX

2TA= T

MIN

to T

MAX

= 5V,

PULLUP

= 100kΩ

= 1.8V,

PULLUP

= 100kΩ

= 5V

= 1.8V

MAX917 only

µs

PD+

Low-to-High Propagation Delay (Note 4)

MAX918 only

120

µs

CONDITIONS

TA = +25°C

ms1.2

PD-

High-to-Low Propagation Delay (Note 4)

Power-Up Time

ΔI

OUT

= 10nA mV/nA±0.2

ΔV

REF

ΔI

OUT

Reference Load Regulation

UNITS

MIN TYP MAXSYMBOL

PARAMETER

CL= 15pF

1.8V ≤ VCC≤ 5.5V

BW = 10Hz to 100kHz, C

REF

= 1nF

MAX917 only, CL= 15pF

= 5V

BW = 10Hz to 100kHz

TA = T

MIN

to T

MAX

mV/V0.1

ΔV

REF

ΔV

Reference Line Regulation

215

µV

RMS

Reference Output Voltage Noise

1.200 1.290

1.227 1.245 1.263

REF

Reference Voltage

µs4t

FALL

Fall Time

µs6t

RISE

Rise Time

ppm/°CTC

REF

Reference Voltage Temperature Coefficient

600

ELECTRICAL CHARACTERISTICS—MAX917/MAX918 (continued)

(VCC= +5V, VEE= 0V, V

IN+

= V

REF

, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

MAX917–MAX920

SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference

4 _______________________________________________________________________________________

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)

Note 1: All specifications are 100% tested at T

= +25°C. Specification limits over temperature (TA= T

MIN

to T

MAX

) are guaranteed

by design, not production tested.

Note 2: V

is defined as the center of the hysteresis band at the input.

Note 3: The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the center of

the band (i.e., V

) (Figure 2).

Note 4: Specified with an input overdrive (V

OVERDRIVE

) of 100mV, and load capacitance of CL= 15pF. V

OVERDRIVE

is defined above and beyond the offset voltage and hysteresis of the comparator input. For the MAX917/MAX918, reference voltage error should also be added.

Sinking, VO= V

Sourcing, VO= V

MAX920 only, VO= 5.5V

TA= +25°C

MAX919 only, VCC=

1.8V, I

SOURCE

= 1mA

TA= T

MIN

to T

MAX

VCC= 1.8V, I

SINK

= 1mA

MAX919 only, VCC= 5V, I

SOURCE

= 8mA

CONDITIONS

ms1.2

Power-Up Time

Output Short-Circuit Current

µA0.001 1I

LEAK

Output Leakage Current

TA= T

MIN

to T

MAX

300

TA= +25°C

TA= T

MIN

to T

MAX

VCC= 5V, I

SINK

= 8mA

55 200

300

TA= +25°C

TA= T

MIN

to T

MAX

500

55 200

500

190 400

VCC- V

Output-Voltage Swing High

pA10I

Input Offset Current

190 400

Output-Voltage Swing Low

VCC= 5V

VCC= 1.8V

VCC= 5V

VCC= 1.8V

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX919 only, CL= 15pF µs6t

RISE

High-to-Low Propagation Delay (Note 4)

Rise Time

µs

PD-

= 1.8V to 5.5V mV/V0.1 1PSRRPower-Supply Rejection Ratio

(VEE- 0.2V) ≤ VCM≤ (VCC+ 0.2V) mV/V0.5 3CMRRCommon-Mode Rejection Ratio

VCC= 1.8V

VCC= 5V

MAX919 only

Low-to-High Propagation Delay (Note 4)

µs

PD+

VCC= 5V

VCC= 1.8V

MAX920 only

VCC= 1.8V R

PULLUP

= 100kΩ

VCC= 5V R

PULLUP

= 100kΩ

120

CL= 15pF µs4t

FALL

Fall Time

MAX917–MAX920

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

Comparators With/Without Reference

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(VCC= +5V, V

= 0V, CL= 15pF, V

OVERDRIVE

= 100mV, TA= +25°C, unless otherwise noted.)

MAX917/MAX918

SUPPLY CURRENT vs.

SUPPLY VOLTAGE AND TEMPERATURE

900

TA = +85°C

800

TA = +25°C

700

SUPPLY CURRENT (nA)

TA = -40°C

600

500

1.5 2.5 3.5 4.52.0 3.0 4.0 5.0 5.5 SUPPLY VOLTAGE (V)

MAX919/MAX920

SUPPLY CURRENT vs. TEMPERATURE

550

500

450

400

SUPPLY CURRENT (nA)

350

300

VCC = 5V

VCC = 3V

VCC = 1.8V

-40 -15 10 35 60 85

TEMPERATURE (°C)

MAX917-920 toc01

MAX917-920 toc04

MAX919/MAX920

SUPPLY CURRENT vs.

SUPPLY VOLTAGE AND TEMPERATURE

600

500

400

SUPPLY CURRENT (nA)

300

TA = +85°C

TA = +25°C

TA = -40°C

1.5 2.5 3.5 4.52.0 3.0 4.0 5.0 5.5 SUPPLY VOLTAGE (V)

MAX917/MAX918

SUPPLY CURRENT vs.

OUTPUT TRANSITION FREQUENCY

SUPPLY CURRENT (μA)

1 10 100 1k 10k 100k

OUTPUT TRANSITION FREQUENCY (Hz)

VCC = 5V

VCC = 1.8V

MAX917-920 toc02

MAX917-920 toc05

VCC = 3V

SUPPLY CURRENT vs. TEMPERATURE

MAX917/MAX918

900

850

800

750

700

650

SUPPLY CURRENT (nA)

600

550

500

-40 -15 10 35 60 85

VCC = 5V

VCC = 3V

VCC = 1.8V

TEMPERATURE (°C)

MAX919/MAX920

SUPPLY CURRENT vs.

OUTPUT TRANSITION FREQUENCY

SUPPLY CURRENT (μA)

1 10 100 1k 10k 100k

OUTPUT TRANSITION FREQUENCY (Hz)

VCC = 5V

MAX917-920 toc03

MAX917-920 toc06

VCC = 3V

VCC = 1.8V

OUTPUT-VOLTAGE LOW vs. SINK CURRENT

450

400

350

300

250

(mV)

200

150

100

VCC = 1.8V

0682 4 10 12 14 16

VCC = 3V

SINK CURRENT (mA)

VCC = 5V

MAX917-920 toc07

OUTPUT-VOLTAGE LOW vs. SINK CURRENT

AND TEMPERATURE

600

500

400

(mV)

300

TA = +85°C

200

100

0682 4 10 12 14 16

TA = +25°C

SINK CURRENT (mA)

TA = -40°C

MAX917-920 toc08

OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT

MAX917/MAX919

(V)

- V

0.6

0.5

0.4

0.3

0.2

0.1

VCC = 1.8V

VCC = 3V

0862 4 10 12 14 16 18 20

SOURCE CURRENT (mA)

VCC = 5V

MAX917-920 toc09

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