Rainbow Electronics MAX920 User Manual

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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

PART

MAX917EUK-T

MAX917ESA -40°C to +85°C

-40°C to +85°C

TEMP.

RANGE

PIN-

PACKAGE

5 SOT23-5
8 SO

Pin Configurations continue at end of data sheet.

Typical Application Circuit appears at end of data sheet.

Pin Configurations

Selector Guide

Ordering Information

SOT

TOP MARK

ADIQ

—

MAX918EUK-T
MAX918ESA

ADIR

-40°C to +85°C

-40°C to +85°C 5 SOT23-5
8 SO —

MAX919EUK-T
MAX919ESA

ADIS

-40°C to +85°C

-40°C to +85°C 5 SOT23-5
8 SO —

MAX920EUK-T
MAX920ESA

ADIT

-40°C to +85°C

-40°C to +85°C 5 SOT23-5
8 SO —

Open-DrainYesMAX918 750

380

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

19-1512; Rev 0; 7/99

TOP VIEW

1

OUT

MAX917

2

V

EE

IN+

( ) ARE FOR MAX917/MAX918.

MAX918
MAX919
MAX920

3

SOT23-5

5

4

V

CC

IN- (REF)

MAX917–MAX920

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX917/MAX918

(VCC= +5V, VEE= 0, 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) .........(VEE- 0.3V) to (VCC+ 0.3V)

Output Voltage

MAX917/MAX919........................(VEE- 0.3V) to (VCC+ 0.3V)

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

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

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

Continuous Power Dissipation (TA= +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, 10sec) .............................+300°C

V

CC

= 1.8V

VCC= 1.8V

VCC= 5V

VCC= 1.8V

VCC= 5V

Output Voltage Swing Low V

OL

190 400

mV

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

10

Input Offset Voltage V

OS

15

mV

IN+ Voltage Range V

IN+

VEE- 0.2 V

CC

+ 0.2 V

1.60

Input-Referred Hysteresis V

HB

4 mV

Input Bias Current I

B

0.15 1
nA

2

Power-Supply Rejection Ratio PSRR 0.1 1 mV/V

Supply Current

Supply Voltage Range V

CC

1.8 5.5 V

I

CC

0.75
µA

0.80 1.30

Output Voltage Swing High VCC- V

OH

190 400

mV

500

55 200

300

Output Leakage Current I

LEAK

0.001 1 µA

Output Short-Circuit Current I

SC

95

mA

8
98
10

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

V

CC

= 1.8V to 5.5V

MAX918 only, VO= 5.5V

Sourcing, VO= V

EE

Inferred from the PSRR test

Sinking, VO= V

CC

VCC= 5V

MAX917–MAX920

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

Comparators With/Without Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX919/MAX920

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

V

CC

= 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

I

CC

V1.8 5.5V

CC

Supply Voltage Range

Supply Current

nA

0.15 1

I

B

Input Bias Current

mV4V

HB

Input-Referred Hysteresis

1.2

TA= +25°C

VVEE- 0.2 V

CC

+ 0.2V

CM

Input Common-Mode
Voltage Range

mV

15

V

OS

Input Offset Voltage

10

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= T

MIN

to T

MAX

2TA= T

MIN

to T

MAX

V

CC

= 5V,

R

PULL-UP

= 100kΩ

V

CC

= 1.8V,

R

PULL-UP

= 100kΩ

V

CC

= 5V

V

CC

= 1.8V

V

CC

= 1.8V

MAX917 only

95

µs

30

t

PD+

Low-to-High Propagation Delay
(Note 4)

35

MAX918 only

120

µs

95

CONDITIONS

TA = +25°C

ms1.2

22

17

t

PD-

High-to-Low Propagation Delay
(Note 4)

t

ON

Power-Up Time

∆I

OUT

= 10nA mV/nA±0.2

∆V

REF

/

∆I

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

V

CC

= 5V

BW = 10Hz to 100kHz

TA = T

MIN

to T

MAX

mV/V0.1

∆V

REF

/

∆V

CC

Reference Line Regulation

215

µV

RMS

e

n

Reference Output
Voltage Noise

1.200 1.290

V

1.227 1.245 1.263

V

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= 0, 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= 0, VCM= 0, 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

A

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

MIN

to T

MAX

) are guaranteed

by design, not production tested.

Note 2: V

OS

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

OS

) (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

CC

Sourcing, VO= V

EE

MAX920 only, VO= 5.5V

TA= +25°C

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

10

t

ON

Power-Up Time

98

8

mA

95

I

SC

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

mV

190 400

VCC- V

OH

Output Voltage Swing High,

pA10I

OS

Input Offset Current

mV

190 400

V

OL

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

17

t

PD-

V

CC

= 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

22

VCC= 1.8V
VCC= 5V

MAX919 only

Low-to-High Propagation Delay
(Note 4)

µs

30

t

PD+

VCC= 5V

VCC= 1.8V

95

MAX920 only

VCC= 1.8V
R

PULL-UP

= 100kΩ

35

VCC= 5V
R

PULL-UP

= 100kΩ

120

CL= 15pF µs4t

FALL

Fall Time