1

LTC1541/LTC1542

Micropower Op Amp,

Comparator and Reference

Daisy-Chained Control Outputs

FEATURES

The LTC

fier, comparator and bandgap reference (LTC1541) in an

8-pin package. The part operates from a single 2.5V to

12.6V or dual

±1.25Vto±6.3Vsupplywithatypicalsupply

current of 5

µA. Both the op amp and comparator feature

a common mode input voltage range that extends from the

negative supply to within 1.3V of the positive supply. The

op amp output stage swings from rail-to-rail. The

comparator’s inverting input is internally connected to the

reference output (LTC1541).

The reference output voltage is 1.2V

±1% over the

extended temperature range. The output can drive a

bypass capacitor of up to 0.01

µF without any oscillations.

It can also source up to 2mA and sink up to 20

µA.

The op amp is internally compensated to be unity-gain

stable with typical GBW at 12kHz and slew rate of 8V/ms.

The comparator has

±3mV of internal hysteresis to ensure

clean output switching, even with slow moving input

signals.

The LTC1541/LTC1542 are available in MSOP and SO-8

packages.

s

Quiescent Current: 5

s

Outputs Swing Rail-to-Rail

s

Low Op Amp Offset Voltage: 700

s

Reference Output Drives 0.01

µF Capacitor

s

Internal 1.2V

±0.4% Reference Output (LTC1541)

s

Low Input Bias Current: 1nA Max

s

Reference Output Can Source Up to 2mA

s

Internal

±3mV Comparator Hysteresis

s

Comparator and Op Amp Input Range

Includes Ground

s

Op Amp Capable of Driving Up to 1000pF Load

s

Unity-Gain Stable and 12kHz Bandwidth

s

2.5V to 12.6V Supply Voltage Range

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Pin Compatible Upgrade for MAX951/MAX953

s

Battery- or Solar-Powered Systems

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Automotive Keyless Entry

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Low Frequency, Local Area Alarms/Detectors

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Infrared Receivers for Remote Controls

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Smoke Detectors and Safety Sensors

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GSM Portable Phones

, LTC and LT are registered trademarks of Linear Technology Corporation.

Total of 839 Units

INPUT OFFSET VOLTAGE (

µV)

–600

600

1541/42 TA02

–300

0

300

50

40

30

20

10

0

–

+

1

2

3

7

8

2N3904

SCR LOAD

5

2M

6

2.2

µF

1N457

LOW BATTERY

OUTPUT HIGH = “ON”

OUTPUT LOW = “OFF”

1.2V INTERNAL

REFERENCE

1541/42 • TA01

–

+

10k

VN2222

2M

1M

100k

10M

1k

–+

1/2 LTC1541

1/2 LTC1541

10k

TYPE R

1N457

Pilot Light Flame Detector with Low-Battery Lockout