LT1970A

1

1970afa

2V/DIV

0V

1970A TA01b

100μs/DIV

CURRENT LIMIT = 500mA

TYPICAL APPLICATION

DESCRIPTION

500mA Power Op Amp with

Adjustable Precision Current Limit

externally controlled current limiting. Separate control

voltages program the sourcing and sinking current limit

sense thresholds with 1% accuracy. Output current may

be boosted by adding external power transistors.

The circuit operates with single or split power supplies

from 5V to 36V total supply voltage. In normal opera-

tion, the input stage supplies and the output stage sup-

power dissipation it is possible to power the output stage

is unity-gain stable with a 3.6MHz gain-bandwidth product

and slews at 1.6V/μs. The LT1970A can drive capacitive

and inductive loads directly.

Open-collector status flags signal current limit circuit

activation, as well as thermal shutdown of the amplifier.

An enable logic input puts the amplifier into a low power,

high impedance output state when pulled low. Thermal

shutdown and a ±800mA fixed current limit protect the

chip under fault conditions.

The LT1970A is packaged in a 20-lead TSSOP package with

a thermally conductive copper bottom plate to facilitate

heat sinking.

Device Power Supply (DPS) with ±500mA Adjustable Current Limit

FEATURES

APPLICATIONS

Sink Current Limits

Sink Current Limit

Source Current Limit

Thermal Shutdown

COMMON

EN

10k

100pF

ISNK

ISRC

SENSE

TSD

OUT

1Ω

1/4W

TRACE R

100mΩ

TRACE L

200nH

6k

+IN

20V

LT1970A

–5V

20V

–IN

LOAD

ESR

0.1Ω

4.7μF

1970A TA01

0V TO 5V

CS

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