LTC2925C(RevD) Просмотр технического описания (PDF) - Linear Technology

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LTC2925C
(Rev.:RevD)

Multiple Power Supply Tracking Controller with Power Good Timeout

Linear Technology 

LTC2925

Pin Functions GN/UF Packages

PGTMR (Pin 23/Pin 20): Power Good Timer. A capacitor

from PGTMR to GND sets the power good timer duration.

While ON > 1.23V, the PGTMR pin will pull up to VCC with

10µA. Otherwise, it pulls to GND. If the voltage on the

PGTMR pin exceeds 1.23V and PGI is still low, FAULT will

be pulled low and the GATE will be pulled to ground with

20mA until the power good timer fault is cleared by pulling

ON below 0.4V. If FAULT is tied back to ON the system

will automatically retry after a FAULT. In this mode, verify

that the slave supplies’ current limits provide sufficient

protection under short-circuit conditions. Tie PGTMR to

GND when it is unused.

SCTMR (Pin 24/Pin 21): Circuit Breaker Timer. A capacitor

from SCTMR to GND programs the maximum time that a

short circuit can be sustained before GATE is pulled low.

When (SENSEP – SENSEN) > 50mV, SCTMR will pull up

with 50µA, otherwise it pulls down with 2µA. When the

voltage at SCTMR exceeds 1.23V, the GATE will be pulled

to ground with 20mA and the FAULT pin will be pulled low.

The circuit breaker function is reset by pulling ON below

0.4V. The GATE pin will not rise again until SCTMR has

been pulled below 100mV by the 2µA current source. If

FAULT is tied back to ON the system will automatically

retry after a fault. Tie SCTMR to GND if the circuit breaker

is not used.

For more information www.linear.com/LTC2925

2925fd

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