RT9728C

3

DS9728C-00 October 2015

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Copyright 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Function Block Diagram

≒

60



UVLO

Current

Limit

7.5ms

Deglitch

4ms

Deglitch

Thermal

Sense

Drive

Reverse Voltage

Comparator

Switch

well

Current

Sense

+

-

VOUT

ILIM

GND

EN

VIN

FAULT

Operation

The RT9728C are current-limited, power-distribution

switches using P-channel MOSFETs for applications

where short circuits or heavy capacitive loads will be

encountered. These devices allow the user to program

the current-limit threshold between 75mA and 1.3A (typ)

via an external resistor.Additional device shutdown features

include over temperature protection and reverse-voltage

protection.

The driver controls the gate voltage of the power switch.

The driver incorporates circuitry that controls the rise and

fall times of the output voltage to limit large current and

voltage surges and provides built-in soft-start functionality.

The RT9728C enters the constant-current mode when the

load exceeds the current-limit threshold.