RT2910A

Copyright © 2017 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS2910A-00

August

2017

www.richtek.com

5

to 50mV. A current is generated to start charging up the

TMR pin when over current condition is detected. The

MOSFET is turned off when it reaches 1.45V.

PWM Inverting Converter

PWM inverting converter can act a current mode non-

synchronous

Buck-Boost

converter

to

generated

negative output voltage, embedded an internal P-

MOSFET. The UVLO (under-voltage lockout) function

ensures

PWM

converter

operates

correctly

with

5V) voltage for circuit powered directly by VIN. Connect

a resistor from the RT pin to GND to set PWM switching

frequency between 300kHz to 800kHz. Current limit

comparator compares the CS pin voltage with 100mV

reference voltage. Connect resistor between inductor

and PGND to set peak inductor current limit threshold.

5VDET pin is VIN detection. After soft-start beginning, if

5VDET pin above 1V and SFB pin less 0.6V POK will

pull high.

If HV-Switch Over-current/Over-voltage is triggered, the

will pull low immediately to turn off GATE.

At the same time, a 10

A current source is charging the

FDLY capacitor. When the FDLY pin is a above 1.25V,

POK will pull high to turn on GATE again.

The PWM converter also provides Over Temperature

Protection (OTP).