RT8113

3

DS8113-02 April 2011

www.richtek.com

Pin No.

Pin Name

Pin Function

2

OCSET

Over Current Protection Threshold Set Pin.

3

FBRTN

Return Ground. This pin is Negative Node of the differential Remote Voltage

sending.

4

SS

Soft-Start Ramp Slope Set Pin. Connect this pin to FBRTN by a Capacitor to

Adjust soft-start slew rate.

5

COMP

Compensation Pin. Output of Error Amplifier and Input of PWM comparator.

6

FB

Inverting Input of Error Amplifier.

7

ADJ

Droop Set Pin. Connect a resistor from this pin to GND sets the load line slope.

8

OFS

Voltage Offset Pin. This pin sets No-Load Output Voltage Offset. Connect a

resistor from this Pin to VCC5 or GND to bidirection set the output voltage

no-load offset.

9

RT/EN

Switching Frequency Set Pin. Connect this pin to GND via a resistor to adjust

switching frequency and operate with droop function.

Connect this pin to VCC5 via a resistor to adjust switching frequency and operate

without droop function.

10

VCC5

Internal 5V Regulator Output.

11

ISP

Non-Invertering Input of Current Sense Amplifier.

12

ISN

Invertering Input of Current Sense Amplifier.

13

LGATE

Lower Gate Driver. This pin drives the gate of low side MOSFETs.

14

VCC12

12V Power Supply Input Pin.

15

PHASE

Switch Node of High side Driver. Connect this pin to high-side MOSFETs sources

together with the low side MOSFETs drains and inductor.

16

UGATE

Upper Gate Driver. This pin drives the gate of the high-side MOSFETs.

17

BOOT

Bootstrap Power Pin. This pin powers the high-side MOSFETs drivers. Connect

this pin to the junction of the bootstrap capacitor with the cathode of the bootstrap

diode.

18

PGOOD

Power Good Indicator.

19 to 24,1

VID7 to VID1 DAC Voltage Identification Inputs.

25

(Exposed Pad)

GND

Ground Pin. The exposed pad must be soldered to a large PCB and connected to

AGND for maximum power dissipation.

Functional Pin Description