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THV3012_Rev.1.00_E

THine Electronics, Inc.

Copyright©2009 THine Electronics, Inc.

Pin Description

Pin

Symbol

Function

1

VIN

Input voltage detection pin. Connect to the input power supply.

2

PSI

Power standby Indication. Applying low level voltage to this pin, IC

goes into the light load mode. Applying high level, IC operates in the

synchronous mode.

3

BOOT

Bootstrap pin. Bias input for high side power MOSFET driver.

4

LL

Switching output. Connect to the inductor node.

5FSET

Oscillation frequency setting pin. Connect to VCC for 360kHz, leave it

open for 500kHz.

6

HG

High side gate drive output.

7

OFFDELAY

Shut-off delay time setting. Connect a capacitor to the GND.

8

LG

Low gate drive output.

9

GND

Ground.

10

PGOOD

Power good output. PGOOD outputs High level, when CTL pin is High

level and output voltage is 82.4% or more of set voltage.

11

CSN

Current sense negative input.

12

CSP

Current sense positive input. When 60mV(typ) or more of voltage dif-

ference is detected between CSP pin and CSN pin, the voltage on LL

pin falls down to the low level. When the voltage on CTL pin is low

level, the transistor turns to the On state and pull-down the output volt-

age.

13

FB

Output voltage feedback.

14

SS

Soft start time setting pin. Connect a capacitor to the GND.

15

CTL

Enable pin. Active at high level. CTL pin is able to be set at the voltage

higher than VIN.

16

VCC

Power supply for control block. Connect to power supply of 4.5 ~ 5.5V.

Connect a capacitor to the GND.