Diodes AP3039 - Manual (Page 3)

BOOST CONTROLLER AP3039
Data Sheet
3
BCD Semiconductor Manufacturing Limited Jun. 2010 Rev. 1. 6
Pin Number
Pin Name Function
16-pin 14-pin
1 3 EN Enable pin
2 4 VIN Input supply pin, must be locally bypassed
3, 12 NC No connection (for QFN-3x3-16 package only)
4 5 VCC
6V linear regulator output pin. VCC is used to bias the gate driver for the external
MOSFET. If V
IN
is less than 8.5V, the V
CC
is equal to V
IN
minus drop voltage across
bypass switch. If V
IN
is less than 6V, connect VCC to VIN. This pin should be bypassed to
GND (recommend to connect with AGND pin) with a ceramic capacitor
5 6 OUT
Connect this pin to the gate of external MOSFET, the gate driver has 0.6A peak current
capability
6 7 PGND Power ground
7 8 RT An external resistor connected from this pin to GND to set the operating frequency
8 9 CS Sense switch current pin, which is used for current mode control and for current limit
9 10 AGND Reference ground
10 11 SHDN
This pin can be connected to current matched chip and receives error signal used to shut
down the system
11 12 FB Voltage Feedback Pin. The reference voltage is 500mV
13 13 COMP Compensation Pin. This pin is the output of the internal Error Amplifier
14 14 SS
An external soft start time capacitor is connected from this pin to ground and is charged by
internal 12
µA current source to control regulator soft start time
15 1 UVLO
Two resistors connected from this pin to ground and the VIN pin respectively to set start up
and shutdown level
16 2 OV Over output voltage protection pin
EP
Exposed backside pad. Solder to the circuit board ground plane with sufficient copper
connection to ensure low thermal resistance (for
QFN-3x3-16 package only)
Pin Description