RT8032
Typical Application Circuit
RT8032
V
IN
R
SS
1Meg
C
SS
57nF
10 ISET
C
C1
680nF
R
C1
1k
R
LIM
24k
PGND
C
C2
1.1nF
5, Exposed Pad (13)
C
IN
10µF
1 SHDN/SS
9 VIN
SW
4
L
4.7µH
R1
112k
R
C
C
C
120k 60nF
R2
32k
VOUT 6, 8
FB 12
COMP
11
V
OUT
3.6V
C
OUT
2200nF
GND
3
Functional Pin Description
Pin No.
Pin Name
Pin Function
Shutdown and Soft-Start Control Input. Connect this pin to a supply voltage that is
>1.4V to enable the IC and to a supply voltage that is <0.4V to shutdown the IC. An
SHDN/SS
RC network from the shutdown command signal to the pin will provide a soft-start
function by the rising time of the FB pin
NC
GND
SW
No Internal Connection.
Ground. Return the feedback resistive dividers to this ground, which in turn
connects to PGND at one point.
Internal Power MOSFET Switches Output. Connect this pin to the output inductor.
Power Ground. The exposed pad must be soldered to a large PCB and connected
to PGND for maximum power dissipation.
Output of the Converter. A filter capacitor is placed from V
OUT
to GND.
Power Input. Internal VCC for the IC. A 10μF ceramic capacitor is recommended
as close as to VIN and GND as possible
Average Input Current Limit Setting. Place a resistor and capacitor in parallel from
the pin to GND
Error Amplifier Output. The current comparator threshold increases with the control
voltage. Connect external compensation elements to the Pin to stabilize the control
loop.
Feedback Input. Receives the feedback voltage from a resistive divider connected
across the output.
1
2, 7
3
4
5,
PGND
13 (Exposed Pad)
6, 8
9
10
11
12
VOUT
VIN
ISET
COMP
FB
www.richtek.com
2
DS8032-02 March 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
