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RT9224C
Preliminary
4
DS9224C-02 March 2004
www.richtek.com
Functional Pin Description
Pin No. Pin Name
Pin Function
1
VSEN
Output voltage monitoring input for OVP & PGOOD
2
OCSET
Over current set pin, sinks 200µA through a resistor (ROCS) from this pin to upper
N-MOSFET to set the trip point:
× OCS
PEAK
200uA R
I=
MOSFET - on resistance
An over-current trip cycles the soft-start function
3
SS
Soft start speed is set by internal 10µA current source and capacitor from this pin to GND
4
VID0
Switching regulator output voltage setting
5
VID1
Switching regulator output voltage setting
6
VID2
Switching regulator output voltage setting
7
VID3
Switching regulator output voltage setting
8
VID4
Switching regulator output voltage setting
9,20
NC
No connection
10
FB
Feedback input pin
11
GND
IC signal ground
12
PGOOD
Open drain logic output
This pin is pulled low when the converter output is not within ±10% of the DACOUT
reference voltage
13
PHASE
Current limit sense input
14
UGATE
High side driver output
15
BOOT
Driver power
16
PGND
Low side driver GND
17
LGATE
Low side driver output
18
VCC
Power supply input
19
OVP
Over voltage protection
This pin is pulled high when the VSEN voltage is over 15% of the DACOUT reference
voltage
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