rt9275 Richtek Technology Corporation, rt9275 Datasheet - Page 2

• Manufacturer Part Number: rt9275
• Description: Tiny Package, High Efficiency, Step-up Dc/dc Converter
• Manufacturer: Richtek Technology Corporation

RT9275
Typical Application Circuit
Functional Pin Description
Function Block Diagram
www.richtek.com
2
Pin No.
1
2
3
4
5
6
EN
EXT
GND
LX
VDD
FB
Pin Name
V
IN
VDD
EN
FB
Chip Enable (Active High)
Output pin for driving external NMOS
Ground
Pin for switching
Input positive power pin of RT9275
Feedback input pin. Internal reference
voltage for the error amplifier is 1.25V.
Pin Function
EN
EXT
Under Voltage
C3
10uF
Protection
RT9275
GND
VDD
Bandgap/
Soft Start
4.7 uH
L1
FB
LX
VDD
V
Preliminary
REF
Over Voltage
Protection
-
+
C2
1uF
Loop Control
Over Temp.
Detector
Circuit
FS1J2E
6.8pF/
3.3pF
C4
D1
R1
R2
980k/1M
2M/3M
Suspend
Function
C1
10uF/20uF
3.3V/5V
V
EXT
LX
GND
OUT
DS9275-06 March 2007