rt9903b Richtek Technology Corporation, rt9903b Datasheet - Page 4

• Manufacturer Part Number: rt9903b
• Description: Channel Dc/dc Converters With High-efficiency Step-up
• Manufacturer: Richtek Technology Corporation

RT9903B
Functional Pin Description
www.richtek.com
4
Exposed Pad (25) GND
Pin No.
10
12
13
14
15
16
17
18
19
20
21
22
23
24
11
1
2
3
4
5
6
7
8
9
NC
PGND
PGND
RT
EXT4
CS4
FB4
COMP4
FB3
COMP3
LX3
EN3
EN1
EN2
EN4
PGND
VDD
LX1
COMP1
FB1
AGND
FB2
COMP2
LX2
Pin Name
No Connection.
Power Ground.
Power Ground.
Frequency Setting Resistor Connection Pin.
CH4 External Power Switch.
CH4 Current Sense Input Pin.
CH4 Feedback Input.
CH4 Feedback Compensation Pin.
CH3 Feedback Input.
CH3 Feedback Compensation Pin.
CH3 Switch Node.
CH3 Enable Input Pin.
CH1 Enable Input Pin.
CH2 Enable Input Pin
CH4 Enable Input Pin.
Power Ground.
Power Input Pin.
CH1 Switch Node.
CH1 Feedback Compensation Pin.
CH1 Feedback Input.
Analog Ground.
CH2 Feedback Input.
CH2 Feedback Compensation Pin.
CH2 Switch Node.
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Preliminary
Pin Function
DS9903B-07 August 2007