RT8057A
Typical Application Circuit
RT8057A
V
IN
C
IN
4.7µF
VIN
EN
FB
GND
R2
240k
LX
C1
10pF
R1
680k
L1
2.2µH
V
OUT
2.3V
C
OUT
10µF
Function Pin Description
Pin No.
WDFN-6SL 2x2
1
2
3
4
5
6,
7 (Exposed Pad)
TSOT-23-5
5
--
4
3
1
2
Pin Name
LX
NC
FB
EN
VIN
GND
Pin Function
Switch Node. Connect to the external inductor.
No Internal Connection. Connect to GND.
Feedback Pin. Connect to the external resistor divider. The FB
reference voltage is 0.6V typically.
Chip Enable (Active High).
Power Input. Connect to the input capacitor.
Power GND. The Exposed Pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Function Block Diagram
EN
VIN
OSC &
Shutdown
Control
Slope
Compensation
Current
Sense
Error
Amplifier
PWM
Comparator
R
S1
Current
Limit
Detector
FB
Control
Logic
Driver
LX
R
C
COMP
R
S2
UVLO &
Power Good
Detector
GND
V
REF
www.richtek.com
2
DS8057A-00 March 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
