RT8057A データシートの表示（PDF） - Richtek Technology
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RT8057A Datasheet PDF : 12 Pages
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RT8057A
Typical Application Circuit
RT8057A
VIN
VIN
LX
CIN
4.7µF
EN
FB
GND
L1
2.2µH
C1 R1
10pF 680k
R2
240k
VOUT
2.3V
COUT
10µF
Function Pin Description
Pin No.
Pin Name
WDFN-6SL 2x2 TSOT-23-5
Pin Function
1
5
LX
Switch Node. Connect to the external inductor.
2
--
NC
No Internal Connection. Connect to GND.
3
4
FB
Feedback Pin. Connect to the external resistor divider. The FB
reference voltage is 0.6V typically.
4
3
EN
Chip Enable (Active High).
5
1
VIN
Power Input. Connect to the input capacitor.
6,
7 (Exposed Pad)
2
GND
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
Slope
Compensation
OSC &
Shutdown
Control
Current
Sense
Current
Limit
Detector
Error
Amplifier
FB
Control
Logic
Driver
PWM
RC
Comparator
COMP
UVLO &
Power Good
Detector
VREF
RS1
LX
RS2
GND
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DS8057A-00 March 2011
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