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RT8057 Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part # RT8057
Description  2.25MHz 1A Synchronous Step-Down Converter
PDF  11 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8057 Datasheet(HTML) 2 Page - Richtek Technology Corporation

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RT8057
2
DS8057-03
November 2011
www.richtek.com
Function Pin Description
Pin No.
Pin Name
Pin Function
1
LX
Switch Node. Connect to the external inductor.
2
NC
No Internal Connection. Connect to GND.
3
FB
Feedback Pin. Connect to the external resistor divider.
4
EN
Chip Enable (Active High).
5
VIN
Power Input. Connect to the input capacitor.
6,
7 (Exposed Pad)
GND
Power GND. The Exposed Pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Function Block Diagram
Typical Application Circuit
COMP
RC
RS1
RS2
EN
VIN
LX
FB
UVLO &
Power Good
Detector
VREF
Slope
Compensation
Current
Sense
OSC &
Shutdown
Control
Current
Limit
Detector
Driver
Control
Logic
PWM
Comparator
Error
Amplifier
GND
VIN
LX
RT8057
EN
FB
VIN
VOUT
L1
3
1
5
4
COUT
R1
R2
C1
GND
6, 7 (Exposed Pad)
2.2µH
10pF
10µF
CIN
4.7µF
680k
240k
2.3V



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