RT9277B 데이터 시트보기 (PDF) - Richtek Technology
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RT9277B Datasheet PDF : 12 Pages
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RT9277A/B
Preliminary
Functional Pin Description
Pin No.
RT9277A RT9277B
Pin Name
Pin Function
Compensation Pin for Error Amplifier. Connect a compensation network
1
1
COMP
to ground. See the Component Selection Table for the loop
compensation.
2
2
FB
Feedback Pin. Connect an external resistor-divider tap to FB. The typical
reference voltage is 1.24V.
3
3
EN
Shutdown Control Input. Connect EN to GND to turn off the RT9277A/B.
4
4
GND
Ground
5
5
LX
Switch Pin. Connect the inductor and catch diode to LX pin. Widen and
shorten the connected trace to minimize EMI.
6
6
VIN
Supply Pin. Place at least a 1μF ceramic capacitor close to RT9277A/B
for bypassing noise.
Frequency Select Pin. Oscillator frequency is 640kHz as FREQ
7
7
FREQ
connected to GND, and 1.2MHz as FREQ connected to VIN. A 5μA
pull-down current is sinking on this pin.
Soft-Start Control Pin. Connect a soft-start capacitor (CSS) to this pin. A
4μA constant current charges the soft-start capacitor. When EN
--
8
SS
connected to GND, the soft-start capacitor is discharged. When EN
connected to VIN high, the soft-start capacitor is charged to VIN. Leave
floating for not using soft-start.
8
--
NC
No Connection
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DS9277A/B-02 March 2007
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