RT8078AZSP Просмотр технического описания (PDF) - Richtek Technology
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RT8078AZSP Datasheet PDF : 12 Pages
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RT8078A
Functional Pin Description
Pin No.
Pin
WDFN-10L 3x3
SOP-8
(Exposed Pad)
Name
Pin Function
1, 2, 3
1, 2
LX
Switch Node. Connect this pin to the inductor.
Power Good Indicator. This pin is an open drain logic output that is
4
3
PGOOD pulled to ground when the output voltage is less than 90% of the
target output voltage. Hysteresis = 5%.
5
4
EN
Enable Control. Pull high to turn on. Do not float.
6
5
FB
Feedback Pin. This pin receives the feedback voltage from a
resistive voltage divider connected across the output.
7
--
NC
No Internal Connection.
8
6
SVIN
9,10
7,8
PVIN
11
(Exposed Pad)
9
(Exposed Pad)
GND
Signal Input Pin. Decouple this pin to GND with at least 1μF ceramic
cap.
Power Input Pin. Decouple this pin to GND with at least 4.7μF
ceramic cap.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Function Block Diagram
EN
PGOOD
PGOOD
EN
OSC
Slope
Com
ISEN
0.6V
EA
FB
Output
Clamp
Int-SS
POR
0.72V
OV
0.54V
PG
0.2V
UV
SVIN
OC
Limit
Control
Logic
VREF OTP
Driver
NISEN
Zero Current
PVIN
LX
DS8078A-01 June 2011
www.richtek.com
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