RT8070ZQW 查看數據表（PDF） - Richtek Technology
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RT8070ZQW Datasheet PDF : 12 Pages
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RT8070
Functional Pin Description
Pin No.
SOP-8
(Exposed Pad)
WDFN-8L 3x3
1
1
Pin Name
Pin Function
COMP
Error Amplifier Compensation Point. The current comparator
threshold increases with this control voltage. Connect external
compensation elements to this pin to stabilize the control loop.
Soft-Start Control Input. Connect a capacitor from SS to GND to
2
2
SS
set the soft-start period. A 10nF capacitor sets the soft-start
period to 800μs (typ.).
3
3
EN
4
4
VIN
5
5
LX
6
6
RT
7
7
FB
8
8
PGOOD
9
(Exposed Pad)
9
(Exposed Pad)
GND
Enable Control Input. Float or connect this pin to logic high for
enable. Connect to GND for disable.
Power Input Supply. Decouple this pin to GND with a capacitor.
Internal Power MOSFET Switches Output. Connect this pin to
the inductor.
Oscillator Resistor Input. Connect a resistor from this pin to
GND sets the switching frequency. If this pin is floating, the
frequency will be set at 2MHz internally.
Feedback. Receives the feedback voltage from a resistive
divider connected across the output.
Power Good Indicator. This pin is an open drain logic output
that is pulled to ground when the output voltage is not within
±12.5% of regulation point.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Function Block Diagram
RT
COMP
FB
SS
EN
SD
OSC
0.8V
EA
Output
Clamp
10µA
Hiccup
Enable
0.7V
P-G
0.4V
UV
Slope
Com
ISEN
OC
Limit
Control
Logic
OTP
Driver
NISEN
N-MOSFET ILIM
VIN
LX
GND
PGOOD
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8070-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
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