RT8055QWZ 查看數據表（PDF） - Richtek Technology
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RT8055QWZ Datasheet PDF : 14 Pages
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RT8055
Functional Pin Description
Pin No.
WDFN-10L 3x3
SOP-8
Pin Name
Pin Function
Shutdown Control or Frequency Setting Input. Connect a
1
1
SHDN/RT resistor to ground from this pin sets the switching frequency.
Force this pin to VDD or GND causes the device to be shut down.
Signal Ground. All small-signal components and compensation
2,
2,
GND
11 (Exposed Pad) 9 (Exposed Pad)
components should be connected to this ground, which in turn
connects to PGND at one point. The exposed pad must be
soldered to a large PCB and connected to GND for maximum
power dissipation.
Internal Power MOSFET Switches Output. Connect this pin to
3, 4
3
LX
the inductor.
Power Ground. Connect this pin close to the negative terminal of
5
4
PGND
CIN and COUT.
6, 7
5
PVDD
Power Supply Input. Decouple this pin to PGND with a capacitor.
Signal Supply Input. Decouple this pin to GND with a capacitor.
8
6
VDD
Generally, VDD is equal to PVDD.
Feedback Pin. This pin receives the feedback voltage from a
9
7
FB
resistive divider connected across the output.
Error Amplifier Compensation Point. The current comparator
10
8
COMP threshold increases with this control voltage. Connect external
compensation elements to this pin to stabilize the control loop.
Function Block Diagram
SHDN/RT
COMP
FB
SD
OSC
0.8V
EA
Output
Clamp
Internal -
Soft Star
POR
0.7V
0.4V
Slope
Comp.
ISEN
OC
Limit
Control
Logic
OTP
VREF
Driver
NISEN
N-MOSFET ILIM
PVDD
LX
PGND
GND
VDD
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8055-05 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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