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RT8509GQW Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part # RT8509GQW
Description  3A, 14V Step-Up DC/DC Converter
Download  9 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8509GQW Datasheet(HTML) 2 Page - Richtek Technology Corporation

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RT8509
2
DS8509-01 March 2012
www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
COMP
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground.
2
FB
Feedback. The FB regulation voltage is 1.25V nominal. Connect an external
resistive voltage divider between the step-up regulator’s output (VOUT) and GND,
with the center tap connected to FB. Place the divider close to the IC and minimize
the trace area to reduce noise coupling.
3
EN
Chip Enable. Drive EN low to turn off the Boost.
4, 5,
11 (Exposed Pad)
GND
Ground. The Exposed Pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
6, 7
LX
Switch. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode
junction to LX and minimize the trace area for lower EMI.
8
VSUP
Boost Converter Over Voltage Protection Input. Bypass VSUP with a minimum 1
μF
ceramic capacitor directly to GND.
9
VIN
Supply Input . Bypass VIN with a minimum 1μF ceramic capacitor directly to GND.
10
SS
Soft-Start Control. Connect a soft-start capacitor (CSS) to this pin. The soft-start
capacitor is charged with a constant current of 5
μA. The soft-start capacitor is
discharged to ground when EN is low.
Function Block Diagram
Soft
Start
Control
and
Driver
Logic
Current
Sense
Protection
+
-
+
-
Slope
Compensation
Oscillator
OVP
LX
OTP
Error Amplifier
VDD
1.25V
FB
COMP
EN
VIN
VSUP
Summing
Comparator
LX
SS
GND
Clock


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