Richtek RT8509A, Manual

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RT8509A
®
DS8509A-00 November 2013 www.richtek.com
1
© Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
4.5A Step-Up DC/DC Converter
General Description
The RT8509A is a high performance switching Boost
converter that provides a regulated supply voltage for active
matrix thin film transistor (TFT) liquid crystal displays
(LCDs).
The RT8509A incorporates current mode, fixed-frequency,
pulse width modulation (PWM) circuitry with a built in
N-MOSFET to achieve high efficiency and fast transient
response.
The RT8509A has a wide input voltage range from 2.8V to
14V. In addition, the output voltage can be adjusted up to
24V via an external resistive voltage divider. The maximum
peak current is limited to 4.5A (min.). Other features
include adjustable soft-start, over-voltage protection, and
over-temperature protection.
The RT8509A is available in the WDFN-12L 5x5 package.
Features
    
90% Efficiency
    
Adjustable Output Up to 24V
    
2.8V to 14V Input Supply Voltage
    
Input Supply Under-Voltage Lockout
    
Fixed 1.2MHz Switching Frequency
 
 

Adjustable Soft-Start
    
V
OUT
Over-Voltage Protection
    
Over-Temperature Protection
    
Thin 12-Lead WDFN Package
    
RoHS Compliant and Halogen Free
Applications

GIP TFT-LCD Panels
Ordering Information
Note :
Richtek products are :

RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.
Package Type
QW : WDFN-12L 5x5 (W-Type)
RT8509A
Lead Plating System
G : Green (Halogen Free and Pb Free)
LX
RT8509A
VIN
EN
VOUT
FB
SS
COMP GND
R1
R2
C
OUT
V
OUT
C
SS
R3
C1
C2
R4
C
IN
V
IN
L1
D1
C3
Enable
Marking Information
RT8509A
GQW
YMDNN
RT8509AGQW : Product Number
YMDNN : Date Code
Simplified Application Circuit