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  Richtek Technology Electronic Components Datasheet  

RT4503A Datasheet

Asynchronous Boost Converter

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®
RT4503/A
Asynchronous Boost Converter for 10 WLEDs
General Description
The RT4503/A is a highly integrated LED driver IC capable
of driving 10 WLEDs in series. It is composed of a current
mode Boost converter integrated with a 36V/1.2A power
switch.
The RT4503/A supports a wide input voltage range from
2.5V to 5.5V and runs at a fixed frequency of 550kHz.
The LED current is set via an external resistor and the
feedback voltage is regulated to 200mV.
For brightness dimming, the RT4503A supports 32 steps
pulse dimming which determines the feedback reference
voltage, and RT4503 support PWM dimming which
determines the feedback reference voltage.
Applications
Cellular Phones
Digital Cameras
Probable Instruments
Features
2.5V to 5.5V Input Voltage Range
36V Open LED Protection for 10 WLEDs
Pulse Dimming Brightness Control
200mV Reference Voltage with ±2% Accuracy
550kHz Switching Frequency
Built-In Soft-Start
Over-Temperature Protection
Internal Compensation
Current Limit
Ordering Information
RT4503/A
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
RT4503 : PWM Dimming
RT4503A : Pulse Dimming
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.
Simplified Application Circuit
VIN
L
LX
VIN
RT4503/A
EN
GND
COMP*
FB
* : COMP pin for RT4503 only.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS4503/A-03 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT4503A Datasheet

Asynchronous Boost Converter

No Preview Available !

RT4503/A
Marking Information
RT4503GQW
1T : Product Code
1TW
W : Date Code
RT4503AGQW
2RW
2R : Product Code
W : Date Code
Pin Configurations
(TOP VIEW)
FB 1
COMP 2
GND 3
6 VIN
5 EN
7 4 LX
WDFN-6L 2x2
RT4503
FB 1
NC 2
GND 3
6 VIN
5 EN
7 4 LX
WDFN-6L 2x2
RT4503A
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 FB
Feedback Voltage Input. Place a resistor between this pin and GND to set
the current.
COMP (RT4503) Connect an External Capacitor to this Pin.
2
NC (RT4503A) No Internal Connection.
3,
7 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected
to GND for maximum thermal dissipation.
4 LX
Switch Node. Connect the pin to the switch side of the inductor.
5 EN
Enable Control Input and Pulse Dimming Input.
6 VIN
Supply Voltage Input.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS4503/A-03 June 2015


Part Number RT4503A
Description Asynchronous Boost Converter
Maker Richtek Technology
Total Page 13 Pages
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