RT4533 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Asynchronous Boost Converter

®
RT4533/A
Asynchronous Boost Converter for 10 WLEDs
General Description
The RT4533/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 36.5V/1.2A power
switch.
The RT4533/A supports a wide input voltage range from
2.5V to 5.5V and runs at a fixed frequency of 1.1MHz.
The LED current is set via an external resistor and the
feedback voltage is regulated to 200mV / 300mV.
For brightness dimming, the RT4533/A supports PWM
dimming which determines the feedback reference voltage.
Applications
 Cellular Phones
 Digital Cameras
 Probable Instruments
Marking Information
RT4533GJ6
0R=DNN
0R= : Product Code
DNN : Date Code
RT4533AGJ6
1L=DNN
1L= : Product Code
DNN : Date Code
Features
 2.5V to 5.5V Input Voltage Range
 36.5V Open LED Protection for 10 WLEDs
 PWM Dimming Brightness Control
 200mV / 300mV Reference Voltage with ±2%
Accuracy
 1.1MHz Switching Frequency
 Built-In Soft-Start
 Over-Temperature Protection
 Internal Compensation
 Current Limit
 RoHS Compliant and Halogen Free
Ordering Information
RT4533/A
Package Type
J6 : TSOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Feedback Voltage
RT4533 : 200mV
RT4533A : 300mV
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
V_IN
Enable
L
D
LX
VIN VOUT
RT4533/A
EN
GND
FB
V_OUT
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS4533/A-02 September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1