®
RT4531
Dual Channel 10s2p WLED Drivers
General Description
Features
Input Voltage Range : 2.5V to 5.5V
The RT4531 is a dual-channel current source with high-
efficiency asynchronous boost converter for backlight
application. The RT4531 has built-in 1.5A/36V power
MOSFET and two high current-matching capability current
sink, so RT4531 can drives up 10s2p white LED. The
RT4531 can allow very low voltage headroom control,
therefore to improve LEDstrings efficiency effectively.
Internal Soft-Start, UVLO, OTP, OCP, OVP
Typical Shutdown Current : < 1μA
1MHz Switching Frequency
Drives Up to 10 WLEDs in Two Strings
Independent PWM Dimming and 1-Wire Dimming
Control
PWM Dimming Frequency from 20k to 100kHz
Up to 10 Bit Dimming Resolution
LED Current Accuracy 2% ( > 5mA)
LED Current Matching 2% ( > 5mA)
Built-in IFB1/IFB2 pin OVP, Short Protection, and
Un-Use Detection
The RT4531 supports both PWM dimming and 1-wire
digital dimming interface and it can realize 10 bit
brightness code programming.
The RT4531 provides complete protection functions such
as input Under-Voltage Lockout (UVLO), Over-Current
Protection (OCP), Output Over Voltage (OVP) and Over-
Temperature Protection (OTP).
Ordering Information
RT4531
The RT4531 is available in the WL-CSP-9B 1.35x1.35
(BSC) package.
Package Type
WSC : WL-CSP-9B 1.35x1.35 (BSC)
Applications
Note :
Smart Phones
Richtek products are :
Probable Instruments
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.
Backlight for Small and Media Form
Factor LCDDisplay with Single-cell Battery Input
Simplified Application Circuit
L
V
IN
C1
C3
R1
SW
VIN
C2
RT4531
2P10S
WLEDs
EN
Enable
PWM Dimming
IFB1
IFB2
ISET
PWM
GND AGND
R2
Copyright 2016 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS4531-01 July 2016
www.richtek.com
1