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| RT4531 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Dual Channel 10s2p WLED Drivers | |||
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®
RT4531
Dual Channel 10s2p WLED Drivers
General Description
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 LED strings efficiency effectively.
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).
The RT4531 is available in the WL-CSP-9B 1.35x1.35
(BSC) package.
Applications
ï¬ Smart Phones
ï¬ Probable Instruments
ï¬ Backlight for Small and Media Form
ï¬ Factor LCD Display with Single-cell Battery Input
Features
ï¬ Input Voltage Range : 2.5V to 5.5V
ï¬ Internal Soft-Start, UVLO, OTP, OCP, OVP
ï¬ Typical Shutdown Current : < 1μA
ï¬ 1MHz Switching Frequency
ï¬ Drives Up to 10 WLEDs in Two Strings
ï¬ Independent PWM Dimming and 1-Wire Dimming
Control
ï¬ PWM Dimming Frequency from 20k to 100kHz
ï¬ Up to 10 Bit Dimming Resolution
ï¬ LED Current Accuracy ± 2% ( > 5mA)
ï¬ LED Current Matching ± 2% ( > 5mA)
ï¬ Built-in IFB1/IFB2 pin OVP, Short Protection, and
Un-Use Detection
Ordering Information
RT4531
Package Type
WSC : WL-CSP-9B 1.35x1.35 (BSC)
Note :
Richtek products are :
ï½ RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
ï½ Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
VIN
C1
R1
C2
Enable
PWM Dimming
L
VIN
SW
RT4531
EN
PWM
IFB1
IFB2
ISET
GND AGND
C3
2P10S
WLEDs
R2
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS4531-01 July 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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