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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

  • Smart Phones
  • Probable Instruments
  • Backlight for Small and Media Form
  • Factor LCD Display with Single-cell Battery Input
Key Spec.
RT4531
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 10
Iout (max)/channel (mA) 20
Iq (typ) (mA) 1.2
Dimming Control PWM;Pulse
Topology Boost + Current Source
Features Cycle-by-Cycle Current Limit;Enable Input;OVP;Stable with Ceramic Capacitor;UVP
Package Type WL-CSP1.35x1.35-9(BSC)
Features
  • Input Voltage Range : 2.5V to 5.5V
  • 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% (IFBx = 20mA)
  • LED Current Matching ± 2% ( IFBx = 20mA)
  • Built-in IFB1/IFB2 pin OVP, Short Protection, and Un-Use Detection
Datasheet
TitleVersionLast UpdateDownload
RT4531: Dual Channel 10s2p WLED DriversV3.02016/01/07
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Evaluation Boards
TitleLast UpdateDownload
RT4531 Evaluation Board2021/01/21
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT4531WSCWL-CSP1.35x1.35-9(BSC)3,000 Request Digikey 613 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT4531WSC Digikey 4 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Please confirm with our distributor or sales representative for actual stock status.
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