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ADD5203:  8-String, White LED Driver with SMBus and PWM Input for LCD Backlight Applications

Product Details

Product Status:Recommended for New Designs

The ADD5203 is a white LED driver for backlight applications based on high efficiency, current-mode, step-up converter technology. It is designed with a 0.15 Ω, 2.9 A internal switch and a pin-adjustable operating frequency between 350 kHz and 1 MHz. The ADD5203 contains eight regulated current sources for uniform brightness intensity. Each current source can be driven up to 30 mA, and the LED driving current is pin adjustable by an external resistor. The ADD5203 drives up to eight parallel strings of multiple series connected LEDs with a ±1.5% current matching between strings.

The ADD5203 provides various dimming modes. Each dimming mode is selectable with an external dimming mode selection pin. The LED dimming control interface can be achieved through PWM input and/or SMBus. The device provides adjustable output dimming frequency range from 200 Hz to 10 kHz by an external resistor and capacitor. The ADD5203 operates over an input voltage range of 6 V to 21 V, but the device can function with a voltage as low as 5.6 V. The ADD5203 also has multiple safety protection features to prevent damage during fault conditions. If any LED is open or short, the device automatically disables the faulty current source. The internal soft start prevents inrush current during startup. Thermal shutdown protection prevents thermal damage.

The ADD5203 is available in a low profile, thermally enhanced, 4 mm × 4 mm × 0.75 mm, 28-lead, RoHS-compliant lead frame chip scale package (LFCSP_WQ) and is specified over the industrial temperature range of −25°C to +85°C.


  • Notebook PCs, UMPCs, and monitor displays


White LED driver based on inductive boost converter

  • Integrated 50 V MOSFET with 2.9 A peak current limit
  • Input voltage range: 6 V to 21 V
  • Maximum output adjustable up to 45 V
  • 350 kHz to 1 MHz adjustable operating frequency
  • Overvoltage protection (OVP) up to typical 47.5 V
  • Built-in soft start for boost converter

Drives up to eight LED current strings

  • LED current adjustable up to 30 mA for each channel
  • Headroom control to maximize efficiency
  • Adjustable dimming frequency: 200 Hz to 10 kHz
  • LED open and short fault protection
  • See data sheet for additional features

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Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADD5201/ADD5203 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
ADD5203CP-EVALZ Status: Production Driver Board and the 8 Channel LED Board $100.00 Yes -
ADD5203EB-EVALZ Status: Production Driver Board $50.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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