A8511: 2 MHz, 4 Channel × 150 mA WLED/RGB Driver with Output Disconnect

The A8511 is a multioutput WLED/RGB driver for backlighting medium-size displays. It is a fully integrated high-brightness (HB) LED driver solution that does not require external power devices to complete the backlighting design criteria. The A8511 integrates FETs for a boost converter as well as four 150 mA current sinks, offering a complete integrated solution at HB LED current levels. LED channels can be tied together for up to 600 mA sink capability. It can work from a single power supply of 6.8 to 21 V and withstand up to 40 V. The boost converter is a constant frequency, current-mode converter.

Operating frequency can be set to 2 MHz avoiding interference with the AM radio band. The integrated boost DMOS switch is rated for 40 V at 3.6 A. PWM dimming allows LED currents to be controlled up to a 1000:1 ratio. Additional 4:1 dimming can be achieved by using the DIM pin.

The A8511 provides protection against output connector shorts through an integrated output disconnect switch. An optional external thermistor can be used to limit LED current based on panel temperature.

Applications include:

  • GPS navigation systems
  • Automotive infotainment
  • Back-up camera displays
  • Cluster backlighting
  • Portable DVD players
  • Industrial LCD displays

The device is supplied in a surface mount, 28-pin TSSOP package (suffix LP), with exposed thermal pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • Four LED sinks rated for 150 mA each (600 mA total)
  • Boost converter with integrated 40 V DMOS switch and OVP–load-dump protection
  • 600 kHz to 2.2 MHz switching frequency—ability to operate above the AM band
  • Internal bias supply for single-supply operation (VIN = 6.8 to 21 V)
  • 3.5 µA shutdown current—limits battery drain
  • Active current sharing between LED strings for 0.8% current matching and 0.7% accuracy
  • PWM dimming with LED PWM duty cycle control
  • 4000:1 dimming range
  • Extensive fault mode protection schemes:
    • Shorted LED protection against misconnected loads — with true output disconnect
    • Open LED disconnect protects against LED failures
    • External thermistor sensing to limit LED temperature
    • Output overvoltage protection (OVP): 19.5 V default can be adjusted as high as 38 V
    • Open Schottky and open OVP resistor protection against external component failure
    • Input under- and overvoltage protection (UVLO and OVLO) against VIN variation
    • Boost current limit, output short circuit limit, overtemperature protection (OTP), and soft start

The device is supplied in a surface mount, 28-pin TSSOP package (suffix LP), with exposed thermal pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating.

LP TSSOP 28 pin

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Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8511GLPTR-T 28-lead TSSOP -40°C to 105°C Yes View Data Contact factory Contact your
local sales rep
Check Stock
A8511KLPTR-T 28-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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