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Related Links:

Datasheets:
A8480: Boost Regulator for Display Bias or LED Driver (PDF)

Selection Guides:
Power Management ICs: Display Power and Backlight

when this product is updated

Design Support Tools:
APEK8480EEJ-01 Evaluation Board

A8480
Boost Regulator for Display Bias or LED Driver

These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: November 1, 2008

Features

• Output disconnect during shutdown
  • 1 µA shutdown current
• 2.7 to 9 V input
  • Operate with 1 or 2 Li+ battery input supply
• 1.2 MHz switching frequency
• 1.5 A switch current limit
• Internal overvoltage and overtemperature protection, and soft start

Applications

• WLED flash/torch
• WLED backlight
• OLED bias supplies
• LCD bias supplies
• General purpose boost converter

Description

The A8480 is a 1.2 MHz optimized boost converter with internal soft-start and compensation to support WLED, flash/torch, and display bias applications. The input voltage range of 2.7 to 9 V supports either 1 or 2 Li-ion battery applications. The high voltage integrated double-diffused MOSFET (DMOS) allows output voltages as high as 23 V with a switch current limit of 1.5 A, this increases the maximum quantity of LEDs that can be used in series.

To maximize battery life in the application, the output can be completely disconnected from the battery voltage to virtually eliminate leakage current in the system. For system protection, the A8480 has internal overtemperature and overvoltage protection.

The A8480 is available in both 1.6 mm × 1.6 mm, 0.5 mm nominal height CSP, and 3 mm × 3 mm, 0.75 mm nominal height MLP/DFN packages.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8480ECGLT-T	9-lead CSP	--	--	-40 °C to  85 °C	not for new design	samples not available
A8480EEJTR-T	10-lead MLP	Yes	view data	-40 °C to  85 °C	not for new design	samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.