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A8480: Boost Regulator for Display Bias or LED Driver (PDF)
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A8480
Boost Regulator for Display Bias or LED Driver
These parts are no longer in production The device should not be purchased for new design applications. Samples are no longer available.
Date of status change: November 2, 2009.
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
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A8480ECGLT-T | 9-lead CSP | Yes | view data | -40 °C to 85 °C | discontinued |
Contact Local Sales Representative or check distributor stock |
|
| A8480EEJTR-T | 10-lead MLP | Yes | view data | -40 °C to 85 °C | discontinued |
Contact Local Sales Representative or check distributor stock |
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.