LM3559TLX National Semiconductor Corporation, LM3559TLX Datasheet

LM3559TLX

Manufacturer Part Number

LM3559TLX

Description

Synchronous Boost Flash Driver With Dual 900 Ma High Side Current Sources 1.8a Total Flash Current

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM3559TLX.pdf (40 pages)

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Synchronous Boost Flash Driver with Dual 900 mA High

Side Current Sources (1.8A Total Flash Current)

General Description

The LM3559 is a 2MHz fixed-frequency synchronous boost

converter with two 900 mA constant current drivers for high-

current white LEDs. The dual high-side current sources allow

for grounded cathode LED operation and can be tied together

for providing flash currents of up to 1.8A. An adaptive regu-

lation method ensures the current for each LED remains in

regulation and maximizes efficiency.

The LM3559 is controlled via an I

Features include: an internal 4-bit ADC to monitor the LED

voltage, independent LED current control, a hardware flash

enable allowing a logic input to trigger the flash pulse, dual

TX inputs which force the flash pulse into a low-current torch

mode allowing for synchronization to RF power amplifier

events or other high-current conditions, an integrated com-

parator designed to monitor an NTC thermistor and provide

an interrupt to the LED current, an input voltage monitor to

monitor low battery conditions, and a flash current scale-back

feature that actively monitors the battery voltage and opti-

mizes the flash current during low battery voltage conditions.

Additionally, an active high HWEN input provides a hardware

shutdown during system software failures.

The 2MHz switching frequency, over-voltage protection and

adjustable current limit allow for the use of tiny, low profile (1

µH or 2.2 µH) inductors and (10 µF) ceramic capacitors. The

device is available in a ultra-small 16-bump (1.97mm x

1.97mm x 0.6mm) micro SMD package and operates over the

-40°C to +85°C temperature range.

Typical Application Circuit

C-compatible interface.

301028

LM3559

Features

■

Applications

■

Dual High-Side Current Sources Allow for Grounded

Cathode LED Operation

Accurate and Programmable LED Current from 28.125mA

to 1.8A

Optimized Flash Current During Low Battery Conditions

Independent LED Current Source Programmability

>90% Efficiency

Ultra-Small (Total) Solution Size: < 26mm

Four Operating Modes: Torch, Flash, Privacy Indicate,

and Message Indicator

4-bit ADC for V

Battery Voltage Sensing and Current Scale-Back

LED Thermal Sensing and Current Scale-Back

Hardware Flash and Torch Enable

Dual Synchronization Inputs for RF Power Amplifier Pulse

Events

LED and Output Disconnect During Shutdown

Open and Short LED Detection

400 kHz I

Active Low Hardware Reset

16-Bump (1.97mm x 1.97mm x 0.6mm) micro SMD

Camera Phone LED Flash

White LED Biasing

C-Compatible Interface

LED

Monitoring

30102801

www.national.com

June 9, 2011

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