LTC3230

PRODUCTION

5-LED Main/Sub Display Driver with Dual LDO

Part Models: 2
1ku List Price: Starting From $2.08

Viewing:

Overview

Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching
Multimode Operation: 1x, 1.5x, 2x
Full-Scale Current Set Resistor
Up to 125mA Total LED Current
Single Wire Enable/Brightness Control for Main and Sub Display LEDs
32:1 Linear LED Brightness Control
Dual 200mA Linear Regulators
Four 25mA Low Dropout Main LED Current Sources
One 25mA Low Dropout Sub LED Current Source
Low Noise Constant Frequency Operation
Low Shutdown Current: 3µA
Internal Soft-Start Limits Inrush Current During Start-Up and Mode Switching
Open/Short LED Protection
No Inductors
20-Lead 3mm x 3mm QFN Package

The LTC3230 is a low noise charge pump DC/DC converter designed to drive 4 Main LEDs and 1 Sub LED, plus two 200mA linear regulators to provide additional system power. The LTC3230 charge pump requires only four small ceramic capacitors and one current set resistor to form a complete LED power supply and current controller.

Built-in soft-start circuitry prevents excessive inrush cur- rent during start-up and mode changes. High switching frequency enables the use of small external capacitors. Main and Sub full-scale current settings are programmed by a single external resistor.

Charge pump efficiency is optimized based on the voltage across the LED current sources. The part powers up in 1x mode and automatically switches to the next higher mode, 1.5x and subsequently 2x, whenever any LED current source approaches dropout.

Two 200mA linear regulators have independent enable and output voltage select pins. Each regulator can be set to one of three pre-selected output voltages with tri-level input pins. The regulators may be enabled independently of the charge pump.

The LTC3230 is available in a low profile (0.75mm) 3mm x 3mm 20-lead QFN package.

Applications

Multi-LED Driver and Dual LDO Supplies for Cell Phone, PDA, Digital Camera and PND Applications

Part Models: 2
1ku List Price: Starting From $2.08

Documentation

Data Sheet 1

LTC3230: 5-LED Main/Sub Display Driver with Dual LDO Data Sheet 01/18/2008

User Guide 1

DC1217A - Demo Manual 09/24/2009

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3230EUD#PBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3230EUD#TRPBF	LFCSP:LEADFRM CHIP SCALE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Level Translators & Buffers 1
LTC4311	PRODUCTION	Low Voltage I²C/SMBus Accelerator

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3230

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.