LTC3212 RGB LED Driver and Charge Pump

The LTC3212 is a low noise charge pump RGB LED driver capable of driving three LEDs up to 25mA each from a 2.7V to 5.5V input. Low external part count (one flying capacitor, two bypass capacitors and one to three programming resistors) makes the LTC3212 ideally suited for small, battery-powered applications.

Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. High switching frequency enables the use of small external capacitors. The charge pump shuts down to a high impedance mode to prevent LED leakage while the LTC3212 is off.

Each LED may be individually turned on or off via a single pin interface. The current through the LEDs may be individually programmed with resistors or may share a single programming resistor. White mode adjusts the red, green and blue LED current ratios for a white light when all three LEDs are programmed to be on.

LED currents are regulated using internal low dropout current sources. Automatic mode switching optimizes efﬁ ciency by monitoring the LED current drivers and switches mode only when dropout is detected. The part is available in a 3mm × 2mm 12-lead DFN package

产品特点 Features

Power and Current Control for Driving RGB LEDs
Individually Programmable Current Sources
1x or 2x Mode, Low Noise, Constant Frequency Charge Pump
Single Wire Enable Control for All LEDs
White Mode Adjusts R, G, B Currents for White Light
25mA Maximum LED Current
VIN Range: 2.7V to 5.5V
Automatic Soft-Start, Mode Switching and Output Disconnect in Shutdown Mode
Available in 12-Lead (3mm × 2mm) DFN Package

应用

Cellular Phones
Media Players
RGB Back Lights

典型应用图

参数

LTC3212 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3212EDDB#PBF	DFN	12	E	$1.86
LTC3212EDDB#TRMPBF	DFN	12	E	$1.86	$1.35
LTC3212EDDB#TRPBF	DFN	12	E	$1.86	$1.30

LTC3212 数据手册及相关资料下载

数据手册(英文) : LTC3212 - RGB LED Driver and Charge Pump.PDF
可靠性数据 : R415 Reliability Data .PDF