LTC3212EDDB 查看數據表（PDF） - Linear Technology

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LTC3212EDDB

RGB LED Driver and Charge Pump

Linear Technology 

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

Applications

■ Cellular Phones

■ Media Players

■ RGB Back Lights

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6411531.

LTC3212

RGB LED Driver and

Charge Pump

Description

The LTC®3212 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 cur-

rent 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 indi-

vidually 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

efficiency 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.

Typical Application

RGB Power Supply and Current Control

1µF

VIN

2.7V TO 5.5V

1µF

11.8k

CM

CP

VIN

CPO

LTC3212

R

LEDR

LEDEN

ISETB

ISETR

ISETG

LEDG

LEDB

G

B

1µF

INDIVIDUAL WHITE

SETTINGS MODE

LEDR

LEDG

LEDB

15mA

15mA

15mA

13.5mA

15mA

11.2mA

3212 TA01a

3212fb



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