LTC3220/LTC3220-1

1

32201fc

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

360mA Universal

18-Channel LED Driver

The LTC3220/LTC3220-1 are highly integrated multi-display

LED drivers. These parts contain a high efficiency, low noise

charge pump to provide power to up to eighteen universal

LED current sources. The LTC3220/LTC3220-1 require

only five small ceramic capacitors to form a complete

LED power supply and current controller.

The LED currents are set by an internal precision cur-

rent reference. Independent dimming, on/off, blinking

and gradation control for all universal current sources

are available to adjust brightness levels independently for

each universal LED current source.

The LTC3220/LTC3220-1 charge pump optimizes efficiency

based on the voltage across the LED current sources. The

part powers up in 1x mode and will automatically switch

to boost mode whenever any enabled LED current source

begins to enter dropout. The first dropout switches the

parts into 1.5x mode and a subsequent dropout switches

the LTC3220/LTC3220-1 into 2x mode. The parts reset to

64-Step Linear Brightness Control

Gradation Control for Each Current Source Using

Provides Up to 91% Efficiency

Radiated Noise (EMI)

Reset of All Data Registers

LTC3220-1: 0011101)

× 4mm Ultrathin (0.55mm) 28-Lead QFN

Package

L, 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.

RESET

0.1μF

C1P

SCL/SDA

C1

2.2μF

C2

2.2μF

C3

2.2μF

CPO

ULED1-18

C1M

GND

C2P

LTC3220

LTC3220-1

C2M

C4

4.7μF

RGB1

3220 TA01

18

RST

RGB2

RGB3

RGB4

MAIN

6-LED Main, 4 RGB LEDs