© Semiconductor Components Industries, LLC, 2010

November, 2010 − Rev. 2

1

Publication Order Number:

CAT3649/D

CAT3649

Driver with 32 Dimming

Levels & PWM

Description

pump that can drive up to six LEDs. The inclusion of a 1.33x fractional

charge pump mode increases the device efficiency by up to 10% over

traditional 1.5x charge pumps with no added external capacitors.

Low noise input ripple is achieved by operating at a constant

switching frequency which allows the use of small external ceramic

capacitors. The multi−fractional charge pump supports a wide range of

input voltages from 2.4 V to 5.5 V.

The LED current can be adjusted in different ways. The full−scale LED

current is set to 25 mA once the device is enabled. Analog dimming in

32 linear steps is achieved via a 1−wire pulse−dimming input (ADIM).

Further adjustment of the LED current can be done by applying a pulse

width modulation (PWM) signal on the PWM input. The PWM

dimming control is compatible with content adaptive brightness control

(CABC) for a wide range of PWM signal frequency up to 200 kHz.

The CAT3649 can be shut down by holding the ADIM or PWM

input in a logic low condition for greater than 30 ms.

ON Semiconductor’s Quad−Mode 1.33x charge pump switching

architecture is patented.

Features

Compliant

1. Typical application circuit with external components is shown in Figure 1.

http://onsemi.com

TQFN−16

HV3 SUFFIX

CASE 510AD

PIN CONNECTIONS

MARKING DIAGRAM

ADIM

LED6

LED5

LED4

C1+

C1−

C2+

C2−

1

(Top View)

JABA

AXXX

YWW

JABA = CAT3649HV3−GT2

A = Assembly Location

XXX = Last Three Digits of Assembly Lot Number

Y = Production Year (Last Digit)

WW = Production Week (Two Digits)

Device

Package

ORDERING INFORMATION

CAT3649HV3−GT2

TQFN−16

(Pb−Free)

2,000 /

Tape & Reel

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specification

Brochure, BRD8011/D.