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CAT3649 Datasheet, PDF (1/14 Pages) ON Semiconductor – 6-Channel Quad-Mode LED Driver with 32 Dimming Levels & PWM | |||
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CAT3649
6-Channel Quad-Mode) LED
Driver with 32 Dimming
Levels & PWM
Description
The CAT3649 is a high efficiency QuadâMode® fractional charge
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 multiâfractional 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 fullâscale LED
current is set to 25 mA once the device is enabled. Analog dimming in
32 linear steps is achieved via a 1âwire pulseâdimming 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 Semiconductorâs QuadâMode 1.33x charge pump switching
architecture is patented.
Features
⢠High Efficiency 1.33x Charge Pump
⢠Quadâmode Charge Pump: 1x, 1.33x, 1.5x, 2x
⢠Drives up to 6 LEDs at 25 mA Each
⢠PWM Dimming 100 Hz to 200 kHz for CABC
⢠1âwire EZDimt 32 Linear Steps (ADIM)
⢠Power Efficiency up to 92%
⢠Low Noise Input Ripple in All Modes
⢠âZeroâ Current Shutdown Mode
⢠Soft Start and Current Limiting
⢠Short Circuit Protection
⢠Thermal Shutdown Protection
⢠3 mm x 3 mm, 16âpad TQFN Package
⢠This Device is PbâFree, Halogen Free/BFR Free and is RoHS
Compliant
Typical Applications (Note 1)
⢠LCD Display Backlight
⢠Cellular Phones
⢠Digital Still Cameras
⢠Handheld Devices
1. Typical application circuit with external components is shown in Figure 1.
http://onsemi.com
TQFNâ16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
1
C1+
C1â
C2+
C2â
ADIM
LED6
LED5
LED4
(Top View)
MARKING DIAGRAM
JABA
AXXX
YWW
JABA = CAT3649HV3âGT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
Package
Shippingâ
CAT3649HV3âGT2 TQFNâ16
(PbâFree)
2,000 /
Tape & Reel
â 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.
© Semiconductor Components Industries, LLC, 2010
1
November, 2010 â Rev. 2
Publication Order Number:
CAT3649/D
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