CAT3637 Datasheet, PDF (1/14 Pages) Catalyst Semiconductor – 6-Channel Programmable High Efficiency Quad-Mode™ LED Driver

CAT3637
6-Channel Programmable
High Efficiency
Quad-Mode⁾ LED Driver
Description
The CAT3637 is a high efficiency Quad−Mode fractional charge
pump that can drive up to six LEDs programmable by a 1−wire digital
interface. The inclusion of a 1.33x fractional charge pump mode
increases 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 2.5 V to 5.5 V.
The EN/SET logic input functions as a chip enable and a digital
programming interface for setting the current in the LED channels.
The 1−wire pulse−programming interface supports 15 linear steps
from zero current to 30 mA full−brightness in 2 mA steps.
The device is available in a tiny 16−pad TQFN 3 x 3 mm package
with a maximum height of 0.8 mm.
ON Semiconductor’s Quad−Mode 1.33x, charge pump switching
architecture is patented.
Features
• High Efficiency 1.33x Charge Pump
• Quad−Mode Charge Pump: 1x, 1.33x, 1.5x, 2x
• Drives 6 LEDs Between 30 mA and 0 mA Each
• 1−wire EZDimt Interface with 2 mA Step
• Power Efficiency up to 92%
• Low Noise Input Ripple in All Modes
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
• Thermal Shutdown Protection
• Tiny 3 mm x 3 mm, 16−pad TQFN Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
1
LED6
C2−
LED5
C2+
LED4
C1−
LED3
C1+
(Top View)
MARKING DIAGRAM
JAAM
AXXX
YWW
JAAM = CAT3637HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
CAT3637HV3−GT2
(Note 1)
Package
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
1
April, 2010 − Rev. 3
Publication Order Number:
CAT3637/D