下载
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 4
1 Publication Order Number:
CAT3637/D
CAT3637
6-Channel Programmable
High Efficiency LED Driver
Description
The CAT3637 is a high efficiency 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 1.33x, charge pump switching architecture is
patented.
Features
• High Efficiency 1.33x Charge Pump
• 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
MARKING DIAGRAM
Device Package Shipping
†
ORDERING INFORMATION
CAT3637HV3−GT2
(Note 1)
TQFN−16
(Pb−Free)
2000 /
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1. NiPdAu Plated Finish (RoHS−compliant).
EN/SET
GND
NC
NC
C2−
C2+
C1−
C1+
LED6
LED5
LED4
LED3
LED2
LED1
VOUT
VIN
1
(Top View)
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)
页面指南
