CAT4201TD-GT3 Datasheet, PDF (1/15 Pages) ON Semiconductor – 350mA High Efficiency Step Down LED Driver

CAT4201
350mA High Efficiency Step Down LED Driver
FEATURES
„ LED drive current up to 350mA
„ Compatible with 12V and 24V standard systems
„ Handles transients up to 40V
„ Single Pin Control and Dimming function
„ Power Efficiency up to 94%
„ Drives LED strings of up to 32V
„ Open and short LED protection
„ Parallel configuration for higher output current
„ RoHS-compliant TSOT-23 5-lead package
APPLICATIONS
„ 12V and 24V Lighting Systems
„ Automotive and Aircraft Lighting
„ General lighting
„ High Brightness 350mA LEDs
ORDERING INFORMATION
Part Number
CAT4201TD-GT3
* Plated Finish: NiPdAu
Quantity
per Reel
3000
PIN CONFIGURATION
Package
Marking
TF
TSOT-23 5-lead
CTRL 1
5 VBAT
GND 2 CAT4201
RSET 3
4 SW
(Top View)
DESCRIPTION
The CAT4201 is a high efficiency step-down converter
optimized to drive high current LEDs. A patented
switching control algorithm allows highly efficient and
accurate LED current regulation. A single RSET
resistor sets the full scale LED string current up to
350mA from supplies as high as 36V.
The switching architecture of the CAT4201 results in
extremely low internal power dissipation allowing the
device to be housed in a tiny package without the
need for dedicated heat sinking. The device is
compatible with switching frequencies of up to 1MHz,
making it ideal for applications requiring small footprint
and low value external inductors.
Analog dimming and LED shutdown control is
provided via a single input pin, CTRL. Additional
features include overload current protection and
thermal shutdown. The device is available in the low
profile 5-lead thin SOT23 package and is ideal for
space constrained applications.
For Ordering Information details, see page 14.
TYPICAL APPLICATION CIRCUIT
Bulb Replacement
VBAT
9V C1
4.7µF
R1
10kΩ
VBAT
CAT4201
RSET
CTRL
SW
GND
D
C2
10µF
L
22µH
300mA
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
D: Central Schottky CMDSH05-4
L: Sumida CDRH6D26-220
See Table 1 on page 6 for external component selection.
1
Doc. No. MD-5025 Rev. E