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
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.
Package
Marking
TF
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
TSOT-23 5-lead
CTRL
GND
RSET
1
2
3
CAT4201
4
SW
5
VBAT
TYPICAL APPLICATION CIRCUIT
VBAT
9V
C1
4.7µF
VBAT
D
Bulb Replacement
C2
300mA
10µF
L
CAT4201
R1
RSET
CTRL
GND
SW
(Top View)
10kΩ
22µH
D: Central Schottky CMDSH05-4
L: Sumida CDRH6D26-220
See Table 1 on page 6 for external component selection.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5025 Rev. D
CATALYST [ CATALYST SEMICONDUCTOR ]
