CAT4201 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 350mA High Efficiency Step Down LED Driver

CAT4201
350 mA High Efficiency
Step Down LED Driver
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 350 mA from
supplies as high as 36 V.
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 1 MHz, 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.
http://onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
CTRL
VBAT
GND
Features
• LED Drive Current up to 350 mA
• Compatible with 12 V and 24 V Standard Systems
• Handles Transients up to 40 V
• Single Pin Control and Dimming Function
• Power Efficiency up to 94%
• Drives LED Strings of up to 32 V
• Open and Short LED Protection
• Parallel Configuration for Higher Output Current
• TSOT−23 5−lead Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
RSET
SW
(Top View)
MARKING DIAGRAMS
TFYM
TF = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
ORDERING INFORMATION
Applications
• 12 V and 24 V Lighting Systems
• Automotive and Aircraft Lighting
• General Lighting
• High Brightness 350 mA LEDs
VBAT
9 V C1
Device
Package
CAT4201TD−GT3
TSOT−23
(Pb−Free)
* Plated Finish: NiPdAu
Shipping
3,000/
Tape & Reel
Bulb Replacement
4.7 mF
VBAT
CAT4201
RSET
R1
10 kW
D: Central Schottky CMDSH05−4
L: Sumida CDRH6D26−220
See Table 4 on page 6 for external component selection.
CTRL SW
GND
Figure 1. Typical Application Circuit
D
C2
10 mF
L
22 mH
300 mA
© Semiconductor Components Industries, LLC, 2010
1
February, 2010 − Rev. 5
Publication Order Number:
CAT4201/D