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.
Features
http://onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
CTRL
GND
RSET
(Top View)
SW
VBAT
•
•
•
•
•
•
•
•
•
•
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
12 V and 24 V Lighting Systems
Automotive and Aircraft Lighting
General Lighting
High Brightness 350 mA LEDs
VBAT
9V
C1
MARKING DIAGRAMS
TFYM
TF = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
ORDERING INFORMATION
Device
CAT4201TD−GT3
Package
TSOT−23
(Pb−Free)
Shipping
3,000/
Tape & Reel
Applications
•
•
•
•
* Plated Finish: NiPdAu
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.
D
C2
10
mF
L
300 mA
CTRL
SW
GND
22
mH
Figure 1. Typical Application Circuit
©
Semiconductor Components Industries, LLC, 2010
February, 2010
−
Rev. 5
1
Publication Order Number:
CAT4201/D
ONSEMI [ ON SEMICONDUCTOR ]
