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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.
http://onsemi.com
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.
5
1
TSOT ? 23
TD SUFFIX
CASE 419AE
8
1
SOIC ? 8**
V SUFFIX
CASE 751BD
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 8 ? lead SOIC package
and the low profile 5 ? lead thin SOT23 package ideal for space
constrained applications.
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 and SOIC 8 ? lead Packages
? These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
? 12 V and 24 V Lighting Systems
? Automotive and Aircraft Lighting
? General Lighting, High Brightness 350 mA LEDs
PIN CONNECTIONS AND
MARKING DIAGRAMS (Top Views)
1
CTRL VBAT
GND
RSET SW
TSOT ? 23
TF = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month: (1 ? 9, O, N, D)
1
PGND PGND
VBAT CTRL
SW GND
SW RSET
SOIC ? 8
4201A = Specific Device Code
A = Assembly Location
Y = Production Year (Last Digit)
M = Production Month: (1 ? 9, O, N, D)
XXX = Last Three Digits of Assembly Lot Number
G = Pb ? Free Package
SW
VBAT
9V C1
4.7 m F
R1
10 k W
CAT4201
VBAT
RSET
CTRL
GND
D
C2
10 m F
L
22 m H
300 mA
ORDERING INFORMATION
Device Package Shipping
CAT4201TD ? GT3 TSOT ? 23 3,000/
(Pb ? Free) Tape & Reel
CAT4201V ? GT3** SOIC ? 8 3,000/
(Pb ? Free) Tape & Reel
D: ON Semiconductor MBR0540
L: Sumida CDRH6D26 ? 220
See Table 4 on page 6 for external component selection.
Figure 1. Typical Application Circuit
* Plated Finish: NiPdAu
** For availability, contact factory
? Semiconductor Components Industries, LLC, 2011
May, 2011 ? Rev. 8
1
Publication Order Number:
CAT4201/D
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