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CAT4201

ON Semiconductor
Part Number CAT4201
Manufacturer ON Semiconductor
Description 350 mA High Efficiency Step Down LED Driver
Published Aug 9, 2010
Detailed Description CAT4201 350 mA High Efficiency Step Down LED Driver Description The CAT4201 is a high efficiency step−down converter o...
Datasheet PDF File CAT4201 PDF File

CAT4201
CAT4201

Overview
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 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 Package • 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 VBAT 9 V C1 4.
7 mF R1 10 kW CAT4201 VBAT RSET CTRL SW GND D C2 10 mF L 22 mH D: ON Semiconductor MBR0540 L: Sumida CDRH6D26−220 See Table 4 on page 6 for external component selection.
Figure 1.
Typical Application Circuit 300 mA www.
onsemi.
com 5 1 TSOT−23 TD SUFFIX CASE 419AE PIN CONNECTIONS AND MARKING DIAGRAMS (Top Views) 1 CTRL VBAT TFYM GND RSET SW TSOT−23 TF = Specific Device Code Y = Production Year (Last Digit) M = Production Month: (1−9, ...


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