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CAT4238

Features: ` Drives High Voltage LED strings (38V)` Up to 87% Efficiency` Low Quiescent Ground Current 0.6mA` Adjustable Output Current` 1MHz Fixed Frequency Low noise Operation` Soft start in-rush current limiting` Shutdown current less than 1A` Open LED Overvoltage Protection` Automatic Shutdow...

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SeekIC No. : 004310655 Detail

CAT4238: Features: ` Drives High Voltage LED strings (38V)` Up to 87% Efficiency` Low Quiescent Ground Current 0.6mA` Adjustable Output Current` 1MHz Fixed Frequency Low noise Operation` Soft start in-rush ...

CAT4238 Data Sheet

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Part Number:
CAT4238
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/7/26

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Product Details

Description



Features:

` Drives High Voltage LED strings (38V)
` Up to 87% Efficiency
` Low Quiescent Ground Current 0.6mA
` Adjustable Output Current
` 1MHz Fixed Frequency Low noise Operation
` Soft start "in-rush" current limiting
` Shutdown current less than 1A
` Open LED Overvoltage Protection
` Automatic Shutdown at 1.9V (UVLO)
` Thermal overload protection
` Thin SOT23 5-Lead (1mm max height)


Application

· GPS Navigation Systems
· Portable Media Players
· Handheld Devices, Digital Cameras
· Portable Game Machines


Pinout

Connection Diagram


Specifications

Parameters
Ratings
Units
VIN, FB voltage
-0.3 to +7
V
SHDN voltage
-0.3 to +7
V
SW voltage
-0.3 to 45
V
Storage Temperature Range
-65 to +160
Junction Temperature Range
-40 to +125
Lead Temperature
300



Description

The CAT4238 is a DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs.Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. LED currents up to 40mA can be supported over a wide range of input supply voltages up to 5.5V, making the device ideal for battery-powered applications. The CAT4238 high-voltage output stage is perfect for driving mid-size and large panel displays containing up to ten white LEDs in series.

CAT4238 LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with "zero" quiescent current.

In addition to thermal protection and overload current limiting, CAT4238 also enters a very low power operating mode during "Open LED" fault conditions. The device is housed in a low profile (1mm max height) 5-lead thin SOT23 package for space critical applications.




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