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CAT4237: White LED Driver, CMOS Boost Converter, High Voltage

Datasheet: White LED Driver, CMOS Boost Converter, High Voltage
Rev. 3 (264.0kB)
Product Overview
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The CAT4237 is a DC-DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a constant switching frequency of 1 MHz 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 40 mA can be supported over a wide range of input supply voltages from 2.8 V to 5.5 V, making the device ideal for battery-powered applications. The CAT4237 high-voltage output stage is perfect for driving six, seven or eight white LEDs in series with inherent current matching in LCD backlight applications.

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, the device also enters a very low power operating mode during 'Open LED' fault conditions.
Features
 
  • Drives 6 to 8 White LEDs in series from 3 V
  • Up to 87% efficiency
  • Low Quiescent Ground Current 0.6 mA
  • Adjustable Output Current (up to 40 mA)
  • High Frequency 1 MHz Operation
  • High Voltage Power Switch
  • Shutdown current less than 1 µA
  • Open LED low power mode
  • Automatic Shutdown at 1.9 V (UVLO)
  • Thermal shutdown protection
  • Digital Still Cameras
Applications   End Products
  • Color LCD and Keypad Backlighting
  • Digital Cameras
 
  • Mobile Phones
  • Portable Gaming Systems
Technical Documentation & Design Resources
Data Sheets (1) Evaluation Board Documents (5)
Package Drawings (1)  
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
CAT4237BGEVB Active
Pb-free
High Voltage CMOS Constant-Current DC-DC Converter Evaluation Board
Availability & Samples
Specifications
Case Outlines
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
CAT4237TD-GT3 Active
Pb-free
Halide free
CAT4237 TSOT-23-5 419AE 1 260 Tape and Reel 3000 $0.5093
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14) : <100

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
VIN Min (V)
VIN Max (V)
VO Max (V)
IO Max (mA)
fSW Typ (kHz)
Package Type
CAT4237TD-GT3  
 $0.5093 
Pb
H
 Active   
Step-Up
2.8
5.5
30
100
1000
TSOT-23-5
Case Outlines
419AE   
Packages
CAT4237: White LED Driver, CMOS Boost Converter, High Voltage
CAT4237: White LED Driver, CMOS Boost Converter, High Voltage
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