CAT4137: White LED Driver, CMOS Boost Converter

Datasheet: White LED Driver, CMOS Boost Converter
Rev. 3 (164.0kB)
Product Overview
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The CAT4137 is a DC/DC step-up converter that delivers a regulated output current. Operation at a constant switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor.

The device drives a string of white LEDs connected in series and provides the regulated current to control the LEDs with inherent uniform brightness and matching. An external resistor R1 sets the output current and allows up to 30 mA current to be supported over a wide range of input supply voltages from 2.2 V to 5.5 V, making the device ideal for battery-powered applications.

LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown control 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. The device is housed in a low profile (1 mm max height) 5-lead thin SOT23 package for space critical applications.
Features
 
  • Drives up to 5 White LEDs from 3V
  • Power Efficiency up to 87%
  • Low Quiescent Ground Current 0.1 mA
  • Adjustable Output Current (up to 30 mA)
  • High Frequency 1MHz Operation
  • “Zero” current shutdown mode
  • Operates down to 2 V (from two AA batteries)
  • Soft start power-up
  • Open LED low power mode
  • Automatic shutdown at 1.9 V (UVLO)
  • Thermal shutdown protection
Applications   End Products
  • LCD Backlighting
 
  • Mobile Phones
  • Digital Still Cameras
Technical Documentation & Design Resources
Data Sheets (1) Package Drawings (1)
Availability & Samples
Specifications
Case Outlines
Application Diagram
Interactive Block Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
CAT4137TD-GT3 Active
Pb-free
Halide free
CAT4137 TSOT-23-5 419AE 1 260 Tape and Reel 3000 $0.4916
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14) : >1K

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
VIN Min (V)
VIN Max (V)
VO Max (V)
IO Max (mA)
fSW Typ (kHz)
Package Type
CAT4137TD-GT3  
 $0.4916 
Pb
H
 Active   
Step-Up
2.2
5.5
24
30
1000
TSOT-23-5
Case Outlines
419AE   
Packages
CAT4137: White LED Driver, CMOS Boost Converter
CAT4137: White LED Driver, CMOS Boost Converter
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