CAT4137: White LED Driver, CMOS Boost Converter
Description: The CAT4137 is a DC/DC step-up converter that deli...
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.
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
Digital Still Cameras
Technical Documentation & Design Resources
Evaluation/Development Tool Information
Product Change Notification
Availability and Samples
Compliance: Pb-free Halide free
Description: White LED Driver, CMOS Boost Converter
Package Type: TSOT-23-5
Package Case Outline: 419AE
Container Type: REEL
Container Qty: 3000
Market Leadtime (weeks):4 to 8
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