CAT4137TD-GT3 Electronic Components

low profile (1mm max height) 5-lead thin SOT23 package for space critical applications.

very low power operating mode during 'Open LED' fault conditions. The device is housed in a

In addition to thermal protection and overload current limiting, the device also enters a

with 'zero' quiescent current.

(PWM) signal. The shutdown control pin allows the device to be placed in power-down mode

LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation

powered applications.

wide range of input supply voltages from 2.2V to 5.5V, making the device ideal for battery-

resistor R1 sets the output current and allows up to 30mA current to be supported over a

current to control the LEDs with inherent uniform brightness and matching. An external

The device drives a string of white LEDs connected in series and provides the regulated

value external ceramic capacitors and inductor.

Operation at a constant switching frequency of 1MHz allows the device to be used with small

The CAT4137 is a DC/DC step-up converter that delivers a regulated output current.