IS32LT3178
DESCRIPTION
The IS32LT3177 and IS32LT3178 are adjustable linear current devices with excellent temperature stability. A single resistor is all that is required to set the operating current from 10m A to 200m A. The devices can operate from an input voltage from 2.9V to 40V with a minimal voltage headroom of 1.0V (Typ.) at 150m A. Designed with a low dropout voltage; the device can drive LED strings close to the supply voltage without switch capacitors or inductors.
The IS32LT3177/78 simplifies designs by providing a stable current without the additional requirement of inductors, FETs or diodes. The plete constant current driver requires only a current set resistor and a small PCB area making designs both efficient and cost effective.
The EN Pin of the IS32LT3177 can be tied to VBAT or PSM (Power Supply Modulation) signal for high side dimming. The EN Pin of the IS32LT3178 can function as the PWM signal input used for MCU PWM dimming.
As a current sink it is ideal for LED lighting...
