3A ULTRA LOW DROPOUT LINEAR REGULATOR

DESCRIPTION

The UTC LXXLD38 is a typical LDO with the features of very low

dropout voltage as low as 0.20V at output current 3A.

For normal operation, two supply voltages are necessary. One

called control voltage from other equipment can shutdown the

output voltage and it should pull and hold the voltage of EN pin less

than 0.4V. Another one is the main supply voltage whose purpose is

for main power conversion, to keep the power dissipation low, and

to make the dropout voltage lower.

Internally, in the UTC LXXLD38, there’re many functions which

can be seen in the block figure to prevent the IC from being

damaged. Internal Power-On-Reset (POR) circuit can control the

two supply voltages to prevent fault operations of the circuit; the

thermal shutdown circuit is able to protect the device from over

thermal operation, and a current limit function will keep the device

work safely under current over-loads.

The UTC LXXLD38 can be used as an ideal to provide well

supply voltage in the applications, such as front-side-bus

termination on motherboard, NB applications, front side bus VTT

(1.0V/3A) and note book PC applications.

FEATURES

* Low Dropout VD=0.20V(typ.)@ IOUT=3A

* Low ESR Output Capacitor

* VREF=0.5V

* Fast Transient Response

* Output Voltage Adjustable through External Resistors

* POR(Power-On-Reset) controlling VCNTL and VIN

* With internal Soft-Start

* Internal Current Limit Protection

* Internal Under Voltage Protection

* Hysteretic Thermal Shutdown

* With Power-OK Output (with a Delay Time)

* Low Shutdown Quiescent Current (<30µA)

* Shutdown/Enable Control Function