5A, ULTRA LOW DROPOUT (0.15V@5A) LINEAR REGULATOR

DESCRIPTION

The UTC LXXLD52 is a typical LDO with the features of very low

dropout voltage as low as 0.15V at output current 5A.

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 0.5V. 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 LXXLD52, 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 LXXLD52 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 (1.2V/5A) and note

book PC applications.

FEATURES

* Low Dropout VD=0.15V(typ.)@ IOUT=5A

* Low ESR Output Capacitor

* VREF=0.8V

* 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 (<30 uA)

* Shutdown/Enable Control Function