 DESCRIPTION

The UTC LXXLD70 is a typical LDO with the features of very

low dropout voltage as low as 0.15V at output current 7.0A.

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 0.3V. 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 LXXLD70, 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 LXXLD70 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/7.0A) and note book PC application

 FEATURES

* Low Dropout VD= 0.15V (typ.) @ IOUT=7.0A

* Low ESR Output Capacitor

* VREF=0.8V

* ±1.5 over Line, Load and Temperature Output Accuracy

* 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)

* For Standby or Suspend Mode: Shutdown