Description:

The L5973D is a step down monolithic powerswitching regulator with a minimum switch currentlimit of 2.5 A so it is able to deliver more than 2 ADC current to the load depending on theapplication conditions.The output voltage can be set from 1.235 V to35 V. The high current level is also achievedthanks to an SO8 package with exposed frame,that allows to reduce the Rth(j-amb) down toapproximately 40 °C/W.The device uses an internal P-channel D-MOStransistor (with a typical Rdson of 250 mΩ) asswitching element to minimize the size of theexternal components.An internal oscillator fixes the switching frequencyat 250 kHz.Having a minimum input voltage of 4 V only, it isparticularly suitable for 5 V bus, available in allcomputer related applications.Pulse by pulse current limit with the internalfrequency modulation offers an effective constantcurrent short circuit protection.

Features:

■ 2.5 A internal switch

■ Operating input voltage from 4 V to 36 V

■ 3.3 V / (±2%) reference voltage

■ Output voltage adjustable from 1.235 V to 35 V

■ Low dropout operation: 100 % duty cycle

■ 250 kHz internally fixed frequency

■ Voltage feedforward

■ Zero load current operation

■ Internal current limiting

■ Inhibit for zero current consumption

■ Synchronization

■ Protection against feedback disconnection

■ Thermal shutdown

Applications:

■ Consumer: STB, DVD, TV, VCR, car radio,LCD monitors

■ Networking: XDSL, modems, DC-DC modules

■ Computer: printers, audio/graphic cards,optical storage, hard disk drive

■ Industrial: changers, car battery, DC-DCconverters