荣盛电子(香港)有限公司

L5973D013TR

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-DC converters

Description
The L5973D is a step down monolithic power switching regulator with a minimum switch current
limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions.
The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved
thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to
approximately 40 °C/W. The device uses an internal P-channel D-MOS
transistor (with a typical Rdson of 250 mΩ) as switching element to minimize the size of the
external components. An internal oscillator fixes the switching frequency at 250 kHz.
Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all
computer related applications. Pulse by pulse current limit with the internal
frequency modulation offers an effective constant current short circuit protection.