STMicroelectronics L5973D

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 ADC 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.

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 shutdownRemarks:-Refer page no 17Table 5.Inductor selection

Typical applications

• Industrial: changers, car battery, DC-DC
• Consumer: STB, DVD, TV, VCR, car radio,
• Computer: printers, audio/graphic cards,
• Networking: XDSL, modems, DC-DC modules

More information

• Datasheet
• IC product information