L5973D - step down monolithic power switching regulator

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 2A 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 mR) 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.

Main features of L5973D

• 2.5 A internal switch
• Operating input voltage from 4V to 36V
• 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

Downloads