L5973D:35V, 250kHz, Pinout and Datasheet

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 the exposed frame, that allows reducing the Rth(jamb) down to approximately 40°C/W.

The device uses an internal P-channel D  -MOS transistor (with a typical Rdson of 250  mΩ) as a 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 a 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. 

L5973D Absolute maximum ratings

L5973D Symbol

L5973D Footprint

L5973D 3D Model

L5973D Electrical characteristics

STMicroelectronics L5973D technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics L5973D.

L5973D Typical characteristics

■ 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 loads current operation

■ Internal current limiting

■ Inhibit for zero  current consumption

■ Synchronization

■ Protection against feedback disconnection 

■ Thermal shutdown

In order to meet environmental requirements, ST offers these devices in ECOPACK  ® packages. These packages have a Lead-free second-level interconnect. The category of second-level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label,  ECOPACK  is an ST trademark. 

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