AN1517 Datasheet, PDF (1/30 Pages) STMicroelectronics – Designing with the STEVAL-ISA089V1 high efficiency DC-DC

AN1517
Application note
Designing with the STEVAL-ISA089V1 high efficiency DC-DC
converter
By Massimiliano Merisio
Introduction
The L5972D device is a step-down monolithic power switching regulator capable of
delivering up to 2 A at output voltages from 1.235 V to 35 V. The operating input voltage
ranges from 4.4 V to 36 V. The device has been designed using BCDV technology and the
power switching element is implemented through a P-channel DMOS transistor. It does not
require a bootstrap capacitor, and the duty cycle can range up to 100%. An internal
oscillator fixes the switching frequency at 250 kHz. This minimizes the LC output filter.
Pulse-by-pulse and frequency foldback overcurrent protection offer effective protection
against short-circuit. Other features are voltage feed-forward, protection against feedback
disconnection, and thermal shutdown. The device is housed in a thermally improved SO-8
package (with 4 pins connected to GND so that the thermal resistance junction to ambient is
reduced to approximately one-half compared with a standard SO-8 package.
Figure 1. Demonstration board
STEVAL-ISA089V1 (SO-8) board dimensions: 34 x 43 mm
Figure 2. Package
Figure 3. Pin connection
SO-8
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November 2013
DocID8827 Rev 3
1/30
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