STMicroelectronics R5973AD

Description

The R5973AD is a step-down monolithic powerswitching regulator with a minimum switch currentlimit of 1.8 A, so it is able to deliver up to 1.5 A DCcurrent to the load depending on the applicationconditions. The output voltage can be set from1.235 V to VIN. The high current level is alsoachieved thanks to an HSOP8 package with anexposed frame, that allows to reduce the Rth(JA)down to approximately 40 °C/W. The device usesan internal P-channel DMOS transistor (witha typical RDS(on) of 250 m) as a switchingelement to minimize the size of the externalcomponents. An internal oscillator fixes theswitching frequency at 500 kHz. The largeambient temperature range makes it ideal foraerospace and defense applications. A pulse-bypulsecurrent limit with the internal frequencymodulation offers an effective constant currentshort-circuit protection.

Features

 General features– 1.5 A DC output current– Operating input voltage from 4 V to 36 V– 3.3 V / (± 2%) reference voltage– Large ambient temperature range:

• 40 °C to 125 °C– Output voltage adjustable from 1.235 V toVIN– Low dropout operation: 100% duty cycle– 500 kHz internally fixed frequency– Voltage feed-forward– Zero load current operation– Internal current limiting– Inhibit for zero current consumption– Synchronization– Protection against feedback disconnection– Thermal shutdown
• Aerospace and defense features– Suitable for use in aerospace and defenseapplications– Dedicated traceability and part marking– Production parts approval documentsavailable– Adapted extended life time andobsolescence management– Extended product change notificationprocess– Designed and manufactured to meet subppmquality goals– Advanced mold and frame designs forsuperior resilience in harsh environments(acceleration, EMI, thermal, humidity)– Extended screening capability on request

Typical applications

• Dedicated to aerospace and defense applications

More information

• Datasheet
• IC product information