A5970D013TR Datasheet, PDF (1/41 Pages) STMicroelectronics – Up to 1 A step down switching regulator for automotive applications

A5970D
Up to 1 A step down switching regulator
for automotive applications
Features
■ Qualified following the AEC-Q100
requirements (see PPAP for more details)
■ 1 A DC output current
■ Operating input voltage from 4 V to 36 V
■ 3.3 V / (±2%) reference voltage
■ Output voltage adjustable from 1.235 V to V_IN
■ 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
Application
■ Dedicated to automotive applications
Figure 1. Application schematic
V_IN=4 to 36V
SO8
Description
The A5970D is a step down monolithic power
switching regulator with a minimum switch current
limit of 1.35 A so it is able to deliver up to 1 A DC
current to the load depending on the application
conditions. The output voltage can be set from
1.235 V to V_IN.
The device uses an internal p-channel DMOS
transistor (with a typical R_DS(on) 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 fits the automotive applications
requiring the device operation even in cold crank
conditions. Pulse by pulse current limit with the
internal frequency modulation offers an effective
constant current short circuit protection.
V_OUT=3.3V
November 2009
Doc ID 13955 Rev 6
1/41
www.st.com
41