A5972D, A5972D013TR

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A5972D
2A switch step down switching regulator for automotive applications
Features

Qualified following the AEC-Q100 requirements (temperature Grade 3), see PPAP for more details. Temperature range -40 C to 85 C 1.5 A DC output current Operating input voltage from 4.4 V to 36 V 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 Protection against feedback disconnection Thermal shutdown
SO8

Description
The A5972D is a step down monolithic power switching regulator with a minimum switch current limit of 2 A so it is able to deliver more than 1.5 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 device uses an internal P-channel DMOS transistor (with a typical Rdson of 250 m) 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 4.4 V only, it is particularly suitable for 5 V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

Applications

Dedicated to automotive applications

Figure 1.

Typical application
L1 33uH

VIN=4.4V to 35V
VCC COM P OUT

VO U T=3.3V

C4 C1 10uF C3 220pF 4.7K R3 22nF

A5972D
GND FB

D1 STPS2L40U

R1 5.6K

C2 100uF

R2 3.3K

November 2007

Rev 2

1/12
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A5972D DATASHEET