A5973D, A5973D013TR

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A5973D
2.5 A 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 2 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 35 V 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
HSOP8 exposed pad

Description
The A5973D 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 exposed frame, that allows to reduce the Rth(JA) down to approximately 40 C/W. The device uses an internal P-channel D-MOS 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 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. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.
L1 15uH

Applications

Dedicated to automotive applications

Figure 1.

Typical application
VCC COMP
C4

VIN=4V to 35V
8 4 1 2

OUT SYNCH

Vout=3.3V

A5973D
FB 6 5 7 GND INH 3

D1 STPS340U

R1 5k6 C2 330uF 6.3V R2 3k3

C1 10uF 35V CERAMIC C3 220pF

22nF

R3 4k7

VREF 3.3V

January 2008

Rev 3

1/14
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A5973D DATASHEET