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This is information on a product in full production.
August 2014 DocID13958 Rev 9 1/40
A5973AD
Up to 1.5 A step-down switching regulator for automotive
applications
Datasheet - production data
Features
Qualified following the AEC-Q100
requirements (see PPAP for more details)
1.5 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
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
Applications
Dedicated to automotive applications
Description
The A5973AD is a step-down monolithic power
switching regulator with a minimum switch current
limit of 1.8 A, so it is able to deliver up to 1.5 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 high current level is also
achieved thanks to an HSOP8 package with an
exposed frame, that allows to reduce the R
th(JA)
down to approximately 40 °C/W. The device uses
an internal P-channel DMOS transistor (with
a typical R
DS(on)
of 250 m) as a switching
element to minimize the size of the external
components. An internal oscillator fixes the
switching frequency at 500 kHz. Having
a minimum input voltage of 4 V only it fits the
automotive applications requiring the device
operation even in cold crank conditions. A pulse-
by-pulse current limit with the internal frequency
modulation offers an effective constant current
short-circuit protection.
HSOP8 - exposed pad
Figure 1. Application schematic
A5973AD
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