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This is information on a product in full production.
November 2015 DocID13957 Rev 9 1/41
A5973D
Up to 2 A step-down switching regulator for automotive applications
Datasheet - production data
Features
Qualified following the AEC-Q100
requirements (see PPAP for more details)
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
Applications
Dedicated to automotive applications
Description
The A5973D is a step-down monolithic power
switching regulator with a minimum switch current
limit of 2.25 A so it is able to deliver up to 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 HSOP8 package with
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 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. 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
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