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ST Microelectronics - 2A step down switching regulator

Numéro de référence B5973D
Description 2A step down switching regulator
Fabricant ST Microelectronics 
Logo ST Microelectronics 





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B5973D fiche technique
B5973D
2 A step down switching regulator for automotive applications
Datasheet - production data
Protection against feedback disconnection
Thermal shutdown
HSOP8 - exposed pad
Applications
Dedicated to automotive applications
Features
Qualified following the AEC-Q100
requirements (temperature Grade 1), 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
Description
The B5973D 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 (i.e. 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
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 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.
Figure 1. Typical application
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December 2013
This is information on a product in full production.
DocID14117 Rev 4
1/44
www.st.com

PagesPages 30
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