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B5973D：Up to 2 A step down switching regulator for automotive applications

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 R_th(JA)down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical R_DSonof 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 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.

Key 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
• Protection against feedback disconnection
• Thermal shutdown

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