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A5973AD：Up to 1.5 A step down switching regulator for automotive applications

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 mΩ) 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.

Key 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 VIN
• 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

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