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A5974AD：Up to 2 A step down switching regulator for automotive applications

The A5974AD is a step-down monolithic power switching regulator with a minimum switch current limit of 2.5 A, it is therefore 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 a HSOP8 package with exposed frame, that allows to reduce the RTHJ-A down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical RDS(on) of 250 mΩ) as 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 only 4 V, it fits automotive applications requiring device operation even in cold crank conditions. 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)
• 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
• 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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