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A5972D Datasheet(PDF) 1 Page - STMicroelectronics |
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A5972D Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 11 page  May 2008 Rev 3 1/11 1 A5972D Up to 1.5 A step down switching regulator for automotive applications Features ■ Qualified following the AEC-Q100 requirements (temperature grade 3), see PPAP for more details. ■ Temperature range -40 °C to 85 °C ■ 1.5 A DC output current ■ Operating input voltage from 4.4 V to 36 V ■ 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 ■ Protection against feedback disconnection ■ Thermal shutdown Applications ■ Automotive applications Description The A5972D is a step down monolithic power switching regulator with a minimum switch current limit of 1.8 A so it is able to deliver more than 1.5 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235V to 35V. The device uses an internal P-channel D-MOS 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 250 kHz. Having a minimum input voltage of 4.4 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. SO-8 Figure 1. Application schematic OUT FB GN D COM P VCC VIN =4.4V to 35V A5972D 4.7K Ω C1 10uF C2 100uF C3 220pF C4 22nF R1 5.6K R2 3.3K R3 D1 STPS2L40U 33uH VO U T=3.3V OUT FB GN D COM P VCC VIN =4.4V to 35V A5972D 4.7K Ω C1 10uF C2 100uF C3 220pF C4 22nF R1 5.6K R2 3.3K R3 D1 STPS2L40U 33uH VO U T=3.3V www.st.com |
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