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A5970D Datasheet(PDF) 1 Page - STMicroelectronics |
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A5970D Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 13 page  August 2008 Rev 4 1/12 1 A5970D Up to 1 A step down switching regulator for automotive applications Features ■ Qualified following the AEC-Q100 requirements (temperature grade 3), see PPAP for more details. ■ Up to 1 A DC output current ■ Operating input voltage from 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 ■ Inhibit for zero current consumption ■ Synchronization ■ Protection against feedback disconnection ■ Thermal shutdown Applications ■ Dedicated to automotive applications Description The A5970D is a step down monolithic power switching regulator capable to deliver up to 1 A at output voltages from 1.2 V to 35 V. 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 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 GND COMP VCC VIN=4.4V to 35V A5970D C1 10uF 35V CERAMIC C2 100uF 10V C3 220pF C4 22nF R1 5k6 R2 3k3 R3 4k7 D1 STPS340U L1 33uH Vout=3.3V 1 2 3 4 5 6 7 8 INH SYNCH VREF 3.3V OUT FB GND COMP VCC VIN=4.4V to 35V A5970D C1 10uF 35V CERAMIC C2 100uF 10V C3 220pF C4 22nF R1 5k6 R2 3k3 R3 4k7 D1 STPS340U L1 33uH Vout=3.3V 1 2 3 4 5 6 7 8 INH SYNCH VREF 3.3V www.st.com |
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