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A5970AD Datasheet(PDF) 1 Page - STMicroelectronics |
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A5970AD Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 17 page  August 2008 Rev 2 1/16 1 A5970AD Up to 1 A switch step down switching regulator for automotive applications Features ■ Qualified following the AEC-Q100 requirements (temperature grade 3), see PPAP for more details. ■ 1 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 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 A5970AD is a step down monolithic power switching regulator with a switch current limit of 1.35 A so it is able to deliver more than 1 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 device uses an internal P-channel D-MOS transistor (with a typical RDS(on) of 250 m Ω) as switching element to avoid the use of bootstrap capacitor and guarantee high efficiency. An internal oscillator fixes the switching frequency at 500 kHz to minimize the size of external components. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all computer related applications. 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 A5970AD C1 10uF 35V CERAMIC C2 100uF 10V C3 220pF C4 22nF R1 5k6 R2 3k3 R3 4k7 D1 STPS340U L1 15uH 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 A5970AD C1 10uF 35V CERAMIC C2 100uF 10V C3 220pF C4 22nF R1 5k6 R2 3k3 R3 4k7 D1 STPS340U L1 15uH Vout=3.3V 1 2 3 4 5 6 7 8 INH SYNCH VREF 3.3V www.st.com |
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