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A5973ADTR Datasheet(PDF) 1 Page - STMicroelectronics |
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A5973ADTR Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 19 page  August 2008 Rev 5 1/19 19 A5973AD 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 ■ 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 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 Figure 1. Typical application Description 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 more than 1.5 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 an HSOP8 package with exposed frame, that allows to reduce the Rth(JA) down to approximately 40 °C/W. 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 500 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. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. HSOP8 exposed pad OUT FB GND COMP VCC VIN=4V to 35V A5973AD C1 10uF 35V CERAMIC C2 330uF 6.3V 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=4V to 35V A5973AD C1 10uF 35V CERAMIC C2 330uF 6.3V 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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