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AN1723 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN1723 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 24 page June 2012 Doc ID 9553 Rev 4 1/24 AN1723 Application note Designing with the L5973AD high efficiency DC-DC converter Introduction The L5973AD is a step-down monolithic power switching regulator capable of delivering up to 2 A at output voltages from 1.235 V to 35 V. The operating input voltage ranges from 4.4 V to 36 V. It is realized in BCDV technology and the power switching element is realized by a P-channel D-MOS transistor. It doesn’t require a bootstrap capacitor, and the duty cycle can range up to 100%. An internal oscillator fixes the switching frequency at 500 kHz which minimizes the LC output filter. The synchronization pin is available in case a higher frequency is required. Pulse-by-pulse and frequency foldback overcurrent protection offer an effective short-circuit protection. Other features include voltage feed-forward, protection against feedback disconnection, and inhibit and thermal shutdown. The device is housed in a HSOP8 package with exposed pad that helps to reduce the thermal resistance junction to ambient (RThj-a) down to approximately 40 °C/W. Figure 1. EVAL5973AD demonstration board www.st.com |
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