Analog Devices LT8603 | Demoboard DC2469A

Beschreibung

Demonstration circuit 2469A features the LT®8603 with triple monolithic buck regulators and the boost channel as SEPIC. The demo circuit is designed for 8V, 5V, 3.3V, and 1.8V outputs from a nominal 12V input. The 4th channel is set as a SEPIC converter and its output is regulated at 8V over a wide input range. The two high voltage buck regula-tors are powered from VOUT4. VOUT1 is regulated at 5V with 1.5A maximum output load current, and VOUT2 is at 3.3V with 2.5A maximum output load current. The low voltage buck is powered from VOUT2 (3.3V), and the out-put VOUT3 is regulated at 1.8V with 1.8A maximum load current. Thanks to the SEPIC converter, all four outputs can ride through a cold crank in automotive applications while providing regulated output voltages.

Eigenschaften

All regulators are synchronized to an internal oscillator that can be programmed with one resistor at RT pin. Programmable frequency allows optimization between efficiency and external component size. To avoid the audio band, the DC2469A sets the switching frequency at 2MHzfor the three buck regulators, and the SEPIC converter is at 400kHz. At all frequencies, a 180° phase shift is main-tained between 1 and 2 channels, reducing the input peak current and voltage ripple.

Weiterführende Informationen

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