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1.2 A, 30 v voltage step-down DC/DC converter

R1244N001B is based on CMOS switch built-in DC/DC converters. Built-in top switch conduction resistance is 0.35 Ω (typical), can provide the maximum current of 1.2 A. The chip by the oscillation circuit, PWM control circuit, voltage reference source, the error amplifier, phase compensation circuit, slope, soft start circuit, protect circuit, the internal voltage regulator, switch, etc, the external device using inductance, resistance, diode, capacitor, all these constitute a complete step-down DC/DC converter.

Due to the current R1244N001B current-limiting mode does not require monitoring resistance at work, so can efficiently achieve its function at a high speed. Output capacitance choose ceramic capacitors. Switching frequency by inner fixed for the 1.25 MHz.

As a protective function, equipped with limit per cycle peak current function, output short circuit switch frequency limit in a quarter of the original back, shut off the heat, under-voltage lockout (UVLO) function.