MIC3809BM

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The MIC3809BM is an advanced DC DC switching controller designed to provide high-precision power conversion in a wide range of application fields. It is capable of delivering up to 5 A maximum and is an ideal choice for powering applications involving high-precision power management in battery-powered and automotive systems. This highly efficient and flexible solution is available in a small, 3 mm x 3 mm package, making it an ideal choice for space-constrained designs.

The MIC3809BM DC-DC switching controller has a wide input voltage range of up to 32 V, complies with the EN61000-4-4 standard for surge/transient protection, and features low-noise operation. The device also features an adaptive dead-time control that helps reduce EMI, as well as programmable soft-stop, which prevents transient overshoots during shutdown; both are important features for the reliable operation of power systems.

The working principle of the MIC3809BM is based on pulse width modulation (PWM) technology. At the heart of this device is a PWM oscillator and comparator that generate pulses of varying width at frequencies up to 1 MHz. These pulses, after passing through other circuitry, are supplied to a power MOSFET or IGBT that acts as the switch when connected to a DC power source on the input side and a DC load on the output side. As the frequency and pulse width of the PWM signal varies, the output signal will adjust accordingly, providing precisely tuned power delivery.

The MIC3809BM features an integrated programmable-scaling digital voltage feedback control loop. It takes an analog voltage at the FB pin and filters it with a programmable scaling value and a fixed gain of 10 V/V. The selected options can achieve a large range of DC voltages. The output voltage of the MIC3809BM is adjustable with a ±0.9% accuracy, giving the flexibility to precisely tune output voltage. This integrated digital control loop also provides excellent load-line and power supply rejection.

In addition, the MIC3809BM includes internal fault detection, which provides real-time monitoring and protection of power stages and other peripherals. It features an under-voltage lockout that prevents startup if the supply voltage is lower than the specified limit and a current limiter for protection against overloads. The device is also fully automated, with a programmable current sense amplifier for integrated over-current protection.

Overall, the MIC3809BM DC-DC switching controller is an excellent choice for powering a wide range of applications. Its high-precision power conversion, advanced fault detection, integrated digital control loop, and small package size make it an ideal solution for battery-powered and automotive systems.

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