BD9E104FJ datasheet(2/33 Pages) ROHM

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TSZ02201-0F3F0AJ00170-1-2

11.Dec.2017 Rev.001

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BD9E104FJ

PGND

BOOT

VIN

AGND

COMP

Pin Configuration

Pin Descriptions

Pin No.

Pin Name

Description

BOOT

Connect a bootstrap capacitor of 0.1 µF between this pin and the SW pin.

The voltage of this capacitor is the gate drive voltage of the High Side MOSFET.

VIN

Power supply pin for the switching regulator and control circuit.

Connecting a 10 µF ceramic capacitor is recommended.

Turning this pin signal low-level (0.8 V or lower), the device is forced to be in the shutdown

mode. Turning this pin signal high-level (2.5 V or higher) enables the device. This pin must

be terminated.

AGND

Ground pin for the control circuit.

Inverting input node for the gm error amplifier.

See page 21 for how to calculate the resistance of the output voltage setting.

COMP

Input pin for the gm error amplifier output and the output for the PWM comparator.

Connect phase compensation components to this pin.

See page 22 for how to calculate the resistance and capacitance for phase compensation.

PGND

Ground pin for the output stage of the switching regulator.

Switch pin. This pin is connected to the source of the High Side MOSFET and drain of the

Low Side MOSFET. Connect a bootstrap capacitor of 0.1 µF between this pin and the

BOOT pin. In addition, connect an inductor considering the direct current superimposition

characteristic.

(TOP VIEW)

Figure 2. Pin Configuration

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