Figure 2. Pin Configuration
Power supply terminal for the switching regulator.
Connecting 10µF and 0.1µF ceramic capacitors to ground is recommended.
Connect a bootstrap capacitor of 0.1µF between this terminal and SW terminal.
The voltage of this capacitor is the gate drive voltage of the high-side MOSFET.
Switch node. This terminal is connected to the source of the high-side MOSFET and drain of
the low-side MOSFET. Connect a bootstrap capacitor of 0.1µF between this terminal and
BOOT terminal. In addition, connect an inductor considering the direct current
4 GND Ground terminal for the output stage of the switching regulator and the control circuit.
Terminal for setting the soft start time. The rise time of the output voltage can be specified by
connecting a capacitor to this terminal. Refer to page.28 for how to calculate the capacitance.
An inverting input terminal of comparator which compares with reference voltage (VREF).
Refer to page.27 for how to calculate the resistance of the output voltage setting.
Power supply voltage terminal inside IC.
7 VREG Voltage of 5.25V (Typ) is outputted with more than 2.2V is impressed to EN terminal.
Connect 1µF ceramic capacitor to ground.
Turning this terminal signal low level (0.3 V or lower) forces the device to enter the shutdown
8 EN mode. Turning this terminal signal high level (2.2 V or higher) enables the device. This
terminal must be terminated.
A backside heat dissipation pad. Connecting to the internal PCB ground plane by using
multiple via provides excellent heat dissipation characteristics.
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