SS30

PS No.A1878-7/7

8. Charge Pump Circuit

The SS30 n-channel DMOS output structure allows it to provide a charge pump based voltage step-up circuit. A

voltage 2 times the VCC voltage can be acquired by inserting capacitors (recommended value: 0.1

μF or larger)

between the CP pin (pin 14) and CPC pin (pin 15). Note that this circuit is designed so that the stepped-up voltage

(VG) is clamped at about 9.5VDC. A larger capacitor must be used between the VG pin (pin 12) and ground if the

ripple on the stepped-up voltage (VG) results in VG exceeding 10V (VG max).

Observe the following points if the VG voltage is supplied from external circuits.

(1) The VG voltage supplied from the external circuits must not exceed the absolute maximum rating VG max.

(2) The capacitors between the CP pin (pin 14) and CPC pin (pin 15) are not required.

(3) Observe the correct sequence when turning the power supply on. Apply the VG voltage after first turning the

VCC voltage on, and cancel the VG voltage application before turning the VCC off.

(4) There is an IC-internal diode between the VCC and VG pins. Therefore, supply voltages such that VCC > VG

must never be applied to this IC.

9. Notes on PCB Pattern Design

The SS30 is a system driver IC implemented using the Bi-CMOS process; the IC chip includes bipolar circuits, MOS

logic circuits, and MOS drive circuits. As a result, extreme care is required with respect to the pattern layout when

designing application circuits.

(1) SGND/SUBGND and VCC/VM wiring layout

Please connect the SGND pin and the SUBGND pin by the beeline. Please connect the VCC pin and the VM pin by

the beeline similarly.

Insert a capacitor (recommended value: 1

μF or larger) as near as possible to the pin between the power pin VCC

(pin 1)/VM (pin 2) and SGND pin (pin 7).

(2) Positioning the external components

The external components that are connected to SGND (pin 7) must be connected with lines that are as short as

possible.

External components connected between IC pins must be placed as near to the pins as possible.

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