S-882Z22-M5T1G datasheet(9/24 Pages) SII

Part #	S-882Z22-M5T1G

Description	ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP

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Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP

Rev.1.2_00

S-882Z Series

Seiko Instruments Inc.

9

2. Step-up DC-DC Converter Output Voltage Monitor Pin (VM Pin)

When the output voltage of the step-up DC-DC converter to be monitored rises and the VM pin voltage (VVM)

reaches or exceeds the shutdown voltage (VOFF), the shutdown state is entered. When this happens, the internal

oscillation circuit stops its operation, so that the charge pump circuit operation stops, and greatly reduces the

power consumption. Figure 13 shows the configuration of the VM pin.

Table 5

VM Pin

Internal Circuit

VVM

< VOFF

Operating

VVM

≥ VOFF

Shutdown

VREF

VM pin

+

−

Figure 13 VM Pin Configuration

Set VVM during shutdown as follows.

VVM

≥ VIN + 1.0 V

VVM

≥ VOUT

When VVM

< VIN + 1.0 V occurs, the shutdown current consumption increases.

When VVM

< VOUT occurs, the discharge control switch leak current increases.

Caution1. When not using the VM pin, be sure to connect it to the VSS pin. If the VM pin is left open, it

may cause malfunctions.

2. Note that the operation to restart a step-up DC-DC converter does not start when CPOUT pin

voltage (VCPOUT) exceeds the discharge stop voltage (VCPOUT2) even if the power-off state is

released. This operation restarts if VCPOUT is lowered than VCPOUT2 by discharge of a start-up

capacitor (CCPOUT).

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S-882Z22-M5T1G Datasheet(PDF) 9 Page - Seiko Instruments Inc

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