S-882Z Seiko Instruments, S-882Z Datasheet - Page 9

• Manufacturer Part Number: S-882Z
• Description: ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC
• Manufacturer: Seiko Instruments

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Rev.1.2
ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP
2. Step-up DC-DC Converter Output Voltage Monitor Pin (VM Pin)
Caution1. When not using the VM pin, be sure to connect it to the VSS pin. If the VM pin is left open, it
When the output voltage of the step-up DC-DC converter to be monitored rises and the VM pin voltage (V
reaches or exceeds the shutdown voltage (V
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.
Set V
V
V
When V
When V
_00
VM
VM
≥ V
≥ V
VM
VM pin
IN
OUT
VM
VM
2. Note that the operation to restart a step-up DC-DC converter does not start when CPOUT pin
during shutdown as follows.
+ 1.0 V
< V
< V
may cause malfunctions.
Figure 13 VM Pin Configuration
voltage (V
released. This operation restarts if V
capacitor (C
IN
OUT
+ 1.0 V occurs, the shutdown current consumption increases.
occurs, the discharge control switch leak current increases.
CPOUT
CPOUT
) exceeds the discharge stop voltage (V
).
V
REF
Seiko Instruments Inc.
+
−
OFF
), the shutdown state is entered. When this happens, the internal
CPOUT
is lowered than V
V
V
CPOUT2
VM
VM
VM Pin
< V
≥ V
CPOUT2
) even if the power-off state is
OFF
OFF
by discharge of a start-up
Table 5
S-882Z Series
Internal Circuit
Shutdown
Operating
VM
9
)
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