S-882Z Seiko Instruments, S-882Z Datasheet - Page 14

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

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14
ULTRA-LOW VOLTAGE OPERATION CHARGE PUMP IC FOR STEP-UP DC-DC CONVERTER STARTUP
S-882Z Series
Precautions
• If the consumption current (I
• If the discharge start voltage (V
• Select a capacitor with a sufficiently large capacitance for the startup capacitor. In the case of a capacitor with
• The discharge start delay time (t
• When stopping the discharge to OUT pin and recharging a startup capacitor (C
• Note that the operation to restart a step-up DC-DC converter does not start when CPOUT pin voltage (V
• When designing for mass production using an application circuit described herein, the product deviation and
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
so that conditions (1) and (2) below are satisfied.
to be started, the step-up DC-DC converter may not start up. When selecting products, fully check them using an
actually mounted model. (Refer to
insufficient capacitance, the step-up DC-DC converter may not start up. When selecting products, fully check them
using an actually mounted model. (Refer to
longer when these conditions are combined.
charged until CPOUT pin voltage (V
the condition as follows:
exceeds the discharge stop voltage (V
V
temperature characteristics should be taken into consideration. SII shall not bear any responsibility for the products
on the circuits described herein.
protection circuit.
including this IC of patents owned by a third party.
CPOUT
(1) The operating input voltage (V
(2) The discharge start voltage (V
(3) The startup capacitor value (C
Condition: OUT pin voltage (V
(1) V
(2) V
is lowered than V
VM
IN
+ 1.0 V ≤ V
≥ V
OFF
VM
CPOUT2
≤ 3.0 V
SSS
by discharge of a start-up capacitor (C
) during shutdown needs to be kept at 0.8 µA or lower, set the VM pin voltage (V
CPOUT1
OUT
OUT
) is longer according to conditions (1), (2), and (3) below. Also note it is further
CPOUT
)< Discharge stop voltage (V
Selection of Product and Startup Capacitor (C
CPOUT1
IN
CPOUT
) of this IC is lower than the operating voltage of the step-up DC-DC converter
) is low.
CPOUT2
) is lowered less than discharge stop voltage (V
Seiko Instruments Inc.
) is large.
) is high.
Selection of Product and Startup Capacitor (C
) even if the power-off state is released. This operation restarts if
CPOUT2
CPOUT
)
).
CPOUT
CPOUT
), C
CPOUT2
) .)
CPOUT
CPOUT
). In this case, set
is needed to be
) .)
Rev.1.2
CPOUT
_00
VM
)
)
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