R1250V301A Datasheet, PDF (14/14 Pages) RICOH electronics devices division – Negative Output Charge Pump Regulator(100mA)

R1250V××1A
4) Power Consumption
Power Consumption at large load current of this IC can be calculated as follows:
Wchip [mW] ≅ (VIN[V]-| Set Output Voltage |) × (IOUT[mA])
TECHNICAL NOTES
To use this IC, the following things should be considered.
1) Short Protection function for each pin is not included in this IC.
2) Use capacitors with low equivalent series resistor (ESR) for CIN, CP, COUT pins. Capacitors with large ESR make
this IC’s performance worse.
3) Make wiring of GND, VIN, CP+, CP- secure enough and decrease impedance. High impedance could be a cause of
unstable operation of this IC.
4) When this IC is used with large load current, consider its radiation of heat.
5) Basically, Vref pin can be used for soldering to the mount pad of PCB. Do not make it wiring.
6) Load type is electronic or setting between VIN and VOUT, in cases of OFF-state of this IC and start-up state of this
IC, make sure not to raise VOUT level on positive voltage side. If the voltage level is beyond +0.3V, which is desig-
nated as the absolute maximum rating, this IC could be broken.
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