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SP312AEP Datasheet(PDF) 7 Page - Sipex Corporation |
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SP312AEP Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 16 page  7 Jan 3-07 Rev B SP232A/233A/30A/32A © 2007 Sipex Corporation Figure 6. Charge Pump Waveforms VDD a) C 2 + GND GND b) C 2 – Vss Figure 7. Charge Pump — Phase 3 VCC= +5V –5V +5V –5V VSSStorage Capacitor VDDStorage Capacitor C1 C2 C3 C4 + + + + – – – – Figure 8. Charge Pump — Phase 4 that generate V– from V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at greater than 15kHz. The external capacitors can be as low as 0.1µF with a 10V breakdown voltage rating. Shutdown (SD) and Enable (EN) for the SP310A and SP312A Both the SP310A and SP312A have a shutdown/ standby mode to conserve power in battery-pow- ered systems. To activate the shutdown mode, which stops the operation of the charge pump, a logic “0” is applied to the appropriate control line. For the SP310A, this control line is ON/OFF (pin 18). Activating the shutdown mode also puts the Vcc = +5V VDD VSSStorage Capacitor VDDStorage Capacitor C1 C2 C3 C4 + + + + – – – – |
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