Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Function | Voltage inversion or voltage doubling |
| Inverter input | 1.5 V to 7 V |
| Doubler input | 2.5 V to 7 V |
| Output current | Up to 100 mA |
| Charge-pump frequency | 25 kHz or 120 kHz selectable |
| External capacitors | 10 µF at 25 kHz or 2.2 µF at 120 kHz |
| Package | 8-lead SOIC_N, R-8 |
| Operating temperature | −40°C to +85°C |
Product Overview
ADM660ARZ-REEL7 is a CMOS charge-pump converter that can invert a positive supply to create a negative rail or operate as a voltage doubler. In inverter mode it accepts 1.5 V to 7 V; in doubler mode the input range starts at 2.5 V.
The device uses switched capacitors rather than an inductor. Its frequency-control input selects 25 kHz or 120 kHz operation, allowing a trade between 10 µF and 2.2 µF pump capacitors. Output voltage droops with load because the charge pump has finite output resistance.
Key Features
- Inverting and voltage-doubling modes.
- Up to 100 mA output current.
- Selectable 25 kHz/120 kHz charge-pump frequency.
- 8-lead SOIC_N package for the ARZ variant.
Functional Highlights
The 100 mA specification should not be treated as an ideal regulated-source rating; load current, capacitor ESR, and pump frequency determine output droop and efficiency.
The frequency selection changes the recommended pump-capacitor value: 25 kHz uses 10 µF, while 120 kHz permits 2.2 µF. Low ESR is important.
Application Fit
- Generating a negative op-amp or analog rail from a positive supply.
- Portable and handheld instruments.
- Remote data-acquisition electronics.
- Low-power charge-pump inverter or doubler functions.
Design Considerations
- Choose inversion or doubling first, then verify that mode’s input range.
- Check output droop at the actual load rather than assuming an ideal −VIN or 2×VIN output.
- Use low-ESR pump capacitors of the value appropriate to the selected frequency.
- Do not assign the ADM8660 shutdown function to ADM660.
Related Engineering Resources
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