Inverting supply
The flying capacitor moves charge, and a reservoir capacitor smooths the output. Both its ripple and its voltage drop increase as load increases.
ICL7660 inverting charge pump pinout
The ICL7660 transfers charge through a flying capacitor to create a small negative supply from a positive rail.
PDIP-8 8 contacts
SOIC-8
8 contacts Current package1.5 to 10 V operating supply, 0 to 70 °C.
SOIC-8 pinout
1 · NC
Leave open. The ICL7660S has a different function at this position.
All 8 pins
| Pin | Signal | Direction | Function |
|---|---|---|---|
| 1 | NC No connection | No connection | Leave open. The ICL7660S has a different function at this position. |
| 2 | CAP+ Bidirectional | Bidirectional | Positive plate of the charge-transfer capacitor. |
| 3 | GND Return | Return | Input and output reference. Positive plate of the output reservoir capacitor. |
| 4 | CAP− Bidirectional | Bidirectional | Negative plate of the charge-transfer capacitor. |
| 5 | VOUT Output | Output | Negative output. Its unloaded magnitude approaches the input voltage. |
| 6 | LV Input | Input | Ground for low-voltage operation below 3.5 V. Leave open above 3.5 V. |
| 7 | OSC Oscillator node | Oscillator node | Leave open to use the internal oscillator unmodified. |
| 8 | V+ Supply | Supply | Positive input supply. |
Signal assignments
Electrical limits
| Parameter | Limit | Conditions and source |
|---|---|---|
| Input supply1.5–10 V | 1.5–10 V | Ground LV below 3.5 V. Leave LV open above 3.5 V. Renesas / Intersil FN3072 Rev. 7.00, electrical specifications |
| Oscillator frequency10 kHz typical | 10 kHz typical | Unloaded oscillator at V+ = 5 V with OSC open. Renesas / Intersil FN3072 Rev. 7.00 |
| Ideal unloaded output−V+ | −V+ | Losses and output impedance reduce the magnitude under load. Renesas / Intersil FN3072 Rev. 7.00, Figure 13 |
Models and documents
The original ICL7660 and ICL7660A share the same contact functions. The ICL7660S has a frequency boost pin where this map shows NC.
- ICL7660CBA
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660CBA-T
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660CBAZ
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660CBAZ-T
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660CBAZA
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660CBAZA-T
- 1.5 to 10 V operating supply, 0 to 70 °C.
- ICL7660ACBA
- 1.5 to 12 V operating supply, 0 to 70 °C.
- ICL7660ACBA-T
- 1.5 to 12 V operating supply, 0 to 70 °C.
- ICL7660ACBAZA
- 1.5 to 12 V operating supply, 0 to 70 °C.
- ICL7660ACBAZA-T
- 1.5 to 12 V operating supply, 0 to 70 °C.
- ICL7660AIBA
- 1.5 to 12 V operating supply, −40 to +85 °C.
- ICL7660AIBA-T
- 1.5 to 12 V operating supply, −40 to +85 °C.
- ICL7660AIBAZA
- 1.5 to 12 V operating supply, −40 to +85 °C.
- ICL7660AIBAZA-T
- 1.5 to 12 V operating supply, −40 to +85 °C.
- Renesas / Intersil FN3072 Rev. 7.00· Ordering guide, pin map and simple negative converter.
- Source register· Document revisions, applicable order codes, consulted sections and available file checksums.