ICL7660 inverting charge pump connection guide

• Positive supply
  • V+ (8)
  • Current-limited 5 V supply
• Ground
  • GND (3)
  • C2 positive
  • Supply return
  • Meter common
• Flying capacitor positive
  • CAP+ (2)
  • C1 positive
• Flying capacitor negative
  • CAP− (4)
  • C1 negative
• Negative output
  • VOUT (5)
  • C2 negative
  • Meter positive

Bench checks

• Check the polarized capacitor orientation. C1 positive goes to CAP+ and C2 positive goes to ground.
• Read VOUT with respect to ground on a high-impedance meter. Expect a negative voltage approaching −5 V without a load.

Renesas / Intersil FN3072 Rev. 7.00, Figure 13 and Do’s And Don’ts.

Measure the output drop under load

• Positive supply
  • V+ (8)
  • Current-limited 5 V supply
• Ground
  • GND (3)
  • C2 positive
  • Supply return
  • Meter common
  • RL.1
• Flying capacitor positive
  • CAP+ (2)
  • C1 positive
• Flying capacitor negative
  • CAP− (4)
  • C1 negative
• Negative output
  • VOUT (5)
  • C2 negative
  • Meter positive
  • RL.2

Bench checks

• Expect a nominal load of about 0.5 mA. Compare the loaded voltage and ripple against the unloaded reading.

Renesas / Intersil FN3072 Rev. 7.00, Figures 13–14. The load is a fixture choice.

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

The original ICL7660 and ICL7660A share the same contact functions. The ICL7660S has a frequency boost pin where this map shows NC.

ICL7660CPA

1.5 to 10 V operating supply, 0 to 70 °C.

ICL7660CPAZ

1.5 to 10 V operating supply, 0 to 70 °C.

ICL7660ACPA

1.5 to 12 V operating supply, 0 to 70 °C.

ICL7660ACPAZ

1.5 to 12 V operating supply, 0 to 70 °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.