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 Current package

SOIC-8 8 contacts

Renesas / Intersil · Through-hole E8.3 outline.

Top view. Locate the package index before counting counterclockwise from pin 1.

Bidirectional · Bidirectional

Positive plate of the charge-transfer capacitor.

Renesas / Intersil FN3072 Rev. 7.00, p. 1

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.

The flying capacitor moves charge, and a reservoir capacitor smooths the output. Both its ripple and its voltage drop increase as load increases.

Parameter	Limit	Conditions and source
Input supply1.5–10 V (ICL7660) · 1.5–12 V (ICL7660A)	1.5–10 V (ICL7660) · 1.5–12 V (ICL7660A)	Use the limit for the marked model. 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

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

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.