ICL7660S

The ICL7660S is a monolithic CMOS charge‑pump voltage converter IC designed to convert DC voltages from one form to another without inductors — perfect for low‑power supplies, negative rails, and small voltage multiplication tasks.

It’s essentially an improved, lower‑current version of the classic ICL7660 family, with wider operating range and better efficiency.

🧠 Description

Voltage Conversion: Converts a positive supply into negative output (e.g., +5 V → −5 V).

Compact: Requires only two external capacitors for its charge‑pump function.

Boost Pin: Includes a frequency “boost” pin to help lower output impedance when using smaller caps.

Flexible Modes: Can be configured as a voltage doubler, multiplier, or voltage splitter.

Applications: Useful for RS‑232 supplies, ± supplies for data acquisition, negative bias for analog circuits, and general low‑power DC/DC conversion.

📊 Key Specifications
Feature Specification
Part Type Charge Pump DC‑DC Converter
Input Voltage Range 1.5 V to 12 V
Output Voltage −1.5 V to −12 V (inverting)
Voltage Doubler Max Up to 22.8 V with 12 V input (voltage doubler config)
Max Output Current ~45 mA (typical)
Supply Current (Quiescent) ~0.18 mA typical
Oscillator Frequency (typ) 10 kHz – 35 kHz
Package Style 8‑pin (SOIC or PDIP)
Operating Temp Range ~‑40 °C to +85 °C (varies by sub‑part)
RoHS / Pb‑Free Yes (depending on version)