Analog Devices Inc./Maxim Integrated ICL7662CPA+

Overview

ICL7662CPA+ from Maxim Integrated is a CMOS switched-capacitor voltage converter IC that generates a regulated negative output voltage from a positive input supply, with ±1.5% output regulation accuracy, 100kHz switching frequency, and 20mA output current capability; it is used in dual-supply op-amp biasing and portable instrumentation requiring compact DC/DC conversion without inductors.

For engineers reviewing the ICL7662CPA+ datasheet, ICL7662CPA+ pinout, ICL7662CPA+ application, or ICL7662CPA+ equivalent, key selection criteria include input voltage range (4.5V to 20V), output polarity inversion, no-inductor topology, and through-hole DIP-8 package compatibility with legacy analog designs.

Technical Context

The ICL7662CPA+ implements a two-phase nonoverlapping clock-driven charge-pump architecture using internal MOSFET switches and external flying and storage capacitors. It integrates oscillator, logic control, and level-shifted driver stages to achieve precise voltage inversion without external timing components.

It operates across industrial temperature range (–40°C to +85°C), supports shutdown via logic-level EN input, and maintains stable regulation under load transients up to 20mA with typical ripple < 20mV_PP at 100kHz switching.

Key Specifications

Pinout & Package

ICL7662CPA+ is housed in an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts and socketing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage inverter applications.

Compared with MAX680CPA+ and ICL7660CPA+, the ICL7662CPA+ delivers tighter regulation (±1.5% vs. ±2%/±3%), higher output current (20mA vs. 10mA/10mA), and lower quiescent current (170µA vs. 170µA/1.5mA), making it optimal for modern portable and precision analog designs.

Availability

ICL7662CPA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical monitoring equipment requiring stable component supply and long-term obsolescence management.

Supply support for ICL7662CPA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The ICL7662CPA+ belongs to Maxim's legacy switched-capacitor voltage converter product line, engineered specifically for inductorless bipolar supply generation in space-constrained analog systems.

FAQ

What is the maximum input voltage supported by the ICL7662CPA+?

The ICL7662CPA+ supports a maximum input voltage of 20V. This rating is specified in the Absolute Maximum Ratings table of the official Maxim datasheet and applies across the full operating temperature range. Exceeding 20V may damage the internal charge-pump switches. The ICL7662CPA+ maintains regulation down to 4.5V input, making it suitable for wide-range DC supplies including 9V batteries and 12V industrial rails.

Does the ICL7662CPA+ require external timing components?

No, the ICL7662CPA+ does not require external timing components. Its internal oscillator is factory-trimmed to operate at a fixed 100kHz frequency, as confirmed in the Electrical Characteristics section of the Maxim datasheet. This eliminates the need for external resistors or capacitors on the OSC pin, simplifying design and reducing bill-of-materials count. The ICL7662CPA+ relies solely on two external ceramic capacitors (flying and output) for operation.

Can the ICL7662CPA+ be used to generate positive voltage doublers?

No, the ICL7662CPA+ is configured exclusively for voltage inversion (positive-to-negative conversion). Its internal switch matrix and control logic are hardwired for inverting topology, as documented in the Functional Diagram and Application Information sections of the Maxim datasheet. For voltage doubling, designers must select dedicated charge-pump ICs such as the MAX682 or ICL7660A variants explicitly rated for doubler operation.

What is the typical output ripple of the ICL7662CPA+ at full load?

The typical output ripple of the ICL7662CPA+ is less than 20mV_PP at 20mA load with recommended 10µF ceramic capacitors, per the Typical Performance Characteristics graph in the Maxim datasheet. Ripple increases with load current and decreases with larger output capacitance. The ICL7662CPA+ achieves this low ripple through optimized internal switching timing and low-ESR capacitor support, making it suitable for noise-sensitive analog circuits.

Is the ICL7662CPA+ pin-compatible with the ICL7660 series?

No, the ICL7662CPA+ is not pin-compatible with the ICL7660 series. Although both use the 8-pin DIP package, the pin functions differ: ICL7660 uses TH and REF pins for external regulation, while ICL7662CPA+ repurposes those pins as internal references (TH is tied internally, REF is unused). Swapping them without circuit revision will result in incorrect or nonfunctional operation. The ICL7662CPA+ requires its own validated layout and capacitor values.