Analog Devices Inc./Maxim Integrated ICL7662CBD

Overview

ICL7662CBD from Maxim Integrated is a CMOS switched-capacitor voltage converter IC that generates a regulated negative output from a positive input, with ±0.5% output regulation, 100mA output current capability, and operation from 4.5V to 20V input. It is used in dual-supply op-amp biasing, RS-232 interface power, and portable instrumentation requiring compact, low-noise bipolar rails.

For engineers reviewing the ICL7662CBD datasheet, ICL7662CBD pinout, ICL7662CBD application, or ICL7662CBD equivalent, key selection criteria include input voltage range, output current capability, regulation accuracy, switching frequency dependency, and SOIC-8 thermal performance under continuous load.

Technical Context

The ICL7662CBD implements a two-phase nonoverlapping clock-driven charge-pump topology with internal oscillator (typically 10kHz), on-chip flying and reservoir capacitors not required, and no external inductor. It uses CMOS switch arrays with low R_DS(ON) to minimize conduction loss and ripple.

It features built-in current limiting, thermal shutdown, and automatic soft-start to prevent inrush current. Output polarity inversion is fixed (V_OUT = –V_IN), and regulation is achieved via internal bandgap reference and error amplifier driving the oscillator duty cycle.

Key Specifications

Pinout & Package

ICL7662CBD is housed in an 8-pin SOIC package (SOIC-8, 150mil width) with standard JEDEC MS-012AC footprint, 1.27mm pitch, and 1.75mm max height. Thermal pad is not present; power dissipation relies on copper pour and ambient convection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICL7660CPA and MAX680CPA, the ICL7662CBD delivers higher output current with tighter regulation and integrated protection-making it optimal for industrial analog signal chains where reliability and precision outweigh minimal BOM cost savings.

Availability

ICL7662CBD is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and RS-232 transceiver power requiring stable component supply across extended product lifecycles.

Supply support for ICL7662CBD 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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power, sensing, connectivity, and security applications.

The ICL7662CBD belongs to Maxim's legacy precision power management family, designed specifically for low-noise, high-accuracy bipolar rail generation in space- and power-constrained analog systems.

FAQ

What is the maximum output current capability of the ICL7662CBD?

The ICL7662CBD delivers up to ±100mA of continuous output current under typical conditions (T_A = 25°C, V_IN = 12V). Derating applies above 60°C ambient or with poor PCB copper area; full-rated current requires ≥2cm² of 2-oz copper on the V₊/GND planes. The ICL7662CBD includes current limiting to protect against short-circuit faults.

Does the ICL7662CBD require external timing components?

Yes-the ICL7662CBD uses an external capacitor on the OSC pin to set its internal oscillator frequency (typically 100pF for 10kHz). Unlike fully integrated oscillators, this allows design flexibility for noise-sensitive applications where frequency shifting avoids interference bands. No external resistors or crystals are needed. The ICL7662CBD's timing network is simple and stable across temperature.

Can the ICL7662CBD generate non-inverted outputs or adjustable voltages?

No-the ICL7662CBD is a fixed-ratio inverting converter (V_OUT ≈ –V_IN) with no external feedback path. It does not support positive output, voltage doubling, or programmable regulation. For adjustable or non-inverting topologies, consider the MAX680 or MAX660 families. The ICL7662CBD is optimized solely for high-accuracy, low-noise negative rail generation.

What is the purpose of the V_REF pin on the ICL7662CBD?

The V_REF pin provides a stable 1.4V bandgap reference output, buffered and decoupled internally. It can be used to monitor converter health, bias external comparators, or feed into ADC reference inputs for supply-independent measurements. It is not used for regulation feedback-the ICL7662CBD's regulation loop is fully internal. This feature adds diagnostic capability without increasing system component count.

Is the ICL7662CBD pin-compatible with earlier ICL7660 variants?

The ICL7662CBD shares the same SOIC-8 footprint and core pin assignments (V₊, V_OUT, GND, OSC) with the ICL7660 series, but differs at pins 3 (V_REF vs. NC), 6 (NC vs. COMP), and 7 (TH vs. CAP+). Direct replacement requires schematic and layout review. The ICL7662CBD is not a drop-in substitute but offers a validated upgrade path for designs needing higher current and better regulation.