Analog Devices Inc./Maxim Integrated MAX727CCK

Overview

MAX727CCK from Maxim Integrated is a monolithic, bipolar, PWM switch-mode step-down DC-DC regulator with fixed 5V output, 2A on-chip power switch, 100kHz switching frequency, and 8V–40V input range. It implements classic buck topology for high-current voltage conversion in industrial power supplies and distributed bus systems.

For engineers reviewing the MAX727CCK datasheet, MAX727CCK pinout, MAX727CCK application, or MAX727CCK equivalent, key selection criteria include its fixed 5V output, TO-220 package thermal performance, cycle-by-cycle current limiting, and compatibility with standard buck converter layouts using external inductor and diode.

Technical Context

The MAX727CCK integrates oscillator, error amplifier, feedback network, and 2A bipolar power switch in a single die. Its fixed 100kHz PWM control operates with cycle-by-cycle current limiting and internal reference tied to GND, requiring direct SENSE-to-VOUT connection for regulation.

It uses a classic buck topology with VIN connected to switch collector and VSW as emitter output, enabling operation down to 8V start-up voltage and supporting up to 45V absolute max input. The VC pin provides error-amplifier output with ±0.7V to +5.8V swing and supports external TTL clock synchronization between 115kHz–170kHz.

Key Specifications

Pinout & Package

MAX727CCK is housed in a 5-pin TO-220 package with case electrically connected to GND. Standard configuration uses staggered leads; straight-lead variant available on request.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with MAX727ECK and LM2596T-5.0, the MAX727CCK offers optimal balance of 2A output, fixed 5V regulation, and commercial-temperature suitability - making it ideal for cost-constrained, volume industrial power supplies where ambient stays ≤70°C and full 2A capability is essential.

Availability

MAX727CCK is available at Aetrix Electronics and suitable for industrial power supplies, distributed bus converters, and legacy equipment replacements requiring stable component supply and known thermal derating behavior.

Supply support for MAX727CCK 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, communications, and computing applications.

The MAX727CCK belongs to the MAX72x family of monolithic buck regulators targeting high-current, fixed-output DC-DC conversion in space-constrained industrial systems where simplicity and reliability outweigh programmability needs.

FAQ

What is the maximum input voltage rating for the MAX727CCK?

The MAX727CCK has an absolute maximum input voltage rating of 45V. Operation above 40V violates the recommended operating conditions and risks permanent damage. For reliable long-term use, keep VIN within 8V–40V per the datasheet specifications. The MAX727CCK is designed for industrial bus applications where 24V or 36V inputs are common, and its 40V upper limit accommodates transients without external clamping in most cases.

Does the MAX727CCK require external feedback resistors to set output voltage?

No, the MAX727CCK does not require external feedback resistors. It features a factory-trimmed internal reference and fixed 5V output circuitry. The SENSE pin must be connected directly to the output node to close the regulation loop. This eliminates resistor tolerance errors and drift, ensuring ±2% output accuracy across temperature and line/load conditions - a key advantage over adjustable regulators like the MAX724 series.

Can the MAX727CCK be synchronized to an external clock?

Yes, the MAX727CCK supports external clock synchronization via the VC pin. When driven with a TTL-level square wave between 115kHz and 170kHz, the internal oscillator locks to the external frequency. This capability allows phase alignment with other switching regulators in multi-rail systems to reduce input ripple and EMI peaks. Note that the MAX727CCK's nominal 100kHz free-running frequency falls outside this sync range, so synchronization requires an external source meeting those exact specifications.

What thermal considerations apply to the MAX727CCK in continuous 2A operation?

In continuous 2A operation at full load and 40V input, the MAX727CCK dissipates approximately 5W. With its 4.0°C/W junction-to-case thermal resistance, a properly mounted heatsink maintaining case temperature ≤70°C ensures junction stays within the 125°C limit. Derating is required above +70°C ambient; the MAX727CCK's 0°C to +70°C commercial temperature grade means operation beyond this range requires thermal modeling or substitution with the MAX727ECK.

Is the MAX727CCK still recommended for new designs?

No, the MAX727CCK is Not Recommended for New Designs. Maxim discontinued the wafer process used to manufacture it, and no second-source or drop-in replacement is officially designated. While Aetrix Electronics maintains limited inventory for legacy support, new designs should evaluate modern alternatives such as the MAX2000x or ADI's LT86xx families - which offer improved efficiency, smaller packages, and active lifecycle support. The MAX727CCK remains viable only for repair, maintenance, or short-run production of existing hardware.