Analog Devices Inc./Maxim Integrated MAX766MJA

Overview

The MAX766MJA from Maxim Integrated is a high-efficiency, low-quiescent-current inverting DC-DC switching regulator delivering a fixed -15V output with up to 250mA load current, operating from 3V to 16V input, and featuring an internal P-channel power MOSFET and current-limited pulse-frequency-modulated (PFM) control. It is designed for battery-powered portable instruments and remote data-acquisition systems requiring stable negative bias under wide temperature extremes.

For engineers reviewing the MAX766MJA datasheet, MAX766MJA pinout, MAX766MJA application, or MAX766MJA equivalent, this page delivers verified electrical parameters, MIL-grade CERDIP package details, confirmed -15V fixed-output behavior, shutdown current ≤5µA, and validated alternatives for ruggedized negative-voltage generation in aerospace and industrial environments.

Technical Context

The MAX766MJA implements a BiCMOS-based, current-limited PFM control scheme that enforces a 16µs maximum on-time and 2.3µs minimum off-time, enabling high efficiency across light-to-heavy loads while maintaining ultra-low no-load supply current (≤120µA). Its internal P-channel MOSFET supports 0.75A peak LX current and operates with a 300kHz switching frequency.

This device powers itself from the differential voltage between V+ and OUT, maximizing gate drive to minimize on-resistance and boost conversion efficiency. The absolute maximum VIN–VOUT differential is +21V, limiting usable output range to –1V to –16V when adjusted, with fixed –15V output specified at ±4% tolerance over –55°C to +125°C.

Key Specifications

Pinout & Package

MAX766MJA is housed in an 8-pin CERDIP (ceramic dual in-line package) with hermetic sealing and gold-plated leads, rated for –55°C to +125°C operation and compatible with MIL-STD-883 screening.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar inverting DC-DC regulator applications.

Compared with MAX766MJA, MAX776MJA offers higher output power but increases component count and layout complexity, while LM2662MM/NOPB eliminates magnetics at the cost of current capability and efficiency-making MAX766MJA the optimal balance for ruggedized 250mA –15V generation.

Availability

MAX766MJA is available at Aetrix Electronics and suitable for LCD-bias generators, portable instruments, LAN adapters, and remote data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX766MJA 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 demanding industrial, automotive, and communications applications.

The MAX764/MAX765/MAX766 family was engineered specifically for high-efficiency, low-I_Q negative-voltage generation in battery-powered and thermally harsh environments-prioritizing quiescent current, wide-input operation, and rugged packaging.

FAQ

What is the fixed output voltage of the MAX766MJA?

The MAX766MJA provides a factory-preset output voltage of –15V with ±4% tolerance over its full operating temperature range (–55°C to +125°C) and input voltage range (3V to 16V). This fixed output is achieved by connecting the FB pin to the REF pin, engaging the internal voltage divider. The MAX766MJA does not support adjustable output without modifying the feedback network, and its –15V specification is distinct from the –5V (MAX764) and –12V (MAX765) variants in the same family.

Does the MAX766MJA require external components to operate at its fixed –15V output?

Yes, the MAX766MJA requires four external components for basic fixed-output operation: a 47µH inductor (L1), a Schottky diode (e.g., 1N5817), an output filter capacitor (e.g., 68µF/20V low-ESR), and an input bypass capacitor (120µF/20V + 0.1µF ceramic). The FB pin must be tied to REF to enable the internal –15V feedback divider; no external resistors are needed for fixed operation. Layout best practices-including star-grounding and short FB/LX traces-are critical for stable performance.

What is the maximum allowable voltage difference between V+ and OUT on the MAX766MJA?

The MAX766MJA has an absolute maximum differential voltage rating of +21V between V+ and OUT pins. Since the device generates a negative output, this means V+ – |VOUT| ≤ 21V. For the fixed –15V output, the maximum permissible V+ is therefore 6V (6V – (–15V) = 21V). At higher input voltages (e.g., 12V or 16V), the output must be adjusted to a less negative value (e.g., –5V or –10V) to remain within the 21V limit. Exceeding this differential risks permanent damage to the internal MOSFET and control circuitry.

How does the shutdown function work on the MAX766MJA?

The MAX766MJA features an active-high TTL/CMOS-compatible SHDN pin (Pin 3). When SHDN is pulled high (≥1.6V), the device enters shutdown mode, reducing total supply current to ≤5µA and discharging the OUT pin to ground via an internal path. During shutdown, the internal reference and bias circuitry are disabled. To resume normal operation, SHDN must be pulled low (≤0.4V), typically by connecting it directly to GND. The transition time to enter or exit shutdown is under 2ms, as verified in the Typical Operating Characteristics graphs.

Is the MAX766MJA pin-compatible with other devices in the MAX764/MAX765/MAX766 family?

Yes, the MAX766MJA shares identical pinout, package footprint (8-pin CERDIP), and functional pin assignments with MAX764MJA and MAX765MJA. All three variants use the same V+, GND, LX, REF, SHDN, FB, and OUT connections. However, output voltage is factory-trimmed per variant: MAX764MJA = –5V, MAX765MJA = –12V, MAX766MJA = –15V. No PCB redesign is required when substituting between these variants, provided the V+–VOUT differential remains within the 21V absolute maximum rating for the chosen output voltage.