Analog Devices Inc./Maxim Integrated MAX607EUA

Overview

The MAX607EUA from Maxim Integrated is a low-profile, current-mode, step-up DC-DC converter optimized for PCMCIA and flash memory card power supplies. It operates from 3V to 5.5V input, delivers up to 90mA at 12V (or 180mA at 5V), features ±4% output regulation, 500kHz switching frequency, and 1µA logic-controlled shutdown - enabling compact, height-constrained designs such as Type 2/3 PC cards and handheld equipment.

For engineers reviewing the MAX607EUA datasheet, MAX607EUA pinout, MAX607EUA application, or MAX607EUA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application constraints (e.g., inductor selection, soft-start timing), and two rigorously cross-checked alternative parts with documented functional and application-level differences.

Technical Context

The MAX607EUA implements a proprietary pulse-frequency-modulation (PFM) control scheme with variable on-time (t_ON = K/V_IN, K = 6 µs·V typical) and off-time (t_OFF = 0.5·K/(V_OUT + V_DIODE − V_IN)), enabling high efficiency across wide input/output voltage ranges while maintaining ±4% output accuracy. Its internal 1Ω n-channel power MOSFET switch supports peak currents up to 1.25A and operates in continuous-conduction mode with appropriate inductor selection.

It integrates undervoltage lockout (2.8V threshold), user-configurable output via FB pin (5V when tied to IN, 12V when tied to GND, or adjustable from V_IN to 12.5V), and soft-start controlled by external capacitor on SS pin - all within an 8-pin µMAX package measuring just 3.05mm × 3.05mm × 1.11mm max height.

Key Specifications

Pinout & Package

MAX607EUA uses the 8-pin µMAX package (3.05mm × 3.05mm, 1.11mm max height), pin-compatible with SO-8 but occupying ~50% less board area and half the height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up DC-DC converter applications.

Compared with MAX606EUA and TPS61040DRVR, the MAX607EUA uniquely balances height-constrained packaging, dual preset outputs (5V/12V), and adjustable range - making it the only option qualified for Type 2/3 PCMCIA cards requiring field-selectable programming voltages without layout redesign.

Availability

MAX607EUA is available at Aetrix Electronics and suitable for PCMCIA card design, flash memory programming systems, and handheld medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed µMAX package availability.

Supply support for MAX607EUA 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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for space-, power-, and size-constrained applications.

The MAX606/MAX607 product line was designed specifically for ultra-thin portable computing peripherals - delivering regulated boost conversion in the smallest possible footprint for PCMCIA, memory cards, and handheld devices.

FAQ

What output voltages does the MAX607EUA support, and how are they selected?

The MAX607EUA supports three output configurations: 5V (FB pin tied to IN), 12V (FB pin tied to GND), or adjustable (FB pin connected to resistive divider between OUT and GND). The adjustable range spans V_IN to 12.5V, calculated using V_OUT = 2.00V × (R1/R2 + 1). This pin-strapping method eliminates external DACs or digital interfaces, simplifying design for MAX607EUA-based PCMCIA and flash programming supplies.

How does the MAX607EUA achieve low profile in PCMCIA applications?

The MAX607EUA achieves its low profile through a combination of 500kHz switching (enabling use of a compact 10µH inductor), the 1.11mm-max-height 8-pin µMAX package, and integration of the power MOSFET, error amplifier, and timing circuitry. When paired with 0.68µF ceramic output capacitors and a Schottky diode, the entire circuit fits within the 2.5mm height limit of Type 2/3 PCMCIA cards - a key requirement validated in MAX607EUA reference designs.

What is the purpose of the SS (Soft-Start) pin on the MAX607EUA, and how is it implemented?

The SS pin on the MAX607EUA controls inrush current during power-up or wake-from-shutdown by gradually increasing the internal current-limit threshold. It is pulled up internally with a 45kΩ resistor to a 2V reference; an external capacitor sets the ramp time. For example, a 10nF capacitor yields ~1.2ms startup delay. This feature protects weak supplies (e.g., aging batteries) and prevents output overshoot - critical in MAX607EUA flash programming applications where stable VPP ramping ensures reliable cell writes.

Can the MAX607EUA operate from a 3.0V input and still deliver 12V output?

Yes, the MAX607EUA is fully specified to operate from 3.0V to 5.5V input and deliver regulated 12V output. At 3.0V input, it provides up to 90mA into a 12V load with ±4% accuracy, as confirmed in the Electrical Characteristics table (V_IN = 3V, V_OUT = 12V, I_LOAD = 0–90mA). This capability is essential for MAX607EUA deployment in single-cell Li-ion powered devices where input voltage drops near end-of-discharge.

What is the shutdown current of the MAX607EUA, and how is shutdown activated?

The MAX607EUA draws 10µA typical quiescent current in shutdown mode, achieved by pulling the SHDN pin low (≤0.25×V_IN). During shutdown, the internal reference and power switch are disabled, and the SS capacitor is actively discharged. This ultra-low shutdown current extends battery life in MAX607EUA-based portable instruments and memory programmers that spend extended periods in standby.