Analog Devices Inc./Maxim Integrated MAX1595EUA33+T

Overview

MAX1595EUA33+T from Maxim Integrated is a regulated 3.3V step-up/step-down charge-pump DC-DC converter supporting 1.8V–5.5V input, delivering up to 75mA output current with ±3% regulation accuracy, 1MHz fixed-frequency switching, and 220µA quiescent current. It serves as a compact auxiliary supply in battery-powered miniature equipment requiring stable 3.3V rail generation without inductors.

For engineers reviewing the MAX1595EUA33+T datasheet, MAX1595EUA33+T pinout, MAX1595EUA33+T application, or MAX1595EUA33+T equivalent, key selection criteria include input voltage range compatibility (1.8V–5.5V), ceramic-capacitor-only implementation (3× external caps), shutdown current (0.1µA), load disconnect during shutdown, and µMAX-8 package thermal limitations (θJA = 206.3°C/W).

Technical Context

The MAX1595EUA33+T implements a dual-mode charge-pump architecture that dynamically switches between boost and buck operation based on input-to-output voltage relationship - stepping up when VIN < VOUT−0.7V and stepping down when VIN > VOUT+0.7V. Its control loop uses a 1.23V bandgap reference and internal resistive feedback to regulate output at precisely 3.3V across load (0–75mA) and temperature (−40°C to +85°C).

It integrates high-current MOSFET switches, soft-start logic (2ms max), undervoltage lockout (1.6V threshold with 40mV hysteresis), and analog power/sense input (AOUT) tied directly to the output capacitor for accurate remote sensing. Shutdown disables all switching and disconnects OUT from IN while drawing only 0.1µA.

Key Specifications

Pinout & Package

MAX1595EUA33+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant, with exposed die pad not electrically connected. Thermal resistance θ_JA = 206.3°C/W limits continuous power dissipation to 387.8mW at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar charge-pump regulator applications.

Compared with MAX1595EUA50+ and TPS60403DBVR, the MAX1595EUA33+T uniquely supports both step-up and step-down conversion from 1.8V–5.5V to a stable 3.3V rail, enabling wider input flexibility and higher 75mA output in the same µMAX-8 footprint - critical for space-constrained battery systems needing dynamic voltage adaptation.

Availability

MAX1595EUA33+T is available at Aetrix Electronics and suitable for white LED backlighting, flash memory supplies, and miniature portable equipment requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.

Supply support for MAX1595EUA33+T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX1595 product line delivers regulated charge-pump DC-DC conversion for space-constrained, battery-powered systems - designed specifically to replace inductor-based solutions with ultra-small, low-noise, and high-efficiency alternatives.

FAQ

What is the maximum continuous output current for MAX1595EUA33+T?

The MAX1595EUA33+T delivers up to 75mA continuous output current at 3.3V while maintaining ±3% regulation across −40°C to +85°C. This limit is thermally constrained by the µMAX-8 package's 387.8mW power dissipation rating at +70°C ambient; exceeding this requires derating or forced cooling. The MAX1595EUA33+T datasheet specifies 75mA as the guaranteed maximum under full temperature and regulation conditions.

Does MAX1595EUA33+T support both step-up and step-down operation?

Yes, the MAX1595EUA33+T automatically operates in boost mode when input voltage is below ~2.6V and in buck mode when input exceeds ~4.0V - maintaining regulated 3.3V output across the full 1.8V–5.5V input range. This dual-mode behavior is intrinsic to its charge-pump topology and requires no external mode selection; the MAX1595EUA33+T handles transitions seamlessly without output disturbance.

What external components are required for basic operation of MAX1595EUA33+T?

The MAX1595EUA33+T requires exactly three external ceramic capacitors: a 1µF input capacitor (C_IN) from IN to GND, a 0.22µF charge-transfer capacitor (C_X) between CXP and CXN, and a 1µF output capacitor (C_OUT) from OUT to GND. No inductor, diodes, or feedback resistors are needed - the MAX1595EUA33+T integrates all regulation circuitry internally.

How does shutdown functionality work on MAX1595EUA33+T?

Driving the SHDN pin low places the MAX1595EUA33+T into shutdown mode, reducing supply current to 0.1µA and physically disconnecting the OUT pin from the IN supply to prevent backfeed. When SHDN is pulled high, the MAX1595EUA33+T initiates a 2ms soft-start sequence that ramps output voltage smoothly to 3.3V, limiting inrush current and avoiding system reset glitches.

Is MAX1595EUA33+T compatible with ceramic output capacitors only?

Yes, the MAX1595EUA33+T is optimized for ceramic output capacitors - specifically 1µF X7R 0805 types - due to their low ESR and stability across temperature. Using electrolytic or tantalum capacitors is not recommended, as their higher ESR increases output ripple beyond specification and may destabilize regulation. The MAX1595EUA33+T datasheet explicitly validates performance with ceramic C_OUT and provides ESR-dependent ripple equations confirming this requirement.