Analog Devices Inc./Maxim Integrated MAX1615EUK+T

Overview

The MAX1615EUK+T from Maxim Integrated is a micropower, fixed-output linear regulator in SOT23-5 package, delivering 3.3V or 5V at up to 30mA output current with 4V–28V input range, 8µA max quiescent current, and ±2% initial output accuracy. It powers CMOS RAM and microcontrollers in high-voltage battery systems such as notebook computers and smart-battery packs.

For engineers reviewing the MAX1615EUK+T datasheet, MAX1615EUK+T pinout, MAX1615EUK+T application, or MAX1615EUK+T equivalent, key selection criteria include its low-dropout operation (350mV @30mA), thermal shutdown (150°C), shutdown supply current (<1µA), and pin-selectable output voltage - critical for always-on backup power designs requiring ultra-low static power.

Technical Context

The MAX1615EUK+T implements a PNP pass transistor architecture optimized for high-input-voltage, low-quiescent-current regulation. Its internal resistor divider enables pin-selectable 3.3V/5V outputs via the 5/3 terminal, eliminating external feedback components. The device maintains regulation down to 5µA load and features foldback current limiting with 100mA typical current limit.

It integrates thermal-overload protection with +150°C trip point and +20°C hysteresis, enabling self-recovery under sustained overload. Line-transient response is enhanced by internal compensation and validated with 50mV overshoot on 10mA→20mA load steps using 4.7µF output capacitance.

Key Specifications

Pinout & Package

SOT23-5 package with exposed pad for thermal conduction; 571mW max power dissipation at +70°C ambient; JEDEC-compliant footprint (3.099mm × 1.499mm × 1.3mm height).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-power linear regulator applications.

Compared with TPS76333DBVR and MCP1700-3302E/TO, the MAX1615EUK+T uniquely balances ultra-low 8µA quiescent current, 350mV dropout at 30mA, and pin-selectable 3.3V/5V outputs - making it optimal for space-constrained, long-life backup power where both voltage flexibility and microamp-level leakage matter.

Availability

MAX1615EUK+T is available at Aetrix Electronics and suitable for notebook computer auxiliary rails, smart-battery pack monitoring, and CMOS/RTC backup power applications requiring stable component supply across extended production lifecycles.

Supply support for MAX1615EUK+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 semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.

The MAX1615EUK+T belongs to Maxim's high-voltage micropower linear regulator product line, designed specifically for always-on power delivery in battery-backed systems where ultra-low quiescent current and wide input range are essential.

FAQ

What output voltage does the MAX1615EUK+T deliver, and how is it selected?

The MAX1615EUK+T delivers either 3.3V or 5.0V, selected by the state of the 5/3 pin: connect 5/3 to GND for 3.3V output, or to OUT for 5.0V output. This pin-selectable feature eliminates external feedback resistors. The MAX1615EUK+T is not adjustable - unlike the MAX1616 variant - and its output is factory-trimmed to ±2% initial accuracy across temperature.

What is the maximum continuous output current of the MAX1615EUK+T, and what limits it?

The MAX1615EUK+T supports up to 30mA continuous output current under normal operating conditions. This limit is thermally defined: at +70°C ambient, the SOT23-5 package dissipates up to 571mW (P = I_OUT × (V_IN − V_OUT)). Higher loads require lower input voltage or improved PCB thermal design. The internal current limit is 100mA (typical), but safe continuous operation is capped at 30mA per datasheet specifications.

How does the shutdown function work on the MAX1615EUK+T, and what is its current draw in that mode?

The MAX1615EUK+T enters shutdown when the SHDN pin is pulled low (≤0.25V). In this state, the pass transistor, reference, and bias circuits are disabled, reducing total supply current to <1µA. To enable automatic startup, tie SHDN to IN. The MAX1615EUK+T remains fully specified over −40°C to +85°C in both active and shutdown modes.

Can the MAX1615EUK+T operate with input voltages below 4V, and what happens near dropout?

No - the MAX1615EUK+T requires minimum 4V input for guaranteed operation per Absolute Maximum Ratings and Electrical Characteristics. Below 4V, regulation is not assured. Near dropout (e.g., VIN = 3.65V for 3.3V output), the dropout supply current rises to ~70µA (measured at VIN = 4V), and output accuracy degrades. The device maintains regulation down to 5µA load, but performance parameters like line transient response are only specified above 4V.

What are the recommended input and output capacitors for stable operation of the MAX1615EUK+T?

Use ≥0.1µF ceramic capacitor on IN, placed close to the pin. For OUT, use ≥4.7µF (tantalum or low-ESR ceramic) for full 30mA load; ≥1µF suffices for light loads (<100µA). ESR must be <1Ω. The MAX1615EUK+T is unstable with excessively low-ESR ceramics unless series resistance is added. Layout best practice: minimize trace inductance and maximize GND plane area under the SOT23-5 package.