Analog Devices Inc./Maxim Integrated MAX1616EUK+TG52

Overview

MAX1616EUK+TG52 from Maxim Integrated is an adjustable-output, high-input-voltage linear regulator in SOT23-5 package, delivering 1.24V to 28V at up to 30mA output current with 350mV dropout at 30mA and 8µA max quiescent current. It serves as a keep-alive power source for microcontrollers and RTCs in battery-backed systems such as smart-battery packs and notebook computers.

For engineers reviewing the MAX1616EUK+TG52 datasheet, MAX1616EUK+TG52 pinout, MAX1616EUK+TG52 application, or MAX1616EUK+TG52 equivalent, key selection criteria include its wide 4V–28V input range, FB-pin-based voltage adjustability, thermal shutdown at +150°C, <1µA shutdown current, and SOT23-5 thermal performance (571mW at +70°C).

Technical Context

The MAX1616EUK+TG52 implements a feedback-controlled NPN pass transistor architecture with internal reference (1.24V ±2.5% at FB pin) and precision error amplifier. Its adjustable output is set externally via resistor divider between OUT, FB, and GND - enabling precise regulation across 1.24V–28V while maintaining ±2% initial accuracy over temperature and load.

It integrates foldback current limiting (100mA typical), thermal shutdown with +20°C hysteresis, and active-low SHDN control that reduces supply current to <1µA. The device operates across –40°C to +85°C and tolerates IN-to-GND voltages up to 30V, supporting switchover transients during AC/battery power transitions.

Key Specifications

Pinout & Package

SOT23-5 package with exposed pad (not electrically connected); 571mW power dissipation capability at +70°C ambient; thermal resistance θ_JA = 81°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable linear regulator applications.

Compared with LT1761ES5-3.3#TRMPBF and TPS7A1633DRVR, the MAX1616EUK+TG52 uniquely supports 28V input and delivers true micropower operation (8µA IQ) in a 5-pin SOT23 - making it irreplaceable for high-voltage, long-life backup power designs where adjustability and minimal leakage are mandatory.

Availability

MAX1616EUK+TG52 is available at Aetrix Electronics and suitable for CMOS/RTC backup power, microcontroller keep-alive supply, and notebook computer auxiliary rail applications requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX1616EUK+TG52 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 computing applications.

The MAX1615/MAX1616 product line targets high-input-voltage, ultra-low-power linear regulation - specifically engineered for battery-backed keep-alive functions in portable and embedded systems where input voltage can exceed 20V and standby current must remain below 10µA.

FAQ

What is the maximum input voltage rating for the MAX1616EUK+TG52?

The MAX1616EUK+TG52 has an absolute maximum input voltage of 30V relative to GND, with recommended operating range from 4V to 28V. Exceeding 30V may cause permanent damage. This rating enables direct use with multi-cell Li-ion, LiFePO₄, or lead-acid battery sources without external clamping or pre-regulation - a key requirement for smart-battery and notebook auxiliary rail applications.

How do I set the output voltage of the MAX1616EUK+TG52?

To set the output voltage of the MAX1616EUK+TG52, connect two external resistors (R1 and R2) between OUT, FB, and GND to form a voltage divider. With R2 = 250kΩ (recommended for 5µA minimum load), calculate R1 using R1 = R2 × (V_OUT/1.24V − 1). The FB pin regulates when its voltage equals 1.24V, so V_OUT = 1.24V × (1 + R1/R2). This method enables precise adjustment from 1.24V to 28V.

Does the MAX1616EUK+TG52 require an output capacitor, and what type is recommended?

Yes, the MAX1616EUK+TG52 requires an output capacitor for stability and transient response. Use ≥1µF for light loads, or 6.8µF for full 30mA output (15µF if V_OUT < 3.3V). The capacitor must have ESR < 1Ω - ceramic X7R types (e.g., AVX TPS series) are preferred. Omitting or undersizing the output capacitor risks oscillation, poor load regulation, and excessive output ripple during step-load changes.

What protection features does the MAX1616EUK+TG52 include?

The MAX1616EUK+TG52 integrates foldback current limiting (100mA typical), thermal shutdown at +150°C with +20°C hysteresis, and reverse-output leakage protection. During thermal overload, it cycles on/off to limit average power; during short-circuit, it sustains 30 seconds at GND without damage. These protections eliminate need for external circuitry in battery-powered systems where reliability and component count are critical - directly enhancing robustness of MAX1616EUK+TG52 implementations.

Is the MAX1616EUK+TG52 pin-compatible with the MAX1615EUK+TG52?

No, the MAX1616EUK+TG52 is not pin-compatible with the MAX1615EUK+TG52. While both use SOT23-5 packages and share IN, GND, SHDN, and OUT pins, Pin 3 is labeled "5/3" on the MAX1615 (for 3.3V/5V selection) but functions as FB (feedback input) on the MAX1616EUK+TG52. Swapping them without PCB redesign will result in incorrect regulation or failure to regulate - confirming MAX1616EUK+TG52 requires dedicated layout for its adjustable topology.