Analog Devices Inc./Maxim Integrated MAX1615EUK+TG24

Overview

MAX1615EUK+TG24 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-designed for keep-alive power in notebook computers and smart-battery packs.

For engineers reviewing the MAX1615EUK+TG24 datasheet, MAX1615EUK+TG24 pinout, MAX1615EUK+TG24 application, or MAX1615EUK+TG24 equivalent, key selection criteria include low-noise operation (5mV_p-p), fast line-transient response under battery-to-adapter switchover, thermal shutdown at +150°C, and pin-selectable output voltage configuration.

Technical Context

The MAX1615EUK+TG24 implements a high-voltage NPN pass transistor architecture with internal resistor divider feedback, enabling stable regulation across wide input voltage swings. It integrates foldback current limiting (100mA typical) and thermal shutdown with +20°C hysteresis, ensuring safe operation during overload or elevated ambient conditions.

Shutdown is activated by pulling SHDN low, reducing supply current to <1µA; automatic start-up occurs when SHDN is tied to IN. The 5/3 pin selects between 3.3V (5/3 = GND) and 5V (5/3 = OUT), eliminating external resistors for fixed-output use cases.

Key Specifications

Pinout & Package

SOT23-5 package with exposed pad thermal path; 5-pin surface-mount footprint measuring 2.9mm × 1.6mm × 1.1mm (JEDEC MO-178AA); rated for 571mW continuous power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Compared with TPS76333DBVR and MCP1700T-3302E/TT, the MAX1615EUK+TG24 uniquely balances ultra-low quiescent current (8µA), low dropout (350mV), and high input voltage tolerance (28V) - making it optimal for battery-swappable systems where both longevity and input flexibility are essential.

Availability

MAX1615EUK+TG24 is available at Aetrix Electronics and suitable for notebook computers, smart-battery packs, and microcontroller keep-alive power applications requiring stable component supply across extended product lifecycles.

Supply support for MAX1615EUK+TG24 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 industrial, computing, and portable applications.

The MAX1615EUK+TG24 belongs to Maxim's high-voltage micropower linear regulator family, engineered specifically for battery-backed systems requiring long-term reliability and minimal standby power consumption.

FAQ

What output voltage does the MAX1615EUK+TG24 deliver?

The MAX1615EUK+TG24 delivers either 3.3V or 5V, selected by connecting the 5/3 pin to GND (3.3V) or to OUT (5V). This pin-selectable feature eliminates external feedback resistors. The MAX1615EUK+TG24 is not adjustable - unlike the MAX1616 variant - and its output is factory-configured only through this hardware pin. Output accuracy is ±2% over temperature and load.

How does the MAX1615EUK+TG24 achieve ultra-low quiescent current?

The MAX1615EUK+TG24 achieves 8µA maximum quiescent current through optimized biasing of its internal reference and error amplifier, combined with a low-leakage NPN pass transistor structure. In shutdown mode (SHDN = GND), supply current drops below 1µA. This design enables multi-year operation on coin cells in CMOS RAM backup applications - a core requirement validated in the MAX1615EUK+TG24 datasheet's operating characteristics.

Can the MAX1615EUK+TG24 operate with a 28V input?

Yes, the MAX1615EUK+TG24 supports input voltages up to 28V continuously, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. It maintains regulation and thermal safety across this full range when used within its power dissipation limits (571mW at +70°C ambient). The device includes internal foldback current limiting and thermal shutdown to protect against overstress at high VIN/VOUT differentials.

What capacitor values are required for stable operation of the MAX1615EUK+TG24?

The MAX1615EUK+TG24 requires a minimum 0.1µF ceramic capacitor on the IN pin and at least 1µF on the OUT pin. For full 30mA load capability, a 4.7µF output capacitor is recommended. The output capacitor's ESR must be less than 1Ω to ensure stability. These values are confirmed in the Applications Information section of the MAX1615EUK+TG24 datasheet and validated in Typical Operating Circuits.

Does the MAX1615EUK+TG24 include thermal protection?

Yes, the MAX1615EUK+TG24 includes thermal-overload protection that activates at +150°C junction temperature, shutting down the pass transistor. After cooling by approximately +20°C, the device automatically resumes regulation - resulting in pulsed output under sustained overload. This behavior is documented in the Detailed Description and Absolute Maximum Ratings sections of the MAX1615EUK+TG24 datasheet.