Analog Devices Inc./Maxim Integrated MAX1963ETT250+T

Overview

MAX1963ETT250+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output current with ±0.5% output voltage accuracy at 2.50V, 100mV dropout at full load, and active-low open-drain RESET output with 2.2ms delay. It operates from 1.62V to 3.6V input and is designed for power management in space-constrained portable electronics such as cellular handsets and digital cameras.

For engineers reviewing the MAX1963ETT250+T datasheet, MAX1963ETT250+T pinout, MAX1963ETT250+T application, or MAX1963ETT250+T equivalent, key selection criteria include guaranteed 300mA load capability under low-input-voltage conditions (≥1.62V), tight output accuracy across temperature and load, integrated reset timing, and thermal/short-circuit protection in a 3mm × 3mm TDFN package.

Technical Context

The MAX1963ETT250+T uses an internal P-channel MOSFET pass transistor (R_DS(ON) = 0.33Ω) enabling supply current independence from load and dropout voltage - critical for battery life in portable systems. Its error amplifier compares a trimmed bandgap reference against feedback from the internal voltage divider to regulate the 2.50V output.

RESET functionality monitors V_OUT with 82.5% threshold hysteresis and asserts active-low for ≥2.2ms after regulation is achieved; it deasserts immediately upon V_OUT falling below threshold or during shutdown. Thermal shutdown activates at +165°C with 15°C hysteresis, and current limiting triggers at ≥450mA.

Key Specifications

Pinout & Package

MAX1963ETT250+T is housed in a 6-pin 3mm × 3mm thin DFN (TDFN) package with exposed pad (EP) for thermal dissipation. The package height is <0.8mm, suitable for ultra-thin portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B252MR-G and ADP160AUJZ-2.5-R7, the MAX1963ETT250+T uniquely delivers 300mA at 100mV dropout with integrated 2.2ms RESET in a 3mm × 3mm footprint - making it the only option supporting full-current operation across wide input ranges while meeting microprocessor reset timing.

Availability

MAX1963ETT250+T is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and digital cameras requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed long-term availability.

Supply support for MAX1963ETT250+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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX1963 series belongs to Maxim's low-input-voltage LDO family, engineered specifically for battery-powered portable equipment where minimal dropout, tight accuracy, and integrated supervisory functions are essential.

FAQ

What is the output voltage tolerance of the MAX1963ETT250+T over temperature and load?

The MAX1963ETT250+T guarantees ±0.5% output voltage accuracy across –40°C to +85°C, 1mA to 300mA load, and 1.8V to 3.6V input. This is achieved via factory-trimmed internal feedback, eliminating need for external resistors and ensuring consistent 2.50V regulation in portable systems where thermal and load variation is common. The MAX1963ETT250+T maintains this spec without derating.

Does the MAX1963ETT250+T require external capacitors, and what values are recommended?

Yes - the MAX1963ETT250+T requires a 1µF ceramic capacitor between IN and GND, and a 4.7µF low-ESR ceramic capacitor between OUT and GND. These values ensure stability across temperature and load, minimize noise, and optimize transient response. Using capacitors outside these recommendations may cause oscillation or degraded PSRR, especially under 300mA load steps. The MAX1963ETT250+T datasheet specifies ESR ≤30mΩ for the output capacitor.

How does the RESET output of the MAX1963ETT250+T behave during power-up and brownout?

The MAX1963ETT250+T RESET output is open-drain and active-low. It asserts (goes low) when V_OUT falls below 82.5% of nominal (2.06V for 2.50V output) and remains asserted for ≥2.2ms after V_OUT rises above that threshold. During brownout or shutdown, RESET falls immediately. This behavior ensures reliable microprocessor reset signaling in both power-up and fault conditions. The MAX1963ETT250+T RESET pin requires an external pull-up resistor to function correctly.

Can the MAX1963ETT250+T operate from a single-cell Li-ion battery throughout its discharge curve?

Yes - the MAX1963ETT250+T supports input voltages from 1.62V to 3.6V and delivers 2.50V output with only 100mV dropout at 300mA. This allows operation down to ~2.60V input, covering most of a single-cell Li-ion's usable range (2.7V–4.2V). Its 1.62V minimum input also supports LiFePO₄ (2.0–3.6V) and dual-alkaline (2.4–3.2V) sources. The MAX1963ETT250+T includes undervoltage lockout (1.30–1.60V) to prevent erratic behavior near cutoff.

What thermal performance can be expected from the MAX1963ETT250+T in a 3mm × 3mm TDFN package?

In the 3mm × 3mm TDFN package with exposed pad (T633+2), the MAX1963ETT250+T achieves 1951mW maximum power dissipation at +70°C ambient. With proper PCB copper area connected to the EP, it sustains 300mA output even at 2V input-output differential. Thermal shutdown activates at +165°C junction temperature with 15°C hysteresis, enabling pulsed recovery during overload. The MAX1963ETT250+T thermal design requires ≥100mm² of 1oz copper tied to EP for optimal performance.