Analog Devices Inc./Maxim Integrated MAX8888EZK15+T

Overview

MAX8888EZK15+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output at 1.5V with 100mV dropout at 200mA, featuring an active-low open-drain POK flag and 55µA no-load supply current. It operates from 2.5V–5.5V input and is designed for power management in portable battery-powered systems such as cellular handsets and notebook computers.

For engineers reviewing the MAX8888EZK15+T datasheet, MAX8888EZK15+T pinout, MAX8888EZK15+T application, or MAX8888EZK15+T equivalent, key selection criteria include guaranteed 1.5V output accuracy (±3%), thermal shutdown at 170°C, POK trip threshold at 92.5% of nominal VOUT, and compatibility with 2.2µF ceramic input/output capacitors for stable operation in space-constrained SOT23 layouts.

Technical Context

The MAX8888EZK15+T integrates a p-channel MOSFET pass transistor with 0.5Ω R_DS(ON), enabling low dropout and load-independent quiescent current. Its error amplifier compares feedback from an internal 1.25V reference against a factory-trimmed voltage divider to maintain 1.5V output regulation.

POK functionality relies on a dedicated comparator monitoring VOUT against a 92.5% threshold with 1% hysteresis; the open-drain output requires an external pullup (e.g., 100kΩ to OUT) and asserts low during undervoltage or shutdown. Thermal protection activates at 170°C junction temperature with 20°C hysteresis, cycling the pass transistor under sustained overload.

Key Specifications

Pinout & Package

MAX8888EZK15+T is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P152MR-G and AP2204K-15W5, the MAX8888EZK15+T uniquely combines 100mV dropout, integrated POK, and 55µA quiescent current in a standard SOT23 - making it optimal for space-constrained, battery-powered systems requiring precise power sequencing and extended runtime.

Availability

MAX8888EZK15+T is available at Aetrix Electronics and suitable for cellular handsets, notebook computers, PDAs, and digital cameras requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for MAX8888EZK15+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.

The MAX8888EZK15+T belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable electronics requiring ultra-low quiescent current, tight output accuracy, and integrated power-good monitoring.

FAQ

What is the maximum input voltage rating for the MAX8888EZK15+T?

The MAX8888EZK15+T has an absolute maximum input voltage rating of +7V referenced to GND. However, its operational input range is specified from 2.5V to 5.5V. Exceeding 5.5V may cause functional failure or permanent damage, even if within the absolute maximum limit. The device includes input undervoltage lockout that disables regulation below 2.4V (rising), ensuring clean startup behavior. Always operate the MAX8888EZK15+T within its 2.5V–5.5V functional range for reliable 1.5V output regulation.

Does the MAX8888EZK15+T require external components for stable operation?

Yes, the MAX8888EZK15+T requires two external ceramic capacitors: a 2.2µF capacitor between IN and GND, and another 2.2µF capacitor between OUT and GND. Both must have ESR ≤ 0.1Ω to ensure stability and optimal transient response. The IN capacitor reduces source impedance and improves noise immunity; the OUT capacitor maintains regulation during load steps and enhances PSRR. No BP capacitor is needed for the MAX8888EZK15+T (unlike MAX8887 variants), as it lacks the noise-reduction bypass pin.

How does the POK output function on the MAX8888EZK15+T?

The POK output on the MAX8888EZK15+T is an open-drain, active-low signal that goes low when the regulated 1.5V output falls below 92.5% (1.3875V) of nominal, with 1% hysteresis. During normal operation above threshold, POK floats high-impedance and requires an external pullup resistor - typically 100kΩ connected to OUT. In shutdown or undervoltage, POK is actively driven low. This allows the MAX8888EZK15+T to serve as a precise power-on-reset source for microcontrollers without additional supervision ICs.

What thermal protection features does the MAX8888EZK15+T include?

The MAX8888EZK15+T incorporates thermal shutdown that activates at a junction temperature of +170°C, turning off the pass transistor to prevent damage. After cooling by 20°C (to ~150°C), the device automatically recovers and resumes regulation - resulting in pulsed output under sustained overload. This hysteresis prevents oscillation near the trip point. The device also specifies an absolute maximum junction temperature of +150°C for continuous operation, meaning thermal design must ensure steady-state T_J stays below this limit using appropriate PCB copper area and airflow.

Can the MAX8888EZK15+T be used in automotive applications?

The MAX8888EZK15+T is rated for operation from -40°C to +85°C and is not qualified to AEC-Q100 automotive standards. While its temperature range overlaps with some automotive cabin environments, it lacks automotive-specific validation for reliability, ESD, and lifetime testing. For automotive use, Maxim offers the MAX8888EZK15/V+T variant - denoted by "/V" in the part number - which is explicitly qualified for automotive applications. Do not substitute the MAX8888EZK15+T in safety-critical or engine-bay automotive designs without formal qualification review.