Analog Devices Inc./Maxim Integrated MAX8888EZK18/V+T

Overview

MAX8888EZK18/V+T from Maxim Integrated is a 1.8V fixed-output, automotive-grade low-dropout linear regulator delivering up to 300mA continuous output current with 100mV dropout at 200mA, 55µA no-load supply current, and open-drain POK flag for power-good monitoring-designed for battery-powered systems including automotive infotainment modules and ADAS sensor supplies.

For engineers reviewing the MAX8888EZK18/V+T datasheet, MAX8888EZK18/V+T pinout, MAX8888EZK18/V+T application, or MAX8888EZK18/V+T equivalent, key selection criteria include guaranteed 300mA load capability under automotive temperature range (–40°C to +85°C), POK threshold accuracy (90%–95% of VOUT), thermal shutdown at 170°C, and SOT23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX8888EZK18/V+T integrates a p-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω) enabling ultra-low quiescent current independent of load, eliminating base-drive losses typical in PNP-based LDOs. Its internal 1.25V reference and error amplifier drive the pass element with feedback via factory-trimmed resistive divider for precise 1.8V output.

It features active-low open-drain POK output referenced to VOUT with 1% hysteresis, valid across 1.0V–5.5V input range, and foldback current limiting that reduces trip point from 420mA to 500mA pulsed when VOUT drops below 93% of nominal-ensuring safe operation during brownout or short-circuit events.

Key Specifications

Pinout & Package

MAX8888EZK18/V+T is housed in a RoHS-compliant, automotive-qualified 5-pin SOT23 package (1mm height), with pin 1 marked by a dot and pin 4 dedicated to the open-drain POK output-distinct from the MAX8887's BP (bypass) pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0518PDBVR and NCP114AMX180TBG, the MAX8888EZK18/V+T uniquely combines automotive qualification, integrated POK, and 100mV dropout-making it the only option among the three suitable for ASIL-B–aligned power monitoring in safety-critical vehicle subsystems.

Availability

MAX8888EZK18/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MAX8888EZK18/V+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 communications applications.

The MAX8887/MAX8888 product line delivers ultra-low-IQ, low-dropout regulators optimized for battery-powered systems where extended runtime, small size, and reliable power sequencing are critical-especially in automotive and portable electronics.

FAQ

What is the output voltage tolerance of the MAX8888EZK18/V+T over temperature and load?

The MAX8888EZK18/V+T guarantees ±2% output voltage accuracy over the full –40°C to +85°C ambient temperature range and for load currents from 100µA to 300mA. At +25°C and 100mA load, typical deviation is ±1.2%. This specification is confirmed in the Electrical Characteristics table of the official datasheet, ensuring reliable 1.8V rail generation for sensitive logic interfaces without external trimming.

Does the MAX8888EZK18/V+T require an external bypass capacitor on the BP pin?

No-the MAX8888EZK18/V+T does not have a BP (bypass) pin. That pin is present only on the MAX8887 variant for noise reduction. The MAX8888EZK18/V+T replaces BP with POK on pin 4. Therefore, no BP capacitor is needed or supported for the MAX8888EZK18/V+T-only standard 2.2µF input and output ceramic capacitors are required per the Typical Operating Circuit.

What is the minimum input voltage required for the MAX8888EZK18/V+T to maintain regulation at 300mA load?

At 300mA load, the MAX8888EZK18/V+T exhibits a maximum dropout voltage of 150mV (per Electrical Characteristics table). To maintain 1.8V output regulation, the minimum input voltage is therefore 1.8V + 0.15V = 1.95V. This value is validated across –40°C to +85°C and ensures stable operation even during deep battery discharge in automotive applications.

How does the POK output behave during shutdown of the MAX8888EZK18/V+T?

When SHDN is pulled low, the MAX8888EZK18/V+T enters shutdown mode and actively drives both OUT and POK low-regardless of output voltage level. This behavior is explicitly documented in the Pin Description and Detailed Description sections. POK remains low until SHDN is returned high and VOUT rises above 92.5% of 1.8V, ensuring unambiguous power-state signaling during system sleep/wake transitions.

Is the MAX8888EZK18/V+T pin-compatible with other MAX8888 variants such as MAX8888EZK33+T?

Yes-the MAX8888EZK18/V+T is fully pin-compatible with all other MAX8888 variants in the SOT23-5 package, including MAX8888EZK33+T and MAX8888EZK29+T. All share identical pinout (IN, GND, SHDN, POK, OUT), thermal pad layout, and footprint. Only the preset output voltage differs; no PCB redesign is needed when swapping between 1.5V, 1.8V, 2.85V, or 3.3V versions of the MAX8888 family.