Analog Devices Inc./Maxim Integrated MAX8891EXK15+

Overview

MAX8891EXK15+ from Maxim Integrated is a fixed-output, low-dropout linear regulator with 1.5V output voltage, designed for space-constrained battery-powered systems. It delivers up to 150mA continuous output current with only 120mV dropout at 120mA load, 40µA ground current, and stable operation using 1µF ceramic capacitors - ideal for portable digital cameras and Bluetooth accessories.

For engineers reviewing the MAX8891EXK15+ datasheet, MAX8891EXK15+ pinout, MAX8891EXK15+ application, or MAX8891EXK15+ equivalent, key selection criteria include guaranteed 150mA output capability, SC70-5 package footprint constraints, 65dB PSRR at 10kHz, and shutdown current below 1µA - all critical for low-power, high-stability embedded power rails.

Technical Context

The MAX8891EXK15+ uses an internal p-channel MOSFET pass transistor (R_DS(ON) ≈ 1Ω) to achieve low dropout and eliminate base-drive current loss. Its bandgap reference (1.225V) feeds an error amplifier that controls gate drive to maintain regulation across load and line variations.

It integrates overcurrent protection (200mA limit), thermal shutdown at +160°C with 10°C hysteresis, and logic-level shutdown control (SHDN active-low). Stability is ensured with minimal external components: only 1µF input and 1µF output ceramic capacitors are required - no ESR tuning needed.

Key Specifications

Pinout & Package

MAX8891EXK15+ is housed in a 5-pin SC70 package (2.0mm × 1.25mm, 0.65mm pitch), optimized for ultra-compact PCB layouts. The package features exposed pad for thermal enhancement and is RoHS-compliant (lead-free).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, low-quiescent current LDO applications.

Compared with XC6206P152MR and MIC5205-1.5YM5, the MAX8891EXK15+ offers superior dropout (120mV vs. ≥250mV), lower ground current (40µA vs. ≥1µA/80µA), and integrated protections - making it optimal for high-efficiency, safety-critical portable power rails where SC70 size is acceptable.

Availability

MAX8891EXK15+ is available at Aetrix Electronics and suitable for Bluetooth portable radios, digital cameras, portable stereos, and PDAs requiring stable component supply with guaranteed long-term availability and RoHS compliance.

Supply support for MAX8891EXK15+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX8891/MAX8892 series was designed specifically for ultra-low-power, space-constrained portable electronics - delivering high PSRR, minimal external components, and robust protection in the smallest possible footprint.

FAQ

What is the output voltage tolerance of the MAX8891EXK15+?

The MAX8891EXK15+ has a guaranteed output voltage accuracy of ±3% over temperature (-40°C to +85°C) and load (100µA to 80mA). This specification ensures reliable operation for 1.5V logic interfaces and analog circuits requiring tight voltage regulation without external trimming.

Does the MAX8891EXK15+ require an external feedback resistor network?

No, the MAX8891EXK15+ does not require an external feedback resistor network. It is a factory-preset, fixed-output LDO delivering exactly 1.5V. Unlike the adjustable MAX8892 variant, the MAX8891EXK15+ uses internal resistors and has a no-connect (N.C.) pin at position 4 - simplifying design and reducing BOM count.

What is the minimum input voltage required for regulation with the MAX8891EXK15+?

The minimum input voltage for regulation is determined by dropout: VIN(min) = VOUT + V_DO. At 120mA load, V_DO = 120mV, so VIN must be ≥1.62V. At lighter loads, dropout decreases - e.g., ~50mV at 25mA - enabling operation down to ~1.55V input while maintaining 1.5V output.

Can the MAX8891EXK15+ be used with X5R or Y5V ceramic capacitors?

The MAX8891EXK15+ is stable with 1µF X7R or X5R ceramic capacitors across its full operating temperature range. Y5V dielectrics are not recommended - their capacitance and ESR vary significantly with temperature and bias, potentially compromising stability below -10°C unless ≥2.2µF is used.

Is thermal shutdown recovery automatic on the MAX8891EXK15+?

Yes, thermal shutdown on the MAX8891EXK15+ is fully automatic and self-recovering. When junction temperature exceeds +160°C, the device shuts down; it resumes normal operation once temperature falls by 10°C (to +150°C), producing a pulsed output during sustained overload - protecting the IC without requiring external reset circuitry.