Analog Devices Inc./Maxim Integrated MAX8891EXK33/V+T

Overview

MAX8891EXK33/V+T from Maxim Integrated is a high-PSRR, low-dropout linear regulator preset to 3.3V output, delivering up to 150mA with 120mV dropout at 120mA load, 40µA ground current, and stable operation using only 1µF ceramic input/output capacitors. It serves as a primary power rail for battery-powered RF and digital subsystems in portable wireless devices.

For engineers reviewing the MAX8891EXK33/V+T datasheet, MAX8891EXK33/V+T pinout, MAX8891EXK33/V+T application, or MAX8891EXK33/V+T equivalent, key selection criteria include automotive-grade temperature range (-40°C to +85°C), SC70-5 package footprint constraints, 65dB PSRR at 10kHz, and shutdown current <1µA - all critical for space-constrained, low-power, AEC-Q200-aligned designs.

Technical Context

The MAX8891EXK33/V+T uses an internal p-channel MOSFET pass transistor (R_DS(ON) ≈ 1Ω) enabling ultra-low quiescent current and minimal dropout voltage across its 2V–6V input range. Its bandgap reference (1.225V) feeds an error amplifier that controls gate drive without base-current overhead, distinguishing it from PNP-based LDOs.

It integrates thermal shutdown (160°C trip, 10°C hysteresis), current limiting (200mA), and logic-controlled shutdown (SHDN pin with 0.4V logic-low threshold). The /V suffix confirms AEC-Q200 qualification, supporting automotive infotainment and telematics modules requiring extended temperature reliability.

Key Specifications

Pinout & Package

MAX8891EXK33/V+T is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.95mm height), optimized for high-density portable PCBs. The package features exposed pad for thermal conduction and requires standard reflow profile (peak 260°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P332MR-G and ADP160AUJZ-3.3-R7, the MAX8891EXK33/V+T uniquely combines automotive qualification, lowest dropout (120mV), highest PSRR (65dB), and guaranteed 150mA output in SC70 - making it optimal for safety-critical, noise-sensitive, and battery-endurance-driven applications.

Availability

MAX8891EXK33/V+T is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical sensors, and industrial handheld terminals requiring stable component supply with AEC-Q200 compliance, small-footprint power regulation, and low-noise 3.3V generation.

Supply support for MAX8891EXK33/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 MAX8891 series targets space-constrained, battery-powered systems requiring high PSRR, ultra-low quiescent current, and guaranteed performance across automotive temperature ranges - especially in RF, sensor, and display subsystems.

FAQ

What is the maximum input voltage rating for MAX8891EXK33/V+T?

The MAX8891EXK33/V+T has an absolute maximum input voltage of +7V relative to GND. Its recommended operating input range is 2V to 6V. Exceeding 6V may degrade long-term reliability even if within absolute max ratings, and operation below 2V prevents regulation due to dropout constraints. Always maintain ≥120mV headroom above 3.3V output for stable regulation at full load.

Does MAX8891EXK33/V+T require an external feedback resistor network?

No, the MAX8891EXK33/V+T does not require an external feedback resistor network. It is a fixed-output variant with factory-trimmed 3.3V regulation achieved via internal resistor divider. Only the MAX8892 version supports adjustable output using external FB resistors. This simplifies design, reduces BOM count, and improves accuracy versus discrete resistor tolerances.

Is MAX8891EXK33/V+T compatible with X7R ceramic capacitors?

Yes, MAX8891EXK33/V+T is fully compatible with X7R ceramic capacitors. The datasheet explicitly states that 1µF X7R or X5R dielectric capacitors ensure stability across the full -40°C to +85°C operating range. Z5U or Y5V types are discouraged below -10°C due to capacitance drift, but X7R guarantees consistent 1µF value and low ESR for reliable startup and transient response.

What thermal protection behavior does MAX8891EXK33/V+T exhibit under overload?

Under sustained overload, MAX8891EXK33/V+T activates thermal shutdown at 160°C junction temperature, turning off the output. After cooling by 10°C (to ~150°C), it automatically resumes regulation - resulting in pulsed output during continuous fault conditions. This protects the device without requiring external reset circuitry and is validated per AEC-Q200 thermal stress requirements.

How does the /V suffix in MAX8891EXK33/V+T affect its specifications?

The /V suffix in MAX8891EXK33/V+T denotes AEC-Q200 qualification, confirming full testing and screening for automotive-grade reliability including temperature cycling, humidity bias, mechanical shock, and lifetime validation across -40°C to +85°C. Electrical specifications remain identical to non-/V versions, but the /V part undergoes additional process controls and lot-level automotive traceability.