Analog Devices Inc./Maxim Integrated MAX8877EUK32+T

Overview

MAX8877EUK32+T from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 3.15V output, delivering up to 150mA from 2.5V–6.5V input. It features 30µVRMS output noise, 165mV dropout at 150mA, and 100µA operating supply current - optimized for battery-powered portable electronics requiring stable, clean voltage rails.

For engineers reviewing the MAX8877EUK32+T datasheet, MAX8877EUK32+T pinout, MAX8877EUK32+T application, or MAX8877EUK32+T equivalent, key selection criteria include its SOT23-5 regular package, 10nA shutdown current, ±1.4% output accuracy over temperature, reverse battery protection, and compatibility with industry-standard '2982 footprint.

Technical Context

The MAX8877EUK32+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical R_DS(ON)) to achieve low dropout and eliminate base-drive current loss. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.

Noise reduction is implemented via a dedicated BP pin with external 0.01µF capacitor forming an 80Hz low-pass filter. Thermal shutdown activates at +155°C with 15°C hysteresis, and current limiting caps output at 160mA minimum (390mA typical), enabling indefinite short-circuit survival.

Key Specifications

Pinout & Package

MAX8877EUK32+T is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with GND serving as both electrical return and thermal path. The package measures 2.9mm × 1.6mm × 1.1mm and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX8877EUK32+T, MAX8878EUK32+T adds output discharge without altering noise, dropout, or accuracy - making it a functional superset for new designs needing that feature. MCP1700T-315I/TT trades noise immunity and protection for lower quiescent current and higher output capability, requiring careful evaluation of system-level fault tolerance.

Availability

MAX8877EUK32+T is available at Aetrix Electronics and suitable for hand-held instruments, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for MAX8877EUK32+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.

The MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics requiring ultra-low noise, low dropout, and robust protection - targeting cellular telephones, cordless phones, and handheld computing devices.

FAQ

What is the exact output voltage of MAX8877EUK32+T?

The MAX8877EUK32+T delivers a factory-preset output voltage of 3.15V with ±1.4% accuracy over the full operating temperature range (-40°C to +85°C). This value is confirmed in the Expanded Ordering Information table and Electrical Characteristics section of the datasheet, where "32" corresponds to 3.15V - distinct from standard 3.3V variants like MAX8877EUK33+T.

Does MAX8877EUK32+T include auto-discharge functionality?

No, MAX8877EUK32+T does not include auto-discharge. That feature is exclusive to the MAX8878 variant (e.g., MAX8878EUK32+T), which actively pulls the OUT pin to ground during shutdown. The MAX8877EUK32+T enters ultra-low-current shutdown (10nA) but leaves the output floating or held by external capacitance.

What capacitor values are required for stable operation of MAX8877EUK32+T?

For stable operation, MAX8877EUK32+T requires a minimum 1µF ceramic capacitor (ESR <0.2Ω) on the OUT pin and a 1µF ceramic capacitor on the IN pin. The BP pin must use a 0.01µF ceramic capacitor. For VOUT ≥2.5V (including 3.15V), 1µF is sufficient; larger values improve transient response but are not mandatory for stability.

Is MAX8877EUK32+T pin-compatible with the industry-standard '2982 regulator?

Yes, MAX8877EUK32+T is explicitly designed as pin-compatible with the industry-standard '2982 family. Pin mapping (IN, GND, SHDN, BP, OUT) matches the 5-pin SOT23-5 '2982 footprint, enabling direct replacement without PCB modifications - as stated in the General Description and Pin Configuration sections of the datasheet.

What protection features does MAX8877EUK32+T provide?

MAX8877EUK32+T integrates thermal shutdown (trip at +155°C, 15°C hysteresis), short-circuit protection (160–390mA current limit), and reverse battery protection (limits reverse current to ≤1mA when VIN or SHDN goes below GND). It does not include output discharge or overvoltage protection - those are absent per the Functional Diagram and Detailed Description.