Analog Devices Inc./Maxim Integrated MAX4914BELT+T

Overview

MAX4914BELT+T from Maxim Integrated is a latchoff-mode current-limit switch designed for SDIO and USB load switching in portable electronics. It features 100mA guaranteed forward current limit, 0.2Ω on-resistance, 14ms fault-blanking time, and operates from 2.3V to 5.5V. Its primary role is protecting host devices from overcurrent faults during hot-swap of capacitive loads.

For engineers reviewing the MAX4914BELT+T datasheet, MAX4914BELT+T pinout, MAX4914BELT+T application, or MAX4914BELT+T equivalent, key selection criteria include latchoff behavior (vs. autoretry), 100mA current-limit threshold, μDFN-6 package footprint, thermal shutdown at +150°C, and reverse current protection up to 150mA.

Technical Context

The MAX4914BELT+T implements a fixed 100mA forward current limit using internal sense-resistor comparison against dual reference voltages. Upon sustained overcurrent exceeding 14ms blanking time, it enters latchoff - disconnecting IN from OUT and asserting open-drain FLAG low until ON is cycled or VIN drops below UVLO (2.25V max).

It integrates undervoltage lockout (1.75V–2.25V hysteresis), reverse current limiting (150mA min), thermal shutdown (+150°C with 15°C hysteresis), and ultra-low shutdown current (0.01μA typ). No autoretry logic is present - distinguishing it from MAX4915A/MAX4917A variants.

Key Specifications

Pinout & Package

The MAX4914BELT+T is housed in a 6-pin μDFN package (2mm × 2mm, 0.5mm pitch) with wettable flanks, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limit switch applications.

Compared with MAX4914BELT+T, MAX4915BELT+T and MAX4917BELT+T retain identical latchoff control, thermal shutdown, and pinout - enabling direct BOM upgrades where higher current headroom is needed without modifying PCB layout or firmware fault-handling logic.

Availability

MAX4914BELT+T is available at Aetrix Electronics and suitable for SDIO interface protection, USB OTG power gating, and portable medical sensor hub designs requiring stable component supply across extended temperature ranges (-40°C to +85°C).

Supply support for MAX4914BELT+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 semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.

The MAX4914B/MAX4915A/B/MAX4917A/B family was engineered specifically for robust, low-footprint load switching in battery-powered portable electronics - emphasizing latchoff reliability, reverse current blocking, and minimal quiescent consumption.

FAQ

What is the guaranteed forward current limit of the MAX4914BELT+T?

The MAX4914BELT+T guarantees a minimum forward current limit of 100mA. This value is tested and specified across the full operating temperature range (-40°C to +85°C) and ensures consistent overcurrent protection regardless of ambient conditions or supply voltage within 2.3V–5.5V. The actual trip point is typically 150mA, providing margin above the guaranteed minimum.

Does the MAX4914BELT+T support autoretry functionality?

No, the MAX4914BELT+T does not support autoretry. It belongs to the latchoff variant group (denoted by "B" suffix), meaning it remains off after a current-limit fault until the ON pin is actively cycled low-to-high or the input supply voltage drops below the undervoltage lockout threshold (~2.25V). Autoretry is exclusive to "A"-suffix parts like MAX4915AELT+T.

What package type is used for the MAX4914BELT+T?

The MAX4914BELT+T uses a 6-pin μDFN package measuring 2mm × 2mm with 0.5mm pitch and wettable flanks (package code L622-1, outline 21-0164). This RoHS-compliant, lead-free package enables high-density routing and automated optical inspection in compact portable PCBs.

How does the FLAG pin behave during a fault condition in the MAX4914BELT+T?

In the MAX4914BELT+T, the FLAG pin is an open-drain output that pulls low during latchoff (after 14ms blanking), thermal shutdown (+150°C), or undervoltage lockout (<1.75V). It remains high-impedance otherwise. An external pullup resistor to IN is required - not to VCC - to ensure correct logic levels and minimize leakage during shutdown.

What is the maximum continuous power dissipation for the MAX4914BELT+T at +70°C ambient?

The MAX4914BELT+T in its 6-pin μDFN package has a continuous power dissipation rating of 358mW at TA = +70°C. Above this temperature, power handling derates linearly at 4.5mW/°C due to thermal resistance limitations. This value assumes proper PCB copper area and thermal vias per Maxim's recommended land pattern.