Analog Devices Inc./Maxim Integrated MAX4828ELT+T

Overview

The MAX4828ELT+T from Maxim Integrated is a 100mA current-limiting load switch IC with latchoff fault response, 0.7Ω on-resistance, and dual open-drain flags (FFLG and NOLD), designed for power-path control in portable electronics requiring robust overcurrent and no-load detection.

For engineers reviewing the MAX4828ELT+T datasheet, MAX4828ELT+T pinout, MAX4828ELT+T application, or MAX4828ELT+T equivalent, this device supports precise load switching with guaranteed 14ms blanking time, thermal shutdown, reverse-current protection, and ultra-low 8µA latchoff current - critical for battery-powered systems with tight power budgets and reliability requirements.

Technical Context

The MAX4828ELT+T implements a forward-current limit threshold of 100mA (min) with internal sense-resistor comparison against reference voltages, triggering FFLG after 14ms blanking if overload persists. It lacks autoretry logic and enters persistent latchoff until ON is cycled or input voltage drops below UVLO (2.2V max).

It integrates undervoltage lockout (UVLO), thermal shutdown at +150°C, reverse-current limiting up to 240mA, and no-load detection at ≤10mA via NOLD - all operating across -40°C to +85°C with supply range +2.3V to +5.5V and 65µA quiescent current.

Key Specifications

Pinout & Package

Package: 6-pin µDFN (1mm × 1.5mm), RoHS-compliant, bottom-exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4826ELT+T, the MAX4828ELT+T delivers double the current capacity while retaining latchoff behavior and footprint compatibility; versus MAX4829ELT+T, it trades autoretry for deterministic fault containment - critical where repeated fault attempts could damage downstream components or violate system safety protocols.

Availability

MAX4828ELT+T is available at Aetrix Electronics and suitable for GPS systems, cell phones, and digital still cameras requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.

Supply support for MAX4828ELT+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 consumer applications.

The MAX4826–MAX4831 family targets portable electronics power management, delivering integrated current limiting, fault reporting, and ultra-low quiescent current in minimal-area packages for space-constrained designs.

FAQ

What is the guaranteed current-limit threshold for MAX4828ELT+T?

The MAX4828ELT+T guarantees a minimum forward-current limit of 100mA under all operating conditions (-40°C to +85°C, VIN = +2.3V to +5.5V). This threshold is factory-trimmed and tested; typical values reach 240mA, but design margin must be based on the 100mA min specification. The MAX4828ELT+T does not support adjustable current limiting - the threshold is fixed per device variant.

Does MAX4828ELT+T support autoretry or latchoff fault response?

The MAX4828ELT+T uses latchoff fault response: upon detecting a sustained overcurrent (>100mA for >14ms), it shuts off permanently and asserts FFLG low until ON is toggled or VIN drops below UVLO. It does not implement autoretry - unlike MAX4829ELT+T - making MAX4828ELT+T appropriate for applications requiring definitive fault isolation without automatic re-engagement.

What is the function of the NOLD pin on MAX4828ELT+T?

The NOLD pin on MAX4828ELT+T is an open-drain no-load flag that pulls low when output current falls to ≤10mA, indicating disconnection or sleep mode of the downstream load. It remains high-impedance when ON is low or no fault condition exists. An external pullup resistor (to IN or VCC) is required. NOLD enables firmware to verify load presence before initiating power-down sequences.

What package type and dimensions does MAX4828ELT+T use?

The MAX4828ELT+T is packaged in a 6-pin µDFN (micro Dual Flat No-lead) measuring 1.0mm × 1.5mm with 0.5mm pitch. The package code L611+1 corresponds to this outline (Maxim drawing 21-0147), and the "+" suffix denotes RoHS compliance. Thermal performance relies on proper PCB copper area under the exposed pad, though the pad is not electrically connected.

How does MAX4828ELT+T handle reverse current flow?

The MAX4828ELT+T limits reverse current (from OUT to IN) to 240mA max and shuts off the switch with FFLG assertion if reverse current exceeds this threshold for longer than the 14ms blanking time. This protects upstream power sources (e.g., batteries) from backfeed during system partial power-down, and complements its forward-current limiting to provide bidirectional fault protection.