Analog Devices Inc./Maxim Integrated MAX4827ELT+T

Overview

The MAX4827ELT+T from Maxim Integrated is a 50mA current-limiting load switch with autoretry functionality, designed for fault-protected power delivery in portable electronics. It features 0.7Ω on-resistance, +2.3V to +5.5V supply range, 14ms guaranteed blanking time, and dual open-drain flags (FFLG and NOLD) for real-time fault and no-load monitoring - deployed in GPS modules and digital cameras where transient-safe hot-swap capability is critical.

For engineers reviewing the MAX4827ELT+T datasheet, MAX4827ELT+T pinout, MAX4827ELT+T application, or MAX4827ELT+T equivalent, key selection criteria include autoretry behavior vs. latchoff mode, 50mA forward-current limit tolerance, 10mA no-load detection threshold, and µDFN-6 thermal performance under short-circuit duty cycling.

Technical Context

The MAX4827ELT+T implements forward/reverse current limiting via internal sense-resistor comparison against dual reference voltages, triggering FFLG after 14ms blanking if overload persists. Its autoretry architecture cycles between 14ms on (tBLANK) and ~196–840ms off (tRETRY), reducing average power dissipation by >90% during sustained faults.

It integrates undervoltage lockout (2.2V rising threshold), thermal shutdown at +150°C with 15°C hysteresis, reverse-current protection up to 120mA, and active-high ON control with <1µA input leakage. The device operates across –40°C to +85°C and delivers 65µA quiescent current at VIN = 3.3V.

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 MAX4827ELT+T provides autonomous fault recovery without MCU intervention, while MAX4829ELT+T trades lower current limit for higher load capability - both share identical pinout, footprint, and interface logic, enabling direct BOM substitution where current rating permits.

Availability

MAX4827ELT+T is available at Aetrix Electronics and suitable for GPS systems, digital still cameras, MP3 players, and smartphone peripheral ports requiring stable component supply, automotive-grade reliability, and compact µDFN packaging.

Supply support for MAX4827ELT+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, communications, and consumer applications.

The MAX4826–MAX4831 family targets portable electronics requiring robust, autonomous power-switching with integrated fault diagnostics - optimized for space-constrained, battery-powered systems needing zero-maintenance protection.

FAQ

What is the forward current limit specification for the MAX4827ELT+T?

The MAX4827ELT+T guarantees a minimum forward current limit of 50mA under all operating conditions (–40°C to +85°C, VIN = +2.3V to +5.5V). This value is tested and specified in the Electrical Characteristics table, ensuring consistent overcurrent protection without external components. The MAX4827ELT+T maintains this limit across its full temperature and voltage range, making it suitable for battery-powered devices where load current must remain tightly bounded.

Does the MAX4827ELT+T support reverse-current protection?

Yes, the MAX4827ELT+T provides reverse-current protection with a guaranteed limit of 120mA when V_OUT – V_IN < 0.5V. If reverse current exceeds this threshold for longer than the 14ms blanking time, the switch opens and asserts the FFLG flag. This feature prevents backfeeding from downstream circuits into the supply rail - critical in systems with multiple power domains or shared batteries. The MAX4827ELT+T implements this protection using internal sensing, requiring no external diodes or MOSFETs.

How does the autoretry function of the MAX4827ELT+T operate during an overcurrent event?

Upon detecting forward overcurrent, the MAX4827ELT+T waits 14ms (blanking time), then turns off and enters retry mode: it remains off for 196–840ms (tRETRY), then automatically re-enables. If the fault persists, the cycle repeats; if cleared, the switch stays on. This behavior eliminates manual reset requirements and reduces average power dissipation by >90% during sustained faults. The MAX4827ELT+T's autoretry is intrinsic to its silicon design and requires no external timing components or firmware control.

What is the purpose of the NOLD pin on the MAX4827ELT+T?

The NOLD pin on the MAX4827ELT+T is an open-drain output that pulls low when output current falls below 10mA - indicating no-load or sleep-state conditions. It remains high-impedance when ON = low or during tRETRY periods (except under reverse-fault conditions). This signal allows the host microcontroller to detect peripheral disconnection or low-power states without polling current sensors. The MAX4827ELT+T uses NOLD to simplify power-state awareness in portable devices like GPS receivers and digital cameras.

What package type and footprint does the MAX4827ELT+T use?

The MAX4827ELT+T uses a 6-pin µDFN package measuring 1.0mm × 1.5mm with an exposed thermal pad on the bottom. Its land pattern follows Maxim's outline number 21-0147 (package code L611+1), and it is RoHS-compliant. The small footprint enables placement in ultra-dense layouts typical of smartphones and wearables. The MAX4827ELT+T shares this exact package with other members of the MAX4826–MAX4831 family, allowing layout reuse across variants with different current ratings or fault-handling modes.