Analog Devices Inc./Maxim Integrated MAX4792EUS+T

Overview

MAX4792EUS+T from Maxim Integrated is a 250mA forward/reverse current-limited load switch in a 4-pin SOT143 package, operating from 2.3V to 5.5V with 0.2Ω on-resistance and 14ms fault-blanking time. It features autoretry behavior (not latch-off), reverse current protection, thermal shutdown at +150°C, and undervoltage lockout at 2.2V - designed for SDIO port protection in handheld devices.

For engineers reviewing the MAX4792EUS+T datasheet, MAX4792EUS+T pinout, MAX4792EUS+T application, or MAX4792EUS+T equivalent, key selection criteria include guaranteed 250mA forward current limit, autoretry timing (98ms typical retry), absence of FLAG pin in SOT143 variant, and compatibility with hot-swap capacitive loads up to ~1.1µF at 5.5V.

Technical Context

The MAX4792EUS+T implements dual-direction current limiting using internal sense resistors and reference comparators to detect forward (IN→OUT) and reverse (OUT→IN) overcurrent faults exceeding 250mA/375mA thresholds. Fault detection triggers a 14ms blanking period before action, preventing false trips during load transients.

Unlike latch-off variants (e.g., MAX4791), the MAX4792EUS+T enters autoretry mode: after blanking, it turns off for ~98ms (tRETRY), then re-enables; this cycle repeats until the overload clears. It lacks FLAG output in its SOT143 configuration and relies solely on ON pin control and thermal/UVLO fault signaling.

Key Specifications

Pinout & Package

MAX4792EUS+T uses a 4-pin SOT143 package (outline 21-0052, package code U4+2) with exposed paddle not connected electrically. Pin 1 = OUT, Pin 2 = GND, Pin 3 = ON, Pin 4 = IN. No FLAG or NC pins present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4792ETT+, the MAX4792EUS+T trades thermal performance for minimal footprint in ultra-thin handhelds; versus TPS22921YZPR, it provides integrated reverse-current handling and autoretry without firmware dependency - critical for robust SDIO hot-swap reliability.

Availability

MAX4792EUS+T is available at Aetrix Electronics and suitable for SDIO card interfaces, USB OTG peripheral protection, and portable GPS receiver power control requiring stable component supply across industrial temperature ranges.

Supply support for MAX4792EUS+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 MAX4789–MAX4794 family was developed specifically for reliable, low-footprint load switching in battery-powered portable electronics with stringent inrush and fault-recovery requirements.

FAQ

What is the guaranteed forward current limit for MAX4792EUS+T?

The MAX4792EUS+T guarantees a minimum forward current limit of 250mA across -40°C to +85°C. This value is tested and specified per the datasheet's Electrical Characteristics table under "Forward Current Limit" for MAX4791/MAX4792 variants. The actual trip point may reach up to 375mA at room temperature, providing design margin against transient surges without compromising safety.

Does MAX4792EUS+T have a FLAG output pin?

No, the MAX4792EUS+T in the 4-pin SOT143 package does not include a FLAG output pin. Unlike the 5-pin SOT23 and 6-pin TDFN versions of the MAX4792, the SOT143 variant omits FLAG entirely - confirmed by the Pin Configurations diagram and Chip Information table. Fault status must be inferred indirectly via ON pin behavior and system-level monitoring of load voltage.

How does the autoretry function work in MAX4792EUS+T?

The MAX4792EUS+T initiates autoretry upon detecting a forward or reverse overcurrent lasting beyond the 14ms blanking time: it disables the switch for ~98ms (tRETRY), then automatically re-enables. If the overload persists, the cycle repeats; if cleared, the switch remains on. This behavior is intrinsic to the MAX4792 part number and independent of package - verified in the Detailed Description and Selector Guide sections.

What is the maximum capacitive load supported by MAX4792EUS+T?

The MAX4792EUS+T supports a maximum output capacitance of approximately 1.1µF when VIN = 5.5V, calculated using C_MAX = (I_{FWD_MIN} × t_{BLANK_MIN}) / ΔV_IN, where I_{FWD_MIN} = 250mA, t_{BLANK_MIN} = 14ms, and allowable input droop ΔV_IN = 100mV. Exceeding this risks false current-limit triggering during hot-swap events.

Is MAX4792EUS+T compatible with 1.8V logic control signals?

No, MAX4792EUS+T requires ON pin logic high ≥2.0V (VIH min) and logic low ≤0.8V (VIL max) for reliable switching - incompatible with 1.8V GPIO without level translation. Its UVLO threshold (2.2V) further mandates that VIN remain above 2.2V for functional operation, making direct interface with 1.8V-only microcontrollers unsafe without external signal conditioning.