Analog Devices Inc./Maxim Integrated MAX4915AEUK/V+T

Overview

MAX4915AEUK/V+T from Maxim Integrated is a 200mA autoretry current-limit switch in a 5-pin SOT23 package, designed for SDIO and USB load switching. It features 0.2Ω on-resistance, 2.3V–5.5V supply range, 14ms guaranteed blanking time, and reverse current protection. Used to safeguard host processors during hot-swap of capacitive loads in portable electronics.

For engineers reviewing the MAX4915AEUK/V+T datasheet, MAX4915AEUK/V+T pinout, MAX4915AEUK/V+T application, or MAX4915AEUK/V+T equivalent, key selection criteria include autoretry behavior vs. latchoff, forward/reverse current limit thresholds, FLAG fault signaling timing, shutdown current (0.01μA), and SOT23 footprint compatibility with space-constrained designs.

Technical Context

The MAX4915AEUK/V+T implements dual-direction current limiting using internal sense resistors and reference comparators to detect both forward (IN→OUT) and reverse (OUT→IN) overcurrent conditions. Fault detection triggers a 14ms blanking period before action, preventing false trips during hot-swap transients.

Unlike latchoff variants (e.g., MAX4915BELT+T), this autoretry version cycles ON/OFF automatically: after blanking, it enters retry mode (typ. 210–900ms), re-enabling the switch until overload clears. FLAG remains asserted low throughout the fault condition and deasserts only when normal operation resumes.

Key Specifications

Pinout & Package

MAX4915AEUK/V+T is housed in a RoHS-compliant 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4915AEUK/V+T, the μDFN variant offers superior thermal performance but demands larger layout area, while the latchoff variant removes autonomous recovery-making MAX4915AEUK/V+T optimal for compact, self-healing USB/SDIO ports where continuous availability is essential.

Availability

MAX4915AEUK/V+T is available at Aetrix Electronics and suitable for SDIO card slots, USB peripheral ports, and ExpressCard interfaces requiring stable component supply across automotive infotainment, industrial handhelds, and medical data loggers.

Supply support for MAX4915AEUK/V+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 portable applications.

The MAX4914B/MAX4915A/B/MAX4917A/B family targets robust load switching in space-constrained, battery-sensitive systems-emphasizing fault resilience, ultra-low quiescent current, and seamless hot-swap capability.

FAQ

What is the guaranteed forward current limit for MAX4915AEUK/V+T?

The MAX4915AEUK/V+T guarantees a minimum forward current limit of 200mA across its full operating temperature range (-40°C to +85°C). This threshold is tested and specified per the Electrical Characteristics table in the official datasheet, ensuring reliable protection of host circuitry against sustained overloads without requiring external current-sense components.

Does MAX4915AEUK/V+T support reverse current limiting, and what is its value?

Yes, MAX4915AEUK/V+T provides reverse current limiting with a guaranteed minimum threshold of 300mA when VOUT exceeds VIN by ≥0.5V. This feature prevents backfeed from peripherals into the host supply, and the device asserts FLAG and disables the switch if the reverse overload persists beyond the 14ms blanking period-critical for USB OTG and shared-bus architectures.

How does the autoretry functionality of MAX4915AEUK/V+T operate during an overload?

When an overload occurs, MAX4915AEUK/V+T waits 14ms (blanking time), then turns OFF and enters retry mode for ~210–900ms. At the end of retry, it automatically re-enables the switch. If the fault remains, it repeats the cycle; if cleared, it stays ON and deasserts FLAG. This eliminates manual reset requirements in portable devices like smartphones and GPS units.

What is the maximum allowable output capacitance for MAX4915AEUK/V+T?

The maximum safe output capacitance for MAX4915AEUK/V+T is determined by C_{OUT_MAX} < (I_{FWD_MIN} × t_{BLANK_MIN}) / ΔV_IN. With I_{FWD_MIN} = 200mA, t_{BLANK_MIN} = 14ms, and assuming ΔV_IN = 0.3V (typical droop), C_{OUT_MAX} ≈ 9.3µF. Exceeding this risks false fault triggering due to insufficient charging time during blanking-so keep C_OUT ≤ 1µF unless validated.

Can MAX4915AEUK/V+T be used with a 1.8V logic control signal on the ON pin?

No-MAX4915AEUK/V+T requires ON pin voltage ≥1.4V to guarantee turn-on (VIH min), and 1.8V meets this requirement. However, VIH is specified as 1.4V (min) for MAX4915A variants, so 1.8V is fully compatible and ensures robust noise margin. Do not use signals below 1.4V, as the switch may not activate reliably across temperature and process variation.