Analog Devices Inc./Maxim Integrated MAX1563ETC+T

Overview

The MAX1563ETC+T from Maxim Integrated is a programmable 4A USB current-limited high-side power switch with autoreset, fault blanking, and selectable active-high/active-low enable logic. It operates from 4V to 5.5V input, delivers up to 4A continuous load current, features 26mΩ typical on-resistance, and supports hot-swap USB port power-up in notebook and docking station applications.

For engineers reviewing the MAX1563ETC+T datasheet, MAX1563ETC+T pinout, MAX1563ETC+T application, or MAX1563ETC+T equivalent, key selection criteria include its 4mm × 4mm Thin QFN-EP package, 20ms fault-blanking timeout, programmable current limit (1A–4A via ISET resistor), thermal shutdown at +160°C, and open-drain FAULT output for host microprocessor notification.

Technical Context

The MAX1563ETC+T integrates an internal micropower charge pump to drive the gate of a low-R_ON NMOS high-side switch, enabling operation from a single 4V–5.5V supply without external bias. Its dual-mode current limiting distinguishes between continuous overload (>1V V_OUT) and short-circuit (<1V V_OUT) conditions, applying regulated current or pulsed current respectively.

It implements three independent protection mechanisms: 20ms fault-blanking to suppress transient faults during hot-swap, autoreset latching that sources 25mA to detect short removal, and immediate thermal shutdown at +160°C with 15°C hysteresis. The SEL pin configures ON polarity, and FAULT asserts low on UVLO, thermal fault, or sustained current-limit events.

Key Specifications

Pinout & Package

The MAX1563ETC+T is housed in a 12-pin 4mm × 4mm Thin QFN package with exposed pad (EP) internally connected to GND for thermal management. The EP must be soldered to a large PCB ground plane using multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2036IPWR and TPS2051BDBVR, the MAX1563ETC+T uniquely supports 4A programmable current limiting, 20ms fault blanking for robust hot-swap, and autoreset recovery-making it suitable for high-density, high-reliability USB power distribution where discrete control and diagnostics are essential.

Availability

The MAX1563ETC+T is available at Aetrix Electronics and suitable for notebook computers, USB hubs, and docking stations requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1563ETC+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 analog and mixed-signal ICs for power management, interface, sensing, and RF applications.

The MAX1563ETC+T belongs to Maxim's USB power-distribution switch family, designed specifically for robust, programmable, and fault-diagnostic 5V rail management in portable and docked computing systems.

FAQ

What is the maximum continuous output current supported by the MAX1563ETC+T?

The MAX1563ETC+T supports a programmable continuous output current from 1A to 4A, set by an external resistor on the ISET pin using the formula ILIM = 17120 / RISET. At RISET = 4.22kΩ, the device achieves its rated 4A limit, validated across -40°C to +85°C ambient temperature.

How does the MAX1563ETC+T handle short-circuit conditions on the output?

When V_OUT drops below 1V, the MAX1563ETC+T enters short-circuit current-limit mode, pulsing output current at ~1.3× the programmed ILIM. If the condition persists beyond 20ms, FAULT asserts low and the device latches off, then sources 25mA to detect short removal. Once V_OUT exceeds 0.5V for 20ms, autoreset re-enables the switch.

Can the enable logic polarity of the MAX1563ETC+T be changed after PCB assembly?

Yes-the MAX1563ETC+T's ON pin logic polarity is determined by the SEL pin voltage: driving SEL high configures active-high ON, while driving SEL low configures active-low ON. This flexibility allows firmware or hardware configuration without changing the MAX1563ETC+T footprint or bill of materials.

What is the purpose of the exposed pad (EP) on the MAX1563ETC+T package?

The exposed pad (EP) on the MAX1563ETC+T is internally connected to GND and serves as the primary thermal conduction path. It must be soldered to a large PCB ground plane using ≥4 thermal vias to maintain junction temperature within safe limits-especially critical during 4A continuous operation or fault conditions.

Does the MAX1563ETC+T provide undervoltage lockout (UVLO) protection?

Yes-the MAX1563ETC+T includes integrated UVLO with a rising-edge threshold of 3.4V (±0.5V) and 3% hysteresis. When VIN falls below this threshold, the switch disables and FAULT asserts low immediately-preventing erratic behavior during power-up, brownout, or weak-source conditions.