Analog Devices Inc./Maxim Integrated MAX3355EEUD+

Overview

The MAX3355EEUD+ from Maxim Integrated is a USB On-The-Go (OTG) charge pump and comparator IC designed to enable dual-role device functionality in portable systems. It delivers 5V at ≥8mA from an internal charge pump, features ±15kV ESD protection on VBUS and ID_IN, supports logic supply down to +1.65V, and operates across -40°C to +85°C - enabling integration into cell phones, MP3 players, and digital cameras requiring compliant OTG session negotiation.

For engineers reviewing the MAX3355EEUD+ datasheet, MAX3355EEUD+ pinout, MAX3355EEUD+ application, or MAX3355EEUD+ equivalent, this page provides verified functional context, confirmed pin roles, real-world timing thresholds (e.g., VTHVBUSVLD = 4.4–4.63V), load-detection behavior (tVBUSCHRG = 56–155ms), and validated alternatives for USB OTG power and status management.

Technical Context

The MAX3355EEUD+ implements a regulated charge-pump architecture generating VBUS from +2.6V to +5.5V input, with guaranteed 8mA sourcing capability and backdrive tolerance up to +6.0V. Its dual comparators monitor VBUS against four defined thresholds - VTHSESEND (0.4–0.6V), VTHSESVLD (1.12–1.68V), VTHVBUSVLD (4.4–4.63V), and VTH,SHDN (0.8–2.4V) - to support Session Request Protocol (SRP) and Host Negotiation Protocol (HNP) handshaking.

Device identity is determined by ID_IN state (GND = Device A, open = Device B), level-shifted to VL and output as ID_OUT. The charge pump is enabled only when OFFVBUS = VL and ID_IN = GND; shutdown mode (SHDN = GND) reduces ICCSHDN to <30µA while retaining VBUS monitoring via STATUS2.

Key Specifications

Pinout & Package

The MAX3355EEUD+ is packaged in a 14-pin TSSOP (4.4mm width), pin-compatible with industry-standard layout practices and reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB OTG charge pump and comparator applications.

Compared with MAX3355EETD+, the MAX3355EEUD+ offers higher power dissipation margin (727mW vs. 520mW) and standard TSSOP handling, while differing from TPS650532RTET by providing purpose-built OTG comparator outputs and simpler signal-chain integration - making it superior for cost-sensitive, single-function OTG implementations.

Availability

The MAX3355EEUD+ is available at Aetrix Electronics and suitable for smartphone OTG host mode, MP3 player peripheral mode, digital camera data transfer, PDA sync and charging, and embedded USB device role negotiation requiring stable component supply and full USB OTG compliance.

Supply support for MAX3355EEUD+ 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 high-performance analog, mixed-signal, and RF solutions for industrial, communications, and consumer applications.

The MAX3355E product line delivers integrated USB OTG power and status management - designed specifically to simplify dual-role device implementation in battery-powered portable electronics without external discrete components.

FAQ

What is the primary function of the MAX3355EEUD+ in a USB OTG system?

The MAX3355EEUD+ serves as a dedicated USB OTG charge pump and comparator IC that enables dual-role device operation. It generates a compliant 5V VBUS supply (≥8mA), detects device identity via ID_IN, monitors VBUS voltage with precision thresholds, and outputs status signals (STATUS1/STATUS2) for Session Request Protocol (SRP) and Host Negotiation Protocol (HNP) - all within a single 14-pin TSSOP package. This eliminates the need for discrete charge pumps, comparators, and ESD protection in portable OTG designs.

Does the MAX3355EEUD+ support both Device A and Device B configurations?

Yes, the MAX3355EEUD+ supports both Device A (host role) and Device B (peripheral role) configurations through hardware-based ID_IN detection. When ID_IN is connected to GND, the device configures as Device A and activates the charge pump to generate VBUS. When ID_IN is left open (internally pulled up to VCC), it configures as Device B and monitors incoming VBUS instead. The ID_OUT pin provides a VL-referenced copy of ID_IN for system-level identification, and STATUS1/STATUS2 outputs encode VBUS voltage bands per USB OTG specification tables.

What are the key ESD protection specifications for the MAX3355EEUD+?

The MAX3355EEUD+ provides ±15kV ESD protection on both VBUS and ID_IN pins per the Human Body Model (HBM) and IEC 61000-4-2 Air-Gap Discharge test methods, plus ±8kV per IEC 61000-4-2 Contact Discharge. This protection is built-in and functional across all operating modes - normal operation, shutdown, and unpowered states - eliminating the need for external TVS diodes in most handheld USB OTG implementations. A 1µF capacitor must be placed from VBUS to GND, close to the device, to ensure full ±15kV performance.

How does the MAX3355EEUD+ handle VBUS load detection and current limiting?

The MAX3355EEUD+ uses automatic CLOAD detection to adapt its VBUS charging behavior: for loads <13µF, it guarantees VBUS rises above 2.0V; for loads >96µF, it limits VBUS to <2.2V - enabling reliable distinction between attached peripherals and cable-only conditions. The internal charge pump includes short-circuit current limiting at 200mA, and VBUS output ripple remains ≤100mV at 8mA load with proper 1µF reservoir capacitance. The VBUS source current is guaranteed ≥8mA across temperature and process variation.

What is the shutdown behavior of the MAX3355EEUD+ and how does it affect VBUS monitoring?

When SHDN is pulled to GND, the MAX3355EEUD+ enters shutdown mode with supply current reduced to <30µA. In this state, the charge pump and comparators are disabled - except that STATUS2 remains active to indicate VBUS voltage relative to VTH,SHDN (0.8–2.4V), per Table 2. STATUS1 defaults to logic 0. This allows the host system to detect external VBUS presence (e.g., from a connected host) while consuming negligible power, enabling efficient wake-on-attach functionality in battery-powered OTG devices.