Analog Devices Inc./Maxim Integrated MAX14643ETA+T

Overview

MAX14643ETA+T from Maxim Integrated is a USB 2.0 host charger adapter emulator IC that combines Hi-Speed analog switches with CDP/DCP/SDP charging emulation logic, supporting 2A autodetect mode, DP/DM short-on-resistance of 70–128 Ω, ±15kV ESD protection on DP/DM, and active-high CEN output for CLS enable - deployed in laptop USB hubs and universal chargers for Apple devices.

For engineers reviewing the MAX14643ETA+T datasheet, MAX14643ETA+T pinout, MAX14643ETA+T application, or MAX14643ETA+T equivalent, key selection criteria include GPIO-controlled AM2/FM/PM/CM mode switching, CEN timing behavior during CB0/CB1 transitions, USB 2.0 signal integrity (1000MHz bandwidth, <40ps skew), and compatibility with USB BC 1.2 and YD/T1591-2009 standards.

Technical Context

The MAX14643ETA+T implements a dual-path USB switch architecture: TDP/TDM ↔ DP/DM pass-through in PM/CM modes, and internal resistor-divider networks (e.g., 43.2kΩ/49.9kΩ on DP/DM in AM2 mode) for Apple charger detection. Its CDP emulation engine monitors DP/DM voltage thresholds (100–205mV) and supports automatic peripheral reset via 1s (typ) CEN pulse on CB0/CB1 edge transitions.

It operates across VCC = 3.0–5.5V (with Apple mode requiring 4.75–5.25V), delivers <200µA supply current in AM2 mode, and integrates low-capacitance (5pF typ) Hi-Speed switches with 3.5–6.5Ω on-resistance and <20ns turn-on time - all within an 8-pin 2mm × 2mm TDFN-EP package rated for –40°C to +85°C.

Key Specifications

Pinout & Package

MAX14643ETA+T is housed in an 8-pin, 2mm × 2mm TDFN-EP package with exposed pad (EP/GND) soldered to PCB ground plane for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB host charger emulator applications.

Compared with MAX14641ETA+T and MAX14642ETA+T, the MAX14643ETA+T uniquely balances 2A autodetection, active CEN-based peripheral reset, and full USB BC 1.2 compliance - making it optimal for universal chargers and hubs requiring robust, hands-off iOS/Android compatibility without I2C overhead.

Availability

MAX14643ETA+T is available at Aetrix Electronics and suitable for laptop USB hubs, universal wall chargers, and embedded standby-charging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX14643ETA+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 industrial, computing, and consumer applications.

The MAX14640–MAX14644 family was developed specifically to replace discrete USB charger detection circuits with integrated, standards-compliant adapter emulators for host-side USB charging in space-constrained portable systems.

FAQ

What is the primary function of the MAX14643ETA+T in a USB system?

The MAX14643ETA+T functions as a USB host charger adapter emulator, enabling a USB host (e.g., laptop or hub) to identify itself as a dedicated or charging downstream port to connected devices. It does this by configuring internal resistor networks and DP/DM switching states - allowing Apple, Android, and USB BC-compliant devices to draw up to 2A without enumeration. The MAX14643ETA+T achieves this autonomously via GPIO inputs CB0/CB1, eliminating need for microcontroller intervention.

How does the CEN pin operate on the MAX14643ETA+T, and what is its design purpose?

The CEN pin on the MAX14643ETA+T is an active-high open-drain output used to enable the current-limit switch and VBUS ON. When CB0 or CB1 transitions (low-to-high or high-to-low), CEN is driven low for 1 second (typical) to reset the peripheral connected to VBUS - ensuring reliable reconnection after host power-state changes. This behavior is intrinsic to the MAX14643ETA+T's auto-peripheral-reset feature and requires no external timing components.

Which charging modes does the MAX14643ETA+T support, and how are they selected?

The MAX14643ETA+T supports four GPIO-controlled modes: AM2 (2A autodetect), FM (forced DCP via DP/DM short), PM (USB pass-through), and CM (pass-through with CDP emulation). Mode selection is determined by the logic levels on CB0 and CB1 per the truth table - e.g., CB1=0/CB0=0 enters AM2 mode. Unlike I2C variants (MAX14640/MAX14651), the MAX14643ETA+T does not require configuration registers or address lines.

Does the MAX14643ETA+T support USB Battery Charging Specification Revision 1.2?

Yes, the MAX14643ETA+T fully complies with USB Battery Charging Specification Revision 1.2, including CDP emulation, DCP detection, and SDP support in both active (S0) and standby (S3/S4/S5) states. It also meets China's YD/T1591-2009 standard and supports Apple BC Rev 1.2 devices in sleep mode - verified by internal comparator thresholds (100–205mV) and resistor-divider values (e.g., RDP_CDP = 14.25–24.8kΩ).

What are the thermal and packaging specifications critical for MAX14643ETA+T layout?

The MAX14643ETA+T uses an 8-pin 2mm × 2mm TDFN-EP package with exposed pad (EP/GND) that must be soldered to a solid PCB ground plane. Thermal resistance is Junc-to-Ambient (θ_JA) = 83.9°C/W and Junc-to-Case (θ_JC) = 37°C/W. Layout requires a 0.1µF ceramic decoupling capacitor placed adjacent to the VCC pin, and the EP pad must be thermally connected with ≥4 thermal vias to inner ground layers to maintain junction temperature ≤150°C under 2A load conditions.