Analog Devices Inc./Maxim Integrated MAX4993ELB+T

Overview

MAX4993ELB+T from Maxim Integrated is a double-pole/double-throw (DPDT) analog switch optimized for high-fidelity audio routing, featuring 0.3Ω typical on-resistance, 0.004% THD+N, slow turn-on time (340–390ms at VCC = +2.7V), active-low enable (EN), and operation from +1.8V to +5.5V single supply. It reduces click-and-pop in speaker/headset switching applications by controlling slew rate during power-up.

For engineers reviewing the MAX4993ELB+T datasheet, MAX4993ELB+T pinout, MAX4993ELB+T application, or MAX4993ELB+T equivalent, key selection criteria include DPDT configuration with EN control, guaranteed -40°C to +85°C operation, UTQFN-10 package footprint, low RON flatness (1mΩ), and compatibility with DC-biased audio amplifiers requiring coupling-capacitor-based click suppression.

Technical Context

The MAX4993ELB+T implements break-before-make switching with bidirectional signal paths across two independent DPDT channels. Its slow turn-on time is internally generated and fixed-no external components required-and functions only when COM_ terminals serve as outputs, enabling controlled charging of output coupling capacitors.

It features an active-low EN input that places all switches in high-impedance state and reduces ICC to ≤1μA when driven high. Digital control uses a single CB input per channel pair, with logic thresholds VIH = 1.4V (min) and VIL = 0.5V (max), supporting direct interfacing with 1.8V–5.5V logic families.

Key Specifications

Pinout & Package

MAX4993ELB+T is housed in a 10-pin UTQFN package (1.4mm × 1.8mm × 0.55mm, 0.4mm pitch), optimized for space-constrained portable audio designs. Thermal resistance θJA = 143.1°C/W enables reliable operation at full load in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DPDT analog switch applications.

Compared with MAX4994EVB+, MAX4993ELB+T trades speed for click/pop immunity; versus TSM1022DPYR, it delivers lower RON, smaller UTQFN packaging, and system-level audio optimization-making it uniquely suited for premium portable audio switching where acoustic performance and miniaturization are mandatory.

Availability

MAX4993ELB+T is available at Aetrix Electronics and suitable for speaker headset source switching, cellular phone audio routing, and portable MP3 player output selection requiring stable component supply, RoHS-compliant packaging, and extended temperature support (-40°C to +85°C).

Supply support for MAX4993ELB+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, communications, and consumer applications.

The MAX4993ELB+T belongs to Maxim's low-RON audio switch product line, engineered specifically for click-and-pop–sensitive portable audio systems requiring DPDT functionality, ultra-low distortion, and minimal board space.

FAQ

What is the primary function of the EN pin on the MAX4993ELB+T?

The EN pin on the MAX4993ELB+T is an active-low enable input. When driven high, it places all analog switches in high-impedance state and reduces quiescent supply current to ≤1μA. When driven low, the MAX4993ELB+T operates normally under CB control. This feature allows system-level power gating without altering signal routing logic, making it ideal for battery-sensitive portable audio applications using the MAX4993ELB+T.

Does the MAX4993ELB+T support bidirectional analog signal flow?

Yes, the MAX4993ELB+T supports fully bidirectional analog signal flow across all terminals (NO_, NC_, COM_). However, its slow turn-on time and click/pop reduction capability are only effective when COM_ terminals serve as outputs-i.e., when the speaker or headset load is connected to COM1 and COM2. The MAX4993ELB+T maintains 0.3Ω typical RON and 0.004% THD+N regardless of signal direction, enabling flexible PCB layout and signal path design.

Can the MAX4993ELB+T operate from a 1.8V supply while maintaining full performance?

Yes, the MAX4993ELB+T is fully specified from +1.8V to +5.5V. At VCC = +1.8V, RON increases to 0.5Ω (max), THD+N remains ≤0.004%, and turn-on time extends to ~400ms-still effective for click/pop suppression. Supply current stays below 2.5μA (typ) with EN high. This makes the MAX4993ELB+T suitable for single-cell Li-ion (2.7–4.2V) and coin-cell–powered devices where low-voltage operation is essential.

How does the MAX4993ELB+T achieve click-and-pop reduction without external components?

The MAX4993ELB+T achieves click-and-pop reduction through an internally generated slow turn-on time of 340–390ms (at VCC = +2.7V), eliminating the need for external RC networks. This controlled slew rate limits inrush current into output coupling capacitors when driving DC-biased audio amplifiers. The MAX4993ELB+T requires only proper COM_-to-load connection and standard 0.1µF VCC bypassing-no additional passive components or firmware timing adjustments are needed.

What is the maximum continuous current rating per channel for the MAX4993ELB+T?

The MAX4993ELB+T supports ±350mA continuous current per COM_, NC_, or NO_ terminal, with peak ratings of ±700mA (1ms, 50% duty) and ±1.5A (1ms, 10% duty). These ratings apply across the full -40°C to +85°C operating range and are validated under worst-case thermal conditions in the UTQFN-10 package. For sustained 350mA operation, ensure PCB copper area and airflow meet θJA = 143.1°C/W requirements to avoid junction temperature exceedance.