Analog Devices Inc./Maxim Integrated MAX34406TETG+T

Overview

MAX34406TETG+T from Maxim Integrated is a quad high-side unidirectional current-sense amplifier with fixed 25V/V gain, ±600µV input offset, and four independent overcurrent comparators each with 1.0V threshold. It delivers analog outputs (OUT1–OUT4) for external ADC interfacing and features latched open-drain SHTDN output activated by any OCx assertion. Used in server power rails and telecom base station current monitoring.

For engineers reviewing the MAX34406TETG+T datasheet, MAX34406TETG+T pinout, MAX34406TETG+T application, or MAX34406TETG+T equivalent, key selection criteria include common-mode range (2.0V to 28V), gain accuracy (±0.6% max), shutdown delay programmability via CDLY capacitor, and TQFN-24 (4mm × 4mm) package compatibility with high-density PCB layouts.

Technical Context

The MAX34406TETG+T implements four independent high-side current-sense amplifiers using matched internal resistors (R1 = 400Ω, ROUTx = 10kΩ) to achieve precise 25V/V gain. Each channel's supply is derived from its INx+ bias voltage, eliminating need for separate amplifier supplies.

Its overcurrent detection architecture uses a fixed 1.0V reference (±20mV hysteresis, ±5mV offset) across all four comparators; outputs OC1–OC4 are logically ORed and fed into a latch whose assertion delay is set by an external capacitor on CDLY (tDLY = CCDLY × VDD/10µA). The SHTDN output remains latched until ENA is toggled low.

Key Specifications

Pinout & Package

MAX34406TETG+T is housed in a 24-pin TQFN-EP package (4mm × 4mm, 0.5mm pitch) with exposed pad (EP) for thermal management. Pin 1 is located at top-left per JEDEC MO-220 standard; EP must be soldered to ground plane for optimal thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad high-side current-sense amplifier applications.

Compared with MAX34406TETG+T, INA229AIDGST trades autonomous hardware shutdown for higher-resolution digitization, while MAX40056ATA+T offers lower offset but requires external fault-handling circuitry-making MAX34406TETG+T uniquely suited for systems needing integrated, latchable overcurrent protection across four rails.

Availability

MAX34406TETG+T is available at Aetrix Electronics and suitable for server power management, telecom base station protection, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.

Supply support for MAX34406TETG+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 and mixed-signal ICs for industrial, communications, and computing applications with emphasis on reliability and integration.

The MAX34406 product line delivers integrated high-side current sensing with autonomous overcurrent response for power system monitoring and protection in space-constrained infrastructure equipment.

FAQ

What is the exact gain and gain error specification for MAX34406TETG+T?

The MAX34406TETG+T has a fixed gain of 25V/V. Its gain error is guaranteed at ±0.6% maximum over the full −40°C to +85°C operating temperature range. This specification applies specifically to the 'T' variant (MAX34406T) and is confirmed in the Electrical Characteristics table on page 2 of the official datasheet. The MAX34406TETG+T implements this gain using internal resistor matching (R1 = 400Ω, ROUTx = 10kΩ) and does not require external components to set gain.

How does the SHTDN output behave during an overcurrent event on MAX34406TETG+T?

When any of the four overcurrent comparators (OC1–OC4) asserts due to VOUTx exceeding 1.0V, the MAX34406TETG+T drives SHTDN to high impedance after a programmable delay determined by the capacitor on CDLY. Once asserted, SHTDN remains latched in that state until the ENA pin is actively toggled low. This behavior provides reliable, non-transient fault signaling to downstream power controllers or supervisors without requiring continuous software polling.

Can MAX34406TETG+T operate with a 3.3V supply rail and still monitor a 12V power rail?

Yes. The MAX34406TETG+T separates its logic supply (VDD = 2.7V–5.5V) from its sensing domain: its common-mode input range is 2.0V–28V independent of VDD. So with VDD = 3.3V, it can accurately monitor current on a 12V rail via INx+/INx− inputs while delivering clamped analog outputs (0–6V) compatible with 3.3V ADCs. This dual-domain architecture eliminates level-shifting requirements.

What is the function of the CDLY pin on MAX34406TETG+T, and how is delay calculated?

The CDLY pin on MAX34406TETG+T accepts an external capacitor (CCDLY) to ground that sets the SHTDN assertion delay after overcurrent detection. Delay time is calculated as tDLY = CCDLY × (VDD ÷ 10µA). For example, with VDD = 3.3V and CCDLY = 10nF, tDLY = 3.3ms. The capacitor is automatically discharged at power-up and whenever all OCx outputs return low, ensuring deterministic reset behavior without external circuitry.

Does MAX34406TETG+T require Kelvin connections for accurate current sensing?

Yes - Kelvin (four-terminal) connections are strongly recommended for the sense resistor when using MAX34406TETG+T. PCB trace resistance between RSENSE and INx− introduces direct gain error (ΔG/G ≈ RTRC/R1). With R1 = 400Ω for the 'T' variant, just 4mΩ of trace resistance adds 1% gain error. Using Kelvin layout or a four-terminal resistor minimizes this error and preserves the ±0.6% specified gain accuracy in production systems.