Analog Devices Inc./Maxim Integrated MAX6037AAUKADJ+T

Overview

MAX6037AAUKADJ+T from Maxim Integrated is an adjustable, low-dropout, micropower series voltage reference IC with active-low shutdown. It delivers 1.184V to 5V output (set via external resistor divider), ±0.2% initial accuracy, 25ppm/°C max temperature coefficient, and operates from 2.5V–5.5V supply while consuming only 275µA max quiescent current. It is used in precision ADC/DAC biasing, portable medical sensors, and battery-powered wireless transceivers requiring stable low-power references.

For engineers reviewing the MAX6037AAUKADJ+T datasheet, MAX6037AAUKADJ+T pinout, MAX6037AAUKADJ+T application, or MAX6037AAUKADJ+T equivalent, key selection criteria include its adjustable output range, sub-500nA shutdown current, SOT23-5 automotive-grade packaging (-40°C to +125°C), 5mA source/sink capability, and capacitive-load stability with 0.02µF–1µF output capacitors.

Technical Context

The MAX6037AAUKADJ+T is a series-mode bandgap voltage reference with internal trimming for high initial accuracy and low thermal drift. Its ADJ pin enables programmable output using a two-resistor divider, where V_OUT = 1.184V × (1 + R₁/R₂). The device features a dedicated active-low SHDN input that reduces supply current to ≤500nA when asserted.

It maintains regulation across 2.5V–5.5V input, supports load currents up to ±5mA, and exhibits low dropout (≤100mV at 1mA) and low noise (15µV_RMS, 10Hz–1kHz). Output impedance rises to >10MΩ in shutdown, ensuring minimal loading of downstream circuitry during sleep mode.

Key Specifications

Pinout & Package

MAX6037AAUKADJ+T is housed in a 5-pin SOT23-5 package (U5-2 code), measuring 2.9mm × 1.6mm × 1.1mm, with lead-free plating and RoHS compliance. The package supports reflow soldering and is qualified for automotive temperature operation (-40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with MAX6037AAUKADJ+T, MAX6126AASA25+T offers superior temperature stability but sacrifices micropower operation and output flexibility, while ADR3425ARJZ-R7 provides lower quiescent current and better tempco in fixed-voltage use cases but lacks both shutdown and adjustment capability - making MAX6037AAUKADJ+T uniquely suited for battery-powered, multi-voltage, and space-constrained designs.

Availability

MAX6037AAUKADJ+T is available at Aetrix Electronics and suitable for portable medical sensors, wireless LAN transceivers, and precision data acquisition systems requiring stable component supply across automotive and industrial temperature ranges.

Supply support for MAX6037AAUKADJ+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, automotive, and communications applications.

The MAX6037 family was engineered specifically for battery-powered instrumentation and automotive subsystems requiring micropower, wide-input-voltage, and high-accuracy voltage references with shutdown functionality.

FAQ

What output voltage range does the MAX6037AAUKADJ+T support?

The MAX6037AAUKADJ+T supports an adjustable output voltage range from 1.184V to 5V, set using an external resistor divider connected between OUT, ADJ, and GND. The internal reference at the ADJ pin is 1.184V, and V_OUT = 1.184V × (1 + R₁/R₂). This makes MAX6037AAUKADJ+T ideal for designs requiring multiple reference voltages without changing the BOM.

How does the shutdown function work on the MAX6037AAUKADJ+T?

The MAX6037AAUKADJ+T features an active-low SHDN pin (Pin 3). Pulling SHDN below 0.7V disables the output and reduces quiescent current to ≤500nA (typically 50pA). For normal operation, SHDN must be tied to IN. The logic thresholds are V_ENL ≤ 0.7V and V_ENH ≥ 2.0V, compatible with standard CMOS logic levels. This behavior is fully specified across -40°C to +125°C.

What is the minimum and maximum output capacitor value for stable operation of the MAX6037AAUKADJ+T?

The MAX6037AAUKADJ+T is stable with output capacitors ranging from 0.02µF to 1µF. Ceramic capacitors are recommended for low ESR and minimal board area. Values outside this range may cause instability or excessive overshoot during load transients. The 0.02µF lower limit ensures adequate phase margin; the 1µF upper limit avoids excessive turn-on settling time beyond 2.4ms.

Can the MAX6037AAUKADJ+T drive a 5mA load while maintaining regulation?

Yes, the MAX6037AAUKADJ+T can source and sink up to ±5mA while maintaining regulation. At 5mA sourcing, dropout voltage remains ≤410mV (tested at V_OUT = 5V), and load regulation is ≤0.1%/mA. This capability allows direct driving of ADC reference inputs, op-amp bias networks, or small DACs without external buffers - a key advantage in miniaturized designs where MAX6037AAUKADJ+T is deployed.

What is the temperature coefficient specification for the MAX6037AAUKADJ+T, and how is it measured?

The MAX6037AAUKADJ+T has a maximum temperature coefficient of 25ppm/°C (A grade), measured using the "box method": the maximum ∆V_OUT/V_OUT over the full -40°C to +125°C range divided by the temperature span. This spec applies when ADJ is shorted to OUT; with external resistors, total system tempco depends on resistor matching and their individual coefficients - hence 1% low-TCR resistors are recommended for best accuracy.