Analog Devices Inc./Maxim Integrated MAX38907ATP+

Overview

MAX38907ATP+ from Maxim Integrated is a 4A, high-PSRR nMOS linear regulator in a 20-pin 5mm × 5mm TQFN package, delivering ±1% output accuracy over line, load, and temperature with only 300mV input-to-output headroom at full load. It supports 0.9V–5.5V input and 2.7V–20V BIAS supply, and offers 27 programmable output voltages (0.6V–5.0V) via SELA/SELB/SELC pins for FPGA core rail and DSP power sequencing.

For engineers reviewing the MAX38907ATP+ datasheet, MAX38907ATP+ pinout, MAX38907ATP+ application, or MAX38907ATP+ equivalent, this LDO is selected for high-transient-response, low-noise power delivery in thermally constrained industrial and medical systems where tight DC accuracy, reverse-current blocking, and Power-OK status signaling are required.

Technical Context

The MAX38907ATP+ uses an nMOS pass device architecture with separate IN and BIAS supplies to decouple regulation loop stability from input rail noise. Its feedback path includes a dedicated BYP pin connected to a 1nF–100nF capacitor that sets monotonic soft-start slew rate and reduces reference noise-enabling 28mV load-transient excursion at 4A step change.

Protection is implemented via integrated thermal shutdown (165°C trip, 150°C recovery), programmable inrush limiting, output overcurrent limit (5.6A typ), and active reverse-current blocking triggered when IN falls 6.5mV below OUT-preventing body-diode conduction during fast input collapse with large output capacitance.

Key Specifications

Pinout & Package

MAX38907ATP+ is housed in a 20-pin, 5mm × 5mm, 0.5mm pitch TQFN package with exposed thermal pad (EP). The package supports four-layer PCB thermal design with θJA = 30°C/W and θJC = 2°C/W, enabling reliable 4A operation up to +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS7A8300RGRT and LT3072EFE#PBF, MAX38907ATP+ uniquely combines BIAS-supply independence, ±5% margining, reverse-current blocking, and POK status-making it optimal for high-reliability, thermally demanding, and test-intensive applications like medical imaging and industrial control.

Availability

MAX38907ATP+ is available at Aetrix Electronics and suitable for FPGA core power, DSP I/O supply, medical imaging sensor bias, and industrial PLC analog front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX38907ATP+ 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 power management ICs for industrial, medical, and communications systems.

The MAX38907/MAX38908 product line was designed for high-current, low-noise, and high-PSRR power delivery in thermally constrained environments-targeting FPGA, DSP, and precision analog applications where traditional LDOs fail under fast transients or input brownouts.

FAQ

What is the maximum output current and dropout voltage specification for MAX38907ATP+?

The MAX38907ATP+ delivers up to 4A continuous output current. Its typical dropout voltage is 51mV at 4A load when VOUT = 1.2V and VBIAS = 5V-enabling ultra-low-headroom operation critical for sub-1V core supplies. Dropout increases with higher VOUT or lower VBIAS, as specified in the Electrical Characteristics table under "Dropout Voltage (MAX38907)".

How does the MRG pin function on MAX38907ATP+ and what design value does it provide?

The MRG pin on MAX38907ATP+ enables ±5% output voltage margining: pulling MRG to 0V lowers output by 5%, pulling above 1.4V raises it by 5%, and floating maintains nominal regulation. This provides production test flexibility and field calibration capability without hardware changes-directly supporting functional safety validation and aging analysis in medical and industrial systems.

Does MAX38907ATP+ support remote voltage sensing, and how is it implemented?

Yes, MAX38907ATP+ supports remote voltage sensing via the OUTS pin (Pin 10). Connecting OUTS directly to the load point compensates for PCB trace IR drop, ensuring ±1% output accuracy at the point-of-load-even with 4A current and milliohm-level trace resistance. This is essential for high-precision FPGA core and ADC bias applications.

What protection features are integrated into MAX38907ATP+, and how do they operate under fault conditions?

MAX38907ATP+ integrates thermal shutdown (165°C trip, 150°C recovery), output overcurrent limiting (5.6A typ), reverse-current blocking (triggers when IN drops 6.5mV below OUT), and undervoltage lockout on both IN (0.45V) and BIAS (2.55V) rails. During sustained overload, it cycles on/off between thermal thresholds to prevent damage while maintaining system awareness.

Can MAX38907ATP+ be used with only the IN supply, or is the BIAS supply mandatory?

The BIAS supply is mandatory for MAX38907ATP+ operation. While IN powers the pass device, BIAS (2.7V–20V) independently powers the control circuitry, reference, and protection blocks. Omitting BIAS prevents regulation, disables EN/POK/MRG functionality, and risks instability-even if IN is within range. BIAS must exceed VOUT by ≥2V per datasheet requirements.