Analog Devices Inc./Maxim Integrated MAX15029ATB+T

Overview

The MAX15029ATB+T from Maxim Integrated is a 500mA, low-dropout linear regulator with pMOS pass transistor, operating from 1.425V to 3.6V input and delivering adjustable output from 0.5V to VIN with ±2% accuracy across –40°C to +125°C. It features 40mV typical dropout at 500mA, 315μA typical ground current under full load, and integrated soft-start, short-circuit, and thermal protection - designed for automotive dead-man LDO and high-reliability server power rails.

For engineers reviewing the MAX15029ATB+T datasheet, MAX15029ATB+T pinout, MAX15029ATB+T application, or MAX15029ATB+T equivalent, key selection criteria include its BIAS-free architecture (vs. MAX15030), thermally enhanced 10-pin TDFN package, guaranteed 150mV max dropout at 500mA, and automotive-grade –40°C to +125°C operation with no external bias supply required.

Technical Context

The MAX15029ATB+T uses a p-channel MOSFET pass device (75mΩ typ) eliminating base-drive current and enabling stable operation down to 1.425V input without sacrificing transient response. Its feedback loop references a 0.499V internal bandgap (±2% over temp/load/line), with programmable output via external resistor divider on FB.

Unlike the MAX15030, the MAX15029ATB+T lacks a dedicated BIAS pin and derives all internal supply from IN - simplifying design in single-rail systems but limiting operation when IN drops to 0V. Shutdown draws <5.5μA input current, and EN is referenced to IN (not BIAS), with VIH = 1.05V (VIN = 1.8V).

Key Specifications

Pinout & Package

MAX15029ATB+T is housed in a thermally enhanced 10-pin TDFN package (3mm × 3mm) with exposed pad (EP) for optimal power dissipation. The package is RoHS-compliant and automotive-qualified (–40°C to +125°C junction).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX15030ATB+T and TPL7407LADGKR, the MAX15029ATB+T uniquely balances 500mA capability, 1.425V minimum input, ±2% accuracy over full automotive temperature range, and single-supply simplicity - making it optimal for space-constrained, high-reliability LDO applications without BIAS infrastructure.

Availability

MAX15029ATB+T is available at Aetrix Electronics and suitable for automotive dead-man LDOs, server point-of-load regulation, and optical module biasing requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned qualification.

Supply support for MAX15029ATB+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX15029ATB+T belongs to Maxim's automotive-grade LDO family, engineered for ultra-low dropout, precision output, and robust thermal/short-circuit protection in harsh environments where reliability and minimal dark current are critical.

FAQ

What is the minimum input voltage required for stable operation of the MAX15029ATB+T?

The MAX15029ATB+T operates stably down to 1.425V input across its full –40°C to +125°C temperature range. This allows direct regulation from low-voltage battery sources such as single-cell LiFePO₄ (≈1.8V nominal) or partially discharged 2-cell alkaline packs, with guaranteed 150mV max dropout at 500mA load. Below 1.425V, undervoltage lockout disables regulation to prevent unstable behavior.

Does the MAX15029ATB+T require an external BIAS supply like the MAX15030?

No, the MAX15029ATB+T does not require an external BIAS supply. Unlike the MAX15030ATB+T, it derives all internal bias from the IN pin and has no BIAS pin. This simplifies design in single-rail systems but means the device cannot maintain internal functionality if IN drops to 0V - a key distinction confirmed in the functional diagram and pin description sections of the datasheet.

What is the recommended output capacitor for the MAX15029ATB+T at 500mA load?

The MAX15029ATB+T requires a minimum 2.2μF ceramic output capacitor with low ESR for stable 500mA operation. The datasheet confirms this value delivers only 10mV deviation during 100mA→500mA load steps. Larger values (up to 100μF) further reduce overshoot, but 2.2μF is the verified minimum for full-spec performance - validated across –40°C to +125°C with X5R/X7R dielectrics.

How does the soft-start function work on the MAX15029ATB+T, and what capacitor value is needed?

The MAX15029ATB+T implements soft-start by charging an external capacitor (CSS) from the SS pin using a 5μA current source. When CSS reaches 0.499V, the output begins regulating. For a 5ms soft-start time, use CSS = 10⁻⁵ × t_SS = 0.05μF; the datasheet recommends 0.1μF as standard, yielding ~10ms ramp. This limits inrush current into downstream capacitance and prevents supply sag during power-up sequences.

Is the MAX15029ATB+T qualified for automotive applications, and what evidence supports this?

Yes, the MAX15029ATB+T is automotive-qualified. The ordering table explicitly lists "MAX15029ATB/V+" as –40°C to +125°C with automotive qualification (/V suffix), and the MAX15029ATB+T shares identical package, temperature rating, and electrical specs. All parameters - including ±2% output accuracy, 165°C thermal shutdown, and 150mV dropout - are guaranteed across this full automotive junction temperature range, per the Electrical Characteristics table and Absolute Maximum Ratings.