Analog Devices Inc./Maxim Integrated MAX38903CANL+

Overview

MAX38903CANL+ from Analog Devices is a 1A, low-noise linear regulator in a 9-bump WLP (1.4mm × 1.4mm, 0.4mm pitch) with resistor-programmable output voltage (0.6V–5.0V), 5.5μVRMS output noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and 100mV max dropout at 1A - designed for high-resolution data acquisition and high-end audio power rails.

For engineers reviewing the MAX38903CANL+ datasheet, MAX38903CANL+ pinout, MAX38903CANL+ application, or MAX38903CANL+ equivalent, this page delivers verified package mapping, confirmed pin functions, real-world soft-start and protection behavior, and validated alternatives for LDO selection in space-constrained, noise-sensitive systems.

Technical Context

The MAX38903CANL+ implements a pMOS-based LDO architecture with internal 0.6V reference, programmable soft-start via BYP capacitor (0.001–0.1μF), and reverse-current protection triggered when VIN falls 10mV below VOUT. Its control loop maintains stability with ≥4μF ceramic output capacitance and achieves 70dB PSRR at 10kHz.

It integrates thermal shutdown (165°C trip, 150°C release), current limiting (~1.4A typ), and active discharge (800Ω to GND on EN low). Unlike MAX38903B, it omits POK; unlike MAX38903A/D, it uses external FB resistors-not pin-selectable or factory-trimmed-making it functionally identical to MAX38903C per datasheet ordering table and pin configuration.

Key Specifications

Pinout & Package

MAX38903CANL+ is housed in a 9-bump wafer-level package (WLP), 1.4mm × 1.4mm, 0.4mm pitch, with exposed substrate contact (no EP pad). The package requires compliant solder reflow per JEDEC J-STD-020 and land pattern per Application Note 1891.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX38903CANL+, MAX38903BATB+ adds POK at the cost of larger footprint and identical noise/performance, while TPL74073PWR trades current capability, noise, and protection for ultra-small size - making MAX38903CANL+ the optimal choice for 1A, low-noise, space-constrained WLP designs.

Availability

MAX38903CANL+ is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, medical imaging signal chains, and automotive infotainment modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX38903CANL+ 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The MAX38903 family targets noise-sensitive, high-accuracy power management in space-constrained applications - delivering 1A LDO performance in sub-2mm² WLP and TDFN packages for next-generation portable and embedded systems.

FAQ

What output voltage range does the MAX38903CANL+ support?

The MAX38903CANL+ supports an output voltage range of 0.6V to 5.0V, set precisely using two external resistors connected to the FB pin. The internal 0.6V reference and low FB bias current (<100nA) ensure accuracy across the full range, with recommended R2 ≤ 300kΩ to minimize error. This makes MAX38903CANL+ ideal for dynamically configurable rails in FPGA or SoC power domains.

Does the MAX38903CANL+ include a power-ok (POK) output?

No, the MAX38903CANL+ does not include a POK output. That feature is exclusive to the MAX38903B variant (e.g., MAX38903BATB+). The MAX38903CANL+ is functionally aligned with the MAX38903C - offering resistor-programmable output, enable control, and active discharge, but omitting POK to optimize die size and WLP footprint. For POK functionality, select MAX38903BATB+ instead.

What is the minimum output capacitance required for stability with the MAX38903CANL+?

The MAX38903CANL+ requires a minimum of 4μF ceramic output capacitance (X5R or X7R dielectric) for guaranteed stability across temperature and DC bias. This value includes derating - actual installed capacitance must remain ≥4μF under worst-case voltage and temperature conditions. Using less than 4μF risks oscillation or poor transient response, especially under 1A load steps.

How does the active discharge feature work on the MAX38903CANL+?

When the EN pin is pulled low, the MAX38903CANL+ connects an internal 800Ω resistor between the OUT pin and GND, actively discharging external output capacitors. This ensures rapid rail collapse during shutdown - critical for safe power sequencing in multi-rail systems. The discharge time depends on output capacitance (e.g., 10μF discharges to <10% in ~18ms), eliminating need for external bleed resistors.

Is the MAX38903CANL+ pin-compatible with other variants in the MAX38903 family?

No, the MAX38903CANL+ is not pin-compatible with TDFN-packaged variants (e.g., MAX38903A/B). It uses a 9-bump WLP (1.4mm × 1.4mm, 0.4mm pitch) with unique bump layout matching MAX38903C - differing from the 10-pin TDFN of MAX38903A/B. Pin functions align with MAX38903C (IN, GND, EN, FB, OUT, BYP), but physical placement and soldering requirements are distinct and require dedicated land pattern per AN1891.