Analog Devices Inc./Maxim Integrated MAX38903CANL+T

Overview

MAX38903CANL+T from Analog Devices is a 1A, low-noise linear regulator in a 9-bump WLP (1.4mm × 1.4mm, 0.4mm pitch) delivering 5.5μVRMS output noise (10Hz–100kHz), ±1% DC accuracy over load/line/temperature, and 100mV max dropout at full load. It supports 0.6V–5.0V resistor-programmable output voltage and features active discharge (800Ω), programmable soft-start, and overcurrent/thermal protection - ideal for high-resolution data acquisition and medical equipment power rails.

For engineers reviewing the MAX38903CANL+T datasheet, MAX38903CANL+T pinout, MAX38903CANL+T application, or MAX38903CANL+T equivalent, key selection criteria include its WLP footprint, 1.7V–5.5V input range, 1200μA no-load quiescent current, 70dB PSRR at 10kHz, and compatibility with ≥4μF ceramic output capacitance.

Technical Context

The MAX38903CANL+T is the WLP-packaged, resistor-configurable variant of the MAX38903 family (identical to MAX38903C). It uses an internal 0.6V reference and external FB divider to set VOUT from 0.6V to 5.0V, with feedback input bias error minimized by limiting R2 ≤ 300kΩ. Unlike the MAX38903B, it omits the POK output.

Its control architecture includes thermal shutdown (165°C trip, 150°C release), reverse-current protection (activated when VIN falls 10mV below VOUT), and active discharge enabled on EN low. The BYP pin sets soft-start slew rate via external capacitor (0.001–0.1μF), with startup slew = (5V/ms) × (0.01μF/C_BYP).

Key Specifications

Pinout & Package

MAX38903CANL+T is housed in a 9-bump, 0.4mm pitch wafer-level package (WLP), measuring 1.4mm × 1.4mm. The exposed bumps serve as electrical terminals; no exposed thermal pad is present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX38903CANL+T, the MAX38903BATB+ adds POK but increases footprint and height, while the TPL7407LADGKR trades single-rail capability and ultra-low noise for integration density and lower cost - making MAX38903CANL+T optimal for space-constrained, high-precision single-rail applications.

Availability

MAX38903CANL+T is available at Aetrix Electronics and suitable for high-resolution data acquisition systems, medical imaging front-ends, and industrial process control sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX38903CANL+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

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

The MAX38903 family was designed specifically for noise-sensitive analog and mixed-signal applications demanding ultra-low noise, tight DC accuracy, and robust protection - targeting medical, test equipment, and high-end audio systems.

FAQ

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

The MAX38903CANL+T requires a minimum 4μF ceramic output capacitor (X5R or X7R dielectric) for guaranteed stability across temperature and DC bias. This value includes derating - actual capacitance must remain ≥4μF at operating voltage and temperature. Using less risks oscillation or poor transient response.

Does the MAX38903CANL+T include a Power-OK (POK) output?

No, the MAX38903CANL+T does not include a POK output. That feature is exclusive to the MAX38903B variant (e.g., MAX38903BATB+). The MAX38903CANL+T is functionally equivalent to the MAX38903C - offering resistor-programmable output and enable control, but no POK signal.

How is the output voltage set on the MAX38903CANL+T?

The MAX38903CANL+T uses an external resistor divider connected to the FB pin to set VOUT from 0.6V to 5.0V. With a fixed internal 0.6V reference, VOUT = 0.6V × (1 + R1/R2). R2 should be ≤300kΩ to minimize bias current error; for example, setting VOUT = 3.3V requires R1 = 1.35MΩ when R2 = 300kΩ.

What is the purpose of the OUTS pin on the MAX38903CANL+T?

The OUTS pin on the MAX38903CANL+T provides remote output voltage sensing. It connects directly to the load's power input point to compensate for voltage drop across PCB traces or connectors. This ensures regulation accuracy at the load rather than at the IC's OUT pin, critical for precision analog circuits.

Can the MAX38903CANL+T operate with an input voltage lower than its output voltage?

No - the MAX38903CANL+T is a linear regulator requiring VIN > VOUT + dropout voltage (≥100mV at 1A). However, it includes reverse-current protection: if VOUT rises above VIN (e.g., during power-down), the internal pMOS switch opens when VIN drops 10mV below VOUT, blocking reverse current flow and protecting upstream sources.