1.7V–5.5VIN, 1A Low Noise LDO Linear Regulators in TDFN and WLP

The MAX38903A/B/C/D are a Low-Noise Linear Regulators that Delivers up to 1A of Out-Put Current with Only 7uVRMS

Please check latest availability status for a specific part variant.


The MAX38903A/B/C/D are a family of low-noise linear regulators that deliver up to 1A of output current with only 7µVRMS of output noise from 10Hz to 100kHz.

These regulators maintain ±1% output accuracy over a wide input voltage range, requiring only 100mV of input-to-output headroom at full load. The 1200µA no-load supply current is independent of dropout voltage.

The MAX38903A has nine pin-selectable output voltages 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.1V, 3.3V, 4.0V, and 5V. The MAX38903B/C output voltage can be adjusted to a value in the range of 0.6V to 5.0V using two external resistors. The MAX38903B also includes an active-high POK signal for trouble-free load startup.

The MAX38903D has factory-preset output voltages over the range of 0.7V to 5V in 50mV steps. All versions include a programmable output soft-start rate, output over-current and thermal overload protection.

The MAX38903A/B are offered in a 10-pin, 3mm x 3mm TDFN package, while the MAX38903C/D are offered in a 9-bump, 0.4mm pitch, 1.4mm x 1.4mm wafer-level package (WLP).

MAX38903A, MAX38903B, MAX38903C, MAX38903D: Typical Operating Circuits MAX38903A, MAX38903B, MAX38903C, MAX38903D: Typical Operating Circuits Enlarge+

Key Features

  • Delivers Flexible Operating Range
    • 1.7V to 5.5V Input Voltage Range
    • 0.6V to 5.0V Programmable Output Voltage
    • 1A Maximum Output Current
    • 100mV Maximum Dropout at 1A Load
    • < 1µA Shutdown Supply Current
  • Reduces Noise and Improves Accuracy
    • ±1% DC Accuracy Over Load, Line, and Temperature
    • 7µVRMS Output Noise, 10Hz to 100kHz
    • 1200µA Operating Supply Current
    • 70dB PSRR at 10kHz
  • Enables Ease-of-Use and Robust Protection
    • Stable with 4µF(min) Output Capacitance
    • Programmable Soft-Start Rate
    • Overcurrent and Overtemperature Protection
    • Output-to-Input Reverse Current Protection
    • Power-OK Output
  • Reduces Size, Improves Reliability
    • 3mm x 3mm, 10-pin TDFN Package and 1.4mm x 1.4mm, 3 x 3 Bump, 0.4mm Pitch WLP
    • -40°C to 125°C Operating Temperature


  • Communication Systems, Test Equipment, Medical Equipment
  • High-End Audio Systems
  • High-Resolution Data Acquisition Systems

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX38903EVKIT#TDFN: Evaluation Kit for the MAX38903A/MAX38903B
MAX38903EVKIT#WLP: Evaluation Kit for the MAX38903C/MAX38903D
Request Reliability Report for: MAX38903B 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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