MAX38903B

Description

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The MAX38903A/B/C/D are a family of low-noise linear regulators that deliver up to 1A of output current with only 7µV_RMS 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).

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
  • 7µV_RMS 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

Applications/Uses

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