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

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/B/C/D has an 800Ω active discharge feature to quickly discharge output capacitors.

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).

Applications

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

* 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

* Active Discharge of 800Ω at OUT

* 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