NCP133AMX115TCG

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The NCP133AMX115TCG is a 500 mA very low dropout (VLDO) CMOS voltage regulator manufactured by onsemi. It features an NMOS pass transistor and a separate bias supply pin (VBIAS). The device provides a fixed output voltage of 1.15 V with ±1.5% accuracy over the temperature range of -40°C to +85°C. It operates within an input voltage range of 0.8 V to 5.5 V and a bias voltage range of 2.4 V to 5.5 V. Key electrical parameters include a typical dropout voltage of 140 mV at 500 mA, a typical bias current of 80 µA, and a power supply rejection ratio (PSRR) of 70 dB at 1 kHz. The component is housed in a compact XDFN6 package measuring 1.2 mm x 1.2 mm.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Features a separate bias supply pin to optimize performance for battery-operated portable applications while maintaining ultra-low quiescent current consumption.
• Incorporates an NMOS pass transistor topology that reduces the impact of output capacitors on loop stability compared to standard PMOS regulators.
• Includes logic level enable input for ON/OFF control and an active output discharge option available in specific device variants.
• Designed for stability with small ceramic output capacitors, supporting effective capacitance values from 2.2 µF to 10 µF.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered equipment
• Smartphones and tablets
• Cameras, DVRs, set-top boxes, and camcorders

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the exact part number against the manufacturer's ordering information table to confirm the specific output voltage and marking code. Confirm the presence of the active output discharge function if required by the design, as this feature is specific to certain suffixes within the NCP133 family. Check for any discontinuation notices or recommended new designs provided by the manufacturer before finalizing procurement plans.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a stable, low-noise 1.15 V rail is needed with high current capability up to 500 mA. Ensure the application can provide a separate bias voltage within the 2.4 V to 5.5 V range, as the regulator requires this distinct supply for internal control circuits. Consider the thermal resistance characteristics and the need for adequate PCB copper area for heat dissipation in space-constrained environments.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This device belongs to the NCP133 series of very low dropout voltage regulators designed for space-constrained and noise-sensitive applications. The series offers both fixed and adjustable voltage versions, utilizing an NMOS pass transistor for improved efficiency and stability. The XDFN6 package allows for miniaturization in modern portable electronics where board space is limited.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Consult the manufacturer's datasheet for discontinued devices and recommended alternatives. Verify that any substitute component matches the 500 mA output current, 1.15 V fixed output, and XDFN6 package dimensions. Ensure the replacement supports the required separate bias voltage architecture if the original circuit design relies on the dual-rail configuration.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the purpose of the BIAS pin on the NCP133?

The BIAS pin supplies power to the internal control circuits, allowing the main input voltage (VIN) to operate close to the output voltage. This separation optimizes performance for battery-operated applications by enabling ultra-low quiescent current consumption.

Is the NCP133AMX115TCG stable with ceramic capacitors?

Yes, the device is designed to be stable with ceramic output capacitors having an effective capacitance in the range of 2.2 µF to 10 µF. It is also stable with multiple parallel capacitors totaling within this range.

How does the Enable (EN) pin function?

Driving the EN pin high enables the regulator, while driving it low puts the device into shutdown mode. The pin includes internal hysteresis to prevent oscillation during threshold transitions.