XC6221B4127R-G

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

The XC6221B4127R-G is a fixed-output low dropout regulator from Torex Semiconductor, housed in an USPN-4 package. It provides a nominal output voltage of 4.1V with standard accuracy (+/- 2% for VOUT > 1.50V). The device supports a maximum output current of 200mA and operates within an input voltage range of 1.6V to 6.0V. Key electrical characteristics include a typical dropout voltage of 80mV at 100mA load, a supply current of 25μA, and a standby current of 0.01μA. It features a CE control pin without an internal pull-down resistor and includes an internal auto-discharge function for the output capacitor.

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

• Integrates a P-channel MOSFET driver with error amplifier and reference voltage source for stable regulation.
• Includes CL auto-discharge circuitry to rapidly reduce output voltage when the CE pin is deactivated.
• Features fold-back current limiting and short-circuit protection to safeguard against overload conditions.
• Compatible with low ESR ceramic capacitors for phase compensation and noise reduction.

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

• Smart phones
• Portable game consoles
• Digital still cameras
• Mobile devices

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

Verify the specific ordering suffix matches the required package type and output tolerance. Confirm that the B-type designation aligns with the need for the CL auto-discharge feature. Ensure the USPN-4 footprint requirements are met by the PCB layout. Check RoHS compliance status if environmental regulations apply to the final assembly.

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

Select this component when a compact USPN-4 footprint is required alongside high-speed response capabilities. The B-type variant is suitable for applications necessitating rapid output discharge upon shutdown. Consider the 200mA current limit and 6.0V maximum input rating during system design. Evaluate thermal dissipation constraints based on the power loss across the dropout voltage.

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

This part belongs to the XC6221 series of CMOS LDO regulators designed for portable electronics. The series offers various output voltages selectable in 0.05V increments. The USPN-4 package provides an ultra-small form factor compared to standard SOT-25 or USP-4 options, facilitating dense circuit board layouts.

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

XC6221B412MR-G

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

How does the XC6221B series differ from the A series regarding shutdown?

The XC6221B series includes an internal auto-discharge switch that actively discharges the output capacitor when the CE pin is low, whereas the A series relies only on internal resistors for discharge.

What is the recommended output capacitor for stability?

A low ESR ceramic capacitor is recommended. For the 4.1V output, a capacitance value of at least 1.0μF is typically sufficient for phase compensation.