XC6705A521MR-G

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

The XC6705A521MR-G is a high-speed low dropout (LDO) voltage regulator manufactured by Torex Semiconductor. It provides a fixed output voltage of 5.2 V with a maximum output current of 200 mA. The device operates within an input voltage range of 3.5 V to 20.0 V and maintains a typical quiescent current of 1.2 µA, dropping to 0.15 µA in standby mode. It features a ripple rejection ratio of 50 dB at 1 kHz and includes built-in soft-start and CL discharge functions. The component is housed in a SOT-25-5 package and supports operation across an ambient temperature range of -40°C to +105°C.

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

• Integrates a P-channel driver FET with internal phase compensation for stable operation using low ESR ceramic capacitors.
• Includes a charge leakage function that rapidly discharges the output capacitor to the ground level during standby mode.
• Features a soft-start mechanism that linearly increases the reference voltage to suppress inrush currents and output overshoot upon activation.

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

• Smart meters and gas detectors
• Smoke detectors and sensor/IoT devices
• Factory automation (FA) equipment

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

Verify the specific suffix MR-G corresponds to the SOT-25 package configuration before procurement. Confirm that the A-type designation is required for applications necessitating the built-in CL discharge functionality. Ensure the ordering information matches the exact voltage code 521 for the 5.2 V specification. Cross-reference datasheet electrical characteristics against system requirements for dropout voltage and thermal dissipation limits.

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

Select this component when a fixed 5.2 V output is required from inputs up to 20 V. The A-type variant is necessary if automatic output capacitor discharge is needed to prevent system malfunctions during standby. Evaluate PCB layout constraints as the SOT-25 package requires proximity of input and output capacitors to ensure stability. Consider the power dissipation capabilities relative to the expected load current and ambient temperature conditions.

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

This part belongs to the XC6705 series of high-speed LDO regulators utilizing CMOS processes. The series offers low supply current alongside high accuracy and ripple rejection. Internal circuitry comprises a reference voltage supply, error amplifier, Pch driver FET, current limit circuit, and thermal shutdown circuit. The output voltage is fixed internally via laser trimming, ensuring precise regulation without external resistors.

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

XC6705A521GR-G

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

What is the function of the CL discharge feature in the A type?

The CL discharge function uses an Nch FET to quickly discharge the charge stored in the output stabilization capacitor to the VSS level during standby mode, preventing application malfunction due to residual charge.

How does the soft-start function operate?

Upon receiving a High signal on the CE pin, the soft-start function linearly increases the reference voltage connected to the error amplifier over approximately 1.0 ms, allowing the output voltage to rise smoothly and suppressing inrush current.