The XC6421 series is an ultra small CMOS dual LDO regulator, mounting 300mA 2-channel small high speed LDO. The series features high accuracy, high ripple rejection and low dropout voltage. The series is capable of high density board installation by the ultra small package of two low on-resistance regulators. Both output accuracies are ±1% by laser trimming. Each regulator can be turned off independently to be in stand-by mode by controlling EN pin. In this state, the electric charge at the output capacitor (CL) is discharged via the internal auto-discharge switch, and as a result the VOUT voltage quickly returns to the VSS level. The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors. The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance. Over current protection circuit and over heat protection circuit are mounted, these circuits start working when output current reaches junction temperature or limit current. The two regulators are completely isolated so that a cross talk during load fluctuations is minimized
The XC6421 series is an ultra‑small CMOS dual LDO regulator offering up to 300 mA per channel, high accuracy (±1%/±20 mV), low dropout voltage and built‑in protection features such as over‑current, over‑heat and inrush current protection. It supports an operating voltage range of 1.6 V to 5.5 V and output voltages from 1.2 V to 3.6 V in 0.05 V steps.
The device includes independent EN pins for each regulator, an auto‑discharge function for the output capacitor, and is compatible with low‑ESR ceramic capacitors. Mechanical and packaging details, pin assignments, electrical characteristics, and test circuits are provided for board designers. This manual is written in Chinese.
| Maximum Output Current | 300 mA |
|---|---|
| Operating Voltage Range | 1.6 V – 5.5 V |
| Output Voltage Range | 1.2 V – 3.6 V (0.05 V increments) |
| Output Accuracy | ±1 % (VOUT≥2.00 V) / ±20 mV (VOUT≤1.95 V) |
| Dropout Voltage | 210 mV @ 300 mA (VOUT=3.0 V) |
| Ripple Rejection | 75 dB @ 1 kHz |
| Stand‑by Current | 0.1 µA |
| Typical Power Consumption | 90 µA per channel |
| Package | USP‑6C (3,000 /Reel) |
Each channel can deliver up to 300 mA of output current.
The internal auto‑discharge switch quickly discharges the output capacitor, returning VOUT to the VSS level.
Low‑ESR ceramic capacitors are compatible with the output capacitor (C L).