Fixed Output Low-Dropout Linear Regulator (LDO)

Voltage Conversion & Regulation

It stabilizes wide-range input voltage (1.2V~5.5V) from batteries or preceding DC-DC converters into clean, constant 3.3V DC voltage to power downstream ICs.

Low-Noise Power Purification

Unlike DC-DC converters, LDOs generate nearly no switching ripple and feature high PSRR. They supply low-noise, clean power to MCUs, sensors and RF modules.

Low Dropout for Extended Battery Life

Its dropout voltage is only 0.31V. It can steadily output 3.3V even when the lithium battery voltage drops to 3.6V or 3.5V. Ultra-low quiescent current leads to negligible power consumption during device sleep mode, greatly extending the battery life of portable equipment.

Controllable Power Switch

The EN pin connects to MCU I/O ports. Software can turn the 3.3V power supply on or off to cut power to idle modules for energy saving.

Safety Protection

It automatically performs current limiting or shuts down in case of load short circuits and chip overheating, preventing damage to main ICs and power circuits.

III. Main Applications

1. Battery-powered Portable Devices (Primary Application)

Smart bracelets, smart watches, TWS Bluetooth earbudsHandheld thermometers, blood glucose meters, portable detectorsWireless remote controllers, barcode scanners, portable recorders

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