The HT7551-3 is a low dropout linear regulator (LDO) from Holtek. It is designed to provide a stable and regulated output voltage from a higher input voltage, with minimal voltage drop across the regulator. The HT7551-3 delivers a fixed 3.0V output. This regulator is ideal for use in portable devices and battery-powered applications where efficiency and small size are critical.

Applications:

• Battery-powered devices
• Portable electronics
• Microcontroller power supplies
• Wireless communication devices
• Consumer electronics
• Backup power supplies
• Voltage regulation in noisy environments

Features:

• Low dropout voltage: Typically 170mV at 100mA
• Fixed output voltage: 3.0V
• High output voltage accuracy: ±3%
• Low quiescent current: Typically 4μA
• Over current protection
• Over temperature protection
• Short circuit protection
• Input voltage range: Up to 12V
• SOT-89 package

Benefits:

• Extended battery life: The low quiescent current minimizes power consumption, extending battery life in portable devices.
• Stable output voltage: The high output voltage accuracy ensures reliable operation of connected devices.
• Protection features: The over current, over temperature, and short circuit protection features protect the regulator and connected devices from damage.
• Small size: The SOT-89 package is compact and suitable for space-constrained applications.
• Wide input voltage range: The wide input voltage range allows the regulator to be used with a variety of power sources.

Additional Details:

The HT7551-3 requires minimal external components for operation, typically only input and output capacitors. The low dropout voltage allows the regulator to operate efficiently even when the input voltage is close to the output voltage. The device is designed to be stable with ceramic capacitors, which are commonly used in portable devices due to their small size and low ESR. The thermal shutdown feature protects the regulator from overheating under fault conditions. The device is RoHS compliant. The HT7551-3 is a reliable and cost-effective solution for voltage regulation in a wide range of applications.