Texas Instruments

LM2776DBVT

LM2776DBVT Description

The LM2776DBVT from Texas Instruments is a high-performance, switched-capacitor voltage inverter designed to generate a regulated negative output voltage from a positive input. This charge pump regulator delivers a fixed -3.3V output with an input range of 2.7V to 5.5V, making it ideal for low-power applications requiring efficient voltage inversion. Operating at a 2MHz switching frequency, it minimizes external component size while providing 200mA of output current. Packaged in a compact SOT-23 form factor, the LM2776DBVT is optimized for space-constrained designs and is RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity.

LM2776DBVT Features

• Ratiometric Operation: Ensures stable output proportional to input voltage, simplifying design.
• High Efficiency (Up to 90%): Achieved through low-dropout (LDO) bypass mode, reducing power loss.
• Low Noise: Integrated filtering minimizes output ripple, critical for noise-sensitive applications.
• No External Schottky Diodes Required: Reduces BOM cost and board space.
• 2MHz Switching Frequency: Enables use of tiny ceramic capacitors (1µF typical).
• Thermal Shutdown & Current Limiting: Protects against overload and overtemperature conditions.

LM2776DBVT Applications

• Portable Electronics: Powers negative rails for OLED displays, audio amplifiers, and sensors in smartphones/tablets.
• Industrial Systems: Generates bipolar supplies for op-amps, data converters, and instrumentation.
• Automotive Infotainment: Inverts voltage for LCD bias and legacy signal conditioning.
• Medical Devices: Provides clean negative rails for biopotential measurement circuits.
• IoT & Wearables: Ideal for battery-powered devices due to low quiescent current (120µA typical).

Conclusion of LM2776DBVT

The LM2776DBVT stands out for its compact size, high efficiency, and simplicity, eliminating the need for inductors or complex feedback networks. Its 2MHz operation and integrated protection make it superior to older charge pumps, while the SOT-23 package ensures compatibility with high-density PCBs. Whether for consumer, industrial, or automotive applications, this regulator delivers reliable performance with minimal external components, reducing both cost and design effort.