Power Electronics
Ultra-Low Noise, High PSRR Linear Voltage Regulators

Ultra-Low Noise, High PSRR Linear Voltage Regulators

   

Two high-current, low-dropout (LDO) linear voltage regulator from Texas Instruments Incorporated exhibit excellent noise and power supply rejection ratio (PSRR) performance in very small, easy-to-use packages. The 250-mA LP5907 and 800-mA LP38798 LDOs feature less than 10-µVrms output noise over the 10-Hz to 100-kHz bandwidth, eliminating the need for expensive and bulky filtering in a wide range of high-performance applications.

Designed to meet the requirements of RF and analog circuits in applications such as mobile handsets, tablets and WiFi devices, the LP5907 linear regulator provides ultra-low noise, high PSRR, low quiescent current and low line or load transient response figures. Using innovative design techniques, the LP5907 offers industry-leading noise performance without a bypass capacitor, and includes the ability for remote output capacitor placement. The device is designed to work with 1-µF input and output ceramic capacitors, and when used in conjunction with the award-winning WEBENCH® online design tool, the LP5907 speeds and simplifies the design process.

LP5907 features output noise of less than 10-uVrms provides a clean supply for noise-sensitive applications. PSRR of 75 dB at 1 kHz keeps a noisy supply from reaching target application. Output voltage range between 1.2 V and 4.5 V in 25 mV steps enables a variety of designs. Very small 0.65-mm by 0.65-mm by 0.40-mm micro SMD package allows placement very close to target application.

The LP38798 is a high-performance linear regulator capable of supplying 800-mA of output current. Designed to meet the requirements of sensitive RF and analog circuitry in applications such as basestations, the LP38798 features a unique linear topology on an advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply frequencies. The LP38798 is stable with both ceramic and tantalum output capacitors and requires a minimum output capacitance of just 1-µF for stability.

The LP38798 features output noise of 5 uVrms provides a clean supply for noise-sensitive applications. PSRR of 90 dB at 10 kHz keeps a noisy supply from reaching target application. Wide operating input voltage range of 3 V to 20 V. Very small 4.0-mm by 4.0-mm by 0.8-mm WSON package allows for placement very close to target application.

The LP5907 and LP39798 LDOs are available in volume now from TI and its authorized distributors. Offered in 5-pin SOT-23, 4-pin micro SMD and 4-pin DSBGA packages, the LP5907 is priced at US $0.23 in 1,000-unit quantities. The LP39798 is offered in a 12-pin WSON package with thermal pad and is price at US $1.30.

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