Ultra-low noise, high PSRR linear voltage regulators reduce jitter, simplify power design
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.
The LP5907 generates an output noise of less than 10-uVrms to provide a clean supply for noise-sensitive applications. A PSRR of 75 dB at 1 kHz keeps a noisy supply from reaching target application. The output voltage range is between 1.2 V and 4.5 V in 25 mV steps enables a variety of designs. The 0.65-mm by 0.65-mm by 0.40-mm micro SMD package allows placement 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 delivers an output noise of 5 uVrms. The device’s PSRR of 90 dB at 10 kHz keeps a noisy supply from reaching target application. The LP38798 has a wide operating input voltage range of 3 V to 20 V. The device’s 4.0-mm by 4.0-mm by 0.8-mm WSON package allows for placement close to target application.
Availability and Pricing
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 $0.23 in 1,000-unit quantities. The LP39798 is offered in a 12-pin WSON package with thermal pad and is price at $1.30.
More information about the LP5907 and LP39798 LDOs at
www.ti.com/lp5907-pr and www.ti.com/lp38798-pr
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