LDO Voltage Regulator has high ripple rejection ratio.

Press Release Summary:




S-L2980 low noise LDO voltage regulator has ripple rejection ratio of 70 dB at 1 kHz and low quiescent current of 0.1 pA, making it suitable for use in wireless RF devices, cell phones, PDAs, MP3 players and other portable electronic equipment. Output voltage range is 1.5 to 6.0 V at 0.1 V increments. It has low dropout voltage of 120 mV at 50 mA, output voltage accuracy of 2.0%, peak current of 150 mA, and built-in power-off circuit.




Original Press Release:



Seiko Introduces LDO Voltage Regulators With High Ripple Rejection Ratio



Torrance, CA, October 31, 2001. Seiko instruments announces a series of low current LDO voltage regulators with high ripple rejection ratio. The high ripple rejection ratio makes the S-L2980 a series of low noise LDO voltage regulators, which makes it perfect for use in wireless RF devices and cell phones. The low quiescent current of 0.1 pA (1 pA max at power off) makes it ideal for PDAs, MP3 players and other portable electronic equipment.

It is known that LDO voltage regulators need an output capacitor. But, the S-L2980 was designed for use with ceramic capacitors, although tantalum and electrolytic capacitors can also be used. Some of the benefits of a ceramic versus a tantalum capacitor include smaller size, better safety (tantalum can burn, ceramic won't), lower ESR (equivalent serial resistance), and lower cost. The S-L2980 Series has an output voltage range of 1.5 V to 6.0 V at 0.1 V increments. Other features of the S-L2980 include a low dropout voltage of 120 mV at 50 mA for a 3.0 V output; output voltage accuracy of± 2.0%; high peak current capability of 150 mA at V1, > V0,,(S) + 1 V; a ripple rejection ratio of 70 dB at 1 kHz; and a built-in power-off circuit. The S-L2980 comes in the 5-pin SON(A) [2.0 L x 2.1 W x 0.85 H (mm)] or the SOT-23-5 [2.9 L x 2.8 W x 1.3 H (mm)] packages.

Pricing begins at $0.34 and $0.30 in quantities of 10K for the SON(A) packaging and SOT-23-5 packaging, respectively. The S-L2980 is available now through a national network of authorized distributors, including All American, Mouser and Future Electronics.

ABOUT SEIKO
Seiko Instruments' semiconductor technology originated with the integrated circuits used in Seiko watches. This application demands ultra-low power consumption coupled with precision performance, high processing accuracy and top quality. Seiko Instruments has adapted this basic CMOS technology to create a line of standard products for energy management. These ICs feature the lowest current consumption available to give the longest battery life, or the most energy efficient operation for line operated equipment.

Seiko Instruments is totally committed to providing the highest quality semiconductors to enhance the value of its customers' end products. Seiko Instruments' IC products include: Switching Regulators, Voltage Detectors, Mini Logic ASSPs, Low DropOut (LDO) Voltage Regulators, Timer ASSPs, Sensors and Low Voltage E2PROMs.

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