Epson Develops Ultra-Compact, Low-Power CMOS Regulator IC with World's Smallest WCSP 4-Pin Package

- TOKYO, Japan, June 13, 2007 -

Seiko Epson Corp. ("Epson") has succeeded in developing the S1F78B17 positive voltage CMOS regulator IC, which boasts the smallest WCSP 4-pin package size in the world ^*1 (0.92 mm x 0.92 mm) and low current consumption of only 30 µA ^*2 . Epson plans to release samples of this product in August 2007 and launch volume shipments in November 2007.

The S1F78B17 model comes equipped with features such as standard voltage supply, output voltage setting resistance, overcurrent protector, output voltage drop compensator, phase compensator, chip enable buffer, and pulse response function. When installed in devices, this product makes it possible to provide functions such as low output noise, fast transient response, and high load stabilization at a high degree of precision. In addition to the ultra-compact WCSP 4-pin package, Epson will also offer a compact SOT-23 5-pin package which will be ideal for use in cellular phones, battery-powered devices, and other devices that require high-density packaging.

S1F78B17 features

Low current consumption	30 µA during no-load operation (typical), 0.1µA during standby (maximum)
Output voltage	DC 1.5 V-4.0 V (can be set in 0.1 V steps)
Output current	150 mA (VDD=VOUT(S)+1.0 V)
Overcurrent protector	Included
Discharge function	Included
Ultra-compact package	WCSP 4-pin (0.92 mm x 0.92 mm), SOT-23 5-pin (2.9 mm x 1.6 mm)

Notes

*1 Refers to items installed using solder balls, according to Epson's research.
*2 Refers to the standard rate during no-load operation, according to Epson's research.