S-8352 Datasheet | Seiko Instruments

Rev.2.0_00 STEP-UP, SUPER-SMALL PACKAGE, PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER S-8351/8352 Series The S-8351/8352 Series is a CMOS step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, a parator and PFM control circuit. The PFM control circuit allows the duty ratio to be automatically switched according to the load (at light load : 50%, at high output current : 75%), enabling products with a low ripple over a wide range, high efficiency, and high output current (A, B, and D type). Products with a fixed duty ratio of 75% are also available (C type). The S-8351 Series can configure a step-up switching regulator with an external coil, capacitor, and diode. A protection circuit turns off the built-in MOS FET when the voltage at the CONT pin exceeds the limit to prevent it from being damaged. In addition to the above Features , the small package and low current consumption, makes the S-8351 Series ideal for applications such as the power supply unit of portable equipment. The S-8352 Series, which Features an external transistor, is suitable for applications requiring a high output current. - Features - Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed - Low current consumption : During operation 23.2 µA (VOUT = 3.3 V, typ.) During shutdown 0.5 µA (max.) - Duty ratio : 50 % / 75 % built-in auto-switching-type PFM control circuit (A, B, and D type) 75 % built-in fixed-type PFM control circuit (C type) - External parts : Coil, capacitor, and diode - Output voltage : Selectable in 0.1 V steps between 2.0 to 6.5 V (A, B, and C type) Selectable in 0.1 V steps between 1.5 to 6.5 V (D type) - Output voltage accuracy : ±2.4% - Shutdown function (A type) - VDD / VOUT...