S-8351 Datasheet (Seiko Instruments) - SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

S-8351, SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

Output voltage pin and IC power supply pin GND pin External inductor connection pin (Open-drain output) 2 Figure 7 3 Table 7 S-8352 Series B and C Types (Without shutdown function, VDD / VOUT non-separate type) Pin No.

1 2 3 Symbol VOUT VSS EXT Pin Description Output voltage pin and IC power supp

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 comparator 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

S-8351 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

* Lo