Details, datasheet, quote on part number: S-8321/8322Series
PartS-8321/8322Series
CategoryPower Management => Regulators => Switching Regulators
Description
CompanySeiko Instruments USA, Inc.
DatasheetDownload S-8321/8322Series datasheet
  

 

Features, Applications

Features.............................................................. 1 Applications......................................................... 1 Block Diagram..................................................... 1 Selection Guide................................................... 2 Pin Assignment................................................... 2 Absolute Maximum Ratings................................. 2 Electrical Characteristics..................................... 3 Test Circuits........................................................ 7 Operation............................................................. 8 External Part Selection........................................ 11 Standard Circuits................................................. 13 Precautions......................................................... 13 Dimensions.......................................................... 14 Markings.............................................................. 14 Taping................................................................. 15 Characteristics (typical data)............................... 17 Reference Data (1).............................................. 19 Reference Data (2).............................................. 22 Frequently Asked Questions............................... 28

SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR

The S-8321/8322 Series is a CMOS PFM-control step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, a power MOS FET, and a comparator. The new method PFM control circuit automatically switches the duty ratio according to load, offering products of low ripple over a wide range, high efficiency, high output current. A step-up switching regulator is constructed by externally connecting only a coil, a capacitor and a diode to the S-8321/8322 Series. This feature, along with its small package and low current consumption, makes the S-8321/8322 Series ideal for the power supply of portable equipment. A built-in protection circuit prevents damage to the IC by turning off the MOS FET when the voltage at CONT pin exceeds the limit during ON of the built-in MOS FET. For applications requiring a high output current, products used with an external transistor are also available in S-8322 Series.

Features

Low voltage operation: 0.9 V min. (IOUT = 1 mA) Low input current: During operation: 6.8 A (VOUT V, no load, typ.) During shutdown: 0.5 A (max.) Duty ratio: auto-switching PFM control circuit type External parts: coil, diode, and capacitor only Output voltage: accuracy of 2.4% Shutdown function External transistor type is available (S-8322 Series) A Series : SOT-23-5 package B Series : SOT-23-3 package

Applications

Power supplies for portable equipment such as pagers, handy calculators, and remote controllers Constant voltage power supplies for cameras, video equipment, and communications equipment Power supply for microcomputers

SMALL PACKAGE PFM CONTROL STEP-UP SWITCHING REGULATOR S-8321/8322 Series

Tape Specification Product name (abbreviation) Output voltage (symbol) Series name SOT-23-5 / auto-switching type SOT-23-3 / auto-switching type Power MOS FET 1 : Built 2 : Connected externally 2. List of the Product Products Output voltage (V) S-8321A Series S-8322A Series S-8321B Series S-8322B Series

5.5 S-8321AMMP-DNM-T2 Consult our sales person for products with an output voltage other than specified above.

Shutdown pin ON / OFF "H": normal operation (stepping up operation) "L": stop stepping up (circuit stop) VOUT VSS Output voltage pin and IC power supply GND External inductor connection Note 1 External transistor connection Note 2

Note 1: S-8321 Series : Open drain output Note 2: S-8322 Series: CMOS output Figure 2

( Unless otherwise specified: Ta=25C ) Parameter VOUT pin voltage ON/OFF pin voltage CONT pin voltage CONT pin current EXT pin voltage EXT pin current Power dissipation Operating temperature Storage temperature Symbol VOUT ON/OFF VCONT ICONT VEXT IEXT PD TOPR TSTG Ratings to VOUT+0.3


 

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