Details, datasheet, quote on part number: S-8520/8521Series
PartS-8520/8521Series
CategoryPower Management => Regulators => Switching Regulators
Description
CompanySeiko Instruments USA, Inc.
DatasheetDownload S-8520/8521Series datasheet
  

 

Features, Applications

Features........................................................... Applications..................................................... Block Diagram................................................. Selection Guide................................................ Pin Assignment................................................ Absolute Maximum Ratings.............................. Electrical Characteristics.................................. Measurement Circuits...................................... Operation......................................................... Selection of Series Products and Associated External Components........

Standard Circuits.............................................. 12 Precautions...................................................... 12 Application Circuits.......................................... 13 Outlines and Dimensions.................................. 15 Marking............................................................ 15 Taping.............................................................. 15 Characteristics of Major Items.......................... 17 Transient Response Characteristics................. 19 Reference Data................................................ 23 Frequently Asked Questions............................ 26

PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers

The S-8520/8521 Series consists of CMOS step-down switching regulator-controllers with PWMcontrol (S-8520) and PWM/PFM-switched control (S-8521). These devices contain a reference voltage source, oscillation circuit, error amplifier, and other components. The S-8520 Series provides low-ripple power, high-efficiency, and excellent transient characteristics thanks to a PWM control circuit capable of varying the duty ratio linearly from to 100%. The series also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. The S-8521 Series works with either PWM control or PFM control, and can switch from one to the other. It normally operates using PWM control with a duty ratio to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. This series ensures high efficiency over a wide range of conditions, from standby mode to operation of peripheral equipment. With the addition of an external Pch Power MOS FET or PNP transistor, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOT-23-5 minipackage, providing such outstanding features as low current consumption. Since this series can accommodate an input voltage it is also suitable when operating via an AC adapter.

Y On-board power supplies of battery devices for portable telephones, Y Low current consumption: electronic notebooks, PDAs, and the like. In operation: 60 mA max. & B Series) Y Power supplies for audio equipment, including portable CD players 21 mA max. & D Series) and headphone stereo equipment. When powered off: 0.5 mA max. Y Fixed voltage power supply for cameras, video equipment and Y Input voltage: communications equipment. & D Series) Y Power supplies for microcomputers. & C Series) Y Conversion from four NiH or NiCd cells or two lithium-ion cells to Y Output voltage: 3.3V/3V. Selectable between 1.5V and 6.0V in steps 0.1V. Y Conversion of AC adapter input 5V/3V. Y Duty ratio: to 100% PWM control to 100% PWM/PFM-switched control (S-8521) Y The only peripheral components that can be used with this IC are a Pch power MOS FET or PNP transistor, a coil, a diode, and capacitors. (If a PNP transistor is used, a base resistance and a capacitor will also be required.) Y Oscillation frequency: 180 kHz type. & B Series), 60 kHz type. & D Series), or 300 kHz type. (version under development). Y Soft-start function: 8 msec type. & B Series) or 12 msec type & D Series). Y With power-off function. Y With a built-in overload protection circuit. Overload detection time: 4 msec type. (A Series) or 14 msec type. (C Series).

Reference Voltage Source with Soft Start
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series

Tape specifications. Product name abbreviation. Package name abbreviation. Output voltage x 10 Product type:

A: Oscillation frequency of 180 kHz, with overload protection circuit. B: Oscillation frequency of 180 kHz, without overload protection circuit. C: Oscillation frequency of 60 kHz, with overload protection circuit. D: Oscillation frequency of 60 kHz, without overload protection circuit. E: Oscillation frequency of 300 kHz, with overload protection circuit (currently under development). F: Oscillation frequency of 300 kHz, without overload protection circuit (currently under development).

2. Product List (As of Mar. & B Series (Oscillation Frequency of 180 kHz) Item Output Voltage (V)
& D Series (Oscillation Frequency of 60 kHz) Item Output Voltage (V)

Product samples of the different versions of the series listed above are currently being prepared. Please contact the SII Sales Department regarding the availability of samples. Also contact SII Sales Department if you desire an output voltage other than those noted above.


 

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