Details, datasheet, quote on part number: S-8520AXXMC
PartS-8520AXXMC
CategoryPower Management => Regulators => Switching Regulators
DescriptionControl Method = Pwm, Pwm/pfm ;; Operation Start Voltage = (Input 2.5 to 10/16 V) ;; Output Voltage = 1.5-6.0V ;; Output Accuracy = ±2.4% ;; Switching Frequency = 60, 180, 300 KHZ ;; Current Consumption Operating = 60 µA (180KHz) 21 µA (60KHz) 100 µA (300KHz) ;; Current Consumption Shutdown = 0.5 µA Max. ;; Efficiency Typ. = 93% ;; Package = SOT-23-5
CompanySeiko Instruments
DatasheetDownload S-8520AXXMC datasheet
  

 

Features, Applications

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

The S-8520/8521 Series consists of CMOS step-down switching regulatorcontrollers with PWM-control (S-8520) and PWM/PFM-switched control (S8521). 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 ideal when operating via an AC adapter.

On-board power supplies of battery devices for Low current consumption: portable telephones, electronic notebooks, PDAs, In operation: 60 ľA max. & B Series) and the like. 21 ľA max. & D Series) Power supplies for audio equipment, including 100 ľA max. & F Series) portable CD players and headphone stereo When powered off: 0.5 ľA max. equipment. Input voltage: Fixed voltage power supply for cameras, video 16 V (B, D, F Series) equipment and communications equipment. 10 V (A, C, E Series) Power supplies for microcomputers. Output voltage: Conversion from four NiH or NiCd cells or two Selectable between 1.5 V and lithium-ion cells 0.1 V step Conversion of AC adapter input 5 V/3 V. Duty ratio: 100 % PWM control 100 % PWM/PFM-switched control (S-8521) 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). Oscillation frequency: 180 kHz typ. & B Series), 60 kHz typ. & D Series), or 300 kHz typ. (E, F Series). Soft-start function: 8 ms. typ. & B Series) 12 ms. typ.(C & D Series), or 4.5 ms. typ. (E, F Series). With a power-off function. With a built-in overload protection circuit. Overload detection time: 4 ms. typ. (A Series), 14 ms. typ. (C Series) or 2.6 ms. typ.(E Series).

PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers S-8520/8521 Series Rev.7.4_10 Block Diagram:

Reference Voltage Source with Soft Start

. 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: Oscillati on 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. F: Oscillation frequency of 300 kHz, without overload protection circuit.

PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers Rev.7.4_10 S-8520/8521 Series

2. Product List (As of September & B Series (Oscillation Frequency of 180 kHz)

Item Output Voltage (V) S-8520AXXMC Series S-8520A50MC-AWJ-T2 S-8521AXXMC Series S-8521A50MC-AYJ-T2 S-8520BXXMC Series S-8521BXXMC Series

Item Output Voltage (V) S-8520CXXMC Series S-8520C50MC-BSJ-T2 S-8521CXXMC Series S-8521C50MC-BUJ-T2 S-8520DXXMC Series S-8520D50MC-BWJ-T2 S-8521DXXMC Series S-8521D36MC-BXV-T2 S-8521D50MC-BYJ-T2

Item Output Voltage (V) S-8520EXXMC Series S-8520E50MC-BKJ-T2 S-8521EXXMC Series S-8521E50MC-BMJ-T2 S-8520FXXMC Series S-8520F50MC-BOJ-T2 S-8521FXXMC Series S-8521F33MC-BPS-T2 S-8521F50MC-BQJ-T2

For the availability of product samples listed above, contact the SII Sales Department.

 

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