S-8550 - (S-8550 / S-8551) PWM CONTROL SWITCHING REGULATORS

Description

Pin No.

Features

s.
Oscillation frequency : 1.2 MHz.
Input voltage range : 2.0 to 5.5 V.
Output voltage range : Arbitrarily settable by external output voltage setting resistor.
Output current : 600 mA.
Reference voltage : 0.6 V ±2.0%.
Efficiency : 92%.
Soft-start function : 1 ms typ.
Shutdown function : Shutdown current consumption : 1.0 µA max.
Built-in current limit circuit.
Pch power MOS FET on-resistance : 0.4 Ω typ.

Seiko Instruments

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Datasheet Details

Part number	S-8550
Manufacturer	Seiko Instruments
File Size	476.54 KB
Description	(S-8550 / S-8551) PWM CONTROL SWITCHING REGULATORS
Datasheet	S-8550 Datasheet
Additional preview pages of the S-8550 datasheet.

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Full PDF Text Transcription

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Rev.2.1_01 www.DataSheet4U.com STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS S-8550/8551 Series The S-8550/8551 Series is a CMOS synchronous rectification step-down switching regulator which mainly consists of a reference voltage circuit, an oscillator, an error amplifier, a phase compensation circuit, a PWM controller, an under voltage lockout circuit (UVLO), a current limit circuit, and a power MOS FET. The oscillation frequency is high at 1.2 MHz, so a high efficiency, large output current, step-down switching regulator can be achieved by using small external parts. The built-in synchronous rectification circuit makes achieving high efficiency easier compared with conventional step-down switching regulators.

Published: Aug 28, 2009 |