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S-8540A18FN-IADT2G Datasheet(PDF) 1 Page - Seiko Instruments Inc |
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S-8540A18FN-IADT2G Datasheet(HTML) 1 Page - Seiko Instruments Inc |
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1 / 36 page  Rev.3.2_00 STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8540/8541 Series Seiko Instruments Inc. 1 The S-8540/8541 Series is a family of CMOS step- down switching regulator controllers with PWM control (S-8540 Series) and PWM/PFM switchover control (S- 8541 Series). These devices consist of a reference voltage source, oscillation circuit, an error amplifier, phase compensation circuit, PWM control circuit, current limit circuit. A high efficiency and large current switching regulator is realized with the help of small external components due to the high oscillation frequency, 300 kHz and 600 kHz. The S-8540 Series provides low-ripple voltage, high efficiency, and excellent transient characteristics which come from the PMW control circuit capable of varying the duty ratio linearly from 0 to 100%, the optimized error amplifier, and the phase compensation circuit. The S-8541 Series operates under PWM control when the duty ratio is 29% or higher and operates under PFM control when the duty ratio is less than 29% to ensure high efficiency over all load range. These controllers serve as ideal main power supply units for portable devices due to the high oscillation frequencies together with the small 8-Pin MSOP package. Features • Oscillation frequency 600 kHz (A, B types) 300 kHz (C, D types) • Output voltage 1.5 to 6.0 V, selectable in 0.1V steps (A, C types) • Output voltage precision ±2.0% • Feed back type for output voltage (FB) • External components: a transistor, a coil, a diode, and capacitors • Built-in PWM/PFM switchover control circuit (S-8541 series) Duty ratio: 29% (PFM control) 29 to 100% (PWM control) • Current limit circuit Current is set by an external resistor RSENSE. • Soft-start Time is set by a capacitor CSS and a resistor RSS. • Shutdown function • Small package 8-Pin MSOP • Lead-free products Applications • Power supplies for PDAs, electric organizers, and portable devices. • Power supplies for audio equipment such as portable CD players and headphone stereos. • Main or sub Power supplies for notebook computers and peripheral equipment. Package Package Name Drawing Code Package Tape Reel 8-Pin MSOP FN008-A FN008-A FN008-A |
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