Datasheet > S-8541C32FN-IIRT2G

S-8541C32FN-IIRT2G

更新时间： 2024-11-06 02:56:47

品牌	Logo	应用领域
精工 - SII		开关光电二极管 ISM频段
页数	文件大小	规格书
36页	445K
描述
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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Rev.3.2_00

STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE

SWITCHING REGULATOR CONTROLLER

S-8540/8541 Series

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

600 kHz (A, B types)

300 kHz (C, D types)

• Oscillation frequency

1.5 to 6.0 V, selectable in 0.1V steps (A, C types)

• Output voltage

• Output voltage precision

• Feed back type for output voltage (FB)

• External components:

• Built-in PWM/PFM switchover control

circuit (S-8541 series)

• Current limit circuit

±2.0%

a transistor, a coil, a diode, and capacitors

Duty ratio: 29% (PFM control)

29 to 100% (PWM control)

Current is set by an external resistor R_SENSE

Time is set by a capacitor C_SSand a resistor R_SS.

• Soft-start

• 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

Tape

Package

FN008-A

Reel

FN008-A

8-Pin MSOP

Seiko Instruments Inc.

12 3 4 5 6 7...36

中文翻译

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S-8541C32FN-IIRT2z	SII	获取价格	STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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S-8541C33FN-IIST2z	SII	获取价格	STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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S-8541C60FN-IGST2G	SII	获取价格	SWITCHABLE SWITCHING REGULATOR CONTROLLER
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