S-8541 Seiko Instruments, S-8541 Datasheet

S-8541

Manufacturer Part Number

S-8541

Description

(S-8540 / S-8541) 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

Manufacturer

Seiko Instruments

Datasheet

1.S-8541.pdf (36 pages)

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Rev.3.2

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

SWITCHING REGULATOR CONTROLLER

Features

Applications

Package

• 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.

8-Pin MSOP

• Oscillation frequency

• Output voltage

• Output voltage precision

• Feed back type for output voltage (FB)

• External components:

• Built-in PWM/PFM switchover control

• Current limit circuit

• Soft-start

• Shutdown function

• Small package

• Lead-free products

Package Name

circuit (S-8541 series)

_00

FN008-A

Package

Seiko Instruments Inc.

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

±2.0%

a transistor, a coil, a diode, and capacitors

Duty ratio:

Current is set by an external resistor R

Time is set by a capacitor C

8-Pin MSOP

600 kHz (A, B types)

300 kHz (C, D types)

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.

29% (PFM control)

29 to 100% (PWM control)

Drawing Code

FN008-A

Tape

and a resistor R

S-8540/8541 Series

SENSE

FN008-A

Reel

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