Seiko Instruments S-8541
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.| Part No. | S-8541 |
|---|---|
| Datasheet | S-8541 Download |
| Manufacturer |  Seiko Instruments |
| Description | 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER |
| Buy | Stock & Price |
FEATURES
● Oscillation frequency● 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
● Soft-start
● Shutdown function
● Small package
● Lead-free products 600 kHz (A, B types) 300 kHz (C, D types) 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: 29% (PFM control) 29 to 100% (PWM control) Current is set by an external resistor RSENSE. Time is set by a capacitor CSS and a resistor RSS. 8-Pin MSOP
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 8-Pin MSOP Package FN008-A Drawing Code Tape FN008-A Reel FN008-A Seiko Instruments Inc. 1 STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.3.2_00 S-8540/8541 Series Block Diagrams 1.
