|
S-8533A125FT-TB-X Datasheet, PDF (1/33 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER | |||
|
S-8533 Series
STEP-DOWN, SYNCHRONOUS PWM CONTROL
www.sii-ic.com
SWITCHING REGULATOR CONTROLLER
© SII Semiconductor Corporation, 2002-2010
Rev.3.0_01
The S-8533 Series is a synchronous PWM control CMOS step-down switching regulator controller that includes a reference
voltage source, synchronous circuit, oscillation circuit, error amplifier, phase compensation circuit, and PWM controller.
An efficient step-down switching regulator can be realized simply by adding external P-channel and N-channel power MOS
FETs, one coil, and three capacitors.
Since the oscillation frequency is a high 300 kHz, the S-8533 can be used to configure a high efficiency step-down switching
regulator capable of driving high output current using small external parts and a 3 to 10% increase in efficiency is obtained
compared to conventional step-down switching regulators.
The 8-Pin TSSOP package and high oscillation frequency make the S-8533 ideal as the main power supply for portable
devices.
ï® Features
⢠Synchronous rectification system realizing high efficiency (typ. 94%)
⢠Use at maximum duty ratio = 100% and use of a battery up to maximum life is possible by using P-channel and N-
channel power MOS FETs externally.
⢠Oscillation frequency : 300 kHz typ.
⢠Input voltage :
2.7 to 16.0 V
⢠Output voltage :
1.25 V
1.3 to 6.0 V, selectable in 0.1 V steps
⢠Output voltage accuracy : ±2.0%
⢠Soft-start function set by an external capacitor (CSS)
⢠Shutdown function
⢠Lead-free, Sn 100%, halogen-free*1
*1. Refer to âï® Product Name Structureâ for details.
ï® Applications
⢠Constant voltage power supply for hard disks and DVD drivers
⢠Power supplies for portable devices, such as digital cameras, PDAs, electronic organizers, and cellular phones
⢠Main or sub power supply for notebook PCs and peripherals
⢠Constant voltage power supply for cameras, video equipment, and communication equipment
ï® Package
⢠8-Pin TSSOP
1
|
▷ |