REGULATOR CONTROLLER. S-8533 Datasheet

S-8533 CONTROLLER. Datasheet pdf. Equivalent

Part S-8533
Description SWITCHING REGULATOR CONTROLLER
Feature S-8533 Series www.ablicinc.com © ABLIC Inc., 2002-2010 STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHIN.
Manufacture ABLIC
Datasheet
Download S-8533 Datasheet

Rev.2.3_00 www.DataSheet4U.com STEP-DOWN, SYNCHRONOUS PWM C S-8533 Datasheet
S-8533 Series www.ablicinc.com © ABLIC Inc., 2002-2010 STE S-8533 Datasheet
Recommendation Recommendation Datasheet S-8533 Datasheet





S-8533
S-8533 Series
www.ablicinc.com
© ABLIC Inc., 2002-2010
STEP-DOWN, SYNCHRONOUS PWM CONTROL
SWITCHING REGULATOR CONTROLLER
Rev.3.0_02
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.
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 “Product Name Structure” for details.
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
Package
8-Pin TSSOP
1



S-8533
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8533 Series
Rev.3.0_02
Block Diagram
Tr
VIN
Oscillation
circuit
L
VIN CIN
PDRV
NDRV
Tr
CSS CSS
PWM control circuit
P.N feed-through
prevention circuit
Reference voltage
source with soft start
Remark All the diodes in the figure are parasitic diodes.
Figure 1
ON / OFF
VOUT
COUT
VSS
2





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