REGULATOR CONTROLLER. S-8533 Datasheet

S-8533 CONTROLLER. Datasheet pdf. Equivalent

Part S-8533
Description SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Feature Rev.2.3_00 www.DataSheet4U.com STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER S.
Manufacture Seiko Instruments
Datasheet
Download S-8533 Datasheet




S-8533
www.DaRtaeSvhe.e2t4.3U_.c0o0m
STEP-DOWN, SYNCHRONOUS PWM CONTROL
SWITCHING REGULATOR CONTROLLER
S-8533 Series
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
Small package :
8-Pin TSSOP
Lead-free products
„ 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
Package Name
8-Pin TSSOP
Package
FT008-A
Drawing Code
Tape
FT008-E
Reel
FT008-E
Seiko Instruments Inc.
1



S-8533
www.DaStaTSEhePet-4DU.OcoWm N, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8533 Series
Rev.2.3_00
„ 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 Seiko Instruments Inc.







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