SWITCHING REGULATORS. S-8550 Datasheet

S-8550 REGULATORS. Datasheet pdf. Equivalent

Part S-8550
Description (S-8550 / S-8551) PWM CONTROL SWITCHING REGULATORS
Feature Rev.2.1_01 www.DataSheet4U.com STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWIT.
Manufacture Seiko Instruments
Datasheet
Download S-8550 Datasheet




S-8550
www.DaRtaeSvhe.e2t.41U_.c0o1m
STEP-DOWN, BUILT-IN FET, SYNCHRONOUS
RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
The S-8550/8551 Series is a CMOS synchronous rectification step-down
switching regulator which mainly consists of a reference voltage circuit, an
oscillator, an error amplifier, a phase compensation circuit, a PWM controller, an
under voltage lockout circuit (UVLO), a current limit circuit, and a power MOS
FET. The oscillation frequency is high at 1.2 MHz, so a high efficiency, large
output current, step-down switching regulator can be achieved by using small
external parts.
The built-in synchronous rectification circuit makes achieving high efficiency
easier compared with conventional step-down switching regulators. A ceramic
capacitor can be used as an output capacitor. High-density mounting is
supported by adopting a small SOT-23-5 package.
The S-8550 and S-8551 Series are offered according to different pin configuration.
„ Features
Oscillation frequency :
1.2 MHz
Input voltage range :
2.0 to 5.5 V
Output voltage range :
Arbitrarily settable by external output voltage setting resistor
Output current :
600 mA
Reference voltage :
0.6 V ±2.0%
Efficiency :
92%
Soft-start function :
1 ms typ.
Shutdown function :
Shutdown current consumption : 1.0 µA max.
Built-in current limit circuit
Pch power MOS FET on-resistance :
0.4 typ.
Nch power MOS FET on-resistance :
0.3 typ.
Constant continuous mode operation (no light load mode)
Small package :
SOT-23-5
Lead-free products
„ Applications
Mobile devices, such as mobile phones, Bluetooth devices, wireless devices, digital audio players, digital still
cameras, portable DVD players, and portable CD players
„ Package
Package Name
SOT-23-5
Package
MP005-A
Drawing Code
Tape
MP005-A
Reel
MP005-A
Seiko Instruments Inc.
1



S-8550
www.DaStaTSEhPe-eDt4OUW.coNm, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550/8551 Series
Rev.2.1_01
„ Block Diagram
FB
VIN CIN
Error amplifier
Current limit
circuit
IC internal
power supply
+
Reference
voltage
+ PWM control
circuit
PWM comparator
Triangular wave
generation
circuit
ON/OFF
circuit
UVLO
circuit
VIN
*1
CONT
L
*1 CFB
VOUT
RFB1
COUT
RFB2
*1. Parasitic diode
ON/OFF
Figure 1
VSS
2 Seiko Instruments Inc.







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