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データシート SY8120B PDF ダウンロード


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部品番号 SY8120B
部品説明 Synchronous Step Down Regulator
メーカ Silergy
ロゴ Silergy ロゴ 
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SY8120B Datasheet, SY8120B PDF,ピン配置, 機能
昱灿电子 www.szyucan.com 
Application Note: AN_SY8120B
High Efficiency Fast Response, 2A, 18V Input
Synchronous Step Down Regulator
General Description
SY8120B develops high efficiency synchronous step-
down DC-DC converter capable of delivering 2A load
current . SY8120B operates over a wide input voltage
range from 4.5V to 18V and integrates main switch and
synchronous switch with very low RDS(ON) to minimize
the conduction loss.
SY8120B adopts the instant PWM architecture to
achieve fast transient responses for high step down
applications and high efficiency at light loads. In
addition, it operates under heavy load conditions to
minimize the size of inductor and capacitor.
Ordering Information
SY8120 ( )
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY8120BABC
SOT23-6
--
Features
Low RDS(ON) for internal switches
(top/bottom):145/135 m
4.5-18V input voltage range
2A load current capability
Instant PWM architecture to achieve fast transient
responses Internal softstart limits the inrush current
2% 0.6V reference
RoHS Compliant and Halogen Free
Compact package: SOT23-6
Applications
Set Top Box
Portable TV
Access Point Router
DSL Modem
LCD TV
Typical Applications
Figure 1. Schematic Diagram
AN_SY8120B Rev.0.2
Figure 2. Efficiency Figure
1

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SY8120B pdf, 電子部品, 半導体, ピン配列
昱灿电子 www.szyucan.com 
AN_SY8120B
Electrical Characteristics
(VIN = 12V, VOUT = 1.2V, L = 2.2uH, COUT = 10uF, TA = 25°C, IOUT = 1A unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Feedback Reference
Voltage
FB Input Current
Top FET RON
Bottom FET RON
Bottom FET Valley
Current Limit
EN Rising Threshold
EN Falling Threshold
Input UVLO Threshold
On Time
Min ON Time
Min Off Time
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Symbol
VIN
IQ
ISHDN
VREF
IFB
RDS(ON)1
RDS(ON)2
ILIM
VENH
VENL
VUVLO
TON
TSD
THYS
Test Conditions
IOUT=0, VFB=VREF×105%
EN=0
VFB=VIN
VIN = 12V ,VOUT=1.2V, IOUT = 1A
Min
4.5
0.588
Typ
400
5
0.6
Max
18
10
0.612
Unit
V
µA
µA
V
-50 50
0.145
0.135
nA
2A
1.5 V
0.4 V
4.5 V
200 ns
50 ns
100 ns
150 °C
15 °C
Note 1: Stresses listed as the above Absolute Maximum Ratingsmay cause permanent damage to the device.
These are for stress ratings. Functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may remain possibility to affect device reliability.
Note 2: JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal
conductivity test board of JEDEC 51-3 thermal measurement standard. Pin 2 of SOT-23-6 packages is the case
position for JC measurement.
Note 3: The device is not guaranteed to function outside its operating conditions.
AN_SY8120B Rev.0.2
3





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