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SY8208A PDF 데이터시트 ( Data , Function )

부품번호 SY8208A 기능
기능 Synchronous Step Down Regulator
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SY8208A 데이터시트, 핀배열, 회로
昱灿电子 www.szyucan.com 
Application Notes: AN_SY8208A
High Efficiency Fast Response
8A Continuous, 16A Peak, 28V Input
Synchronous Step Down Regulator
General Description
The SY8208A develops a high efficiency synchronous
step-down DC-DC regulator capable of delivering 8A
continuous, 16A peak current. The SY8208A operates
over a wide input voltage range from 4V to 28V and
integrates main switch and synchronous switch with
very low RDS(ON) to minimize the conduction loss.
The SY8208A 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 at pseudo-constant frequency of
800kHz under continuous conduction mode to
minimize the size of inductor and capacitor.
Ordering Information
SY8208 (□□)
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY8208AQNC QFN3x3-10
--
Typical Applications
Features
Low RDS(ON) for internal switches (top/bottom):
20/10 mΩ
Wide input voltage range: 4-28V
Instant PWM architecture to achieve fast transient
responses
Internal 400uS softstart limits the inrush current
Pseudo-constant frequency: 800kHz.
8A continuous/16A peak output current capability
±1.5% 0.6V reference
Programmable peak current limit
Power good indicator
Output discharge function
Short circuit latch off protection
Over voltage latch off protection
Input UVLO
Over temperature protection
RoHS Compliant and Halogen Free
Compact package: QFN3x3-10
Applications
LCD-TV/Net-TV/3DTV
Set Top Box
Notebook
High Power AP
VIN
CIN
10uF
High/Floating/Low
ON/OFF
CVCC
2.2uF
IN
GND
ILMT
EN
VCC
PG
BS
LX
FB
PG (Open Drain Output)
CBS
100nF
L 1.5uH
C1
220pF
VOUT=3.3V
R1
100k
COUT
22uF×3
R2
22.1k
Figure 1 Schematic
Figure 2. Efficiency
AN_SY8208A
1




SY8208A pdf, 반도체, 판매, 대치품
昱灿电子 www.szyucan.com 
AN_SY8208A
Electrical Characteristics
(VIN = 12V, VOUT =5V, COUT = 100uF, TA = 25°C, IOUT = 2A unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Input Voltage Range
Quiescent Current
Shutdown Current
Feedback Reference
Voltage
VIN
IQ
ISHDN
VREF
IOUT=0,
VFB=VREF*105%
EN=0
4.0
0.591
3
0.6
28 V
100 µA
10 µA
0.609 V
FB Input Current
Top FET RON
IFB
Rds(on)1
VFB=4V
-50
20
50 nA
mΩ
Bottom FET RON
Rds(on)2
10 mΩ
Discharge FET RON
Rdis
50 Ω
Bottom FET Current
Limit
ILIM
ILMT=’0’
ILMT=Floating
8
12
A
ILMT=’1’
16
ILMT Rising Threshold
ILMT Falling Threshold
Soft Start Time
EN Rising Threshold
EN Falling Threshold
Input UVLO Threshold
UVLO hysteresis
Oscillator Frequency
Min ON Time
Min OFF Time
VCC Output
Output Over Voltage
Threshold
VILMTH
VILMTL
TSS
VENH
VENL
VUVLO
VHYS
FOSC
TON,MIN
TOFF,MIN
VCC
Vo=5V
VIN=VINMAX
VIN=4V
VFB Rising
Vcc-0.8
400
0.8
0.3
0.68 0.8
50
80
3.2 3.3
115 120
VCC V
0.8 V
µS
V
0.4 V
3.9 V
V
0.92 MHz
ns
ns
3.4 V
125 %VREF
Output Over Voltage
Hysteresis
2 %VREF
Output Over Voltage
20 us
Delay Time
Power Good Threshold
Power Good Hysteresis
Power Good Delay Time
VFB Rising (Good) 88 90 92 %VREF
2 %VREF
10 us
Thermal Shutdown
Temperature
TSD
150 °C
Thermal Shutdown
THYS
15 °C
hysteresis
Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability
Note 2: θ JA is measured in the natural convection at TA = 25°C on a four-layer Silergy Evaluation Board..
Note 3: The device is not guaranteed to function outside its operating conditions.
AN_SY8208A
4

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SY8208A 전자부품, 판매, 대치품
Output Ripple
(VIN=12V, VOUT=5V, ILOAD=8A)
∆Vout(AC)
20mV/div
VLX 5V/div
IL 5A/div
Time (2µs/div)
昱灿电子 www.szyucan.com 
AN_SY8208A
Output Voltage VS Frequency(Io=4A)
850
800
750
700
650
600
550
500
450
400
012345
Output Voltage(V)
6
AN_SY8208A
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부품번호상세설명 및 기능제조사
SY8208A

Synchronous Step Down Regulator

Silergy
Silergy

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