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PDF AN-SY8368A Data sheet ( Hoja de datos )
| Número de pieza | AN-SY8368A | |
| Descripción | Synchronous Step Down Regulator | |
| Fabricantes | Silergy | |
| Logotipo |  |
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Application Notes: AN_SY8368A
High Efficiency Fast Response
8A Continuous, 16A Peak, 28V Input
Synchronous Step Down Regulator
General Description
The SY8368A develops a high efficiency synchronous
step-down DC-DC regulator capable of delivering 8A
continuous, 16A peak current. The SY8368A operates
over a wide input voltage range from 4.0V to 28V and
integrates main switch and synchronous switch with
very low RDS(ON) to minimize the conduction loss.
The SY8368A 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
SY8368 □(□□)□
Tempera ture Code
Packa ge Code
Optional Spec Code
Ordering Number Package type
SY8368AQQC QFN3x3-12
Note
--
Features
• 4.0-28V wide input voltage range
• Low RDS(ON) for internal switches: 20/10mΩ
• Instant PWM architecture to achieve fast transient
response
• Internal 600us soft-start limits the inrush current
• Pseudo-constant frequency: 800kHz
• 8A continuous, 16A peak output current capability
• +/-1% 0.6V reference voltage
• Hiccup mode SCP, OVP
• Thermal shutdown with auto recovery
Applications
• LCD-TV/Net-TV/3DTV
• Set Top Box
• Notebook
• High Power AP
Typical Applications
VIN
CIN
High/Floating/Low
ON/OFF
CVCC
IN
GND
ILMT
EN
VCC
PG
BS
LX
FB
PG (Open Drain Output)
CBS
L
CFF
RFF
R1
R2
VOUT
COUT
Figure 1 Schematic
Figure 2. Efficiency
AN_SY8368A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 1
1 page  
AN_SY8368A
Typical Performance Characteristics
Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
0.001
VIN=7.4V,VOUT=5.0V
VIN=12V,VOUT=5.0V
VIN=19V,VOUT=5.0V
VIN=28V,VOUT=5.0V
0.01 0.10
1.00
Load Current (A)
10.00
100
90
80
70
60
50
40
30
20
0.001
Efficiency vs. Load Current
VIN=5.0V,VOUT=3.3V
VIN=12V,VOUT=3.3V
VIN=19V,VOUT=3.3V
VIN=28V,VOUT=3.3V
0.01 0.10
1.00
Load Current (A)
10.00
95
85
75
65
55
45
35
25
15
0.001
Efficiency vs. Load Current
VIN=5.0V,VOUT=1.8V
VIN=12V,VOUT=1.8V
VIN=19V,VOUT=1.8V
VIN=28V,VOUT=1.8V
0.01 0.10
1.00
Load Current (A)
Load Transient
(VIN=12V, VOUT=5V, ILOAD=0.8-8A)
10.00
∆VOUT
100mV/div
IL 5A/div
Efficiency vs. Load Current
95
85
75
65
55
45
VIN=5.0V,VOUT=1.2V
35 VIN=12V,VOUT=1.2V
VIN=19V,VOUT=1.2V
25 VIN=28V,VOUT=1.2V
15
0.001
0.01
0.10
1.00 10.00
Load Current (A)
Load Transient
(VIN=12V, VOUT=5V, ILOAD=2-6A)
∆VOUT
100mV/div
IL 2A/div
Time (200µs/div)
Time (200µs/div)
AN_SY8368A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 5
5 Page 
AN_SY8368A
Recommended PCB layout
(Reference Only)
Notes: All dimension in MM and exclude mold flash & metal burr.
AN_SY8368A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AN-SY8368A.PDF ] | |
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