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PDF SY8805A Data sheet ( Hoja de datos )
| Número de pieza | SY8805A | |
| Descripción | 5A Synchronous Step Down Regulator | |
| Fabricantes | Silergy | |
| Logotipo |  |
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Applications Note: AN_SY8805A
High Efficiency 1 MHz, 5A
Synchronous Step Down Regulator
General Description
The SY8805A is a high-efficiency 1 MHz synchronous
step-down DC-DC regulator, Current Mode Control IC
capable of delivering up to 5A output current. The
SY8805A operates over a wide input voltage range
from 3V to 5.5V. It integrates main switch and
synchronous switch with very low RDS(ON) to minimize
the conduction loss. High intergrated solution and
DFN2x2-8 package perform the optimized BOM cost
and reduce external component part count. Low input
and output voltage ripple, small external inductor and
capacitor sizes, small PCB layout space are achived
with 1MHz switching frequency.
Ordering Information
SY8805□(□□)□
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY8805ADFC
DFN2x2-8
--
Features
• Low RDS(ON) for internal switches (top/bottom):
35/15 mohm
• 3-5.5V input voltage range
• 1 MHz switching frequency minimizes the external
components
• Internal softstart limits the inrush current
• Up to 98% efficiency
• 0.6V reference voltage
• Shutdown mode draws<0.1uA supply current
• 100% dropout operation
• Power good indicator
• OVP/OCP/UVLO/OTP protections
• RoHS Compliant and Halogen Free
• Compact package: DFN2x2-8
Applications
• High definition Set Top Box
• LCD TV
• Access Point Router
• Mini-notebook PC
• Net PC
Typical Applications
Figure 1. Schematic
Figure 2. Efficiency vs Load Current
AN_SY8805A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 1
1 page  
AN_SY8805A
Block Diagram
AN_SY8805A Rev. 0.9A Silergy Corp. Confidential- Prepared for Customer Use Only 5
5 Page 
BOM List
Reference Designator
U1
C1
C2 , C3
C4, C5
C7
L1
R1
R2
R3
R4
Description
5A, 1MHz Sync
Buck(DFN2*2-8)
470uF/16V
(electrolytic capacitor)
22uF/10V,1206,X5R
47uF/6.3V,1206, X5R
22pF/50V/C0G,0603
0.47uH/20.5A inductor
100k, 1%,0603
49.9k,1%,0603
100k, 0603
1M, 0603
AN_SY8805A
Part Number
SY8805ADFC_1
Manufacturer
C3216X5R1A226M
C3216X5R0J4765M
C1608C0G1H220J
SPM6530T-R47M
TDK
TDK
TDK
TDK
Output voltage ripple test
A proper output ripple measurement should be done according to Figure 6 setup. Output voltage ripple should
be measured across the output ceramic cap near the IC.
1. Remove the ground clip and head of the probe. Wind thin wires around the ground ring of the probe. Solder
the end of the ground ring wire to the negative node of the COUT. Touch the probe tip to the positive node
of the COUT. Refer to Figure.6.
2. Minimize the loop formed by COUT terminals, probe tip and ground ring.
3. Change the probing direction to decouple the electromagnetic noise generated from the nearby buck
inductor (Refer to Figure.6).
Figure.6 Recommended way to measure the output voltage ripple
AN_SY8805A Rev. 0.9B Silergy Corp. Confidential- Prepared for Customer Use Only 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SY8805A.PDF ] | |
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