SY8089/SY8089A；High Efficiency 5.5V, 2A continuous, 3A peak, 1MH
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Application Note: AN_SY8089/SY8089A
High Efficiency 5.5V, 2A continuous, 3A peak, 1MHz
Synchronous Step Down Regulator
AN_SY8089/A Rev. 0.9A Silergy Corp. Confidential- Prepared for Customer Use Only 1
General Description
The SY8089 and SY8089A are high-efficiency, high
frequency synchronous step-down DC-DC regulator IC
capable of delivering up to 2A output current. The
SY8089 and SY8089A operate over a wide input
voltage range from 2.7V to 5.5V and integrate main
switch and synchronous switch with very low R
DS(ON)
to minimize the conduction loss.
Low output voltage ripple and small external inductor
and capacitor sizes are achieved with greater than
1MHz switching frequency.
SY8089 integrates short circuit and over-voltage latch
off protection.
Ordering Information
Package Code
Temperature Code
Optional Spec Code
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SY8089
Package Code
Temperature Code
Optional Spec Code
□
□□
□
(
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□□□□
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)
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SY8089
Temperature Range:
-
40°C to 85°C
Ordering Number Package type
Note
SY8089AAC SOT23-5
SY8089AAAC SOT23-5
Features
• Low R
DS(ON)
for internal switches
(top/bottom):110mΩ/80mΩ
• 2.7-5.5V input voltage range
• 2A continuous, 3A peak load current capability
• 1MHz switching frequency minimizes the external
components
• Internal softstart limits the inrush current
• Reliable short circuit protection:
SY8089: Latch off protection
SY8089A: Hic-cup mode protection
• Reliable over-voltage protection:
SY8089: Latch off protection
SY8089A: No latch off protection
• 100% dropout operation
• RoHS Compliant and Halogen Free
• Compact package: SOT23-5
Applications
• LCD TV
• Set Top Box
• Net PC
• Mini-Notebook PC
• Access Point Router
Typical Applications
!
"
##$%$&'%()*+
Figure 1.Schematic diagram Figure 2. Efficiency vs Load Current
Silergy Corp. Confidential-Prepared for Rockchip
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