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SY8089A Datasheet Preview

SY8089A Datasheet

Synchronous Step Down Regulator

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Application Note: AN_SY8089/SY8089A
High Efficiency 5.5V, 2A continuous, 3A peak, 1MHz
Synchronous Step Down Regulator
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 RDS(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
SY8089 (□□)
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type
SY8089AAC
SOT23-5
SY8089AAAC
SOT23-5
Note
Features
Low RDS(ON) for internal switches
(top/bottom):110m/80m
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
VIN: 2.7-5.5V 4
IN
3 L1:2.2µH
LX
VOUT: 1.8V
ON/ OFF
CIN
22µF
1
FB 5
EN
GND
2
R1
200k
C1 COUT
22pF 22µFх2
R2
100k
Figure 1.Schematic diagram
Figure 2. Efficiency vs Load Current
AN_SY8089/A Rev. 0.9A Silergy Corp. Confidential- Prepared for Customer Use Only 1




Silergy

SY8089A Datasheet Preview

SY8089A Datasheet

Synchronous Step Down Regulator

No Preview Available !

Pinout (top view)
SY8089/8089A
Pin Name
EN
GND
LX
IN
FB
SOT23-5
Part Number
Package type
Top Mark
SY8089AAC
SOT23-5
JXxyz
SY8089AAAC
SOT23-5
KVxyz
Note① : x=year code, y=week code, z= lot number code
Pin Number
1
2
3
4
5
Pin Description
Enable control. Pull high to turn on. Do not float.
Ground pin.
Inductor pin. Connect this pin to the switching node of inductor.
Input pin. Decouple this pin to GND pin with at least 10µF ceramic cap.
Output Feedback Pin. Connect this pin to the center point of the output
resistor divider (as shown in Figure 1) to program the output voltage:
Vout=0.6*(1+R1/R2).
Absolute Maximum Ratings (Note 1)
Supply Input Voltage ----------------------------------------------------------------------------------------------- -0.3V to 6.0V
Enable, FB Voltage------------------------------------------------------------------------------------------ -0.3V to VIN + 0.6V
Power Dissipation, PD @ TA = 25°C,
SOT23-5 -------------------------------------------------------------------------------------------------------------- 0.6W
Package Thermal Resistance (Note 2)
θ JA --------------------------------------------------------------------------------------------------------------- 170°C/W
θ JC ----------------------------------------------------------------------------------------------------------------130°C/W
Junction Temperature Range ----------------------------------------- ------------------------------------------ -40°C to 150°C
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------------- 260°C
Storage Temperature Range ------------------------------------------------------------------------------------- -65°C to 150°C
Recommended Operating Conditions (Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 2.7V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------- -40°C to 85°C
AN_SY8089/A Rev. 0.9A Silergy Corp. Confidential- Prepared for Customer Use Only 2


Part Number SY8089A
Description Synchronous Step Down Regulator
Maker Silergy
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