SY8009A/SY8009B
High Efficiency 1.5MHz/1MHz, 1.5A/2A
Synchronous Step Down Regulator
General Description
Features
The SY8009A and SY8009B are high-efficiency, high
frequency synchronous step-down DC-DC regulator
ICs capable of delivering up to 1.5A/2A output
currents. The SY8009 family operate over a wide input
voltage range from 3V to 5.5V and integrate main
switch and synchronous switch with very low RDS(ON)
to minimize the conduction loss.
• Low RDS(ON) for internal switches (top/bottom)
• SY8009A: 180mΩ/120mΩ, 1.5A, SOT23-5
• SY8009B:100mΩ/80mΩ,2.0A
SOT23-6, SSOT23-6
• 3-5.5V input voltage range
• High switching frequency minimizes the external
components
• SY8009A: 1.5MHz
• SY8009B: 1MHz
• Internal softstart limits the inrush current
• 100% dropout operation
• RoHS Compliant and Halogen Free
• Compact package: SOT23-5, SOT23-6 and Super
SOT23-6 are pin-compatible. Other packages are
available upon requests
Low output voltage ripple and small external inductor
and capacitor sizes are achieved with greater than
1MHz switching frequency.
Ordering Information
SY8009□(□□)□
Temperature Code
Package Code
Optional Spec Code
Applications
•
•
•
•
•
Temperature Range: -40°C to 85°C
Ordering Number
SY8009AAAC
SY8009BABC
SY8009BEBC
Note①
1.5A
2A
2A
Package type
SOT23-5
SOT23-6
SSOT23-6
LCD TV
Set Top Box
Net PC
Mini-Notebook PC
Access Point Router
Typical Applications
96
VOUT=1.8V
94
ON/ OFF
L
VIN
VOUT
LX
IN
R1
CIN
GND
C1(opt.)
COUT
FB
R2
Efficiency (%)
92
EN
90
88
86
82
80
Figure 1.Schematic diagram
SY8009A/B Rev1.0
VIN=3.3V
VIN=4.2V
VIN=5.5V
84
0
0.4
0.8
1.2
1.6
2
Load Current (A)
Figure 2. Efficiency vs Load Current
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SY8009A/SY8009B
Pinout (top view)
EN 1
6 FB
GND 2
5 NC
LX 3
SOT23-5(SY8009A)
Pin Name
EN
GND
LX
IN
FB
SOT23-6(SY8009B)
4 IN
SSOT23-6(SY8009B)
Part Number
Package type
Top Mark①
SY8009AAAC
SOT23-5
ADxyz
SY8009BABC
SOT23-6
CUxyz
SY8009BEBC
SSOT23-6
ASxyz
Note① : x=year code, y=week code, z= lot number code.
Pin Number
Pin Description
1
Enable control. Pull high to turn on. Do not float.
2
Ground pin
3
Inductor pin. Connect this pin to the switching node of inductor.
4
Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap.
6
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 ------------------------------------------------------------------------------------------ 6.0V
Enable, FB Voltage--------------------------------------------------------------------------------------------- VIN + 0.6V
Power Dissipation, PD @ TA = 25°C,
SOT23-5, SOT23-6, SSOT23-6 -------------------------------------------------------------------- 0.6W
Package Thermal Resistance (Note 2)
SOT23-5, SOT23-6, SSOT23-6, θ JA -------------------------------------------------------------- 170°C/W
SOT23-5, SOT23-6, SSOT23-6, θ JC ---------------------------------------------------------------130°C/W
Junction Temperature Range ----------------------------------------- -----------------------------------------125°C
Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------- 260°C
Storage Temperature Range ---------------------------------------------------------------------------------- -65°C to 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------ 200V
Dynamic LX voltage in 50ns duration --------------------------------------------------------------------- IN+3V to GND-4V
Recommended Operating Conditions (Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------3V to 5.5V
Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------- -40°C to 85°C
SY8009A/B Rev1.0
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SY8009A/SY8009B
Electrical Characteristics
(VIN = 5V, VOUT = 2.5V, L = 2.2uH, COUT = 10uF, TA = 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Feedback Reference Voltage
FB Input Current
PFET RON
Symbol
VIN
IQ
ISHDN
VREF
IFB
RDS(ON),P
NFET RON
RDS(ON),N
PFET Current Limit
ILIM
EN rising threshold
EN falling threshold
Input UVLO threshold
UVLO hysteresis
Oscillator Frequency
VENH
VENL
VUVLO
VHYS
FOSC
Min ON Time
Max Duty Cycle
Thermal Shutdown
Temperature
Test Conditions
IOUT=0, VFB=VREF ⋅ 105%
EN=0
VFB=VIN
SY8009A
SY8009B
SY8009A
SY8009B
SY8009A
SY8009B
Min
3
0.588
-50
Typ
80
0.1
0.6
Max
5.5
1
0.612
50
180
100
120
80
1.8
2.5
1.5
0.4
2.7
0.1
1.5
1
50
IOUT=200mA, SY8009A
IOUT=500mA, SY8009B
100
TSD
160
Unit
V
µA
µA
V
nA
mΩ
mΩ
mΩ
mΩ
A
A
V
V
V
V
MHz
MHz
ns
%
°C
Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.
These are for stress ratings. Functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may remain possibility to affect device reliability.
Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity
test board of JEDEC 51-3 thermal measurement standard. Pin 2 of SOT23-5/SSOT-23-6 packages is the case
position for θ JC measurement. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with
minimum recommended pad on top layer and thermal vias to bottom layer ground plane
Note 3: The device is not guaranteed to function outside its operating conditions.
SY8009A/B Rev1.0
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SY8009A/SY8009B
SOT23-5 Package outline & PCB layout design
0.55
1.50 - 1.70
0.80
2.70 - 3.00
2.40
2.80 - 3.10
0.95 TYP
0.30 - 0.50
0.01 - 0.1
0.1 - 0.15
0.25 REF
Recommended Pad Layout
1.0 - 1.3
0.95 TYP
0.3 - 0.6
1.90 TYP
Notes: All dimensions are in millimeters.
All dimensions don’t include mold flash & metal burr.
SY8009A/B Rev1.0
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SY8009A/SY8009B
SOT23-6 Package outline & PCB layout design
1.90
1.50 - 1.70
1.00
2.70 - 3.00
2.40
2.80 - 3.10
0.95
0.60
0.30 - 0.50
0.01 - 0.1
0.1 - 0.15
0.25 REF
Recommended Pad Layout
1.0 - 1.3
0.95 TYP
0.3 - 0.6
1.90 TYP
Notes: All dimensions are in millimeters.
All dimensions don’t include mold flash & metal burr.
SY8009A/B Rev1.0
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SY8009A/SY8009B
SSOT23-6 Package outline & PCB layout design
1.00
2.40
2.30 - 2.50
2.50 - 3.00
1.90
0.95
0.25 - 0.40
0.60
Recommended Pad Layout
0.10 - 0.20
0.90 - 1.00
0.01 - 0.10
2.95 - 3.10
0.30 - 0.60
0.95 TYP
Notes: All dimensions are in millimeters.
All dimensions don’t include mold flash & metal burr.
SY8009A/B Rev1.0
Silergy Corp. Confidential- Prepared for Customer Use Only
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