Applications Note:SY7104
High Efficiency 6V, 4A, 1MHz Step Up Regulator
General Description
SY7104 is a high efficiency, current-mode control
Boost DC to DC regulator with an integrated 90mΩ
R
DS(ON)
N-channel MOSFET. The fixed 1MHz
switching frequency and internal compensation reduce
external component count and save the PCB space. The
build-in internal soft start circuitry minimizes the
inrush current at start-up.
Features
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•
•
•
•
•
•
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•
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Wide input range: 2-6V
1MHz switching frequency
Minimum on time: 100ns typical
Minimum off time: 100ns typical
Max output voltage: 6V
Internal 4A switch
Internal soft start
Over temperature protection
Over current protection
Low R
DS(0N)
: 90mΩ typical
RoHS Compliant and Halogen Free
Compact package: DFN3х
3-10
•
1-cell Li-ion Battery powered applications
•
Portable devices
Typical Applications
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SY7104 Rev. 0.9B
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Figure 1. Schematic Diagram
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Ordering Number
SY7104DBC
Package type
DFN3×3-10
Note
4A
Silergy Corp. Confidential- Prepared for Customer Use Only
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Temperature Range:
-
40°C to 85°C
Applications
d
Temperature Code
Package Code
Optional Spec Code
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Figure 2. Efficiency vs Load Current
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SY7104
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Ordering Information
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Free Datasheet http://www.0PDF.com
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SY7104
Pinout ( top view)
NC
FB
NC
LX
LX
1
2
3
4
5
11 GND
10 NC
9
8
7
6
EN
NC
VDD
NC
Top
Pin Name
NC
GND
LX
FB
`
Pin Number
1,3,6, 8,10
11
4,5
2
Pin Description
FB pin-------------------------------------------------------------------------------------------------------------------- -0.3V to 4V
All other pins------------------------------------------------------------------------------------------------------------ -0.3V to 7V
Power Dissipation, P
D
@ T
A
= 25°C DFN3×3-10, -----------------------------------------------------------------------2.6W
Package Thermal Resistance (Note 2)
θ
JA
-----------------------------------------------------------------------------------------------------------------38°C/W
θ
JC
------------------------------------------------------------------------------------------------------------------ 8°C/W
Junction Temperature Range -------------------------------------------------------------------------------------- -40 to 150°C
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------------- 260°C
Storage Temperature Range ------------------------------------------------------------------------------------
-
65°C to 150°C
Dynamic LX voltage in 50ns duration --------------------------------------------------------------------------------- VIN+3V
SY7104 Rev0.9B
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FB pin------------------------------------------------------------------------------------------------------------------ -0.3V to 3.6V
VDD pin-------------------------- ------------------------------------------------------------------------------------------ 2V to 6V
All other pins-------------------------- ------------------------------------------------------------------------------------ 0V to 6V
Junction Temperature Range ------------------------------------------------------------------------------------ -40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
-
40°C to 85°C
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Recommended Operating Conditions
(Note 3)
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Silergy Corp. Confidential- Prepared for Internal Use Only
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Absolute Maximum Ratings
(Note 1)
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EN
VDD
9
7
No connection.
Ground pin.
Phase node. Connect an inductor across the power input and this pin.
Feedback pin. Connect a resistor R1 between V
OUT
and FB, and a
resistor R2 across FB and GND to program the output voltage:
V
OUT
=0.6V×(R1/R2+1)
Enable control. Pull high to turn on. Do not leave it floating.
IC power supply input
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Free Datasheet http://www.0PDF.com
(DFN3×3-10)
Mark:
ELxyz (Device
code: EL ,
x=year code, y=week code, z= lot number code)
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SY7104
Block Diagram
SY7104 Rev0.9B
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Free Datasheet http://www.0PDF.com
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SY7104
Electrical Characteristics
(V
IN
= 3V, V
OUT
=5V, I
OUT
=1A, T
A
= 25°C unless otherwise specified)
SY7104 Rev0.9B
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Note 3:
The device is not guaranteed to function outside its operating conditions
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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. 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.
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Note 1:
Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
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Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Low Side Main FET R
ON
Main FET Current Limit
Switching Frequency
Feedback Reference Voltage
VDD UVLO Rising Threshold
UVLO Hysteresis
Thermal Shutdown Temperature
EN Rising Threshold
EN Falling Threshold
EN Pin Input Current
Symbol
V
IN
I
Q
I
SHDN
R
DS(ON)
I
LIM
F
SW
V
REF
V
IN
_
UVLO
V
UVLO
_
HYS
T
SD
V
ENH
V
ENL
I
EN
Test Conditions
V
FB
=0.66V
EN=0
Min
2
Typ
100
Max
6
10
90
4
0.588
1
0.6
0.1
150
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1.5
0
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0.4
100
N
0.612
1.9
Unit
V
µA
µA
mΩ
A
MHz
V
V
V
°C
V
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Free Datasheet http://www.0PDF.com
SY7104
Typical Performance Characteristics
SY7104 Rev0.9B
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Free Datasheet http://www.0PDF.com
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