Applications Note: AN_ SY7152
High Efficiency 1MHz, 2A Step Up Regulator
Preliminary Specification
General Description
The SY7152 is a high efficiency boost regulator
targeted for general step-up applications.
Features
•
•
•
•
•
•
•
•
Wide input range: 3-8V bias input, 16Vout max
1MHz switching frequency
Minimum on time: 100ns typical
Minimum off time: 100ns typical
Low R
DS(ON)
: 150m
Ω
RoHS Compliant and Halogen Free
Accurate Reference: 0.6V
REF
Compact package: SOT23-6
Ordering Information
SY7152
□
(
□□
)
□
Temperature Code
Package Code
Optional Spec Code
Temperature Range:
-
40°C to 85°C
Ordering Number
SY7152ABC
Package type
SOT23-6
Note
2A
Applications
•
WLED Drivers
•
Networking cards powered from PCI or PCI-
express slots
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency vs Load Current
AN_SY7152 Rev.0.1
Silergy Corp. Confidential- Prepared for Customer Use Only
1
AN_SY7152
Pinout (top view)
（SOT23-6）
Top Mark: LExyz (Device
code: LE,
x=year code, y=week code, z= lot number code)
Pin Name
IN
GND
LX
FB
Pin Number
5
2
1
3
Pin Description
Input pin. Decouple this pin to GND pin with 1uF ceramic cap.
Ground pin
Inductor node. Connect an inductor between IN pin and LX pin.
Feedback pin. Connect a resistor R1 between V
OUT
and FB, and a
resistor R2 between FB and GND to program the output voltage:
V
OUT
=0.6V*(R1/R2+1).
Enable control. High to turn on the part. Don’t leave it floated.
No connection.
EN
NC
4
6
Absolute Maximum Ratings
(Note 1)
LX, IN, EN ----------------------------------------------------------------------------------------------------------------------- 18V
All other pins-------------------------- ------------------------------------------------------------------------------------------ 3.6V
Power Dissipation, P
D
@ T
A
= 25°C SOT23-6 ----------------------------------------------------------------------------- 0.6W
Package Thermal Resistance (Note 2)
θ
JA
--------------------------------------------------------------------------------------------------------------- 161°C/W
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
Recommended Operating Conditions
(Note 3)
Input Voltage Supply------------------------------------------------------------------------------------------------------ 3V to 8V
Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------
-
40°C to 85°C
AN_SY7152 Rev.0.1
Silergy Corp. Confidential- Prepared for Customer Use Only
2
AN_SY7152
Electrical Characteristics
(V
IN
= 5V, V
OUT
=12V, I
OUT
=100mA, T
A
= 25°C unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Low Side Main FET
RON
Main FET Current
Limit
Switching Frequency
Feedback Reference
Voltage
IN UVLO Rising
Threshold
UVLO Hysteresis
Thermal Shutdown
Temperature
EN Rising Threshold
EN Falling Threshold
EN Pin Input Current
Max Duty Cycle
Symbol
V
IN
I
Q
I
SHDN
Rds(on)
I
LIM1
Fsw
V
REF
V
IN,UVLO
U
VLO,HYS
T
SD
V
ENH
V
ENL
I
EN
Test Conditions
V
FB
=0.66V
EN=0
Min
3
Typ
100
Max
8
15
150
2
0.8
0.588
1
0.6
1.2
0.612
1.8
0.1
150
1.5
0
90
0.4
100
Unit
V
µA
µA
mΩ
A
MHz
V
V
V
°C
V
V
nA
%
Note 1:
Stresses listed beyond the “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 may
remain possibility to affect device reliability.
Note 2:
θ
JA is measured in the natural convection at T
A
= 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.
Note 3:
The device is not guaranteed to function outside its operating conditions.
Note 4:
IC could be start up in 1.8V.
AN_SY7152 Rev.0.1
Silergy Corp. Confidential- Prepared for Customer Use Only
3
AN_SY7152
Typical Performance Characteristics
Load Transient
(V
IN
=5V, V
OUT
=12V,I
load
=0.1~0.5A)
V
OUT(AC)
(0.5V/div)
I
o
(0.2A/div)
Time(100us/div)
AN_SY7152 Rev. 0.1
Silergy Corp. Confidential- Prepared for Internal Use Only
4
AN_SY7152
Output Ripple
(V
IN
=5V, V
OUT
=12V,I
load
=40mA)
L
X
(5V/div)
V
O
(AC)
(20mV/div)
I
L
(0.5A/div)
Time(400ns/div)
Output Ripple
(V
IN
=5V, V
OUT
=12V,I
load
=500mA)
L
X
(5V/div)
I
L
(0.5A/div)
V
O
(AC)
(50mV/div)
Time(400ns/div)
AN_SY7152 Rev. 0.1
Silergy Corp. Confidential- Prepared for Internal Use Only
5
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