SE3608
2A/1.2Mhz Output Current, Boost Converter
General Description
The SE3608 is a high efficiency current-mode boost
converter with a fixed operation frequency. The
SE3608 integrates a very low Rds-on NMOSFET to
reduce power loss and achieve higher efficiency. The
maximum efficiency is up to 93%. SE3608 can output
2A current when Vin is higher than 3.3V and output is
5V. The high 1.2MHz operation frequency minimizes L
and C value. The internal compensation network
reduces external component counts. Small foot print
SOT23-6 package provides the best solution for PCB
layout area.
Features
Wide Input Range: 2.5-6V Input
Up to 1.5A Output Current
Maximum 8V Output Voltage
1.2MHz Switching Frequency
Low RDS(ON): 70mΩ
Up to 90% Efficiency
Under-Voltage Lockout Protection
Over-Temperature Protection
Internal Soft Start
1uA Shutdown Current
Accurate Reference: 0.6V V
REF
Compact package: SOT23-6
SE3608 is designed with 12V process. This allows
SE3608 to be used in applications where higher
voltage is needed, such as charging two Lithium
batteries in series. The other possible application
where the higher voltage is needed is Qualcomm
Quick Charge 2.0 compatible portable chargers.
SE3608 can support 9V Vout for this application.
Applications
Chargers
LCD Displays
Digital Cameras
Handheld Devices
Portable Products
Typical Application
L1
2.2uH
Schottky
C
FB
22pF
R1
440K
EN
GND
FB
VIN
VOUT
C
IN
22uF
OFF/ON
IN
SW
C
OUT1
22uF×2
C
OUT2
100 nF
R2
60K
Rev1.0
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page
1
9/4/2012
SE3608
2A/1.2Mhz Output Current, Boost Converter
Pin Configuration
Pin Description
NO.
1
2
3
4
5
6
Pin Name
SW
GND
FB
EN
IN
NC
GND
Feedback
Enable pin. A high input at EN enables the device and a low input disables the
devices. When not used, connect EN to the input source for automatic startup.
Input Supply Pin. Must be locally bypassed.
No Internal Connection
Pin Function Description
Power Switch Output. Connect the inductor and the blocking Schottky diode to SW.
Functional Block Diagram
VIN
SW
UVLO
OTP
Internal
Compensation
Internal
Soft Start
Logic
Control
OVP
+
PWM
-
Currnet Sense
Slope
Compensation
EN
EN
Logic
- +
Vref
EA
Driver
FB
GND
Rev1.0
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page
2
9/4/2012
SE3608
2A/1.2Mhz Output Current, Boost Converter
Absolute Maximum Ratings
Symbol
VIN
V
SW
V
IO
P
TR1
T
stg
T
solder
ESD Susceptibility
Parameter
V
IN
Supply Voltage
Voltage at SW Pin
All Other I/O Pins
Thermal Resistance(SOT23-6)
Θ
JA
Storage Temperature
Package Lead Soldering Temperature（10s）
HBM(Human Body Mode)
Maximum
-0.3½6.5
-0.5½12
GND-0.3 to VDD+0.3
220
-55 to 150
260
2
Units
V
V
V
℃/W
℃
℃
kV
Note: Exceeding these ratings may damage the device.
Recommended Operating Conditions
Symbol
V
IN
V
SW
T
A
T
J
Parameter
Input Voltage
Output Voltage
Ambient Temperature
Junction Temperature
Maximum
2.5 to 6
VIN to 10
-40 to +85
-40 to +125
Units
V
V
℃
℃
Note: The device is not guaranteed to function outside of its operating rating.
Rev1.0
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page
3
9/4/2012
SE3608
2A/1.2Mhz Output Current, Boost Converter
Electrical Characteristics
（V
IN
= 3.3V, V
OUT
=5V, I
OUT
=100mA, T
A
= 25°C unless otherwise specified）
Symbol
V
IN
Parameter
Input Voltage
Conditions
Feedback
Min.
2.5
Typ.
Max. Unit
6
V
V
FB
I
bias
Feedback Voltage
FB Pin Input Bias Current
UVLO
588
600
0.05
612
1
mV
µA
UVLO
Under Voltage Lock Out
Operating Current
2.1
V
I
off
I
sby
F
sw
D
max
Operating Current Shutdown）
（
No Switching
Switching Frequency
Maximum Duty Cycle
V
FB
=0V
Chip Enable
Vin=3V V
FB
=0.7V
0.1
100
1.2
90
1
µA
µA
MHz
%
V
EN_H
V
EN_L
V
HYS
I
EN
EN Minimum High Level
EN Maximum Low Level
EN Hysteresis
EN Input Bias Current
OTP
1.5
0.4
90
1
V
V
mV
µA
OTP
OTP
Hysteresis
Output Switch
R
ON
I
LIMIT
I
LEAK
SW On Resistance (Note 3)
SW Current Limit
SW Leakage Current
V
sw
＝5V
120
20
℃
℃
70
5
0.01
1
mΩ
A
µA
Open Circuit Protection
V
OV
SE3608
Soft Start
t
ss
Soft Start Time (Note 3)
V
IN
Power On
400
µS
V
OUT
×112%
V
Note3: Guaranteed by design.
Rev1.0
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page
4
9/4/2012
SE3608
2A/1.2Mhz Output Current, Boost Converter
Typical Performance Characteristics
Current Load Vs Efficiency
94
Current Load Vs Efficiency
93
92
92
91
90
Efficiency / %
Efficiency / %
90
89
88
87
86
88
86
Vin=3.6V,Vout=5V
84
Vin=3.6V,Vout=5V
0
0.5
1
1.5
2
2.5
82
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
85
I Load / A
I Load / A
Fig 1 Efficiency Vs Light Load
Fig 2 Efficiency Vs Heavy Load
Fig 3 Startup with V
in
Fig 4 SW Waveform
Fig 5 Transient Response
(V
IN
=3.6V, Vout=5V, I
load
=0.9A to 0.15A)
Fig 6 Transient Response
(V
IN
=3.6V, Vout=5V, I
load
=0.15A to 0.9A)
Fig 7 Vout Ripple
Rev1.0
Fig 8 Quiescent Current Vs Temperature
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., • www.seawardinc.com.cn • Page
5
9/4/2012
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