Description
SE9017 is a complete constant-current &
constant voltage linear charger for single cell
lithium-ion and Lithium-Polymer batteries.
Its
SOT-23 package and low external component count
make SE9017 ideally suited for portable
applications.
Furthermore, the SE9017 is
specifically designed to work within USB power
specification. At the same time, SE9017 can also
be used in the standalone lithium-ion and
Lithium-polymer battery chargers.
No external sense resistor is needed, and no
blocking diode is required due to the internal
MOSFET architecture.
Thermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature. The charge voltage is fixed
at 4.2V, and the charge current can be programmed
externally with a single resistor. The SE9017
automatically terminates the charge cycle when the
charge current drops to 1/10
th
the programmed
value after the final float voltage is reached.
When the input supply (wall adapter or USB
supply) is removed, the SE9017 automatically
enters a low current stage, dropping the battery
drain current to less than 2uA. The SE9017 can
be put into shutdown mode, reducing the supply
current to 20uA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a
status pin to indicate charge termination and the
presence of an input voltage. SE9017 is
intentionally designed to have slightly negative
Tempco. This provides extra protection to Lithium
battery during charging.
Features
Programmable Charge Current Up to 800mA.
No MOSFET, Sense Resistor or Blocking Diode
Required.
Constant-Current/Constant-Voltage Operation
with Thermal Protection to Maximize Charge
Rate without Risk of Overheating.
Charges Single Cell Li-Ion Batteries Directly
from USB Port.
Preset 4.2V Charge Voltage with
±1%
Accuracy.
20uA Supply Current in Shutdown.
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current.
Available in 6-Lead SOT-23 and PSOP-8
(Exposed Pad) Packages.
RoHS Compliant and 100% Lead (Pb)-Free
Application
Cellular Telephones, PDA’s, MP3 Players.
Charging Docks and Cradles
Bluetooth Applications
Application Diagram
Pin Configuration
Revision 12/11/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 1
Absolute Maximum Rating
(1)
Parameter
Input Supply Voltage
PROG Voltage
BAT Voltage
CHRG Voltage
BAT Short-Circuit Duration
Thermal Resistance, Junction-to-Ambient
BAT Pin Current
PROG Pin Current
Maximum Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
Θ
JA
I
BAT
I
PROG
T
J
T
S
Symbol
V
CC
V
PROG
V
BAT
V
CHRG
Value
7
VCC+0.3
7
7
Continuous
250 (SOT-23-6)
75(PSOP8)
800
800
125
-65 to +125
300
°C/W
mA
µA
°C
°C
°C
Units
V
V
V
V
Operating Rating
(2)
Parameter
Supply Input Voltage
Junction Temperature
Symbol
V
IN
T
J
Value
-0.3 to +7
-40 to +85
Units
V
°C
Electrical Characteristics
V
IN
= 5V; T
J
= 25°C; unless otherwise specified.
Symbol
V
CC
I
CC
Parameter
Input Supply Voltage
Input Supply Current
Charge Mode
(3)
, R
PROG
= 10k
Standby Mode (Charge Terminated)
Shutdown Mode(R
PROG
Not Connected,
V
CC
< V
BAT
, or V
CC
< V
UV
)
Conditions
Min
4.25
Typ
110
70
20
Max
6
500
40
4.3
130
+/-5
+/-5
+/-5
Unit
V
µA
µA
µA
V
mA
mA
µA
µA
µA
mA
V
FLOAT
I
BAT
Regulated Output (Float) Voltage
BAT Pin Current
I
BAT
= 30mA, I
CHRG
= 5mA
R
PROG
= 10k, Current Mode
R
PROG
= 2k, Current Mode
Standby Mode, VBAT = 4.2V
Shutdown Mode (R
PROG
Not Connected)
4.15
90
0
4.22
106
530
+/-1
+/-0.5
+/-1
10
Sleep Mode, V
CC
= 0V
I
TRIKL
V
TRIKL
Trickle Charge Current
Trickle Charge Threshold Voltage
V
BAT
< V
TRIKL
, R
PROG
= 10k
R
PROG
= 10k, V
BAT
Rising
2.8
2.9
3.0
V
Revision 12/11/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 2
Electrical Characteristics (Continued)
V
IN
= 5V; T
J
= 25°C; unless otherwise specified
Symbol
V
UV
V
UVHYS
V
MSD
V
ASD
I
TERM
V
PROG
I
CHRG
V
CHRG
ΔV
RECHRG
T
LIM
t
SS
t
RECHARGE
t
TERM
I
PROG
Parameter
V
CC
Undervoltage Lockout Threshold
V
CC
Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
PROG Pin Rising
PROG Pin Falling
V
CC
– V
BAT
Lockout Threshold Voltage
C/10 Termination Current Threshold
V
CC
from Low to High
V
CC
from High to Low
R
PROG
= 10k
(4)
R
PROG
= 2k
PROG Pin Voltage
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
Recharge Battery Threshold Voltage
Thermal Protection Temperature
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-Up Current
I
BAT
= 0 to 1000V/R
PROG
V
BAT
High to Low
I
BAT
Falling Below I
CHG
/10
R
PROG
= 10k, Current Mode
V
CHRG
= 3V
I
CHRG
= 5mA
V
FLOAT
- V
RECHRG
0.9
Conditions
From V
CC
Low to High
Min
Typ
3.4
100
1.25
1.2
100
30
0.1
0.1
1.03
15
0.6
100
120
100
1
1000
1
1.1
Max
Unit
V
mV
V
V
mV
mV
mA/mA
mA/mA
V
µA
V
mV
°C
µs
ms
µs
µA
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2:
The device is not guaranteed to function outside its operating rating.
Note 3:
Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery
through the BAT pin (approximately 100mA).
Note 4:
I
TERM
is expressed as a fraction of measured full charge current with indicated PROG resistor.
Pin Functions
Pin
Pin Function Description
P Positive Input Supply Voltage. Provides
power to the charger. VCC can range
from 4.25V to 6.5V and should be
bypassed with at least a 1µF capacitor.
Pin
Pin Function Description
Open-Drain Charge Status Output. When the battery is charging, the
CHRG pin is pulled low by an internal N-channel MOSFET. When the
charge cycle is completed, a weak pull-down of approximately 20uA is
connected to the CHRG pin, indicating an “AC present” condition.
VCC
CHRG
GND
Ground.
PROG
Charge Current Program, Charge Current Monitor and Shutdown Pin.
Open-Drain Charge Termination Status Output. When the battery is
Charge Current Output. Provides
charging, the CHRGT pin is pulled high by an external
compenent
BAT
charge current to the battery and
regulates the final float voltage to 4.2V.
CHRGT
such as an LED. After the charging is completed, this pin is pulled low
by internal N-channel MOSFET and it can be used as a charging
termination indicator.
Revision 12/11/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 3
BLOCK DIAGRAM
Revision 12/11/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 4
Float Voltage vs Supply Voltage
4.230
4.225
4.220
4.215
V
BAT
(V)
4.210
4.205
4.200
4.195
4.190
4.185
4.0
4.5
5.0
5.5
V
CC
(V)
6.0
6.5
R
PROG
=10k
T
A
=25
℃
I
BAT
(m A )
600
Charge Current vs Supply Voltage
R
PROG
=2k
500
400
300
200
100
0
4.0
R
PROG
=10k
4.5
5.0
5.5
V
CC
(V)
Float Voltage vs Temperature
4.215
V
BAT
=4V
T
A
=25
℃
ONSET OF
THERMAL
REGULATION
6.0
6.5
7.0
Trickle Charge Current vs Supply Voltage
70
60
50
40
I
TR IKL
(mA)
30
20
10
0
4.0
R
PROG
=10k
V
BAT
=2.5V
T
A
=25
℃
R
PROG
=2k
4.210
4.205
V
FLOAT
(V)
7.0
4.200
4.195
4.190
4.185
4.5
5.0
5.5
V
CC
(V)
6.0
6.5
20
40
60
80
Temperature (
℃
)
100
120
Revision 12/11/2009
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 5
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