Description
SE9016 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 SE9016 ideally suited for portable
applications.
Furthermore, the SE9016 is
specifically designed to work within USB power
specification. At the same time, SE9016 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 SE9016
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 SE9016 automatically
enters a low current stage, dropping the battery
drain current to less than 2uA. The SE9016 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. SE9016 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 5-Lead SOT-23 Package.
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 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • 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
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
4.242
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)
4.158
90
0
4.2
110
500
+/-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 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • 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.
Charge Current Output. Provides
BAT
charge current to the battery and
regulates the final float voltage to 4.2V.
Revision 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 3
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 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 4
Operation
The SE9016 is a single cell lithium-ion battery
charger using a constant-current/constant-voltage
algorithm. It can deliver up to 800mA of charge
current (using a good thermal PCB layout) with a
final float voltage accuracy of ±1%. The SE9016
includes an internal P-channel power MOSFET and
thermal regulation circuitry. No blocking diode or
external current sense resistor is required; thus, the
basic charger circuit requires only two external
components. Furthermore, the SE9016 is capable
of operating from a USB power source.
current are calculated using the following equations:
R
PROG
=
1100
V
1100
V
,
I
CHG
=
,
I
CHG
R
PROG
The charge current out of the BAT pin can be
determined at any time by monitoring the PROG pin
voltage using the following equation:
I
BAT
=
V
PROG
•
1100
R
PROG
Charge Termination
A charge cycle is terminated when the charge current
falls to 1/10th the programmed value after the final
float voltage is reached. This condition is detected by
using an internal, filtered comparator to monitor the
PROG pin. When the PROG pin voltage falls below
100mV for longer than t
TERM
(typically 1ms), charging
is terminated. The charge current is latched off and
the SE9016 enters standby mode, where the input
supply
current
drops
to
200mA.
(Note:
C/10
termination is disabled in trickle charging and thermal
limiting modes).
When charging, transient loads on the BAT pin can
cause the PROG pin to fall below 100mV for short
periods of time before the DC charge current has
dropped to 1/10th the programmed value. The 1ms
filter time (t
TERM
) on the termination comparator
ensures that transient loads of this nature do not
result in premature charge cycle termination. Once
the average charge current drops below 1/10th the
programmed value, the SE9016 terminates the
charge cycle and ceases to provide any current
through the BAT pin. In this state, all loads on the
BAT pin must be supplied by the battery.
The SE9016 constantly monitors the BAT pin voltage
in standby mode. If this voltage drops below the
4.05V recharge threshold (V
RECHRG
), another charge
cycle begins and current is once again
supplied to the
Normal Charge Cycle
A charge cycle begins when the voltage at the VCC
pin rises above the UVLO threshold level and a 1%
program resistor is connected from the PROG pin to
ground or when a battery is connected to the
charger output. If the BAT pin is less than 2.8V, the
charger enters trickle charge mode. In this mode,
the SE9016 supplies approximately 1/10 the
programmed charge current to bring the battery
voltage up to a safe level for full current charging.
When the BAT pin voltage rises above 2.8V, the
charger enters constant-current mode, where the
programmed charge current is supplied to the
battery. When the BAT pin approaches the final
float
voltage
(4.2V),
the
SE9016
enters
constant-voltage mode and the charge current
begins to decrease. When the charge current drops
to 1/10 of the programmed value, the charge cycle
ends.
Programming Charge Current
The charge current is programmed using a single
resistor from the PROG pin to ground. The battery
charge current is 1100 times the current out of the
PROG pin. The program resistor and the charge
Revision 6/7/2007
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
