AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Features
• Ideal for Single-Cell (4.1 V or 4.2 V) and Li-Ion
or Li-Pol Packs
• Better Than
±1%
Voltage Regulation Accuracy
With Preset Voltages
• Optional Cell-Temperature Monitoring Before
and During Charge
• Integrated Voltage and Current Regulation With
Programmable Charge-Current and High or
Low-Side Current Sensing
• Charge Status Output for Single or Dual Led or
Host Processor Interface
• Automatic Battery-Recharge Feature
• Charge Termination by Minimum Current
• Automatic Low-Power Sleep Mode When VCC
is Removed
•Requires Small Number of External
Components
• Packaging: 8-Pin MSOP
General Description
The AT1457 series Lithium-Ion (Li-Ion) and
Lithium-Polymer (Li-Pol) linear charge ICs are
designed for cost-sensitive and compact portable
electronics. They combine high-accuracy current
and voltage regulation, battery conditioning,
temperature monitoring, charge termination, and
charge-status indication in a single 8-pin IC.
MSOP package options are offered to fit a wide
range of end applications.
The AT1457 continuously measures battery
temperature using an external thermistor. For
safety, the AT1457 inhibits charge until the battery
temperature is within user-defined thresholds.
The AT1457 then charges the battery in three
phases: conditioning, constant current, and
constant voltage. If the battery voltage is below the
low-voltage threshold, V(min), the AT1457
precharges using a low current to condition the
battery. The conditioning charge rate is
approximately 10% of the regulation current. After
conditioning, the AT1457 applies a constant
current to the battery. An external sense-resistor
sets the current. The sense-resistor can be on either
the high or low side of the battery without
additional components. The constant-current phase
continues until the battery reaches the charge-
regulation voltage. The AT1457 then begins the
constant-voltage phase. The accuracy of the
voltage regulation is better than
±1%
over the
operating- temperature and supply-voltage ranges.
For single cells, the AT1457 is offered in two
fixed-voltage versions: 4.1 V, and 4.2 V. Charge
stops when the current tapers to the charge
termination threshold, I
(TERM)
. The AT1457
automatically restarts the charge if the battery
voltage falls below the V
(RCH)
threshold.
Applications
•1-Cell Lithium-Ion And Lithium-Polymer
Charger
• DSC
Aimtron reserves the right without notice to change this circuitry and
specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
1
AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Ordering Information
Part number
Package
AT1457M
MSOP8(4.2V version)
AT1457M_GRE MSOP8(4.2V version),Green
AT1457AM
MSOP8(4.1V version)
AT1457AM_GRE MSOP8(4.1V version),Green
Marking
1457
1457, date code with one bottom line
1457A
1457A, date code with one bottom line
Pin Description
Pin No. Symbol
1
VCC
2
TS
3
STAT
4
VSS
5
CC
6
VCC1
7
SNS
8
BAT
I/O
I
Supply voltage
I
Temperature sense input
O
Charge status output
— Ground
O
Charge control output
I
Supply voltage
I
Current sense input
I
Voltage sense input
Description
Absolute Maximum Ratings
Parameter
Power supply voltage
Input voltage
Sink current (STAT pin)
Source current (STAT pin)
Output current (CC pin)
Total power dissipation
Operating free-air temperature range
Storage temperature range
Lead temperature
Symbol
V
CC
V
(BAT)
V
(SNS)
V
(TS)
I
OL
I
OH
I
O(CC)
P
D
T
A
Tstg
T
L
Condition
—
—
—
—
not to exceed P
D
not to exceed P
D
not to exceed P
D
at 25℃
－
－
soldering, 10 s
Rated Value
Min.
Max.
-0.3
+8
-0.3
V
CC
+0.3
-0.3
V
CC
+0.3
-0.3
V
CC
+0.3
—
20
—
10
—
40
—
300
-20
+85
-40
+125
－
300
Unit
V
V
V
V
mA
mA
mA
mW
℃
℃
℃
Recommended Operating Conditions
Parameter
Power supply voltage
Operating free-air temperature range
Symbol
V
CC
T
A
Min.
4.5
-20
Values
Typ.
－
－
Max.
7
+85
Unit
Ｖ
°C
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
3
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