AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Features
• Ideal for Single-Cell (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.
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.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
10/3/2006 REV:1.2
Email:
service@aimtron.com.tw
1
AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Ordering Information
Part number
AT1457M
Package
MSOP8(4.2V version)
Marking
1457,Date Code with one bottom line
*
For more marking information, contact our sales representative directly
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Symbol
VCC
TS
STAT
VSS
CC
VCC1
SNS
BAT
I/O
I
I
O
—
O
I
I
I
Description
Supply voltage
Temperature sense input
Charge status output
Ground
Charge control output
Supply voltage
Current sense input
Voltage sense input
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
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
10/3/2006 REV:1.2
Email:
service@aimtron.com.tw
3
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