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AT1457 Datasheet

  • AT1457

  • 1-CELL LITHIUM AND LITHIUM POLYMER CHARGE MANAGEMENT IC

  • 287.79KB

  • 12頁

  • ETC

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AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Features
鈥?Ideal for Single-Cell (4.1 V or 4.2 V) and Li-Ion
or Li-Pol Packs
鈥?Better Than
鹵1%
Voltage Regulation Accuracy
With Preset Voltages
鈥?Optional Cell-Temperature Monitoring Before
and During Charge
鈥?Integrated Voltage and Current Regulation With
Programmable Charge-Current and High or
Low-Side Current Sensing
鈥?Charge Status Output for Single or Dual Led or
Host Processor Interface
鈥?Automatic Battery-Recharge Feature
鈥?Charge Termination by Minimum Current
鈥?Automatic Low-Power Sleep Mode When VCC
is Removed
鈥equires Small Number of External
Components
鈥?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
鹵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
鈥?-Cell Lithium-Ion And Lithium-Polymer
Charger
鈥?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

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