AT1457 Datasheet, PDF (1/12 Pages) List of Unclassifed Manufacturers – 1-CELL LITHIUM AND LITHIUM POLYMER CHARGE MANAGEMENT IC

AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
Features
General Description
• Ideal for Single-Cell (4.1 V or 4.2 V) and Li-Ion The AT1457 series Lithium-Ion (Li-Ion) and
or Li-Pol Packs
Lithium-Polymer (Li-Pol) linear charge ICs are
• Better Than ±1% Voltage Regulation Accuracy designed for cost-sensitive and compact portable
With Preset Voltages
electronics. They combine high-accuracy current
• Optional Cell-Temperature Monitoring Before and voltage regulation, battery conditioning,
and During Charge
temperature monitoring, charge termination, and
• Integrated Voltage and Current Regulation With charge-status indication in a single 8-pin IC.
Programmable Charge-Current and High or MSOP package options are offered to fit a wide
Low-Side Current Sensing
range of end applications.
• Charge Status Output for Single or Dual Led or
Host Processor Interface
The AT1457 continuously measures battery
• Automatic Battery-Recharge Feature
temperature using an external thermistor. For
• Charge Termination by Minimum Current
safety, the AT1457 inhibits charge until the battery
• Automatic Low-Power Sleep Mode When VCC temperature is within user-defined thresholds.
is Removed
•Requires Small Number of External Components The AT1457 then charges the battery in three
• Packaging: 8-Pin MSOP
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
Applications
•1-Cell Lithium-Ion And Lithium-Polymer
Charger
• DSC
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.
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: [phone]
WWW: http://www.aimtron.com.tw
Fax: [phone]
Email: [e-mail]
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