AT1457 Aimtron Technology, AT1457 Datasheet
AT1457
Manufacturer Part Number
AT1457
Description
Manufacturer
Aimtron Technology
Datasheet
1.AT1457.pdf
(13 pages)
Specifications of AT1457
Case
MSOP/8
Date_code
04+
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT1457M
Manufacturer:
AIMTRON
Quantity:
20 000
Features
• Ideal for Single-Cell (4.2 V) and Li-Ion or
• Better Than ±1% Voltage Regulation Accuracy
• Optional Cell-Temperature Monitoring Before
• Integrated Voltage and Current Regulation With
• Charge Status Output for Single or Dual Led or
• Automatic Battery-Recharge Feature
• Charge Termination by Minimum Current
• Automatic Low-Power Sleep Mode When VCC
•Requires Small Number of External
• Packaging: 8-Pin MSOP
Applications
•1-Cell Lithium-Ion And Lithium-Polymer
• DSC
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
10/3/2006 REV:1.2
Charger
With Preset Voltages
and During Charge
Programmable Charge-Current and High or
Low-Side Current Sensing
Host Processor Interface
is Removed
Li-Pol Packs
Aimtron reserves the right without notice to change this circuitry and
Fax: 886-3-563-0879
Components
specifications.
1-Cell Lithium-Ion And Lithium-Polymer
1
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:
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.
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
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
automatically restarts the charge if the battery
voltage falls below the V
Preliminary Product Information
conditioning,
The
until
WWW:
conditioning
Email:
Charge Management IC
the
http://www.aimtron.com.tw
(RCH)
service@aimtron.com.tw
constant
(TERM)
battery
threshold.
charge
. The AT1457
AT1457
current,
reaches
rate
and
the
is
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