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PDF AT1457 Data sheet ( Hoja de datos )
| Número de pieza | AT1457 | |
| Descripción | 1-CELL LITHIUM AND LITHIUM POLYMER CHARGE MANAGEMENT IC | |
| Fabricantes | Aimtron Technology | |
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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: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
1
1 page  
CC PIN
Output low voltage
Sink current
AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
VOL(CC)
IO(CC)
IO(CC) = 5 mA (sink)
Not to exceed power
rating specification (PD)
--
5
-- 1.5 V
-- 40 mA
Figure 1: Typical Charge Profile
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: [email protected]
5
5 Page 
AT1457
Preliminary Product Information
1-Cell Lithium-Ion And Lithium-Polymer
Charge Management IC
4.Reverse Current Blocking Diode
(A) Transistor Circuit Application
When using the AT1457 with a PNP Transistor, a reverse-blocking diode is not
required because there is no current path from BAT to VIN. However, it is
advisable to still place a diode to the circuit. In the event where the input supply is
interrupted or removed during the constant current or constant voltage phases, the
battery under charge will discharge through the circuit pass transistor rendering it
impossible to turn off. If the circuit is unable to turn off, the reverse leakage will
discharge the battery. A Blocking diode will prevent this undesirable effect.
(B) MOSFET Circuit Application
An reverse blocking diode is required for the circuit show in Figure 3. The blocking
diode gives the system protection from a shorted input. It also prevent the leakage
current of battery when the input power is interrupted or removed.
5.Input Capacitor
It is good design practice to place a decoupling capacitor between VCC and VSS
pins. An input capacitor in the range of 0.1µF to 10µF is recommended. A larger
input capacitor in application will minimize switching or power bounce effects
when the power supply is “hot plugged” in.
6.Input Capacitor
The AT1457 does not need an output capacitor for stability of the device itself,
However, a capacitor connected between BAT and VSS will control the output
voltage when the AT1457 is powered up when no battery is connected. If a high
impedance load is placed across the BAT pin to VSS, the AT1457 can become
unstable. Such a case is possible with aging Li-Ion battery cells. As cells age
through repeated charge and discharge cycles, the internal impedance can rise over
time. A 10µF or larger output capacitor will compensate for the adverse effects of a
high impedance load and assure device stability over all operating conditions.
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: [email protected]
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AT1457.PDF ] | |
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