The AT1457 series Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge ICs are designed for costsensitive 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 op-tions are offered to fit a wide range of end applications.
The AT1457 continuously measures battery temperature using an external thermistor. For safety, the AT1457 inhi-bits 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 chargeregulation 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 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.
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•1-Cell Lithium-Ion And Lithium-Polymer Charger• DSC
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• Ideal for Single-Cell (4.1 V or 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
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Parameter |
Symbol |
Condition |
Rated Value |
Unit |
|
Min. |
Max. |
| Power supply voltage |
VCC |
- |
-0.3 |
+8 |
V |
| Imput voltage |
V(BAT) |
- |
-0.3 |
VCC+0.3 |
V |
|
V(SNS) |
- |
-0.3 |
VCC+0.3 |
V |
|
V(TS) |
- |
-0.3 |
VCC+0.3 |
V |
| Sink current (STAT pin) |
IOL |
not to exceed PD |
- |
20 |
mA |
| Source current (STAT pin) |
IOH |
not to exceed PD |
- |
10<
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File Size: 294432 KB
Manufacturer: ETC [ETC]
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