AT1457, AT1457A1, AT1457M Selling Leads, Datasheet
MFG:CHARGEM Package Cooled:SOP D/C:04+
AT1457, AT1457A1, AT1457M Datasheet download
Part Number: AT1457
MFG: CHARGEM
Package Cooled: SOP
D/C: 04+
AT1457, AT1457A1, AT1457M
- Table of contents:
Info of AT1457
Info of AT1457A1
Info of AT1457M
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About AT1457
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Datasheet: AT1457
File Size: 294432 KB
Manufacturer: ETC [ETC]
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About AT1
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Datasheet: AT1
File Size: 55024 KB
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About AT1
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Datasheet: AT1
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AT1457 General Description
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.
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.
AT1457 Maximum Ratings
|
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 |
mA |
| Output current (CC pin) |
IO(CC) |
not to exceed PD |
- |
40 |
mA |
| Total power dissipation |
PD |
at 25 |
- |
300 |
mW |
| Operating free-air temperature range |
TA |
- |
-20 |
+85 |
|
| Storage temperature range |
Tstg |
- |
-40 |
+125 |
|
| Lead temperature |
TL |
soldering, 10 s |
- |
300 |
|
AT1457 Features
• 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
• 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
AT1457 Typical Application
•1-Cell Lithium-Ion And Lithium-Polymer Charger
• DSC
• DSC
AT1457 Connection Diagram
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