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AT1457
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MFG:AIMTRON Package Cooled:MSOP/8

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Part Number: AT1457

MFG: AIMTRON

Package Cooled: MSOP/8

Description: The AT1457 series Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge ICs are designed for costsensitive an...

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.

AT1457 Maximum Ratings

Parameter	Symbol	Condition	Rated Value		Unit
Parameter	Symbol	Condition	Min.	Max.	Unit
Power supply voltage	V_CC	-	-0.3	+8	V
Imput voltage	V_(BAT)	-	-0.3	V_CC+0.3	V
	V_(SNS)	-	-0.3	V_CC+0.3	V
	V_(TS)	-	-0.3	V_CC+0.3	V
Sink current (STAT pin)	I_OL	not to exceed P_D	-	20	mA
Source current (STAT pin)	I_OH	not to exceed P_D	-	10	mA
Output current (CC pin)	I_O(CC)	not to exceed P_D	-	40	mA
Total power dissipation	P_D	at 25	-	300	mW
Operating free-air temperature range	T_A	-	-20	+85
Storage temperature range	T_stg	-	-40	+125
Lead temperature	T_L	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

AT1457 Typical Application

•1-Cell Lithium-Ion And Lithium-Polymer Charger
• DSC

AT1457 Connection Diagram

AT1457 datasheet

AT1457
PDF/DataSheet Download

Datasheet: AT1457
File Size: 294432 KB
Manufacturer: ETC [ETC]
Click here to Download

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