LTC4068-4.2 Standalone linear Li-Ion Battery Charger with Programmable Termination

The LTC®4068 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC4068 ideally suited for portable applications. Furthermore, the LTC4068 is designed to work within USB power specifications.

No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The charge voltage is fixed at 4.2V and the charge current is programmed with a resistor. The LTC4068 terminates the charge cycle when the charge current drops below the programmed termination threshold after the final float voltage is reached.

When the input supply (wall adapter or USB supply) is removed, the LTC4068 enters a low current state dropping the battery drain current to less than 2µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and status pins to indicate charge termination and the presence of adequate input voltage.

Protected by U.S. Patents, including 6522118

产品特点 Features

Programmable Charge Current Up to 950mA
Complete linear Charger in DFN Package
No MOSFET, Sense Resistor or Blocking Diode Required
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
Charges Directly from a USB Port
Programmable Charge Current Termination
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
“AC Present” Output
2.9V Trickle Charge Threshold (LTC4068)
Available Without Trickle Charge (LTC4068X)
Soft-Start Limits Inrush Current
Low Profile (3mm x 3mm x 0.75mm) DFN Package

应用

Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications

典型应用图

参数

LTC4068-4.2 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC4068EDD-4.2	DFN	8	E	$2.41	$1.70
LTC4068EDD-4.2#PBF	DFN	8	E	$2.41	$1.70
LTC4068EDD-4.2#TR	DFN	8	E		$1.80
LTC4068EDD-4.2#TRPBF	DFN	8	E		$1.80
LTC4068XEDD-4.2	DFN	8	E	$2.41	$1.70
LTC4068XEDD-4.2#PBF	DFN	8	E	$2.41	$1.70
LTC4068XEDD-4.2#TR	DFN	8	E		$1.80
LTC4068XEDD-4.2#TRPBF	DFN	8	E		$1.80

LTC4068-4.2 数据手册及相关资料下载

数据手册(英文) : LTC4068-4.2/LTC4068X-4.2 - Standalone linear Li-Ion Battery Charger with Programmable Termination.PDF
可靠性数据 : R402 Reliability Data .PDF
可靠性数据 : R421 Reliability Data .PDF
产品选型卡 : I2C Battery Gas Gauges.PDF