LTC4097 USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger

The LTC4097 is a standalone linear battery charger that is capable of charging a single-cell Li-Ion or Li-Polymer battery from both wall adapter and USB inputs. The charger can detect power at the inputs and automatically select the appropriate power source for charging.

No external sense resistor or blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The float voltage is fixed at 4.2V and the charge current is programmed with an external resistor. The LTC4097 terminates the charge cycle when the charge current drops below the user programmed termination threshold after the final float voltage is reached. The LTC4097 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µA even with power applied to both inputs.

Other features include trickle charge, automatic recharge, undervoltage lockout, charge status output, an NTC thermistor input used to monitor battery temperature and VNTC power present output with 120mA drive capability

产品特点 Features

Charges Single-Cell Li-Ion/Polymer Battery from Wall Adapter and USB Inputs
Automatic Input Detection (Wall Adapter Input has Charging Priority)
Charge Current Programmable up to 1.2A from Wall Adapter Input
Programmable Charge Current Termination
NTC Thermistor Input for Temperature Qualified Charging
Independent DC, USB Charge Current Programming
Preset Float Voltage with ±0.6% Accuracy
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
Charge Status Output
Automatic Recharge
20µA Charger Quiescent Current in Shutdown
Available in a Thermally Enhanced, Low Proﬁ le (0.75mm) 12-Lead (3mm × 2mm) DFN Package

应用

Cellular Telephones
MP3 Players
Portable Handheld Devices

典型应用图

参数

LTC4097 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) *
LTC4097EDDB#PBF	DFN	12	E	$2.23
LTC4097EDDB#TRMPBF	DFN	12	E	$2.23	$1.61
LTC4097EDDB#TRPBF	DFN	12	E	$2.23	$1.56

LTC4097 数据手册及相关资料下载

数据手册(英文) : LTC4097 - USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger.PDF
可靠性数据 : R540 Reliability Data .PDF
产品选型卡 : Energy Harvesting Portfolio.PDF