LTC4077 Dual Input Standalone Battery Charger

The LTC®4077 is a standalone linear charger that is capable of charging a single-cell Li-Ion 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 LTC4077 terminates the charge cycle when the charge current drops below the termination threshold after the ﬁnal ﬂoat voltage is reached. The LTC4077 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 automatic recharge, undervoltage lockout, charge status output, power present status output to indicate the presence of wall adapter or USB power and high power/low power adjustable mode for USB compatible applications

产品特点 Features

Charges Single-Cell Li-Ion Batteries from Wall
Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable up to 950mA from Wall Adapter Input
C/10 Charge Current Termination
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
Preset Charge Voltage with ±0.6% Accuracy
18µA USB Suspend Current in Shutdown
Power Present Status Output
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Proﬁ le (0.75mm) 10-Lead (3mm × 3mm) DFN Package

应用

Cellular Telephones
Handheld Computers
Portable MP3 Players
Digital Cameras

典型应用图

参数

LTC4077 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) *
LTC4077EDD	DFN	10	E	$2.67	$1.88
LTC4077EDD#PBF	DFN	10	E	$2.67	$1.88
LTC4077EDD#TR	DFN	10	E		$1.98
LTC4077EDD#TRPBF	DFN	10	E		$1.98

LTC4077 数据手册及相关资料下载

数据手册(英文) : LTC4077 - Dual Input Standalone Li-Ion Battery Charger.PDF
可靠性数据 : R402 Reliability Data .PDF
产品选型卡 : Energy Harvesting Portfolio.PDF