LTC3550 Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

The LTC3550 is a standalone linear charger with a 600mA monolithic synchronous buck converter. It is capable of charging a single-cell Li-Ion battery from both wall adapter and USB inputs. The charger automatically selects the appropriate power source for charging.

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 currents are programmed with external resistors. The LTC3550 terminates the charge cycle when the charge current drops below the programmed termination threshold after the ﬁnal ﬂoat voltage is reached. With power applied to both inputs, the LTC3550 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.

The DC/DC converter switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors

产品特点 Features

Charges Single-Cell Li-Ion Battery from Wall Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable Up to 950mA from Wall Adapter Input
Adjustable Output, High Efﬁciency 600mA Synchronous DC/DC Converter
No External MOSFET, Sense Resistor or Blocking Diode Needed
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating
Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
1.5MHz Constant Frequency Operation (Step-Down Converter)
18μA USB Suspend Current in Shutdown
“Power Present” Status Output
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Proﬁle (0.75mm) 16-Lead (5mm × 3mm) DFN Package

应用

Cellular Telephones

典型应用图

参数

LTC3550 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) *
LTC3550EDHC	DFN	16	E	$2.86	$2.00
LTC3550EDHC#PBF	DFN	16	E	$2.86	$2.00
LTC3550EDHC#TR	DFN	16	E		$2.06
LTC3550EDHC#TRPBF	DFN	16	E		$2.06
LTC3550EDHC-1	DFN	16	E	$2.86	$2.00
LTC3550EDHC-1#PBF	DFN	16	E	$2.86	$2.00
LTC3550EDHC-1#TR	DFN	16	E		$2.06
LTC3550EDHC-1#TRPBF	DFN	16	E		$2.06

LTC3550 数据手册及相关资料下载

数据手册(英文) : LTC3550 - Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter.PDF
可靠性数据 : R402 Reliability Data .PDF