LTC3552-1 Standalone linear Li-Ion Battery Charger and Dual Synchronous Buck Converter

The LTC3552-1 is a complete constant-current/constantvoltage linear charger and dual fi xed output DC/DC converter for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC3552-1 ideally suited for portable applications. Furthermore, the LTC3552-1 is designed to work within USB power specifi cations.

No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. The charge voltage is fixed at 4.2V and the charge current is programmed with a resistor. The charge cycle terminates 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 LTC3552-1 enters a low current state dropping the battery drain current to less than 2μA. Thermal regulation maximizes charge rate without risk of overheating.

The synchronous step-down switching regulators generate fi xed output voltages of 1.8V and 1.575V. The switching frequency is set at 2.25MHz, allowing the use of small surface mount inductors and capacitors

产品特点 Features

Programmable Charge Current Up to 950mA
Complete linear Charger and Dual DC/DC Regulator
Dual Fixed Outputs:
1.8V at 800mA
1.575V at 400mA
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
“Power Present” Output
Soft-Start Limits Inrush Current
Low Quiescent Current Buck Converter (40μA)
Current Mode Operation, Constant Frequency (2.25MHz)
Low Profi le (5mm × 3mm × 0.75mm) DFN Package

应用

Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications

典型应用图

参数

LTC3552-1 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) *
LTC3552EDHC	DFN	16	E	$2.86	$2.00
LTC3552EDHC#PBF	DFN	16	E	$2.86	$2.00
LTC3552EDHC#TR	DFN	16	E		$2.06
LTC3552EDHC#TRPBF	DFN	16	E		$2.06
LTC3552EDHC-1	DFN	16	E	$2.86	$2.00
LTC3552EDHC-1#PBF	DFN	16	E	$2.86	$2.00
LTC3552EDHC-1#TR	DFN	16	E		$2.06
LTC3552EDHC-1#TRPBF	DFN	16	E		$2.06

LTC3552-1 数据手册及相关资料下载

数据手册(英文) : LTC3552-1 - Standalone linear Li-Ion Battery Charger and Dual Synchronous Buck Converter.PDF
可靠性数据 : R419 Reliability Data .PDF