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LTC3550 PDF预览

LTC3550

更新时间： 2023-12-20 18:44:49
品牌 Logo 应用领域
亚德诺 - ADI 电池转换器
页数 文件大小 规格书
24页 320K
描述
具 600mA 降压型转换器的双输入 USB / AC 适配器锂离子电池充电器

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中文翻译

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LTC3550 数据手册

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LTC3550  
Dual Input USB/AC Adapter  
Li-Ion Battery Charger with  
600mA Buck Converter  
U
DESCRIPTIO  
FEATURES  
TheLTC®3550isastandalonelinearchargerwitha600mA  
monolithic synchronous buck converter. It is capable of  
chargingasingle-cellLi-Ionbatteryfrombothwalladapter  
and USB inputs. The charger automatically selects the  
appropriate power source for charging.  
■
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  
Internal thermal feedback regulates the battery charge  
currenttomaintainaconstantdietemperatureduringhigh  
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.  
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 0.6ꢀ 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  
■
■
■
The DC/DC converter switching frequency is internally  
set at 1.5MHz, allowing the use of small surface mount  
inductors and capacitors.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
*Protected by U.S. patents, includng 6522118, 6700364, 6580258, 5481178, 6304066,  
6127815, 6498466, 6611131  
Available in a Thermally Enhanced, Low Profile  
(0.75mm) 16-LeUad (5mm × 3mm) DFN Package  
APPLICATIO S  
■
Cellular Telephones  
U
TYPICAL APPLICATIO  
Complete Charge Cycle  
(1100mA Battery)  
1000  
800  
Dual Input Battery Charger and DC/DC Converter  
600  
2.2µH  
V
OUT  
400  
200  
0
4.2  
4.0  
3.8  
3.6  
3.4  
1.2V  
SW  
600mA  
C
OUT  
10µF  
CONSTANT VOLTAGE  
USBIN = 5V  
LTC3550  
22pF  
301k  
301k  
CER  
WALL  
DCIN  
V
FB  
ADAPTER  
RUN  
T
= 25°C  
A
IDC  
IUSB  
USB  
PORT  
R
R
= 1.24k  
800mA (WALL)  
500mA (USB)  
USBIN  
IUSB  
IDC  
V
CC  
= 2k  
1µF  
BAT  
5.0  
2.5  
0
2k  
1%  
4.7µF  
ITERM  
4.2V  
+
1µF  
GND  
2k  
1%  
1.24k  
1%  
SINGLE-CELL  
Li-Ion BATTERY  
0
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
TIME (HR)  
3550 TA01  
3550 TA02  
3550fa  
1
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中文翻译

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