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LTC3455-1_15 PDF预览

LTC3455-1_15

更新时间： 2024-01-11 07:57:07
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
28页 343K
描述
Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger

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中文翻译

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LTC3455-1_15 数据手册

 浏览型号LTC3455-1_15的Datasheet PDF文件第2页浏览型号LTC3455-1_15的Datasheet PDF文件第3页浏览型号LTC3455-1_15的Datasheet PDF文件第4页浏览型号LTC3455-1_15的Datasheet PDF文件第5页浏览型号LTC3455-1_15的Datasheet PDF文件第6页浏览型号LTC3455-1_15的Datasheet PDF文件第7页 
LTC3455/LTC3455-1  
Dual DC/DC Converter  
with USB Power Manager  
and Li-Ion Battery Charger  
FEATURES  
DESCRIPTION  
The LTC®3455/LTC3455-1 are complete power manage-  
ment solutions for a variety of portable applications.  
These devices contain two synchronous step-down  
DC/DC converters, a USB power controller, a full-featured  
Li-Ion battery charger, a Hot Swap output, a low-battery  
indicator, and numerous internal protection features. The  
LTC3455/LTC3455-1 provide a small, simple solution for  
obtaining power from three different power sources: a  
single-cell Li-Ion battery, a USB port, and a wall adapter.  
Current drawn from the USB bus is accurately limited  
under all conditions. Whenever a USB or a wall adapter  
is present, the battery charger is enabled and all internal  
powerforthedeviceisdrawnfromtheappropriateexternal  
powersource.Alloutputsaredischargedtogroundduring  
shutdown to provide complete output disconnect. These  
devices are available in a 4mm × 4mm 24-pin exposed-  
pad QFN package.  
n
Seamless Transition between Input Power Sources:  
Li-Ion Battery, USB, and 5V Wall Adapter  
n
Accurate USB Current Limiting (500mA/100mA)  
n
Two High Efficiency DC/DC Converters: Up to 96%  
n
Thermal Regulation Maximizes Battery Charge  
Rate without Risk of Overheating  
n
Full-Featured Li-Ion Battery Charger with 4.2V Float  
Voltage for LTC3455 and 4.1V for LTC3455-1  
n
4.1V Float Voltage (LTC3455-1) Improves Battery Life  
and High Temperature Safety Margin  
n
Hot Swap™ Output for SDIO and Memory Cards  
Pin-Selectable Burst Mode® Operation  
n
n
Output Disconnect: All Outputs Discharged to Ground  
During Shutdown  
n
Available in a 4mm × 4mm × 0.75mm 24-Pin  
QFN Package  
APPLICATIONS  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 6522118.  
n
Handheld Computers  
n
Digital Cameras  
n
MP3 Players  
TYPICAL APPLICATION  
USB 5V  
1Ω  
USB  
MODE  
HSON  
ON2  
SUSPEND  
USB  
CONTROLLER  
5.6V  
4.7μF  
μC  
USBHP  
PWRON  
RST  
Efficiency  
WALL 5V  
V
MAX  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
1000  
100  
10  
PBSTAT  
SWITCHER 2  
= 3.3V  
10μF  
1Ω  
4.7μF  
V
OUT2  
1M  
1M  
ON/OFF  
LTC3455/LTC3455-1  
3.32k  
1.24k  
1k  
1.8V  
CHRG  
SWITCHER 1  
= 1.8V  
ON  
V
OUT1  
WALLFB  
0.1μF  
3.3V, HS  
1μF  
HSO  
TIMER  
PROG  
HSI  
2.49k  
POWER LOSS FOR  
BOTH OUTPUTS  
4.7μH  
3.3V  
0.5A  
SW2  
V
BAT  
10pF  
249k  
4.7μF  
1M  
SINGLE  
CELL Li-ION  
3.3V TO 4.2V  
V
= 3.6V  
BAT  
1.8V  
10μF  
FB2  
+
1
1000  
1
10  
100  
80.6k  
LOAD CURRENT (mA)  
LBO  
AO  
AI  
3455 TA01b  
4.7μH  
10pF  
V
BAT  
1.8V  
0.4A  
SW1  
2.49M  
100k  
10μF  
FB1  
806k  
80.6k  
GND  
3455 TA01a  
3455fc  
1
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中文翻译

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