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LTC3555EUFD-3-PBF PDF预览

LTC3555EUFD-3-PBF

更新时间： 2024-11-11 05:43:55
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
32页 294K
描述
High Effi ciency USB Power Manager + Triple Step-Down DC/DC

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中文翻译

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LTC3555EUFD-3-PBF 数据手册

 浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第2页浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第3页浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第4页浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第5页浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第6页浏览型号LTC3555EUFD-3-PBF的Datasheet PDF文件第7页 
LTC3555/LTC3555-X  
High Efficiency USB Power  
Manager + Triple  
Step-Down DC/DC  
DESCRIPTION  
FEATURES  
The LTC®3555 family are highly integrated USB com-  
patible power management and battery charger ICs for  
Li-Ion/Polymer battery applications. They include a high  
efficiency current limited switching PowerPath manager  
withautomaticloadprioritization,abatterycharger,anideal  
diode and three general purpose synchronous step-down  
switching regulators.  
Power Manager  
n
High Efficiency Switching PowerPath™ Controller  
with Bat-Track™ Adaptive Output Control  
n
Programmable USB or Wall Current Limit  
(100mA/500mA/1A)  
n
Full Featured Li-Ion/Polymer Battery Charger  
n
1.5A Maximum Charge Current  
n
Internal 180mΩ Ideal Diode + External Ideal Diode  
The LTC3555 family limits input current to either 100mA  
or 500mA for USB applications or 1A for adapter-powered  
applications. Unlike linear chargers, the LTC3555 family’s  
switchingarchitecturetransmitsnearlyallofthepoweravail-  
able from the USB port to the load with minimal loss and  
heat which eases thermal constraints in small spaces.  
Controller Powers Load in Battery Mode  
n
Low No-Load Quiescent Current when Powered from  
BAT (<32μA)  
DC/DCs  
n
Triple High Efficiency Step-Down DC/DCs  
(1A/400mA/400mA I  
)
OUT  
Two of the three general purpose switching regulators can  
provide up to 400mA and the third can deliver 1A. The  
n
n
n
n
n
All Regulators Operate at 2.25MHz  
Dynamic Voltage Scaling on Two Outputs  
2
entire product can be controlled via I C or simple I/O. The  
2
I C or Independent Enable, V  
Controls  
OUT  
LTC3555-1/LTC3555-3 versions offer “instant-on” power  
deliverytotheportableproductevenwithaverylowbattery  
voltage.TheLTC3555-3versionalsohasareducedcharger  
float voltage of 4.100V for battery safety and longevity.  
Low No-Load Quiescent Current: 20μA  
28-Pin (4mm × 5mm × 0.75mm) QFN Package  
APPLICATIONS  
The LTC3555 family is available in the low profile 28-pin  
(4mm × 5mm × 0.75mm) QFN surface mount package.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath  
and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents, including 6522118 and 6404251.  
n
HDD-Based MP3 Players, PDAs, GPS, PMPs  
n
Portable Medical Products  
n
Handheld Instrumentation  
Other USB-Based Handheld Products  
n
TYPICAL APPLICATION  
High Efficiency PowerPath Manager and Triple Step-Down Regulator  
Switching Regulator Efficiency to  
USB/WALL  
4.35V TO 5.5V  
TO OTHER  
LOADS  
USB COMPLIANT  
STEP-DOWN  
REGULATOR  
System Load (POUT/PBUS  
)
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
CC/CV  
BATTERY  
CHARGER  
0V  
OPTIONAL  
CURRENT  
CONTROL  
BAT = 4.2V  
BAT = 3.3V  
CHARGE  
+
Li-Ion  
T
LTC3555/LTC3555-X  
3.3V/25mA  
RTC/LOW  
ALWAYS ON LDO  
1
POWER LOGIC  
0.8V TO 3.6V/400mA  
0.8V TO 3.6V/400mA  
MEMORY  
I/O  
TRIPLE  
5
HIGH EFFICIENCY  
STEP-DOWN  
V
I
= 5V  
ENABLE  
CONTROLS  
BUS  
= 0mA  
2
3
BAT  
0.8V TO 3.6V/1A  
SWITCHING  
10x MODE  
CORE  
μPROCESSOR  
0
REGULATORS  
RST  
0.01  
0.1  
(A)  
1
2
I
2
2
OUT  
I C  
I C PORT  
3555 TA01b  
3555 TA01  
3555fd  
1
1234567...32

中文翻译

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