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LTC3555

更新时间： 2024-11-12 14:57:31
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
34页 380K
描述
高效率 USB 电源管理器 + 三路降压型 DC/DC

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中文翻译

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LTC3555 数据手册

 浏览型号LTC3555的Datasheet PDF文件第2页浏览型号LTC3555的Datasheet PDF文件第3页浏览型号LTC3555的Datasheet PDF文件第4页浏览型号LTC3555的Datasheet PDF文件第5页浏览型号LTC3555的Datasheet PDF文件第6页浏览型号LTC3555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  
switching architecture transmits nearly all of the power  
available 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  
2
Dynamic Voltage Scaling on Two Outputs  
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.  
n
HDD-Based MP3 Players, PDAs, GPS, PMPs  
n
L, LT, LTC, LTM Linear Technology, the Linear logo and Burst Mode are registered trademarks  
and 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.  
Portable Medical Products  
Handheld Instrumentation  
n
n
Other USB-Based Handheld Products  
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  
3555fe  
1
For more information www.linear.com/LTC3555  
1234567...34

中文翻译

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