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LTC3100 PDF预览

LTC3100

更新时间： 2024-11-13 05:43:51
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
24页 411K
描述
1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

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中文翻译

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LTC3100 数据手册

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LTC3100  
1.5MHz Synchronous Dual  
Channel DC/DC Converter  
and 100mA LDO  
FEATURES  
DESCRIPTION  
The LTC®3100 combines a high efficiency 700mA syn-  
chronous step-up converter, a 250mA synchronous  
step-down converter and a 100mA LDO regulator. The  
LTC3100 features a wide input voltage range of 0.65V to  
5V.Thestep-downconvertercanbepoweredbytheoutput  
of the step-up converter or from a separate power source  
between 1.8V and 5.5V. The LDO can also be used as a  
sequencing switch on the output of the boost.  
n
Extremely Compact Triple-Rail Solution  
Burst Mode® Operation, I = 15μA  
n
Q
n
1.5MHz Fixed Frequency Operation  
n
Power Good Indicators  
n
700mA Synchronous Step-Up DC/DC  
0.65V to 5V V Range  
IN  
1.5V to 5.25V V  
Range  
OUT  
94% Peak Efficiency  
V > V  
Operation  
IN  
OUT  
Aswitchingfrequencyof1.5MHzminimizessolutionfoot-  
print by allowing the use of tiny, low profile inductors and  
ceramic capacitors. The switching regulators use current  
mode control and are internally compensated, reducing  
external parts count. Each converter automatically transi-  
tions to Burst Mode operation to maintain high efficiency  
over the full load range. Burst Mode operation can be  
disabled for low noise applications. The integrated LDO  
provides a third low noise, low dropout supply.  
Output Disconnect  
n
n
n
250mA Synchronous Step-Down DC/DC  
1.8V to 5.5V V Range  
IN  
OUT  
0.6V to 5.5V V  
Range  
LDO (V Internally Tied to V  
)
BST  
IN  
0.6V to 5.25V V  
Range  
OUT  
200mV Dropout Voltage at 100mA  
Available in a 16-Lead 3mm × 3mm QFN Package  
Anti-ringing circuitry reduces EMI by damping the boost  
inductor in discontinuous mode. Additional features  
include shutdown current of under 1μA and overtem-  
perature shutdown. The LTC3100 is housed in a 16-lead  
3mm × 3mm 0.75mm QFN package.  
APPLICATIONS  
n
Bar Code Readers  
Medical Instruments  
n
n
Low Power Portable Electronic Devices  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Load Current, VIN = 2.4V  
Two-Cell, Triple Output Converter  
3.3μH  
3.3V AT 100mA  
BOOST  
V
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
10μF  
1.87M  
1.07M  
V
BATT  
SWBST  
V
V
BST  
1M  
INBK  
s2  
1.6V TO 3.2V  
V
FBBST  
INBST  
2.2μF  
BOOST_GOOD  
3V AT 50mA  
LTC3100  
PGBST  
V
V
LDO  
LDO  
102k  
2.2μF  
10μF  
1
FBLDO  
25.5k  
BOOST  
FF EN_BURST  
MODE  
0.1  
0.01  
BUCK  
4.7μH  
1.8V AT 200mA  
V
PL, BOOST  
PL, BUCK  
SWBK  
FBBK  
BUCK  
OFF ON  
BOOST  
RUNBST  
RUNLDO  
RUNBK  
2M  
1M  
0.01  
0.1  
1
10  
100  
1000  
OFF ON  
LDO  
1M  
LOAD CURRENT (mA)  
3100 TA01b  
OFF ON  
BUCK  
GND  
PGBK  
3100 TA01a  
BUCK_GOOD  
3100fa  
1
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中文翻译

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