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LTC3809-1 PDF预览

LTC3809-1

更新时间： 2024-11-23 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 255K
描述
No RSENSETM, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking

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中文翻译

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LTC3809-1 数据手册

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LTC3809-1  
No RSENSETM, Low Input  
Voltage, Synchronous DC/DC  
Controller with Output Tracking  
FEATURES  
DESCRIPTION  
The LTC®3809-1 is a synchronous step-down switching  
regulator controller that drives external complementary  
power MOSFETs using few external components. The  
constantfrequencycurrentmodearchitecturewithMOSFET  
n
Programmable Output Voltage Tracking  
n
No Current Sense Resistor Required  
n
Constant Frequency Current Mode Operation for  
Excellent Line and Load Transient Response  
n
Wide V Range: 2.75V to 9.8V  
V
sensingeliminatestheneedforacurrentsenseresistor  
IN  
DS  
n
Wide V  
Range: 0.6V to V  
and improves efficiency.  
OUT  
IN  
n
n
n
0.6V 1.5% Reference  
Optional Burst Mode operation provides high efficiency  
operation at light loads. 100% duty cycle provides low  
dropout operation, extending operating time in battery-  
poweredsystems.BurstModeisinhibitedwhentheMODE  
pin is pulled low to reduce noise and RF interference.  
Low Dropout Operation: 100% Duty Cycle  
Selectable Burst Mode®/Pulse-Skipping/Forced  
Continuous Operation  
Auxiliary Winding Regulation  
Internal Soft-Start Circuitry  
n
n
n
n
n
n
The LTC3809-1 allows either coincident or ratiometric  
output voltage tracking. Switching frequency is fixed at  
550kHz. Fault protection is provided by an overvoltage  
comparator and a short-circuit current limit comparator.  
Selectable Maximum Peak Current Sense Threshold  
Output Overvoltage Protection  
Micropower Shutdown: I = 9μA  
Q
Tiny Thermally Enhanced Leadless (3mm × 3mm)  
DFN and 10-lead MSOP Packages  
The LTC3809-1 is available in tiny footprint thermally  
enhanced DFN and 10-lead MSOP packages.  
APPLICATIONS  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst  
is a registered trademark of Linear Technology Corporation. No R  
Linear Technology Corporation. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066,  
5847554, 6611131, 6498466. Other Patents pending.  
n
is a trademark of  
SENSE  
1- or 2-Cell Lithium-Ion Powered Devices  
n
Notebook and Palmtop Computers, PDAs  
n
Portable Instruments  
Distributed DC Power Systems  
n
TYPICAL APPLICATION  
Efficiency and Power Loss vs Load Current  
High Efficiency, 550kHz Step-Down Converter  
100  
90  
80  
70  
60  
50  
10k  
EFFICIENCY  
V
IN  
2.75V TO 9.8V  
V
= 3.3V  
IN  
10μF  
1k  
V
IN  
IPRG  
V
= 4.2V  
V
= 5V  
IN  
IN  
100  
10  
MODE  
TG  
59k  
LTC3809-1  
2.2μH  
47μF  
V
2.5V  
2A  
OUT  
TYPICAL POWER  
LOSS (V = 4.2V)  
V
SW  
BG  
FB  
15k  
IN  
I
TH  
187k  
RUN  
470pF  
1
GND  
FIGURE 8 CIRCUIT  
V
= 2.5V  
OUT  
38091 TA01  
0.1  
10k  
1
10  
100  
1k  
LOAD CURRENT (mA)  
38091 TA02  
38091fc  
1
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