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LTC1773 PDF预览

LTC1773

更新时间： 2024-11-18 22:55:51
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
28页 373K
描述
No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking

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中文翻译

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LTC1773 数据手册

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LTC3808  
No RSENSETM, Low EMI,  
Synchronous DC/DC Controller  
with Output Tracking  
U
FEATURES  
DESCRIPTIO  
The LTC®3808 is a synchronous step-down switching  
regulator controller that drives external complementary  
power MOSFETs using few external components. The  
constantfrequencycurrentmodearchitecturewithMOSFET  
VDS sensing eliminates the need for a current sense  
resistor and improves efficiency.  
■
Programmable Output Voltage Tracking  
■
Sense Resistor Optional  
■
Spread Spectrum Modulation for Low Noise  
■
Constant Frequency Current Mode Operation for  
Excellent Line and Load Transient Response  
■
Wide VIN Range: 2.75V to 9.8V  
■
Wide VOUT Range: 0.6V to VIN  
Burst Mode operation provides high efficiency operation  
at light loads. 100% duty cycle provides low dropout  
operation, extending operating time in battery-powered  
systems.  
■
0.6V ±1.5% Reference  
■
Low Dropout Operation: 100% Duty Cycle  
■
True PLL for Frequency Locking or Adjustment  
(Frequency Range: 250kHz to 750kHz)  
Selectable Burst Mode®/Pulse Skipping/Forced  
■
Theswitchingfrequencycanbeprogrammedupto750kHz,  
allowing the use of small surface mount inductors and  
capacitors. For noise sensitive applications, the LTC3808  
can be externally synchronized from 250kHz to 750kHz.  
Burst Mode is inhibited during synchronization or when  
the SYNC/MODE pin is pulled low to reduce noise and RF  
interference.TofurtherreduceEMI,theLTC3808incorpo-  
rates a novel spread spectrum frequency modulation  
technique.  
Continuous Operation  
■
■
■
■
■
■
Auxiliary Winding Regulation  
Internal Soft-Start Circuitry  
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Micropower Shutdown: IQ = 9µA  
Tiny Thermally Enhanced Leadless (4mm × 3mm)  
DFN or 16-lead SSOP Package  
U
The LTC3808 is available in the tiny footprint thermally  
enhanced DFN package or 16-lead SSOP package.  
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode  
is a registered trademark of Linear Technology Corporation. No RSENSE is a trademark of  
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.  
APPLICATIO S  
■
One or Two Cell Lithium-Ion Powered Devices  
Notebook and Palmtop Computers, PDAs  
Portable Instruments  
Distributed DC Power Systems  
■
■
■
U
Efficiency and Power Loss vs Load Current  
TYPICAL APPLICATIO  
100  
90  
80  
70  
60  
50  
10k  
EFFICIENCY  
High Efficiency, 550kHz Step-Down Converter  
V
= 3.3V  
IN  
V
1k  
IN  
2.75V TO 9.8V  
V
= 4.2V  
IN  
V
IN  
= 5V  
10µF  
1M  
LTC3808  
V
IN  
+
100  
10  
PLLLPF  
SENSE  
SYNC/MODE  
PGOOD  
TYPICAL POWER  
LOSS (V = 4.2V)  
TG  
IN  
59k  
2.2µH  
47µF  
V
OUT  
V
SW  
2.5V  
2A  
FB  
15k  
+
1
I
TH  
BG  
187k  
FIGURE 11 CIRCUIT  
RUN  
IPRG  
220pF  
V
= 2.5V  
OUT  
GND  
0.1  
10k  
1
10  
100  
1k  
3808 TA01  
LOAD CURRENT (mA)  
3808 TA01b  
3808f  
1
1234567...28

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