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LTC3809EMSE-TRPBF PDF预览

LTC3809EMSE-TRPBF

更新时间： 2024-11-26 05:43:55
品牌 Logo 应用领域
凌特 - Linear 电阻器控制器
页数 文件大小 规格书
24页 286K
描述
No RSENSE™, Low EMI, Synchronous DC/DC Controller

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LTC3809EMSE-TRPBF 数据手册

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LTC3809  
No RSENSE™, Low EMI,  
Synchronous DC/DC Controller  
FEATURES  
DESCRIPTION  
TheLTC®3809isasynchronousstep-downswitchingregu-  
latorcontrollerthatdrivesexternalcomplementarypower  
MOSFETs using few external components. The constant  
n
No Current Sense Resistor Required  
n
Selectable Spread Spectrum Frequency Modulation  
for Low Noise Operation  
n
Constant Frequency Current Mode Operation for  
frequency current mode architecture with MOSFET V  
DS  
Excellent Line and Load Transient Response  
sensing eliminates the need for a current sense resistor  
n
True PLL for Frequency Locking or Adjustment  
and improves efficiency.  
(Frequency Range: 250kHz to 750kHz)  
Fornoisesensitiveapplications,theLTC3809canbeexter-  
nallysynchronizedfrom250kHzto750kHz. BurstModeis  
inhibitedduringsynchronizationorwhentheSYNC/MODE  
pin is pulled low to reduce noise and RF interference. To  
further reduce EMI, the LTC3809 incorporates a novel  
spread spectrum frequency modulation technique.  
n
Wide V Range: 2.75V to 9.8V  
IN  
OUT  
n
n
n
n
Wide V  
Range: 0.6V to V  
IN  
0.6V 1.5% Reference  
Low Dropout Operation: 100% Duty Cycle  
Selectable Burst Mode®/Pulse-Skipping/Forced  
Continuous Operation  
n
n
n
n
n
Burst Mode operation provides high efficiency operation  
at light loads. 100% duty cycle provides low dropout  
operation, extending operating time in battery-powered  
systems.  
Auxiliary Winding Regulation  
Internal Soft-Start Circuitry  
Output Overvoltage Protection  
Micropower Shutdown: I = 9μA  
Q
Tiny Thermally Enhanced Leadless (3mm × 3mm)  
Theswitchingfrequencycanbeprogrammedupto750kHz,  
allowing the use of small surface mount inductors and  
capacitors.  
DFN and 10-lead MSOP Packages  
APPLICATIONS  
The LTC3809 is available in tiny footprint thermally  
enhanced DFN and 10-lead MSOP packages.  
n
1- or 2-Cell Lithium-Ion Powered Devices  
Portable Instruments  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
n
No R  
is a trademark of Linear Technology Corporation.  
SENSE  
n
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.  
Distributed DC Power Systems  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Load Current  
100  
90  
80  
70  
60  
50  
10k  
EFFICIENCY  
High Efficiency, 550kHz Step-Down Converter  
V
IN  
= 3.3V  
1k  
V
IN  
2.75V TO 9.8V  
V
IN  
= 4.2V  
V
IN  
= 5V  
10μF  
LTC3809  
100  
10  
V
IN  
PLLLPF  
POWER LOSS  
= 4.2V  
SYNC/MODE TG  
V
IN  
59k  
2.2μH  
47μF  
V
2.5V  
2A  
OUT  
V
SW  
FB  
15k  
1
I
TH  
BG  
187k  
FIGURE 10 CIRCUIT  
RUN  
IPRG  
470pF  
V
OUT  
= 2.5V  
GND  
0.1  
10000  
1
10  
100  
1000  
LOAD CURRENT (mA)  
3809 TA01b  
3809 TA01  
3809fc  
1
1234567...24

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