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LTC3704

更新时间： 2024-11-07 14:57:51
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
28页 325K
描述
宽输入范围、No RSENSE? 宽输入范围、正至负 DC/DC 控制器

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中文翻译

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LTC3704 数据手册

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LTC3704  
TM  
SENSE  
Wide Input Range, No R  
Positive-to-Negative DC/DC Controller  
U
FEATURES  
DESCRIPTIO  
The LTC®3704 is a wide input range, current mode,  
positive-to-negative DC/DC controller that drives an  
N-channel power MOSFET and requires very few external  
components.Intendedforlowtohighpowerapplications,  
it eliminates the need for a current sense resistor by  
utilizingthepowerMOSFET’son-resistance,therebymaxi-  
mizing efficiency.  
■
High Efficiency Operation (No Sense  
Resistor Required)  
■
Wide Input Voltage Range: 2.5V to 36V  
Current Mode Control Provides Excellent Transient  
Response  
■
■
■
■
■
■
High Maximum Duty Cycle (Typ 92%)  
±1% Internal Voltage Reference  
±2% RUN Pin Threshold with 100mV Hysteresis  
Micropower Shutdown: IQ = 10μA  
The IC’s operating frequency can be set with an external  
resistorovera50kHzto1MHzrange, andcanbesynchro-  
nized to an external clock using the MODE/SYNC pin.  
Burst Mode operation at light loads, a low minimum  
operating supply voltage of 2.5V and a low shutdown  
quiescent current of 10μA make the LTC3704 ideally  
suited for battery-operated systems.  
Programmable Switching Frequency  
(50kHz to 1MHz) with One External Resistor  
Synchronizable to an External Clock Up to 1.3 × fOSC  
User-Controlled Pulse Skip or Burst Mode® Operation  
Internal 5.2V Low Dropout Voltage Regulator  
Capable of Operating with a Sense Resistor for High  
Output Voltage Applications (VDS >36V)  
■
■
■
■
For applications requiring constant frequency operation,  
the Burst Mode operation feature can be defeated using  
the MODE/SYNC pin. Higher than 36V switch voltage  
applicationsarepossiblewiththeLTC3704byconnecting  
the SENSE pin to a resistor in the source of the power  
MOSFET.  
■
Small 10-Lead MUSOP Package  
APPLICATIO S  
■
SLIC Power Supplies  
Telecom Power Supplies  
■
The LTC3704 is available in the 10-lead MSOP package.  
■
Portable Electronic Equipment  
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation. Burst  
■
Cable and DSL Modems  
Mode is a registered trademark of Linear Technology Corporation. No R  
is a  
SENSE  
■
registered trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 5847554, 5731694.  
Router Supplies  
U
TYPICAL APPLICATIO  
V
IN  
5V to 15V  
•
Conversion Efficiency  
R1  
1M  
L1*  
V
OUT  
100  
90  
80  
70  
60  
50  
40  
30  
20  
–5.0V  
•
3A to 5A  
RUN  
SENSE  
L2*  
C
V
IN  
= 5V  
DC  
47μF  
I
TH  
V
IN  
LTC3704  
INTV  
V
IN  
= 15V  
R
C
NFB  
C
OUT  
CC  
3k  
100μF  
M1  
FREQ  
GATE  
GND  
(X2)  
V
IN  
= 10V  
MODE/SYNC  
D1  
C
C1  
4.7nF  
R
80.6k  
1%  
T
C
C
VCC  
4.7μF  
IN  
47μF  
GND  
R
3.65k  
1%  
R
1.21k  
1%  
FB2  
FB1  
3704 TA01  
0.001  
10  
0.01  
0.1  
1.0  
OUTPUT CURRENT (A)  
C
, C : TDK C5750X5R1C476M  
D1: MBRD835L (ON SEMICONDUCTOR)  
L1, L2: BH ELECTRONICS BH510-1009  
M1: Si4884 (SILICONIX/VISHAY)  
3704 TA01b  
IN DC  
C
OUT  
C
VCC  
: TDK C5750X5R0J107M  
: TAIYO YUDEN LMK316BJ475ML  
Figure 1. High Efficiency Positive to Negative Supply  
3704fb  
1
1234567...28

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