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LTC3707

更新时间： 2023-12-20 18:46:27
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
32页 388K
描述
高效、两相同步降压型开关稳压器

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LTC3707 数据手册

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LTC3707  
High Efficiency, 2-Phase  
Synchronous Step-Down  
Switching Regulator  
DESCRIPTION  
FEATURES  
The LTC®3707 is a high performance dual step-down  
switching regulator controller that drives N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
current mode architecture allows adjustment of the  
frequency up to 300kHz. Power loss and noise due to the  
ESR of the input capacitors are minimized by operating  
the two controller output stages out of phase.  
■
180° Phased Dual Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
■
OUT  
■
1.5% Output Voltage Accuracy over Temperature  
■
Dual N-Channel MOSFET Synchronous Drive  
■
Power Good Output Voltage Monitor  
■
DC Programmed Fixed Frequency 150kHz to 300kHz  
■
Wide V Range: 4.5V to 28V Operation  
IN  
OPTI-LOOPcompensationallowsthetransientresponseto  
be optimized over a wide range of output capacitance and  
ESR values. The precision 0.8V reference and power good  
outputindicatorarecompatiblewithfuturemicroprocessor  
generations, and a wide 3.5V to 30V input supply range  
encompasses all battery chemistries.  
■
■
■
■
■
■
■
■
■
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Remote Output Voltage Sense  
A RUN/SS pin for each controller provides both soft-start  
and optional timed, short-circuit shutdown. Current  
foldback limits MOSFET dissipation during short-circuit  
conditions when overcurrent latchoff is disabled. Output  
overvoltage protection circuitry latches on the bottom  
Low Shutdown I : 20μA  
Q
5V and 3.3V Standby Regulators  
Selectable Constant Frequency, Burst Mode®  
Operation or PWM Operation  
■
Small 28-Lead Narrow SSOP Package  
MOSFET until V  
returns to normal. The FCB mode  
OUT  
APPLICATIONS  
pin can select among Burst Mode operation, constant  
frequency mode and continuous inductor current mode  
or regulate a secondary winding.  
■
Notebook and Palmtop Computers, PDAs  
■
Battery Chargers  
■
Portable Instruments  
L, LT, LTC, LTM, Burst Mode, and OPTI-LOOP are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.  
Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6304066, 6580258.  
■
Battery-Operated Digital Devices  
■
DC Power Distribution Systems  
V
IN  
5.2V TO 28V  
C
22μF  
50V  
TYPICAL APPLICATION  
IN  
+
1μF  
4.7μF  
D3  
CERAMIC  
D4  
V
INTV  
IN  
CC  
CERAMIC  
M1  
M2  
M3  
M4  
TG1  
TG2  
L1  
6.3μH  
L2  
6.3μH  
C
, 0.1μF  
C
, 0.1μF  
B2  
B1  
BOOST1  
SW1  
BOOST2  
SW2  
LTC3707  
BG1  
BG2  
D1  
D2  
SGND  
SENSE1  
PGND  
+
+
SENSE2  
R
R
SENSE1  
SENSE2  
0.01Ω  
1000pF  
1000pF  
0.01Ω  
–
–
SENSE1  
SENSE2  
V
V
3.3V  
5A  
OUT1  
5V  
5A  
OUT2  
V
V
OSENSE2  
OSENSE1  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH1  
TH2  
C
C
C2  
C
C1  
220pF  
C
56μF  
6V  
OUT1  
OUT  
RUN/SS1  
RUN/SS2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
220pF  
R
C2  
47μF  
6V  
R
C1  
C
C
SS2  
0.1μF  
SS1  
0.1μF  
15k  
15k  
SP  
SP  
M1, M2, M3, M4: FDS6680A  
3707 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
3707fb  
1
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