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LTC3707IGN-SYNC-PBF

更新时间： 2024-09-24 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
32页 399K
描述
High Effi ciency, 2-Phase Synchronous Step-Down Switching Regulator

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LTC3707IGN-SYNC-PBF 数据手册

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LTC3707-SYNC  
High Efficiency, 2-Phase  
Synchronous Step-Down Switching Regulator  
FEATURES  
DESCRIPTION  
TheLTC®3707-SYNCisahighperformancedualstep-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
currentmodearchitectureallowsphase-lockablefrequency  
of 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.  
n
180° Phased Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
OUT  
Dual N-Channel MOSFET Synchronous Drive  
1.5% Output Voltage Accuracy  
Power Good Output Voltage Monitor  
Phase-Lockable 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,andawide4.5Vto28V(30Vmaximum)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  
Small 28-Lead Narrow SSOP Package (0.150˝ Wide)  
Selectable Constant Frequency, Burst Mode® or  
PWM Operation  
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. The IC includes a power  
goodoutputpinthatindicateswhenbothoutputsarewithin  
7.5% of their designed set point.  
n
Notebook and Palmtop Computers, PDAs  
n
Telecom Systems  
n
Portable Instruments  
Battery-Operated Digital Devices  
n
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode  
and OPTI-LOOP are registered trademarks of Linear Technology Corporation. Protected by U.S.  
Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6304066, 6580258.  
n
DC Power Distribution Systems  
V
IN  
5.2V TO 28V  
C
22μF  
50V  
IN  
+
TYPICAL APPLICATION  
1μF  
4.7μF  
D3  
CERAMIC  
D4  
V
PGOOD INTV  
IN  
CC  
CERAMIC  
M1  
M3  
M4  
TG1  
TG2  
L1  
6.3μH  
L2  
6.3μH  
C
, 0.1μF  
B2  
BOOST1  
SW1  
BOOST2  
SW2  
LTC3707-SYNC  
C
, 0.1μF  
B1  
M2  
BG1  
BG2  
D1  
D2  
f
PLLIN  
SENSE1  
PGND  
IN  
+
–
+
SENSE2  
R
R
SENSE1  
SENSE2  
0.01Ω  
1000pF  
1000pF  
0.01Ω  
–
SENSE1  
V
SENSE2  
V
V
3.3V  
5A  
OUT1  
5V  
5A  
OUT2  
V
OSENSE1  
TH1  
OSENSE2  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH2  
C
C
C2  
C
C1  
220pF  
C
OUT1  
OUT  
RUN/SS1  
SGND  
RUN/SS2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
220pF  
R
C2  
47μF  
6V  
56mμF  
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  
3707sfa  
1
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