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LTC3728LCGNPBF

更新时间： 2024-09-25 12:09:59
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
38页 460K
描述
Dual, 550kHz, 2-Phase Synchronous Regulators

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LTC3728LCGNPBF 数据手册

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LTC3728L/LTC3728LX  
Dual, 550kHz, 2-Phase  
Synchronous Regulators  
FeaTures  
DescripTion  
Dual, 180° Phased Controllers Reduce Required  
The LTC®3728L/LTC3728LX are dual high performance  
step-down switching regulator controllers that drive all  
N-channelsynchronouspowerMOSFETstages.Aconstant-  
frequency,currentmodearchitectureallowsphase-lockable  
frequency of up to 550kHz. Power loss and noise due to  
theESRoftheinputcapacitorsareminimizedbyoperating  
the two controller output stages out of phase.  
n
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
OUT  
n
1ꢀ Output Voltage Accuracy (LTC3728LC)  
n
Power Good Output Voltage Indicator  
n
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
n
Dual N-Channel MOSFET Synchronous Drive  
n
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  
output indicator are compatible with future microproces-  
sor generations, and a wide 4.5V to 28V (30V maximum)  
input supply range encompasses all battery chemistries.  
n
n
n
n
n
n
n
n
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  
Low Shutdown I : 20µA  
5V and 3.3V Standby Regulators  
3 Selectable Operating Modes: Constant-Frequency,  
Burst Mode® Operation and PWM  
5mm × 5mm QFN and 28-Lead Narrow SSOP  
Packages  
Q
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  
n
MOSFET until V  
returns to normal. The FCB mode  
OUT  
pin can select among Burst Mode, constant-frequency  
mode and continuous inductor current mode or regulate  
a secondary winding. The LTC3728L/LTC3728LX include  
a power good output pin that indicates when both outputs  
are within 7.5% of their designed set point.  
applicaTions  
n
Notebook and Palmtop Computers  
n
Telecom Systems  
n
Portable Instruments  
n
Battery-Operated Digital Devices  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase  
are registered trademarks of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
n
DC Power Distribution Systems  
Typical applicaTion  
V
IN  
5.2V TO 28V  
C
22µF  
50V  
IN  
1µF  
CERAMIC  
+
4.7µF  
D3  
D4  
V
PGOOD INTV  
IN  
CC  
CERAMIC  
M1  
M2  
TG1  
TG2  
L1  
3.2µH  
L2  
3.2µH  
BOOST1  
SW1  
BOOST2  
SW2  
C
, 0.1µF  
C
B2  
, 0.1µF  
B1  
LTC3728L/  
LTC3728LX  
BG1  
BG2  
D1  
D2  
f
IN  
500kHz  
PLLIN  
PGND  
+
+
SENSE1  
SENSE2  
R
R
SENSE2  
0.01Ω  
SENSE1  
1000pF  
1000pF  
0.01Ω  
–
–
SENSE1  
V
SENSE2  
V
V
3.3V  
5A  
OSENSE1  
TH1  
OSENSE2  
V
OUT2  
OUT1  
5V  
5A  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH2  
C
C
C2  
C1  
220pF  
C
47µF  
6V  
C
56µF  
6V  
RUN/SS1 SGND RUN/SS2  
OUT1  
OUT  
220pF  
R
C2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
R
C1  
C
C
SS2  
0.1µF  
SS1  
0.1µF  
15k  
15k  
SP  
SP  
M1, M2: FDS6982S  
3728 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
3728lxff  
1
1234567...38

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