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LTC3880

更新时间： 2024-09-17 11:41:39
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
30页 343K
描述
550kHz, PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator

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LTC3729  
550kHz, PolyPhase,  
High Efficiency, Synchronous  
Step-Down Switching Regulator  
DESCRIPTION  
FEATURES  
The LTC®3729 is a multiple phase, synchronous  
n
Wide V Range: 4V to 36V Operation  
IN  
n
Reduces Required Input Capacitance and Power  
step‑down current mode switching regulator controller  
that drives N‑channel external power MOSFET stages in a  
phase‑lockablefixedfrequencyarchitecture.ThePolyPhase  
controller drives its two output stages out of phase at  
frequencies up to 550kHz to minimize the RMS ripple  
currents in both input and output capacitors. The output  
clock signal allows expansion for up to 12 evenly phased  
controllers for systems requiring 15A to 200A of output  
current.Themultiplephasetechniqueeffectivelymultiplies  
the fundamental frequency by the number of channels  
used, improving transient response while operating each  
channel at an optimum frequency for efficiency. Thermal  
design is also simplified.  
Supply Induced Noise  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
±1% Output Voltage Accuracy  
Phase-Lockable Fixed Frequency: 250kHz to 550kHz  
True Remote Sensing Differential Amplifier  
PolyPhase® Extends from Two to Twelve Phases  
Reduces the Size and Value of Inductors  
Current Mode Control Ensures Current Sharing  
1.1MHz Effective Switching Frequency (2‑Phase)  
OPTI‑LOOP® Compensation Reduces C  
OUT  
Power Good Output Voltage Indicator  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft‑Start Current Ramping  
Internal Current Foldback Plus Shutdown Timer  
Overvoltage Soft‑Latch Eliminates Nuisance Trips  
Available in 5mm × 5mm QFN  
Aninternaldifferentialamplifierprovidestrueremotesens‑  
ing of the regulated supply’s positive and negative output  
terminals as required for high current applications.  
and 28‑Lead SSOP Packages  
A RUN/SS pin provides both soft‑start and optional timed,  
short‑circuit shutdown. Current foldback limits MOSFET  
dissipation during short‑circuit conditions when the  
overcurrentlatchoffisdisabled.OPTI‑LOOPcompensation  
allows the transient response to be optimized over a wide  
range of output capacitance and ESR values. The LTC3729  
includes a power good output pin that indicates when the  
output is within ±7.5% of the designed set point.  
APPLICATIONS  
n
Desktop Computers/Servers  
n
Large Memory Arrays  
n
DC Power Distribution Systems  
L, LT, LTC, LTM, PolyPhase, OPTI‑LOOP, Linear Technology and the Linear logo are registered  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners.  
TYPICAL APPLICATION  
V
IN  
5V TO 28V  
0.1µF  
10Ω  
S
10µF  
35V  
CERAMIC  
×4  
M1  
S
LTC3729  
V
TG1  
BOOST1  
SW1  
IN  
0.002Ω  
0.47µF  
0.1µF  
L1  
0.8µH  
S
M2  
×2  
D1  
RUN/SS  
PGOOD  
BG1  
PGND  
+
SENSE1  
SENSE1  
I
TH  
–
3.3k  
16k  
1000pF  
16k  
M3  
TG2  
BOOST2  
SW2  
S
S
S
0.002Ω  
SGND  
V
OUT  
1.6V/40A  
0.47µF  
L2  
0.8µH  
S
S
S
M4  
×2  
V
BG2  
DIFFOUT  
D2  
EAIN  
–
INTV  
CC  
+
10µF  
+
C
OUT  
V
V
SENSE2  
SENSE2  
OS  
OS  
1000µF ×2  
+
–
4V  
C
: T510E108K004AS  
L1, L2: CEPH149-IROMC  
M1, M3: IRF7811W  
M2, M4: IRF7822  
OUT  
3729 TA01  
D1, D2: UP5840  
Figure 1. High Current Dual Phase Step-Down Converter  
3729fb  
1
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