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LTC1629C

更新时间： 2024-09-12 22:57:35
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
28页 332K
描述
PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulators

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LTC1629C 数据手册

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LTC1629/LTC1629-PG  
PolyPhase, High Efficiency,  
Synchronous Step-Down Switching Regulators  
U
DESCRIPTIO  
FEATURES  
The LTC®1629/LTC1629-PG are multiple phase, dual,  
synchronous step-down current mode switching regula-  
torcontrollersthatdriveN-channelexternalpowerMOSFET  
stages in a phase-lockable fixed frequency architecture.  
The PolyPhaseTM controller drives its two output stages  
out of phase at frequencies up to 300kHz 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. The multiple phase technique  
effectively multiplies 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.  
■
Dual Controller Operates from One to Twelve Phases  
Reduces Required Input Capacitance and Power  
Supply Induced Noise  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Current Mode Control Ensures Current Sharing  
Phase-Lockable Fixed Frequency: 150kHz to 300kHz  
1.8MHz Effective Switching Frequency  
True Remote Sensing Differential Amplifier  
OPTI-LOOPTM Compensation Reduces COUT  
±
1% Output Voltage Accuracy  
Power Good Output Voltage Monitor (LTC1629-PG)  
Wide VIN Range: 4V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Internal Current Foldback Plus Shutdown Timer  
Overvoltage Soft-Latch Eliminates Nuisance Trips  
Micropower Shutdown  
An internal differential amplifier provides true remote  
sensing of the regulated supply’s positive and negative  
output terminals as required for high current applications.  
Available in 28-Lead SSOP Package  
U
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  
overcurrent latchoff is disabled. OPTI-LOOP compensa-  
tion allows the transient response to be optimized over a  
wide range of output capacitance and ESR values. The  
LTC1629-PG includes a power good output pin that re-  
places the AMPMD control pin of the LTC1629.  
APPLICATIO S  
■
Desktop Computers  
■
Internet Servers  
■
Large Memory Arrays  
■
DC Power Distribution Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
OPTI-LOOP and PolyPhase are trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
10Ω  
V
IN  
5V TO 28V  
10µF ×4  
35V  
0.1µF  
M1  
S
LTC1629-PG  
TG1  
V
IN  
CERAMIC  
S
0.003Ω  
BOOST1  
SW1  
0.47µF  
0.1µF  
L1  
1µH  
S
M2  
×2  
RUN/SS  
PGOOD  
BG1  
D1  
PGND  
1000pF  
+
SENSE1  
I
TH  
–
SENSE1  
3.3k  
M3  
TG2  
BOOST2  
SW2  
S
0.003Ω  
S
SGND  
V
OUT  
0.47µF  
1.6V/40A  
L2  
S
S
16k  
S
M4  
×2  
1µH  
V
BG2  
DIFFOUT  
D2  
S
EAIN  
–
INTV  
CC  
+
10µF  
+
C
OUT  
V
OS  
V
OS  
SENSE2  
SENSE2  
16k  
1000µF ×2  
+
–
4V  
C
: T510E108K004AS  
L1, L2: CEPH149-IROMC  
M1, M3: IRF7811  
M2, M4: IRF7809  
OUT  
1629 TA01  
D1, D2: UP5840  
Figure 1. High Current Dual Phase Step-Down Converter  
1
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