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LTC1709-85 PDF预览

LTC1709-85

更新时间： 2024-01-09 09:53:37
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 313K
描述
2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulator

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LTC1709-85 数据手册

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LTC1709-85  
2-Phase, 5-Bit VID,  
Current Mode, High Efficiency,  
Synchronous Step-Down Switching Regulator  
U
DESCRIPTIO  
FEATURES  
The LTC®1709-85 is a 2-phase, VID programmable, syn-  
chronous step-down switching regulator controller that  
drivestwoallN-channelexternalpowerMOSFETstagesin  
a fixed frequency architecture. The 2-phase 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 2-phase technique effec-  
tively multiplies the fundamental frequency by two, im-  
proving transient response while operating each channel  
at an optimum frequency for efficiency. Thermal design is  
also simplified.  
■
Output Stages Operate Antiphase Reducing Input  
Capacitance Requirements and Power Supply  
Induced Noise  
Dual Input Supply Capability for Load Sharing  
5-Bit VID Code (VRM 8.5): VOUT = 1.05V to 1.825V  
True Remote Sensing Differential Amplifier  
Power Good Output Indicator  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
±1% Output Voltage Accuracy  
Active Voltage Positioning Capable  
Current Mode Control Ensures Current Sharing  
OPTI-LOOP® Compensation Minimizes COUT  
Three Operational Modes: PWM, Burst and Cycle Skip  
Programmable Fixed Frequency: 150kHz to 300kHz  
Wide VIN Range: 4V to 36V Operation  
An operating mode select pin (FCB) can be used to select  
among three modes including Burst Mode® operation for  
highestefficiency.Aninternaldifferentialamplifierprovides  
true remote sensing of the regulated supply’s positive and  
negative output terminals as required in high current ap-  
plications.  
Adjustable Soft-Start Current Ramping  
Internal Current Foldback and Short-Circuit Shutdown  
Overvoltage Soft Latch Eliminates Nuisance Trips  
Available in 36-Lead Narrow SSOP Package  
The RUN/SS pin provides 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 for a wide  
range of output capacitors and ESR values.  
U
APPLICATIO S  
■
Server/Desktop Computers  
■
Internet Servers  
■
Large Memory Arrays  
DC Power Distribution Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
5V TO 28V  
+
10µF  
35V  
×4  
0.1µF  
V
IN  
FCB  
TG1  
S
0.002Ω  
0.002Ω  
RUN/SS  
BOOST1  
SW1  
0.47µF  
220pF  
3.3k  
1µH  
S
LTC1709-85  
I
TH  
BG1  
SGND  
PGND  
+
SENSE1  
SENSE1  
PGOOD  
–
5 VID BITS VID0–VID4  
TG2  
BOOST2  
SW2  
V
OUT  
EAIN  
0.47µF  
1.05V TO 1.825V  
40A  
1µH  
ATTENOUT  
ATTENIN  
BG2  
V
V
V
INTV  
DIFFOUT  
CC  
+
10µF  
C
OUT  
+
–
SENSE2  
SENSE2  
OS  
1000µF  
4V  
+
–
OS  
×2  
170985 F01  
Figure 1. High Current Dual Phase Step-Down Converter  
170985f  
1
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