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LTC1709-8_1

更新时间： 2024-02-28 19:11:48
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 261K
描述
2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulators

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LTC1709-8_1 数据手册

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LTC1709-8/LTC1709-9  
2-Phase, 5-Bit VID,  
Current Mode, High Efficiency,  
Synchronous Step-Down Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®1709-8/LTC1709-9 are 2-phase, VID program-  
mable, synchronous step-down switching regulator con-  
trollersthatdrivetwoallN-channelexternalpowerMOSFET  
stages in a fixed frequency architecture. The 2-phase  
controller drives its two output stages out of phase at  
■
Single Controller Operates Two Output Stages  
Antiphase Reducing Required Input Capacitance  
and Power Supply Induced Noise  
■
Two 5-Bit Desktop VID Codes:  
LTC1709-8 For VRM8.4 (VOUT from 1.3V to 3.5V)  
LTC1709-9 For VRM9.0 (VOUT from 1.1V to 1.85V) frequencies from 150kHz to 300kHz to minimize the RMS  
■
■
■
■
■
■
■
■
■
■
■
■
Current Mode Control Ensures Best Current Sharing  
True Remote Sensing Differential Amplifier  
Power Good Output Indicator  
ripple currents in both input and output capacitors. The 2-  
phase technique effectively multiplies the fundamental  
frequency by two, improving transient response while  
operating each channel at an optimum frequency for  
efficiency. Thermal design is also simplified.  
OPTI-LOOPTM Compensation Minimizes COUT  
Programmable Fixed Frequency: 150kHz to 300kHz  
±1% Output Voltage Accuracy  
An internal differential amplifier provides true remote  
sensing of the regulated supply’s positive and negative  
output terminals as required for high current applications.  
Wide VIN Range: 4V to 36V Operation  
Adjustable Soft-Start Current Ramping  
Internal Current Foldback and Short-Circuit Shutdown  
Overvoltage Soft Latch Eliminates Nuisance Trips  
Low Shutdown Current: 20µA  
The RUN/SS pin provides 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 for a  
wide range of output capacitors and ESR values. The  
LTC1709-8/LTC1709-9 implement two different VID  
tables compliant with VRM8.4 and VRM9.0 respectively.  
Available in 36-LUead Narrow SSOP Package  
APPLICATIO S  
■
Workstations  
Internet Servers  
Large Memory Arrays  
DC Power Distribution Systems  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
OPTI-LOOP is a trademark of Linear Technology Corporation.  
■
U
TYPICAL APPLICATION  
V
IN  
5V TO 28V  
+
10µF  
35V  
×4  
0.1µF  
V
IN  
TG1  
BOOST1  
SW1  
S
0.002Ω  
RUN/SS  
0.47µF  
220pF  
1µH  
3.3k  
S
LTC1709-8  
I
BG1  
TH  
SGND  
PGND  
+
SENSE1  
SENSE1  
PGOOD  
–
5 VID BITS VID0–VID4  
TG2  
BOOST2  
SW2  
0.002Ω  
V
OUT  
1.3V TO 3.5V  
40A  
EAIN  
0.47µF  
1µH  
ATTENOUT  
ATTENIN  
BG2  
V
V
V
INTV  
DIFFOUT  
CC  
+
10µF  
C
OUT  
+
–
SENSE2  
SENSE2  
OS  
1000µF  
4V  
+
–
OS  
×2  
17097 F01  
Figure 1. High Current 2-Phase Step-Down Converter  
1
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