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LTC3716EG PDF预览

LTC3716EG

更新时间: 2024-11-10 22:55:55
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 440K
描述
2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

LTC3716EG 数据手册

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LTC3716  
2-Phase, 5-Bit VID,  
Current Mode, High Efficiency,  
Synchronous Step-Down  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®3716 is a 2-phase, VID programmable, synchro-  
nous step-down switching regulator controller that drives  
twoN-channelexternalpowerMOSFETstagesinafixedfre-  
quency 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.The2-phasetechniqueeffectivelymultipliesthe  
fundamental frequency by two, improving transient re-  
sponse while operating each channel at an optimum fre-  
quency for efficiency. Thermal design is also simplified.  
Output Stages Operate Antiphase Reducing Input  
and Output Capacitance Requirements and Power  
Supply Induced Noise  
Dual Input Supply Capability for Load Sharing  
5-Bit Mobile VID Code: VOUT = 0.6V to 1.75V  
±1% Output Voltage Accuracy  
True Remote Sensing Differential Amplifier  
Power Good Output Voltage Monitor  
Supports Active Voltage Positioning  
Current Mode Control Ensures Current Sharing  
OPTI-LOOPTM Compensation Minimizes COUT  
An operating mode select pin (FCB) can be used to regu-  
Three Operational Modes: PWM, Burst and Cycle Skip  
Programmable Fixed Frequency: 150kHz to 300kHz  
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  
late a secondary winding or select among three modes  
includingBurstModeTM operationforhighestefficiency.An  
internaldifferentialamplifierprovidestrueremotesensing  
of the regulated supply’s positive and negative output ter-  
minals as required in high current applications.  
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.  
Available in 36-LUead Narrow SSOP Package  
APPLICATIO S  
Mobile Computer CPU Supply  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
V
IN  
5V TO 28V  
10µF  
35V  
×4  
0.1µF  
V
IN  
FCB  
TG1  
BOOST1  
SW1  
S
0.002Ω  
2
RUN/SS  
1
0.47µF  
220pF  
1µH  
3.3k  
S
3
4
LTC3716  
D1  
I
TH  
BG1  
SGND  
PGND  
+
SENSE1  
SENSE1  
PGOOD  
5 VID BITS VID0–VID4  
TG2  
BOOST2  
SW2  
V
0.002Ω  
OUT  
1
2
EAIN  
0.47µF  
0.6V TO 1.75V  
40A  
1µH  
ATTENOUT  
ATTENIN  
3
4
D2  
BG2  
+
V
V
V
INTV  
DIFFOUT  
CC  
+
C
OUT  
+
SENSE2  
SENSE2  
OS  
1000µF  
4V  
10µF  
+
OS  
×2  
3716 F01  
Figure 1. High Current Dual Phase Step-Down Converter  
1

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