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LTC1709 PDF预览

LTC1709

更新时间： 2024-09-23 22:55:51
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 373K
描述
2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator

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LTC1709 数据手册

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LTC1709  
2-Phase, 5-Bit Adjustable,  
High Efficiency, Synchronous Step-Down  
Switching Regulator  
U
DESCRIPTIO  
FEATURES  
The LTC®1709 is a 2-phase, VID programmable, synchro-  
nous step-down switching regulator controller that drives  
all N-channel external power MOSFET stages in 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 effectively  
multiplies the fundamental frequency by two, improving  
transient response while operating each channel at a  
optimum frequency for efficiency. Thermal design is also  
simplified.  
■
Two Ouput Stages Operate Antiphase Reducing  
Input Capacitance and Power Supply Noise  
5-Bit VID Control (VRM 8.4 Compliant)  
VOUT: 1.3V to 3.5V in 50mV/100mV Steps  
Current Mode Control Ensures Current Sharing  
True Remote Sensing Differential Amplifier  
OPTI-LOOPTM Compensation Minimizes COUT  
Programmable Fixed Frequency: 150kHz to  
300kHz—Effective 300kHz to 600kHz Switching  
Frequency  
■
■
■
■
■
■
■
■
■
■
■
■
■
±1% Output Voltage Accuracy  
Wide VIN Range: 4V to 36V Operation  
Adjustable Soft-Start Current Ramping  
Internal Current Foldback  
An internal differential amplifier provides true remote  
sensing of the regulated supply’s positive and negative  
output terminals as required in high current applications.  
Short-Circuit Shutdown Timer with Defeat Option  
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  
dissipatonduringshort-circuitconditionswhenovercurrent  
latchoff is disabled. OPTI-LOOP compensation allows the  
transient response to be optimized for a wide range of  
output capacitors and ESR values.  
Small 36-Lead Narrow (0.209") SSOP Package  
U
APPLICATIO S  
■
Desktop Computers  
■
Internet/Network 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.  
■
Battery Chargers  
U
TYPICAL APPLICATIO  
V
IN  
5V TO 28V  
Efficiency Curve  
10µF ×4  
35V  
0.1µF  
100  
90  
Q1  
Q2  
V
TG1  
BOOST 1  
SW1  
V
= 5V  
OUT  
= 200kHz  
IN  
RUN/SS  
S
IN  
0.002Ω  
V
= 1.6V  
0.47µF  
f
S
1µH  
S
LTC1709  
1.2nF  
BG1  
15k  
I
PGND  
TH  
SGND  
80  
+
S
SENSE1  
SENSE1  
–
5 VID BITS VID0–VID4  
Q3  
Q4  
TG2  
BOOST2  
SW2  
70  
60  
50  
S
0.002Ω  
EAIN  
V
OUT  
0.47µF  
1.3V TO 3.5V  
40A  
1µH  
FBOUT  
SENSEIN  
S
S
S
BG2  
V
V
V
INTV  
DIFFOUT  
CC  
+
C
10µF  
OUT  
+
–
SENSE 2  
SENSE 2  
1000µF  
4V  
OS  
0
5
10 15 20 25 30 35 40 45  
LOAD CURRENTS (A)  
+
–
OS  
×2  
1709 TA01a  
Q1–Q4 2× FAIRCHILD FDS7760A OR SILICONIX Si4874  
1709 TA01  
Figure 1. High Current 2-Phase Step-Down Converter  
1
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