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LTC1628-SYNC

更新时间： 2024-10-31 22:09:19
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
32页 375K
描述
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

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中文翻译

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LTC1628-SYNC 数据手册

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LTC1628-SYNC  
High Efficiency, 2-Phase  
Synchronous Step-Down Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®1628-SYNC is a high performance dual step-  
down switching regulator controller that drives all  
N-channel synchronous power MOSFET stages. A con-  
stant frequency current mode architecture allows phase-  
lockable frequency of up to 300kHz. Power loss and noise  
due to the ESR of the input capacitors are minimized by  
operating the two controller output stages out of phase.  
■
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOPTM Compensation Minimizes COUT  
Dual N-Channel MOSFET Synchronous Drive  
±1% Output Voltage Accuracy  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Power Good Output Voltage Monitor  
Phase-Lockable Fixed Frequency 150kHz to 300kHz  
Wide VIN Range: 3.5V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues. Theprecision0.8Vreferenceandpowergood  
output indicator are compatible with future microproces-  
sor generations, and a wide 3.5V to 30V (36V maximum)  
input supply range encompasses all battery chemistries.  
Remote Output Voltage Sense  
A RUN/SS pin for each controller provides both soft-start  
and optional timed, short-circuit shutdown. Current  
foldback limits MOSFET dissipation during short-circuit  
conditions when overcurrent latchoff is disabled. Output  
overvoltage protection circuitry latches on the bottom  
MOSFET until VOUT returns to normal. The FCB mode pin  
can select among Burst Mode, constant frequency mode  
and continuous inductor current mode or regulate a  
secondarywinding. TheLTC1628-SYNCincludesapower  
good output pin that indicates when both outputs are  
within 7.5% of their designed set point.  
Low Shutdown IQ: 20µA  
5V and 3.3V Standby Regulators  
Small 28-Lead SSOP Package  
Selectable Constant Frequency or Burst ModeTM  
Operation  
U
APPLICATIO S  
■
Notebook and Palmtop Computers, PDAs  
■
Telecom Systems  
■
Portable Instruments  
■
Battery-Operated Digital Devices  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.  
■
DC Power Distribution Systems  
U
V
IN  
5.2V TO 28V  
TYPICAL APPLICATIO  
C
IN  
+
1µF  
22µF  
4.7µF  
D3  
CERAMIC  
50V  
D4  
V
PGOOD INTV  
IN  
CC  
CERAMIC  
M1  
M3  
M4  
TG1  
TG2  
L1  
6.3µH  
L2  
6.3µH  
C
, 0.1µF  
B2  
BOOST1  
SW1  
BOOST2  
SW2  
LTC1628-SYNC  
C
, 0.1µF  
B1  
M2  
BG1  
BG2  
D1  
D2  
f
PLLIN  
SENSE1  
PGND  
IN  
+
+
SENSE2  
R
R
SENSE2  
0.01Ω  
SENSE1  
1000pF  
1000pF  
0.01Ω  
–
–
SENSE1  
SENSE2  
V
V
3.3V  
5A  
OUT1  
5V  
5A  
OUT2  
V
V
OSENSE2  
OSENSE1  
R2  
105k  
1%  
R4  
63.4k  
1%  
I
I
TH1  
TH2  
C
C
C2  
C
C1  
220pF  
C
56µF  
6V  
OUT1  
OUT  
RUN/SS1  
SGND  
RUN/SS2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
220pF  
R
C2  
47µF  
6V  
R
C1  
C
C
SS1  
0.1µF  
SS2  
0.1µF  
15k  
15k  
SP  
SP  
M1, M2, M3, M4: FDS6680A  
1628 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
1
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