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LTC3810EUH-5-TR

更新时间： 2024-09-24 05:43:55
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
36页 1400K
描述
60V Current Mode Synchronous Switching Regulator Controller

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LTC3810EUH-5-TR 数据手册

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LTC3810-5  
60V Current Mode  
Synchronous Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
n
High Voltage Operation: Up to 60V  
The LTC®3810-5 is a synchronous step-down switching  
regulator controller that can directly step-down voltages  
from up to 60V, making it ideal for telecom and automo-  
tive applications. The LTC3810-5 uses a constant on-time  
valley current control architecture to deliver very low duty  
cycles with accurate cycle-by-cycle current limit, without  
requiring a sense resistor.  
n
Large 1Ω Gate Drivers  
n
No Current Sense Resistor Required  
n
Dual N-Channel MOSFET Synchronous Drive  
n
Extremely Fast Transient Response  
0.5% 0.8V Voltage Reference  
n
n
Programmable Output Voltage Tracking/Soft-Start  
n
Generates 5.5V Driver Supply from Input Supply  
A precise internal reference provides 0.5% DC accuracy. A  
highbandwidth(25MHz)erroramplifierprovidesveryfast  
line and load transient response. Large 1Ω gate drivers  
allow the LTC3810-5 to drive multiple MOSFETs for higher  
current applications. The operating frequency is selected  
by an external resistor and is compensated for variations  
n
Synchronizable to External Clock  
n
Selectable Pulse Skip Mode Operation  
n
Power Good Output Voltage Monitor  
n
Adjustable On-Time/Frequency: t  
< 100ns  
ON(MIN)  
n
n
n
n
Adjustable Cycle-by-Cycle Current Limit  
Programmable Undervoltage Lockout  
Output Overvoltage Protection  
in V and can also be synchronized to an external clock  
IN  
for switching-noise sensitive applications. A shutdown  
pin allows the LTC3810-5 to be turned off, reducing the  
supply current to 240μA.  
Thermally Enhanced 32-Pin QFN Package  
APPLICATIONS  
Integrated bias control generates gate drive power from  
the input supply during start-up or when an output short-  
circuit occurs, with the addition of a small external SOT23  
MOSFET. When in regulation, power is derived from the  
output for higher efficiency.  
n
48V Telecom and Base Station Power Supplies  
n
Networking Equipment, Servers  
n
Automotive and Industrial Control Systems  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611.  
TYPICAL APPLICATION  
High Efficiency High Voltage Step-Down Converter  
Efficiency vs Load Current  
V
100  
IN  
13V TO 60V  
+
274k  
100k  
22μF  
V
V
= 24V  
= 42V  
IN  
IN  
I
ON  
NDRV  
ZXMN10A07F  
95  
90  
85  
PGOOD  
BOOST  
LTC3810-5  
V
RNG  
Si7450DP  
TG  
10μH  
0.1μF  
V
MODE/SYNC  
SS/TRACK  
SHDN  
OUT  
SW  
1000pF  
12V/6A  
EXTV  
DRV  
INTV  
CC  
CC  
14k  
CC  
+
+
MBR1100  
270μF  
0
2
3
4
5
6
1
SENSE  
I
TH  
5pF  
LOAD CURRENT (A)  
200k  
Si7450DP  
BG  
38105 TA01b  
V
FB  
–
SENSE  
BGRTN  
47pF  
SGND  
1μF  
1k  
38105 TA01  
38105fc  
1
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