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LTC3812IFE-5-TR

更新时间： 2024-11-29 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
32页 420K
描述
60V Current Mode Synchronous Switching Regulator Controller

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LTC3812IFE-5-TR 数据手册

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LTC3812-5  
60V Current Mode  
Synchronous Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
The LTC3812-5 is a synchronous step-down switching  
regulator controller that can directly step down voltages  
from up to 60V input, making it ideal for telecom and  
automotive applications. The LTC3812-5 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
High Voltage Operation: Up to 60V  
n
Large 1Ω Gate Drivers  
n
No Current Sense Resistor Required  
n
Dual N-Channel MOSFET Synchronous Drive  
n
Extremely Fast Transient Response  
n
0.5% 0.8V Voltage Reference  
n
Programmable Soft-Start  
n
Generates 5.5V Driver Supply  
A precise internal reference provides 0.5% DC accuracy.  
A high bandwidth (25MHz) error amplifier provides very  
fast line and load transient response. Large 1Ω gate driv-  
ers allow the LTC3812-5 to drive large power MOSFETs  
for higher current applications. The operating frequency  
is selected by an external resistor and is compensated for  
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  
Undervoltage Lockout On Driver Supply  
Output Overvoltage Protection  
variations in V . A shutdown pin allows the LTC3812-5 to  
IN  
Thermally Enhanced 16-Pin TSSOP Package  
be turned off reducing the supply current to <230μA.  
Integrated bias control generates gate drive power from  
theinputsupplyduringstart-upandwhenanoutputshort-  
circuit occurs, with the addition of a small external SOT23  
MOSFET. When in regulation, power is derived from the  
outputforhigherefficiency.  
APPLICATIONS  
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  
V
IN  
6V TO 60V  
R
ON  
+
Efficiency vs Load Current  
100k  
C
IN  
22μF  
110k  
100  
M3  
ZXMN-  
10A07F  
I
NDRV  
ON  
V
= 12V  
IN  
100k  
95  
90  
85  
BOOST  
PGOOD  
LTC3812-5  
PGOOD  
M1  
L1  
V
TG  
V
IN  
= 42V  
RNG  
Si7850DP  
4.7μH  
0.1μF  
V
5V  
5A  
OUT  
V
= 24V  
IN  
FCB  
SW  
EXTV  
INTV  
CC  
CC  
RUN/SS  
M2  
Si7850DP  
1000pF  
I
BG  
TH  
10k  
47pF  
+
D1  
MBR1100  
C
OUT  
270μF  
200k  
5pF  
1μF  
V
FB  
PGND  
SGND  
80  
0
1
2
3
4
5
6
LOAD CURRENT (A)  
1.89k  
38125 TA01b  
38125 TA01  
38125fb  
1
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