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LT3431

更新时间： 2024-11-23 11:46:03
品牌 Logo 应用领域
Linear Systems 开关控制器
页数 文件大小 规格书
34页 443K
描述
100V Synchronous Switching Regulator Controller

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LT3431 数据手册

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LTC3703  
100V Synchronous  
Switching Regulator  
Controller  
FeaTures  
DescripTion  
The LTC®3703 is a synchronous step-down switching  
regulator controller that can directly step down voltages  
from up to 100V, making it ideal for telecom and automo-  
tive applications. The LTC3703 drives external N-channel  
MOSFETs using a constant frequency (up to 600kHz),  
voltage mode architecture.  
n
High Voltage Operation: Up to 100V  
n
Large 1Ω Gate Drivers  
n
No Current Sense Resistor Required  
n
Step-Up or Step-Down DC/DC Converter  
n
Dual N-Channel MOSFET Synchronous Drive  
n
Excellent Line and Load Transient Response  
n
Programmable Constant Frequency: 100kHz to  
A precise internal reference provides 1% DC accuracy.  
A high bandwidth error amplifier and patented line feed-  
forward compensation provide very fast line and load  
transient response. Strong 1Ω gate drivers allow the  
LTC3703todrivemultipleMOSFETsforhighercurrentap-  
plications.Theoperatingfrequencyisuserprogrammable  
from 100kHz to 600kHz and can also be synchronized to  
an external clock for noise-sensitive applications. Cur-  
rent limit is programmable with an external resistor and  
utilizesthevoltagedropacrossthesynchronousMOSFET  
to eliminate the need for a current sense resistor. For ap-  
plications requiring up to 60V operation with logic-level  
MOSFETS, refer to the LTC3703-5 data sheet.  
600kHz  
n
1% Reference Accuracy  
n
Synchronizable up to 600kHz  
n
Selectable Pulse-Skip Mode Operation  
n
Low Shutdown Current: 50µA Typ  
n
Programmable Current Limit  
n
Undervoltage Lockout  
n
Programmable Soft-Start  
n
16-Pin Narrow SSOP and 28-Pin SSOP Packages  
applicaTions  
n
48V Telecom and Base Station Power Supplies  
n
Networking Equipment, Servers  
PARAMETER  
Maximum V  
LTC3703-5  
60V  
LTC3703  
100V  
n
Automotive and Industrial Control  
IN  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
ThinSOT and No R  
MOSFET Gate Drive  
4.5V to 15V  
3.7V  
9.3V to 15V  
8.7V  
are trademarks of Linear Technology Corporation. All other trademarks  
SENSE  
+
V
CC  
V
CC  
UV  
UV  
are the property of their respective owners. Protected by U.S. Patents, including 5408150,  
5055767, 6677210, 5847554, 5481178, 6304066, 6580258.  
–
3.1V  
6.2V  
Typical applicaTion  
V
CC  
9.3V TO 15V  
+
V
22µF  
25V  
IN  
Efficiency vs Load Current  
BAS19  
0.1µF  
15V TO 100V  
100  
95  
MODE/SYNC  
V
IN  
+
30k  
68µF  
V = 25V  
IN  
f
BOOST  
TG  
SET  
V
= 50V  
LTC3703  
Si7456DP  
IN  
10k  
COMP  
8µH  
1000pF  
470pF  
15k  
V
= 75V  
IN  
V
12V  
5A  
OUT  
FB  
SW  
90  
+
270µF  
16V  
I
V
CC  
MAX  
8.06k  
1%  
10Ω  
INV  
DRV  
CC  
85  
0.1µF  
Si7456DP  
MBR1100  
RUN/SS  
GND  
BG  
113k  
1%  
10µF  
100Ω  
2200pF  
80  
BGRTN  
0
1
2
3
4
5
1µF  
LOAD (A)  
3703 F01b  
3703 F01  
Figure 1. High Efficiency High Voltage Step-Down Converter  
3703fc  
1
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