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LT3431

更新时间: 2024-11-05 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

LT3431 数据手册

 浏览型号LT3431的Datasheet PDF文件第2页浏览型号LT3431的Datasheet PDF文件第3页浏览型号LT3431的Datasheet PDF文件第4页浏览型号LT3431的Datasheet PDF文件第5页浏览型号LT3431的Datasheet PDF文件第6页浏览型号LT3431的Datasheet PDF文件第7页 
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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