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LT3840

更新时间： 2024-09-23 12:57:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 285K
描述
60V DC-DC

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中文翻译

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LT3840 数据手册

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LT3840  
Wide Input Range  
Synchronous Regulator Controller  
with Accurate Current Limit  
DescripTion  
FeaTures  
The LT®3840 is a high voltage synchronous step-down  
n
Wide Input Range: 2.5V to 60V  
n
switching regulator controller capable of operating from  
a 2.5V to 60V supply.  
Integrated Buck-Boost Supply for 7.5V MOSFET  
Gate Drive  
n
Programmable Constant-Current Operation with  
The LT3840’s low quiescent current, when configured for  
user selectable Burst Mode operation, helps extend run  
time in battery-powered systems by increasing efficiency  
at light loads. The LT3840 uses a constant frequency,  
current mode architecture. High current applications are  
possible with large N-channel gate drivers capable of  
Current Monitor Output  
n
Low I : 75µA, 12V to 3.3V  
Q
IN  
OUT  
Selectable Low Output Ripple Burst Mode®  
Operation  
n
n
n
n
n
n
n
n
V
Up to 60V  
OUT  
Adjustable and Synchronizable: 50kHz to 1MHz  
Internal OVLO Protects for Input Transients Up to 80V  
Accurate Input Overvoltage and Undervoltage Threshold  
Programmable Soft-Start with Voltage Tracking  
Power Good and Output OVP  
driving multiple low R  
MOSFETs.  
DS(ON)  
An integrated buck-boost switching regulator generates  
a 7.5V bias supply voltage for MOSFET gate drive and IC  
power allowing higher efficiency operation over the entire  
inputvoltagerangeandeliminatingtheneedforanexternal  
bias voltage. An accurate current limit set point regulates  
the maximum output current. A current monitor reports  
the average output current.  
28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages  
applicaTions  
n
Automotive Supplies  
L, LT, LTC, LTM, Linear Technology, Burst Mode, and the Linear logo are registered  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners.  
n
Industrial Systems  
n
Distributed DC Power Systems  
Typical applicaTion  
High Efficiency Synchronous Step-Down Converter  
12VIN to 3.3VOUT Efficiency  
V
IN  
4V TO 60V  
1µF  
68µF  
×2  
33µH  
100  
95  
90  
85  
80  
75  
70  
65  
AUXBST AUXSW1 AUXSW2  
EN  
INTV  
CC  
4.7µF  
1µF  
V
IN  
AUXVIN  
UVLO  
OVLO  
PG  
BOOST  
LT3840  
TG  
SW  
BG  
1.5µH  
2m  
V
3.3V  
20A  
60  
55  
50  
OUT  
SYNC  
MODE  
RT  
330µF  
×2  
0
5
10  
15  
20  
LOAD CURRENT (A)  
3840 TA01b  
+
SENSE  
–
V
SENSE  
C
16.9k  
10k  
49.9k  
20k  
TK/SS  
FB  
1500pF  
100pF  
GND  
IMON  
2200pF  
ICOMP  
ICTRL  
7.68k  
470pF  
3840 TA01a  
3840fa  
For more information www.linear.com/LT3840  
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