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LT3840 PDF Datasheet浏览和下载

型号：
LT3840
PDF下载：
下载PDF文件 在线浏览文档
内容描述：
[60V DC-DC]
文件大小：
285 K
文件页数：
24 Pages
品牌Logo:
品牌名称：
LINER [ LINEAR TECHNOLOGY ]



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FeaTures
n
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LT3840
Wide Input Range
Synchronous Regulator Controller
with Accurate Current Limit
DescripTion
The
LT
®
3840
is a high voltage synchronous step-down
switching regulator controller capable of operating from
a 2.5V to 60V supply.
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
driving multiple low R
DS(ON)
MOSFETs.
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
input voltage range and eliminating the need for an external
bias voltage. An accurate current limit set point regulates
the maximum output current. A current monitor reports
the average output current.
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
n
n
n
n
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n
n
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Wide Input Range: 2.5V to 60V
Integrated Buck-Boost Supply for 7.5V MOSFET
Gate Drive
Programmable Constant-Current Operation with
Current Monitor Output
Low I
Q
: 75µA, 12V
IN
to 3.3V
OUT
Selectable Low Output Ripple Burst Mode
®
Operation
V
OUT
Up to 60V
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
28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages
applicaTions
n
n
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Automotive Supplies
Industrial Systems
Distributed DC Power Systems
Typical applicaTion
High Efficiency Synchronous Step-Down Converter
V
IN
4V TO 60V
68µF
×2
1µF
33µH
100
95
AUXBST AUXSW1
EN
V
IN
AUXVIN
UVLO
OVLO
PG
SYNC
MODE
RT
V
C
49.9k
20k
1500pF
100pF
IMON
ICOMP
7.68k
470pF
3840 TA01a
12V
IN
to 3.3V
OUT
Efficiency
AUXSW2
INTV
CC
90
EFFICIENCY (%)
1.5µH
2m
V
OUT
3.3V
20A
330µF
×2
4.7µF
85
80
75
70
65
60
55
50
0
5
10
15
LOAD CURRENT (A)
20
3840 TA01b
LT3840
BOOST
1µF
TG
SW
BG
SENSE
+
SENSE
–
FB
GND
ICTRL
16.9k
10k
TK/SS
2200pF
3840fa
For more information
www.linear.com/LT3840
1

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