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LT8705 数据表(PDF) 1 Page - Linear Technology

部件名 LT8705
功能描述  Wide Input Range Synchronous Regulator Controller with Accurate Current Limit
PDF  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT8705 数据表(HTML) 1 Page - Linear Technology

  LT8705 Datasheet HTML 1Page - Linear Technology LT8705 Datasheet HTML 2Page - Linear Technology LT8705 Datasheet HTML 3Page - Linear Technology LT8705 Datasheet HTML 4Page - Linear Technology LT8705 Datasheet HTML 5Page - Linear Technology LT8705 Datasheet HTML 6Page - Linear Technology LT8705 Datasheet HTML 7Page - Linear Technology LT8705 Datasheet HTML 8Page - Linear Technology LT8705 Datasheet HTML 9Page - Linear Technology Next Button
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background image
LT3840
1
3840fa
For more information www.linear.com/LT3840
Typical applicaTion
FeaTures
DescripTion
Wide Input Range
Synchronous Regulator Controller
with Accurate Current Limit
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 RDS(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
inputvoltagerangeandeliminatingtheneedforanexternal
bias voltage. An accurate current limit set point regulates
the maximum output current. A current monitor reports
the average output current.
High Efficiency Synchronous Step-Down Converter
12VIN to 3.3VOUT Efficiency
applicaTions
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
Wide Input Range: 2.5V to 60V
n
Integrated Buck-Boost Supply for 7.5V MOSFET
Gate Drive
n
Programmable Constant-Current Operation with
Current Monitor Output
n
Low IQ: 75µA, 12VIN to 3.3VOUT
n
Selectable Low Output Ripple Burst Mode®
Operation
n
VOUT Up to 60V
n
Adjustable and Synchronizable: 50kHz to 1MHz
n
Internal OVLO Protects for Input Transients Up to 80V
n
Accurate Input Overvoltage and Undervoltage Threshold
n
Programmable Soft-Start with Voltage Tracking
n
Power Good and Output OVP
n
28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages
n
Automotive Supplies
n
Industrial Systems
n
Distributed DC Power Systems
LOAD CURRENT (A)
0
100
95
80
75
90
85
70
50
65
60
55
10
5
15
3840 TA01b
20
ICOMP
ICTRL
IMON
AUXSW2
AUXSW1
AUXBST
LT3840
3840 TA01a
INTVCC
BOOST
TG
SW
BG
SENSE+
SENSE–
FB
GND
VIN
VIN
4V TO 60V
68µF
×2
330µF
×2
49.9k
20k
7.68k
10k
16.9k
1500pF
2200pF
470pF
100pF
1µF
1µF
1.5µH
2m
4.7µF
33µH
EN
TK/SS
AUXVIN
UVLO
OVLO
PG
SYNC
MODE
RT
VC
VOUT
3.3V
20A


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