Regulator Controller. LT3840 Datasheet

LT3840 Controller. Datasheet pdf. Equivalent

Part LT3840
Description Wide Input Range Synchronous Regulator Controller
Feature Features LT3840 Wide Input Range Synchronous Regulator Controller with Accurate Current Limit Descr.
Manufacture Linear Technology
Datasheet
Download LT3840 Datasheet

Features LT3840 Wide Input Range Synchronous Regulator Cont LT3840 Datasheet
Recommendation Recommendation Datasheet LT3840 Datasheet





LT3840
Features
LT3840
Wide Input Range
Synchronous Regulator Controller
with Accurate Current Limit
Description
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
Applications
n Automotive Supplies
n Industrial Systems
n Distributed DC Power Systems
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
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.
Typical Application
VIN
4V TO 60V
High Efficiency Synchronous Step-Down Converter
68µF 1µF 33µH
×2
49.9k
AUXBST AUXSW1
EN
VIN
AUXVIN
UVLO
LT3840
AUXSW2
INTVCC
BOOST
OVLO
TG
PG SW
SYNC
BG
20k
1500pF
MODE
RT SENSE+
VC SENSE
TK/SS
FB
100pF
IMON
ICOMP
GND
ICTRL
2200pF
7.68k
470pF
4.7µF
1µF
1.5µH
16.9k
10k
2m
VOUT
3.3V
20A
330µF
×2
3840 TA01a
12VIN to 3.3VOUT Efficiency
100
95
90
85
80
75
70
65
60
55
50
0
5 10 15
LOAD CURRENT (A)
20
3840 TA01b
For more information www.linear.com/LT3840
3840fa
1



LT3840
LT3840
Absolute Maximum Ratings
(Note 1)
AUXVIN, VIN, EN and UVLO........................ –0.3V to 80V
PG............................................................... –0.3V to 25V
MODE............................................................ –0.3V to 9V
SENSE+ and SENSE................................... –0.3V to 60V
SENSE+ to SENSE............................................–1V to 1V
OVLO, VC, FB, SYNC, TK/SS and ICTRL........ –0.3V to 6V
Junction Temperature Range
LT3840E (Note 2)............................... –40°C to 125°C
LT3840I.............................................. –40°C to 125°C
LT3840H............................................. –40°C to 150°C
LT3840MP.......................................... –55°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP Only........................................................... 300°C
Storage Temperature............................. –65°C to 150°C
Pin Configuration
TOP VIEW
AUXSW1 1
28 AUXBST
PGND 2
27 AUXSW2
AUXVIN 3
26 INTVCC
SYNC 4
25 BG
RT 5
24 BGRTN
TK/SS 6
23 BOOST
FB 7
VC 8
PG 9
29 22 TG
GND 21 SW
20 SENSE
MODE 10
19 SENSE+
OVLO 11
18 ICOMP
UVLO 12
17 ICTRL
EN 13
16 IMON
VIN 14
15 GND
FE PACKAGE
28-LEAD PLASTIC TSSOP
θJA = 30°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
AUXVIN 1
NC 2
SYNC 3
RT 4
NC 5
TK/SS 6
FB 7
VC 8
PG 9
NC 10
MODE 11
OVLO 12
38 37 36 35 34 33 32
39
GND
13 14 15 16 17 18 19
31 NC
30 INTVCC
29 BG
28 BGRTN
27 NC
26 BOOST
25 TG
24 SW
23 NC
22 SENSE
21 SENSE+
20 ICOMP
UFE PACKAGE
38-LEAD (4mm × 6mm) PLASTIC QFN
θJA = 38°C/W, θJC = 4°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3840EFE#PBF
LT3840EFE#TRPBF
LT3840FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3840IFE#PBF
LT3840IFE#TRPBF
LT3840FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3840HFE#PBF
LT3840HFE#TRPBF
LT3840FE
28-Lead Plastic TSSOP
–40°C to 150°C
LT3840MPFE#PBF
LT3840MPFE#TRPBF
LT3840FE
28-Lead Plastic TSSOP
–55°C to 150°C
LT3840EUFE#PBF
LT3840EUFE#TRPBF
3840
38-Lead (4mm × 6mm) Plastic QFN
–40°C to 125°C
LT3840IUFE#PBF
LT3840IUFE#TRPBF
3840
38-Lead (4mm × 6mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3840fa
2 For more information www.linear.com/LT3840





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