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LTC3786HMSE Datasheet

Synchronous Boost Controller

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FEATURES
n Synchronous Operation For Highest Efficiency and
Reduced Heat Dissipation
n Wide VIN Range: 4.5V to 38V (40V Abs Max) and
Operates Down to 2.5V After Start-Up
n Output Voltages Up to 60V
n ±1% 1.2V Reference Voltage
n RSENSE or Inductor DCR Current Sensing
n 100% Duty Cycle Capability for Synchronous MOSFET
n Low Quiescent Current: 55µA
n Phase-Lockable Frequency (75kHz to 850kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Adjustable Output Voltage Soft-Start
n Power Good Output Voltage Monitor
n Low Shutdown Current IQ: <8µA
n Internal 5.4V LDO for Gate Drive Supply
n Thermally Enhanced 16-Pin 3mm × 3mm QFN and
MSOP Packages
APPLICATIONS
n Industrial and Automotive Power Supplies
n Automotive Start-Stop Systems
n Medical Devices
n High Voltage Battery-Powered Systems
LTC3786
Low IQ Synchronous
Boost Controller
DESCRIPTION
The LTC®3786 is a high performance synchronous boost
converter controller that drives all N-channel power
MOSFETs. Synchronous rectification increases efficiency,
reduces power losses and eases thermal requirements,
allowing the LTC3786 to be used in high power boost
applications.
A 4.5V to 38V input supply range encompasses a wide
range of system architectures and battery chemistries.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3786 can operate from
an input supply as low as 2.5V after start-up. The 55µA
no-load quiescent current extends operating run time in
battery-powered systems.
The operating frequency can be set for a 50kHz to 900kHz
range or synchronized to an external clock using the
internal PLL. The LTC3786 also features a precision 1.2V
reference and a power good output indicator. The SS pin
ramps the output voltage during start-up. The PLLIN/MODE
pin selects among Burst Mode® operation, pulse-skipping
mode or continuous inductor current mode at light loads.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V to 24V/5A Synchronous Boost Converter
VBIAS
SENSE+
0.1µF
LTC3786
PGOOD
SENSE
PLLIN/MODE
RUN
FREQ
TG
SS
15nF
8.66k
ITH
220pF
SW
BOOST
BG
12.1k
VFB
INTVCC
232k
GND
VIN 4.5V TO 24V
0.1µF
4mΩ
220µF
3.3µH
220µF
VOUT
24V
5A
4.7µF
3786 TA01a
Efficiency and Power Loss
vs Load Current
100
10000
90
80
BURST
EFFICIENCY
70
60
BURST
LOSS
1000
100
50
40
10
30
20
10
0
0.00001 0.0001 0.001
VIN = 12V
VOUT = 24V
1
Burst Mode OPERATION
FIGURE 8 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
3786 TA01b
For more information www.linear.com/LTC3786
3786fc
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Analog Devices Semiconductor Electronic Components Datasheet

LTC3786HMSE Datasheet

Synchronous Boost Controller

No Preview Available !

LTC3786
ABSOLUTE MAXIMUM RATINGS (Notes 1, 3)
VBIAS ........................................................ –0.3V to 40V
BOOST ........................................................–0.3V to 71V
SW ............................................................. –0.3V to 65V
RUN ............................................................. –0.3V to 8V
Maximum Current Sourced into Pin
from Source >8V ..............................................100µA
PGOOD, PLLIN/MODE.................................. –0.3V to 6V
INTVCC, (BOOST – SW) ............................... –0.3V to 6V
SENSE+, SENSE........................................ –0.3V to 40V
SENSE+ – SENSE..................................... –0.3V to 0.3V
SS, ITH, FREQ, VFB............................... –0.3V to INTVCC
Operating Junction Temperature Range (Notes 2, 3)
LTC3786E, LTC3786I ..........................–40°C to 125°C
LTC3786H...........................................–40°C to 150°C
Storage Temperature Range ....................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSE Package Only............................................ 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
VFB 1
SENSE+ 2
SENSE3
16 PGOOD
15 SW
14 TG
ITH 4
17
13 BOOST
SS 5
GND
12 VBIAS
PLLIN/MODE 6
FREQ 7
11 INTVCC
10 BG
RUN 8
9 GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
16 15 14 13
SW 1
12 BG
PGOOD 2
17
11 GND
VFB 3
GND
10 RUN
SENSE+ 4
9 FREQ
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 150°C, θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC3786#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3786EMSE#PBF
LTC3786EMSE#TRPBF 3786
16-Lead Plastic MSOP
–40°C to 125°C
LTC3786IMSE#PBF
LTC3786IMSE#TRPBF 3786
16-Lead Plastic MSOP
–40°C to 125°C
LTC3786HMSE#PBF
LTC3786HMSE#TRPBF 3786
16-Lead Plastic MSOP
–40°C to 150°C
LTC3786EUD#PBF
LTC3786EUD#TRPBF
LFXW
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3786IUD#PBF
LTC3786IUD#TRPBF
LFXW
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3786HUD#PBF
LTC3786HUD#TRPBF LFXW
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3786fc
2
For more information www.linear.com/LTC3786


Part Number LTC3786HMSE
Description Synchronous Boost Controller
Maker Analog Devices
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