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LTC3779HFE Datasheet

4-Switch Buck-Boost Controller

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LTC3779
150V VIN and VOUT Synchronous
4-Switch Buck-Boost Controller
FEATURES
DESCRIPTION
nn 4-Switch Current Mode Single Inductor Architecture
Allows VIN Above, Below or Equal to VOUT
nn Wide VIN Range: 4.5V to 150V
nn Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 150V
nn Synchronous Rectification: Up to 99% Efficiency
nn ±1% 1.2V Voltage Reference
nn Input or Output Average Current Limit
nn Onboard LDO or External NMOS LDO for DRVCC
nn 36V EXTVCC LDO Powers Drivers
nn Programmable 6V to 10V DRVCC Optimizes Efficiency
nn No Top FET Refresh Noise in Boost or Buck Mode
nn VOUT Disconnected from VIN During Shutdown
nn Phase-Lockable Fixed Frequency (50kHz to 600kHz)
nn No Reverse Current During Start-Up
nn Power Good Output Voltage Monitor
nn 150V Rated RUN Pin with Accurate Turn-On Threshold
nn Programmable Input Overvoltage Lockout
nn Thermally Enhanced FE38 TSSOP Package Modified
for High Voltage Operation
APPLICATIONS
The LTC®3779 is a high performance buck-boost switching
regulator controller that operates from input voltages
above, below or equal to the output voltage. The constant
frequency current mode architecture allows a phase-
lockable frequency of up to 600kHz, while an input/
output constant-current loop provides support for battery
charging.
With a wide 4.5V to 150V input and output range and
seamless transfers between operating regions, the
LTC3779 is ideal for automotive, telecom and battery-
powered systems.
The LTC3779 features a precision 1.2V reference and
power good output indicator. The MODE pin can select
between pulse-skipping mode or forced continuous mode
of operation. Pulse-skipping mode offers high efficiency
at light load while forced continuous mode operates at
a constant frequency for noise sensitive applications.
The PLLIN pin allows the IC to be synchronized to an
external clock. The SS pin ramps the output voltage
during start-up. Current foldback limits MOSFET heat
dissipation during short-circuit conditions.
nn Industrial, Automotive, Medical, Military, Avionics
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
20V TO 120V
20µF
5µF
1k
5Ω
0.1µF
10k
133k
1.21k
10µF
VINSNS
VIN
RUN
VINOV
NDRV
DRVCC
2.2µF
0.1µF
V5
SS
FREQ
56.2k
100pF
ITH
10k
10nF
BOOST1
SW1
TG1
BG1
SENSEP
LTC3779
SENSEN
SGND
PGND
BG2
BOOST2
SW2
TG2
IAVGSNSP
IAVGSNSN
VOUTSNS
VFB
0.22µF
15µH
100Ω
220pF
100Ω
4mΩ
0.22µF
100Ω
4.7µF 100Ω
1k
12.1k
4mΩ
30µF
VOUT
48V
10A
56µF
475k
3779 TA01a
Document Feedback
For more information www.analog.com
Efficiency and Power Loss
vs Input Voltage
100
30
98
24
EFFICIENCY
96
18
94
12
92
6
VOUT = 48V
POWER LOSS
IOUT = 10A
90
0
0 12 24 36 48 60 72 84 96 108 120
VIN VOLTAGE (V)
3779 TA01b
Rev A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3779HFE Datasheet

4-Switch Buck-Boost Controller

No Preview Available !

LTC3779
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN)........................ 150V to –0.3V
Topside Driver Voltage
BOOST1, BOOST2......................................161V to –0.3V
Switch Voltage SW1, SW2........................... 150V to –5V
RUN.......................................................... 150V to –0.3V
IAVGSNSP, IAVGSNSN.....................................150V to –10V
VINSNS, VOUTSNS....................................... 150V to –0.3V
EXTVCC Voltage......................................... 36V to –0.3V
NDRV Voltage..................................................... (Note 9)
DRVCC Voltage.............................................11V to –0.3V
BOOST1-SW1, BOOST2-SW2.......................11V to –0.3V
TG1-SW1, TG2-SW2, BG1, BG2........................... (Note 8)
V5 Voltage.................................................... 6V to –0.3V
MODE, PLLIN, SS, PGOOD........................... V5 to –0.3V
ITH, FREQ, DRVSET...................................... V5 to –0.3V
SENSEP, SENSEN, VINOV............................. V5 to –0.3V
VFB Voltage................................................ 2.7V to –0.3V
Operating Junction Temperature
Range (Notes 2, 3).................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
EXTVCC/DRVCC Peak Current...............................100mA
PIN CONFIGURATION
BG1 1
VINOV 2
DRVSET 3
SGND 4
EXTVCC 5
NDRV 6
DRVCC 7
V5 8
SS 9
VFB 10
SENSEP 11
SENSEN 12
ITH 13
SGND 14
MODE 15
PLLIN 16
FREQ 17
PGOOD 18
BG2 19
TOP VIEW
39
PGND
38 SW1
37 TG1
36 BOOST1
34 VIN
32 VINSNS
30 VOUTSNS
28 IAVGSNSN
26 IAVGSNSP
24 RUN
22 BOOST2
21 TG2
20 SW2
FE PACKAGE
VARIATION: FE38(31)
38-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 28°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS
ORDER INFORMATION http://www.linear.com/product/LTC3779#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3779EFE#PBF
LTC3779EFE#TRPBF
LTC3779FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3779IFE#PBF
LTC3779IFE#TRPBF
LTC3779FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3779HFE#PBF
LTC3779HFE#TRPBF
LTC3779FE
38-Lead Plastic TSSOP
–40°C to 150°C
Consult ADI Marketing for parts specified with wider operating temperature ranges.
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.
Rev A
2
For more information www.analog.com


Part Number LTC3779HFE
Description 4-Switch Buck-Boost Controller
Maker Analog Devices
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