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LTC3777ELXE Datasheet

4-Switch Buck-Boost Controller

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LTC3777
150V VIN and VOUT Synchronous
4-Switch Buck-Boost Controller +
Switching Bias Supply
FEATURES
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 Integrated 12µA IQ, 150V, 85mA, Switching Bias
for Optimal Thermal Performance
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 150V Rated RUN Pin with Accurate Turn-On Threshold
nn Thermally Enhanced 48-Lead e-LQFP Package
APPLICATIONS
nn Industrial, Transportation, Medical, Military, Avionics
All registered trademarks and trademarks are the property of their respective owners.
DESCRIPTION
The LTC®3777 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. The
150V integrated switching bias supply is a high efficiency
step-down regulator that draws only 12µA typical DC supply
current with a regulated output voltage at no load.
With a wide 4.5V to 150V input and output range and
seamless transfers between operating regions, the
LTC3777 is ideal for industrial, telecom and battery-
powered systems.
The LTC3777 features a power good output indicator
and a MODE pin to select between pulse-skipping mode
or forced continuous mode of operation. 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.
TYPICAL APPLICATION
VIN
16V TO 120V
20µF
5µF
1k
0.1µF
133k 10µF
1.21k
BVOUT
12V
85mA
44µF
1µF
220µH
715k 51.1k
1µF
10k
2.2µF 100k
0.1µF
56.2k
VINSNS
BOOST1
VIN
DRVCC
SW1
TG1
LTC3777 BG1
VINOV
BVIN
BOV
BRUN
BSW
BVFB
BGND
EXTVCC
SENSEP
SENSEN
SGND
PGND
BG2
BOOST2
SW2
TG2
IAVGSNSP
RUN
PGOOD
V5
SS
FREQ
IAVGSNSN
VOUTSNS
VFB
ITH
MODE
PLLIN
Document Feedback
0.22µF
30µF
15µH
4mΩ
100Ω
220pF 100Ω
4mΩ
VOUT
48V, 10A
56µF
Efficiency and Power Loss
vs Input Voltage
100
30
98
24
EFFICIENCY
475k
96
18
0.22µF
4.7µF 100Ω
1k
100Ω
100pF
12.1k
10k 10nF
3777 TA01a
For more information www.analog.com
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)
3777 TA01b
Rev A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3777ELXE Datasheet

4-Switch Buck-Boost Controller

No Preview Available !

LTC3777
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN), BVIN............... 150V to –0.3V
Topside Driver Voltage
BOOST1, BOOST2......................................161V to –0.3V
Switch Voltage SW1, SW2........................... 150V to –5V
RUN, BRUN............................................... 150V to –0.3V
IAVGSNSP, IAVGSNSN.....................................150V to –10V
VINSNS, VOUTSNS....................................... 150V to –0.3V
EXTVCC Voltage......................................... 36V to –0.3V
DRVCC Voltage.............................................11V to –0.3V
BOOST1-SW1, BOOST2-SW2.......................11V to –0.3V
TG1-SW1, TG2-SW2, BG1, BG2........................... (Note 8)
V5, BOV, BFBO, BVFB, BISET 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
TOP VIEW
BRUN 1
NC 2
BSW 3
NC 4
BVIN 5
NC 6
BOV 7
BFBO 8
NC 9
BGND 10
BISET 11
BVFB 12
49
PGND
36 VIN
35 NC
34 VINSNS
33 NC
32 VOUTSNS
31 NC
30 IAVGSNSN
29 IAVGSNSP
28 NC
27 RUN
26 NC
25 BOOST2
LXE PACKAGE
48-LEAD (7mm × 7mm) PLASTIC e-LQFP
TJMAX = 150°C, θJA = 36°C/W
EXPOSED PAD (PIN 49) IS PGND, MUST BE SOLDERED TO PCB
FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS
ORDER INFORMATION
LEAD FREE FINISH
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3777ELXE#PBF
LTC3777 LXE
48-Lead (7mm × 7mm) Plastic e-LQFP
–40°C to 125°C
LTC3777ILXE#PBF
LTC3777 LXE
48-Lead (7mm × 7mm) Plastic e-LQFP
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. 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 LTC3777ELXE
Description 4-Switch Buck-Boost Controller
Maker Analog Devices
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