Datasheet LTC3779 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller |
| Pages / Page | 38 / 1 — FEATURES. DESCRIPTION. 4-Switch Current Mode Single Inductor … |
| Revision | A |
| File Format / Size | PDF / 2.6 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. 4-Switch Current Mode Single Inductor Architecture. Allows V. IN Above, Below or Equal to VOUT. Wide V
Model Line for this Datasheet
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LTC3779 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller
FEATURES DESCRIPTION
n
4-Switch Current Mode Single Inductor Architecture
The LTC®3779 is a high performance buck-boost switching
Allows V
regulator controller that operates from input voltages
IN Above, Below or Equal to VOUT
n
Wide V
above, below or equal to the output voltage. The constant
IN Range: 4.5V to 150V
n
Wide Output Voltage Range: 1.2V ≤ V
frequency current mode architecture allows a phase-
OUT ≤ 150V
n lockable frequency of up to 600kHz, while an input/
Synchronous Rectification: Up to 99% Efficiency
n output constant-current loop provides support for battery
±1% 1.2V Voltage Reference
n charging.
Input or Output Average Current Limit
n
Onboard LDO or External NMOS LDO for DRVCC
With a wide 4.5V to 150V input and output range and n
36V EXTVCC LDO Powers Drivers
seamless transfers between operating regions, the n
Programmable 6V to 10V DRV
LTC3779 is ideal for automotive, telecom and battery-
CC Optimizes Efficiency
n No Top FET Refresh Noise in Boost or Buck Mode powered systems. n VOUT Disconnected from VIN During Shutdown The LTC3779 features a precision 1.2V reference and n Phase-Lockable Fixed Frequency (50kHz to 600kHz) power good output indicator. The MODE pin can select n No Reverse Current During Start-Up between pulse-skipping mode or forced continuous mode n Power Good Output Voltage Monitor of operation. Pulse-skipping mode offers high efficiency n 150V Rated RUN Pin with Accurate Turn-On Threshold at light load while forced continuous mode operates at n Programmable Input Overvoltage Lockout a constant frequency for noise sensitive applications. n Thermally Enhanced FE38 TSSOP Package Modified The PLLIN pin allows the IC to be synchronized to an for High Voltage Operation external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat
APPLICATIONS
dissipation during short-circuit conditions. n Industrial, Automotive, Medical, Military, Avionics All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN 20V TO 120V 4mΩ VOUT 20µF 5µF 48V 10A
Efficiency and Power Loss
30µF 1k 56µF
vs Input Voltage
VINSNS BOOST1 5Ω VIN 0.22µF 100 30 15µH 0.1µF SW1 TG1 10k 98 24 RUN BG1 133k EFFICIENCY POWER LOSS (W) VINOV 475k 100Ω 1.21k SENSEP 96 18 220pF 4mΩ NDRV SENSEN DRVCC SGND 100Ω LTC3779 94 12 PGND 10µF EFFICIENCY (%) BG2 V5 BOOST2 92 6 2.2µF SS 0.22µF VOUT = 48V POWER LOSS 0.1µF FREQ IOUT = 10A SW2 90 0 56.2k TG2 100Ω 0 12 24 36 48 60 72 84 96 108 120 IAVGSNSP VIN VOLTAGE (V) 4.7µF 3779 TA01b I 100Ω TH IAVGSNSN 10k 1k 100pF VOUTSNS 10nF VFB 3779 TA01a 12.1k Rev A Document Feedback For more information www.analog.com 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
FEATURES DESCRIPTION
n
4-Switch Current Mode Single Inductor Architecture
The LTC®3779 is a high performance buck-boost switching
Allows V
regulator controller that operates from input voltages
IN Above, Below or Equal to VOUT
n
Wide V
above, below or equal to the output voltage. The constant
IN Range: 4.5V to 150V
n
Wide Output Voltage Range: 1.2V ≤ V
frequency current mode architecture allows a phase-
OUT ≤ 150V
n lockable frequency of up to 600kHz, while an input/
Synchronous Rectification: Up to 99% Efficiency
n output constant-current loop provides support for battery
±1% 1.2V Voltage Reference
n charging.
Input or Output Average Current Limit
n
Onboard LDO or External NMOS LDO for DRVCC
With a wide 4.5V to 150V input and output range and n
36V EXTVCC LDO Powers Drivers
seamless transfers between operating regions, the n
Programmable 6V to 10V DRV
LTC3779 is ideal for automotive, telecom and battery-
CC Optimizes Efficiency
n No Top FET Refresh Noise in Boost or Buck Mode powered systems. n VOUT Disconnected from VIN During Shutdown The LTC3779 features a precision 1.2V reference and n Phase-Lockable Fixed Frequency (50kHz to 600kHz) power good output indicator. The MODE pin can select n No Reverse Current During Start-Up between pulse-skipping mode or forced continuous mode n Power Good Output Voltage Monitor of operation. Pulse-skipping mode offers high efficiency n 150V Rated RUN Pin with Accurate Turn-On Threshold at light load while forced continuous mode operates at n Programmable Input Overvoltage Lockout a constant frequency for noise sensitive applications. n Thermally Enhanced FE38 TSSOP Package Modified The PLLIN pin allows the IC to be synchronized to an for High Voltage Operation external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat
APPLICATIONS
dissipation during short-circuit conditions. n Industrial, Automotive, Medical, Military, Avionics All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN 20V TO 120V 4mΩ VOUT 20µF 5µF 48V 10A
Efficiency and Power Loss
30µF 1k 56µF
vs Input Voltage
VINSNS BOOST1 5Ω VIN 0.22µF 100 30 15µH 0.1µF SW1 TG1 10k 98 24 RUN BG1 133k EFFICIENCY POWER LOSS (W) VINOV 475k 100Ω 1.21k SENSEP 96 18 220pF 4mΩ NDRV SENSEN DRVCC SGND 100Ω LTC3779 94 12 PGND 10µF EFFICIENCY (%) BG2 V5 BOOST2 92 6 2.2µF SS 0.22µF VOUT = 48V POWER LOSS 0.1µF FREQ IOUT = 10A SW2 90 0 56.2k TG2 100Ω 0 12 24 36 48 60 72 84 96 108 120 IAVGSNSP VIN VOLTAGE (V) 4.7µF 3779 TA01b I 100Ω TH IAVGSNSN 10k 1k 100pF VOUTSNS 10nF VFB 3779 TA01a 12.1k Rev A Document Feedback For more information www.analog.com 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
