Datasheet LT3791-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 60V 4-Switch Synchronous Buck-Boost Controller |
| Pages / Page | 26 / 1 — FeaTures. DescripTion. 4-Switch Single Inductor Architecture Allows VIN. … |
| File Format / Size | PDF / 312 Kb |
| Document Language | English |
FeaTures. DescripTion. 4-Switch Single Inductor Architecture Allows VIN. Above, Below or Equal to VOUT
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LT3791-1 60V 4-Switch Synchronous Buck-Boost Controller
FeaTures DescripTion
n
4-Switch Single Inductor Architecture Allows VIN
The LT®3791-1 is a synchronous 4-switch buck-boost volt-
Above, Below or Equal to VOUT
age/current regulator controller. The controller can regulate n
Synchronous Switching: Up to 98.5% Efficiency
output voltage, output current, or input current with input n
Wide VIN Range: 4.7V to 60V
voltages above, below, or equal to the output voltage. The n
2% Output Voltage Accuracy: 1.2V ≤ VOUT < 60V
constant-frequency, current mode architecture allows its n
6% Output Current Accuracy: 0V ≤ VOUT < 60V
frequency to be adjusted or synchronized from 200kHz n Input and Output Current Regulation with Current to 700kHz. No top FET refresh switching cycle is needed Monitor Outputs in buck or boost operation. With 60V input, 60V output n No Top FET Refresh in Buck or Boost capability and seamless transitions between operating n VOUT Disconnected from VIN During Shutdown regions, the LT3791-1 is ideal for voltage regulator, bat- n C/10 Charge Termination and Output Shorted Flags tery/super-capacitor charger applications in automotive, n Capable of 100W or greater per IC industrial, telecom, and even battery-powered systems. n 38-Lead TSSOP with Exposed Pad For new designs we recommend the LT8390: 60V synchro- nous 4-switch buck-boost controller due to its numerous
applicaTions
performance improvements over the LT3791-1. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog n Automotive, Telecom, Industrial Systems Devices, Inc. All other trademarks are the property of their respective owners. n High Power Battery-Powered System
Typical applicaTion 120W (24V 5A) Buck-Boost Voltage Regulator
VIN 0.003Ω 12V TO 58V + 4.7µF 47µF VIN INTVCC 100V 80V 1µF 4.7µF 50Ω BST2 + IVINN 220µF 470nF 35V
Efficiency vs Load Current
IVINP 0.015Ω V BST1 0.1µF OUT 100 24V TEST1 499k 499k 4.7µF 5A TG1 0.1µF 50V 95 EN/UVLO ×2 SWI 73.2k 90 OVLO 10µH BG1 56.2k 27.4k INTVCC 85 3.83k LT3791-1 SNSP 100k 200k 80 SHORT 0.004Ω EFFICIENCY (%) 75 C/10 SNSN CCM PGND 70 IVINMON VIN = 12V BG2 65 ISMON VIN = 24V V CLKOUT SW2 IN = 54V 60 PWMOUT TG2 0 1 2 3 4 5 VREF ISP LOAD CURRENT (A) 0.1µF 37911 TA01b PWM ISN 100k CTRL SS SYNC V FB C RT SGND 37911 TA01a 5.1k 147k 33nF 200kHz 10nF 37911fb For more information www.linear.com/LT3791-1 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts
FeaTures DescripTion
n
4-Switch Single Inductor Architecture Allows VIN
The LT®3791-1 is a synchronous 4-switch buck-boost volt-
Above, Below or Equal to VOUT
age/current regulator controller. The controller can regulate n
Synchronous Switching: Up to 98.5% Efficiency
output voltage, output current, or input current with input n
Wide VIN Range: 4.7V to 60V
voltages above, below, or equal to the output voltage. The n
2% Output Voltage Accuracy: 1.2V ≤ VOUT < 60V
constant-frequency, current mode architecture allows its n
6% Output Current Accuracy: 0V ≤ VOUT < 60V
frequency to be adjusted or synchronized from 200kHz n Input and Output Current Regulation with Current to 700kHz. No top FET refresh switching cycle is needed Monitor Outputs in buck or boost operation. With 60V input, 60V output n No Top FET Refresh in Buck or Boost capability and seamless transitions between operating n VOUT Disconnected from VIN During Shutdown regions, the LT3791-1 is ideal for voltage regulator, bat- n C/10 Charge Termination and Output Shorted Flags tery/super-capacitor charger applications in automotive, n Capable of 100W or greater per IC industrial, telecom, and even battery-powered systems. n 38-Lead TSSOP with Exposed Pad For new designs we recommend the LT8390: 60V synchro- nous 4-switch buck-boost controller due to its numerous
applicaTions
performance improvements over the LT3791-1. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog n Automotive, Telecom, Industrial Systems Devices, Inc. All other trademarks are the property of their respective owners. n High Power Battery-Powered System
Typical applicaTion 120W (24V 5A) Buck-Boost Voltage Regulator
VIN 0.003Ω 12V TO 58V + 4.7µF 47µF VIN INTVCC 100V 80V 1µF 4.7µF 50Ω BST2 + IVINN 220µF 470nF 35V
Efficiency vs Load Current
IVINP 0.015Ω V BST1 0.1µF OUT 100 24V TEST1 499k 499k 4.7µF 5A TG1 0.1µF 50V 95 EN/UVLO ×2 SWI 73.2k 90 OVLO 10µH BG1 56.2k 27.4k INTVCC 85 3.83k LT3791-1 SNSP 100k 200k 80 SHORT 0.004Ω EFFICIENCY (%) 75 C/10 SNSN CCM PGND 70 IVINMON VIN = 12V BG2 65 ISMON VIN = 24V V CLKOUT SW2 IN = 54V 60 PWMOUT TG2 0 1 2 3 4 5 VREF ISP LOAD CURRENT (A) 0.1µF 37911 TA01b PWM ISN 100k CTRL SS SYNC V FB C RT SGND 37911 TA01a 5.1k 147k 33nF 200kHz 10nF 37911fb For more information www.linear.com/LT3791-1 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts
