Datasheet LT3759 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Wide Input Voltage Range Boost/SEPIC/Inverting Controller |
| 页数 / 页 | 32 / 1 — FEATURES. DESCRIPTION. Wide VIN Range: 1.6V to 42V. Positive or Negative … |
| 文件格式/大小 | PDF / 450 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Wide VIN Range: 1.6V to 42V. Positive or Negative Output Voltage Programming. with a Single Feedback Pin
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LT3759 Wide Input Voltage Range Boost/SEPIC/Inverting Controller
FEATURES DESCRIPTION
n
Wide VIN Range: 1.6V to 42V
The LT®3759 is a wide input range, current mode, DC/DC n
Positive or Negative Output Voltage Programming
controller which is capable of regulating either positive or
with a Single Feedback Pin
negative output voltages from a single feedback pin. It can n
PGOOD Output Voltage Status Report
be configured as a boost, SEPIC or inverting converter. n Accurate 50mV SENSE Threshold Voltage The LT3759 drives a low side external N-channel power n Programmable Soft-Start MOSFET. An internal LDO regulator draws power from n Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor VIN or DRIVE to provide up to a 4.75V supply for the gate driver. The fixed frequency, current-mode architecture n Synchronizable to an External Clock results in stable operation over a wide range of supply n Low Shutdown Current < 1µA and output voltages. The operating frequency of LT3759 n INTVCC Regulator Supplied from VIN or DRIVE can be set over a 100kHz to 1MHz range with an external n Programmable Input Undervoltage Lockout with Hysteresis resistor, or can be synchronized to an external clock using the SYNC pin.
APPLICATIONS
The LT3759 features soft-start and frequency foldback functions to limit inductor current during start-up and n Datacom and Industrial Boost, SEPIC and Inverting Converters output short-circuit. A window comparator on the FBX pin reports via the PGOOD pin, providing output voltage status n Distributed Power Supplies indication. The device is available in a 12-Lead exposed n Portable Electronic Equipment pad MSOP package. n Automotive L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7825665.
TYPICAL APPLICATION 2.5V to 36V Input, 12V Output SEPIC Converter Excellent for Automotive 12V Post Regulator Efficiency vs Output Current
4.7µF ×2 L1A VOUT 100 VIN 12V VIN = 12V 2.5V TO 0.5A, 2.5V ≤ VIN ≤ 8V 36V CIN 2A, 8V < V 105k V IN ≤ 36V 95 4.7µF IN ×4 COUT1 EN/UVLO GATE L1B M1 10µF 90 100k 118k SENSE LT3759 5mΩ 85 PGOOD EFFICIENCY (%) DRIVE TIE TO GND SYNC IF NOT USED 80 105K RT + C SS FBX OUT2 75 41.2k 47µF 0 0.5 1 1.5 2 2.5 VC GND INTV 200kHz CC ×4 OUTPUT CURRENT (A) 3759 TA01b 0.1µF 7.5k 15.8K 22nF 4.7µF 3759 TA01a 3759fc For more information www.linear.com/3759 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts
FEATURES DESCRIPTION
n
Wide VIN Range: 1.6V to 42V
The LT®3759 is a wide input range, current mode, DC/DC n
Positive or Negative Output Voltage Programming
controller which is capable of regulating either positive or
with a Single Feedback Pin
negative output voltages from a single feedback pin. It can n
PGOOD Output Voltage Status Report
be configured as a boost, SEPIC or inverting converter. n Accurate 50mV SENSE Threshold Voltage The LT3759 drives a low side external N-channel power n Programmable Soft-Start MOSFET. An internal LDO regulator draws power from n Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor VIN or DRIVE to provide up to a 4.75V supply for the gate driver. The fixed frequency, current-mode architecture n Synchronizable to an External Clock results in stable operation over a wide range of supply n Low Shutdown Current < 1µA and output voltages. The operating frequency of LT3759 n INTVCC Regulator Supplied from VIN or DRIVE can be set over a 100kHz to 1MHz range with an external n Programmable Input Undervoltage Lockout with Hysteresis resistor, or can be synchronized to an external clock using the SYNC pin.
APPLICATIONS
The LT3759 features soft-start and frequency foldback functions to limit inductor current during start-up and n Datacom and Industrial Boost, SEPIC and Inverting Converters output short-circuit. A window comparator on the FBX pin reports via the PGOOD pin, providing output voltage status n Distributed Power Supplies indication. The device is available in a 12-Lead exposed n Portable Electronic Equipment pad MSOP package. n Automotive L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and No RSENSE are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7825665.
TYPICAL APPLICATION 2.5V to 36V Input, 12V Output SEPIC Converter Excellent for Automotive 12V Post Regulator Efficiency vs Output Current
4.7µF ×2 L1A VOUT 100 VIN 12V VIN = 12V 2.5V TO 0.5A, 2.5V ≤ VIN ≤ 8V 36V CIN 2A, 8V < V 105k V IN ≤ 36V 95 4.7µF IN ×4 COUT1 EN/UVLO GATE L1B M1 10µF 90 100k 118k SENSE LT3759 5mΩ 85 PGOOD EFFICIENCY (%) DRIVE TIE TO GND SYNC IF NOT USED 80 105K RT + C SS FBX OUT2 75 41.2k 47µF 0 0.5 1 1.5 2 2.5 VC GND INTV 200kHz CC ×4 OUTPUT CURRENT (A) 3759 TA01b 0.1µF 7.5k 15.8K 22nF 4.7µF 3759 TA01a 3759fc For more information www.linear.com/3759 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts