Datasheet LTC3637 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 76V, 1A Step-Down Regulator |
| Seiten / Seite | 26 / 1 — FEATURES. DESCRIPTION. Wide Operating Input Voltage Range: 4V to 76V. … |
| Dateiformat / Größe | PDF / 360 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Wide Operating Input Voltage Range: 4V to 76V. Internal 350mΩ Power MOSFET. No Compensation Required
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LTC3637 76V, 1A Step-Down Regulator
FEATURES DESCRIPTION
n
Wide Operating Input Voltage Range: 4V to 76V
The LTC®3637 is a high efficiency step-down DC/DC n
Internal 350mΩ Power MOSFET
regulator with an internal high side power switch that n
No Compensation Required
draws only 12μA DC supply current while maintaining a n
Adjustable 100mA to 1A Maximum Output Current
regulated output voltage at no load. n Low Dropout Operation: 100% Duty Cycle The LTC3637 can supply up to 1A load current and features n Low Quiescent Current: 12µA a programmable peak current limit that provides a simple n Wide Output Range: 0.8V to VIN method for optimizing efficiency and for reducing output n 0.8V ±1% Feedback Voltage Reference ripple and component size. The LTC3637’s combination n Precise RUN Pin Threshold of Burst Mode® operation, integrated power switch, low n Internal and External Soft-Start quiescent current, and programmable peak current limit n Programmable 1.8V, 3.3V, 5V or Adjustable Output provides high efficiency over a broad range of load currents. n Few External Components Required n Programmable Input Overvoltage Lockout With its wide input range of 4V to 76V, and programmable n Low Profile (0.75mm) 3mm × 5mm DFN and overvoltage lockout, the LTC3637 is a robust regulator Thermally-Enhanced MSE16 Packages suited for regulating from a wide variety of power sources. Additionally, the LTC3637 includes a precise run threshold and soft-start feature to guarantee that the power system
APPLICATIONS
start-up is well-controlled in any environment. n Industrial Control Supplies The LTC3637 is available in the thermal y-enhanced n Medical Devices 3mm n × 5mm DFN and the MSE16 packages. Distributed Power Systems n Portable Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n Battery-Operated Devices owners. n Automotive n Avionics
TYPICAL APPLICATION Efficiency and Power Loss vs Load Current 12.5V to 76V Input to 12V Output, 1A Regulator
100 VOUT = 12V EFFICIENCY 90 10µH VOUT V 80 IN VIN SW 12V 12.5V TO 76V POWER LOSS (mW) 70 2.2µF 47µF 1A LTC3637 200k 60 1000 RUN VFB 50 SS 35.7k 40 POWER LOSS 100 FBO VPRG1 EFFICIENCY (%) VPRG2 30 OVLO ISET 20 10 V GND IN = 24V 10 VIN = 48V V 3637 TA01a IN = 76V 0 0 0.1 1.0 10 100 1000 LOAD CURRENT (mA) 3637 TA01b 3637fa For more information www.linear.com/LTC3637 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Wide Operating Input Voltage Range: 4V to 76V
The LTC®3637 is a high efficiency step-down DC/DC n
Internal 350mΩ Power MOSFET
regulator with an internal high side power switch that n
No Compensation Required
draws only 12μA DC supply current while maintaining a n
Adjustable 100mA to 1A Maximum Output Current
regulated output voltage at no load. n Low Dropout Operation: 100% Duty Cycle The LTC3637 can supply up to 1A load current and features n Low Quiescent Current: 12µA a programmable peak current limit that provides a simple n Wide Output Range: 0.8V to VIN method for optimizing efficiency and for reducing output n 0.8V ±1% Feedback Voltage Reference ripple and component size. The LTC3637’s combination n Precise RUN Pin Threshold of Burst Mode® operation, integrated power switch, low n Internal and External Soft-Start quiescent current, and programmable peak current limit n Programmable 1.8V, 3.3V, 5V or Adjustable Output provides high efficiency over a broad range of load currents. n Few External Components Required n Programmable Input Overvoltage Lockout With its wide input range of 4V to 76V, and programmable n Low Profile (0.75mm) 3mm × 5mm DFN and overvoltage lockout, the LTC3637 is a robust regulator Thermally-Enhanced MSE16 Packages suited for regulating from a wide variety of power sources. Additionally, the LTC3637 includes a precise run threshold and soft-start feature to guarantee that the power system
APPLICATIONS
start-up is well-controlled in any environment. n Industrial Control Supplies The LTC3637 is available in the thermal y-enhanced n Medical Devices 3mm n × 5mm DFN and the MSE16 packages. Distributed Power Systems n Portable Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n Battery-Operated Devices owners. n Automotive n Avionics
TYPICAL APPLICATION Efficiency and Power Loss vs Load Current 12.5V to 76V Input to 12V Output, 1A Regulator
100 VOUT = 12V EFFICIENCY 90 10µH VOUT V 80 IN VIN SW 12V 12.5V TO 76V POWER LOSS (mW) 70 2.2µF 47µF 1A LTC3637 200k 60 1000 RUN VFB 50 SS 35.7k 40 POWER LOSS 100 FBO VPRG1 EFFICIENCY (%) VPRG2 30 OVLO ISET 20 10 V GND IN = 24V 10 VIN = 48V V 3637 TA01a IN = 76V 0 0 0.1 1.0 10 100 1000 LOAD CURRENT (mA) 3637 TA01b 3637fa For more information www.linear.com/LTC3637 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts