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LTC1149

Features: Operation to 48V Input Voltage Ultrahigh Efficiency: Up to 95% Current Mode Operation for Excellent Line andLoad Transient Response High Efficiency Maintained over Wide Current Range Logic-Controlled Micropower Shutdown Short-Circuit Protection Very Low Dropout Operation: 100% Duty Cycl...

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SeekIC No. : 004401399 Detail

LTC1149: Features: Operation to 48V Input Voltage Ultrahigh Efficiency: Up to 95% Current Mode Operation for Excellent Line andLoad Transient Response High Efficiency Maintained over Wide Current Range Logi...

LTC1149 Data Sheet

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Part Number:
LTC1149
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Operation to 48V Input Voltage
Ultrahigh Efficiency: Up to 95%
Current Mode Operation for Excellent Line andLoad Transient Response
High Efficiency Maintained over Wide Current Range
Logic-Controlled Micropower Shutdown
Short-Circuit Protection
Very Low Dropout Operation: 100% Duty Cycle
Synchronous FET Switching for High Efficiency
Adaptive Nonoverlap Gate Drives
Available in 16-Pin Narrow SO Package


Application

Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies


Pinout

Connection Diagram


Specifications

Input Supply Voltage (Pin 2) ......................  15V to 60V
VCC Output Current (Pin 3) ...................................  50mA
VCC Input Voltage (Pin 5) ........................................  16V
Continuous Output Current (Pins 4, 13) ...............  50mA
Sense Voltages (Pins 8, 9).
VIN 12.7V .............................................  13V to 0.3V
VIN < 12.7V.................................  (VCC + 0.3V) to 0.3V
Shutdown Voltages (Pins 10, 15) .............................  7V
Operating Temperature Range ...............  0°C to 70°C
Extended Commercial
Temperature Range ...........................  40°C to 85°C
Junction Temperature (Note 1) ..........................  125°C
Storage Temperature Range ............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................  300°C


Description

The LTC®1149 series is a family of synchronous step-down switching regulator controllers featuring automaticBurst ModeTMoperation to maintain high efficiencies atlow output currents. The LTC1149 series drive external comple-mentary power MOSFETs at switching frequencies upto 250kHz using a constant off-time current-mode archi-tecture.

Special onboard regulation and level-shift circuitry allowoperation at input voltages from dropout to 48V (60Vabsolute max). The constant off-time architecture main-tains constant ripple current in the inductor, easing thedesign of wide input range converters. Current modeoperation provides excellent line and load transientresponse. The operating current level is user-program-mable via an external current sense resistor.

The LTC1149 series incorporates automatic power savingBurst Modeoperation when load currents drop below thelevel required for continuous operation. Standby power isreduced to only about 8mW at VIN = 12V. In shutdown,both MOSFETs are turned off.




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