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LT3757

Linear Technology Corporation
Part Number LT3757
Manufacturer Linear Technology Corporation
Description SEPIC And Inverting Controller
Published Jun 29, 2009
Detailed Description www.DataSheet4U.com LT3757 Boost, Flyback, SEPIC and Inverting Controller DESCRIPTION The LT®3757 is a wide input range...
Datasheet PDF File LT3757 PDF File

LT3757
LT3757

Overview
www.
DataSheet4U.
com LT3757 Boost, Flyback, SEPIC and Inverting Controller DESCRIPTION The LT®3757 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.
It can be configured as either a boost, flyback, SEPIC or inverting converter.
The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.
2V supply.
The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.
The operating frequency of LT3757 can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin.
A low minimum operating supply voltage of 2.
9V, and a low shutdown quiescent current of less than 1μA, make the LT3757 ideally suited for battery-operated systems.
The LT3757 features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit.
The device is available in a small 10-lead DFN (3mm × 3mm) or MSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES n n n n n n n n n n n Wide Input Voltage Range: 2.
9V to 40V Positive or Negative Output Voltage Programming with a Single Feedback Pin Current Mode Control Provides Excellent Transient Response Programmable Operating Frequency (100kHz-1MHz) with One External Resistor Synchronizeable to an External Clock Output Overvoltage Protection Low Shutdown Current < 1μA Internal 7.
2V Low Dropout Voltage Regulator Programmable Input Undervoltage Lockout with Hysteresis Programmable Soft-Start Small 10-Lead DFN (3mm × 3mm) and Thermally Enhanced 10-Pin MSOP Packages APPLICATIONS n n n Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters Telecom Power Supplies Portable Electronic Equipment TYPICAL APPLICATION High Efficienc...


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