LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
Features
·
· Positive or Negative Output Voltage Programming with a Single Feedback Pin
· Current Mode Control Provides Excellent Transient Response
· Programmable Operating Frequency (100kHz to 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 (
Typical Application
Description
The LT3758 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 LT3758 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 LT3758 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 minimum operating supply voltage of 5.5V, and a low shutdown quiescent current of less than 1μA, make the LT3758 ideally suited for battery-powered systems.
The LT3758 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 (
Packaging
DFN-10, MS-10
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