The LT3757/LT3757AEMSE are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They can be configured as either a boost, flyback, SEPIC or inverting converter. The LT3757/LT3757AEMSE drive 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/LT3757AEMSE 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/LT3757AEMSE ideally suited for battery-operated systems.
The LT3757/LT3757AEMSE feature soft-start and frequency foldback functions to limit inductor current during startup and output short-circuit. The LT3757AEMSE has improved load transient performance compared to the LT3757.
Feature
- 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 to 1MHz) with One External Resistor
- Synchronizable to an External Clock
- 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
- Automotive and Industrial Boost, Flyback, SEPIC and Inverting Converters
- Telecom Power Supplies
- Portable Electronic Equipment
