The LT3957AIUHE#PBF is a wide input range, current mode DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.
The operating frequency of LT3957AIUHE#PBF 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 3V, and a low shutdown quiescent current of less than 1μA, make the LT3957AIUHE#PBF ideally suited for battery-powered systems.
The LT3957AIUHE#PBF features soft-start and frequency foldback functions to limit inductor current during start-up. The LT3957AIUHE#PBF has improved load transient performance compared to the LT3957.
FeaturesLT3957-LT3957AImproved Load Transient PerformanceFeature
- Wide Input Voltage Range: 3V to 40V
- Single Feedback Pin for Positive or Negative Output Voltage
- Internal 5A/40V Power Switch
- 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 5.2V Low Dropout Voltage Regulator
- Programmable Input Undervoltage Lockout with Hysteresis
- Programmable Soft-Start
- Thermally Enhanced QFN (5mm × 6mm) Package
Applications
- Automotive
- Telecom
- Industrial
(Picture: Pinout)
