The LT3742EUF is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs. A 500kHz fixed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting. The output stages of the two controllers operate 180° out of phase to reduce the input ripple current, minimizing the noise induced on the input supply, and allowing less input capacitance.
An internal boost regulator generates a bias rail of VIN + 7V to provide gate drive for the N-channel MOSFETs allowing low dropout and 100% duty cycle operation. The LT3742EUF can be used for applications where both controllers need to operate independently, or where both controllers are used to provide a single higher current output.
The device is available in a thermally enhanced 4mm × 4mm QFN package.
Feature
- Wide Input Voltage Range: 4V to 30V
- Wide Output Voltage Range: 0.8V to VIN
- Low Shutdown IQ: 20μA
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- 0.8V ±1.5% Voltage Reference
- 500kHz Current Mode Fixed Frequency Operation
- Internal Boost Converter Provides Bias Rail for N-Channel MOSFET Gate Drive
- Power Good Voltage Monitor for Each Output
- Programmable Soft-Start
- 24-Lead 4mm × 4mm × 0.75mm Package
Applications
- Satellite and Cable TV Set-Top Boxes
- Distributed Power Regulation
- Automotive Systems
- Super Capacitor Charger
(Picture: Pinout)
