Datasheet Linear Technology LT3742 — Datenblatt

LT3742
Dual, 2-Phase Step-Down
Switching Controller
Features n n n n n n n n Description 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 The LT®3742 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 LT3742 …