Datasheet Linear Technology LTC3857EGN-1#PBF — Datenblatt

LTC3857-1
Low IQ, Dual, 2-Phase
Synchronous Step-Down
Controller
DESCRIPTION FEATURES n The LTC®3857-1 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the
ESR of the input capacitor ESR are minimized by operating
the two controller output stages out of phase. Low Operating IQ: 50μA (One Channel On)
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
Wide VIN Range: 4V to 38V
RSENSE or DCR Current Sensing
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes COUT
Phase-Lockable Frequency (75kHz-850kHz)
Programmable Fixed Frequency (50kHz-900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Loads
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitor …