LTC3850GN Dual Rectifier Diode 2-Phase Synchronous Step-Down Switching Controller 2a

LTC3850GN Dual, 2-Phase Synchronous Step-Down Switching Controller 2a rectifier diode

FEATURES

►Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

►High Effi ciency: Up to 95%

►RSENSE or DCR Current Sensing

►±1% 0.8V Output Voltage Accuracy

► Phase-Lockable Fixed Frequency 250kHz to 780kHz

► Supports Pre-Biased Output

► Dual N-Channel MOSFET Synchronous Drive

► Wide VIN Range: 4V to 24V (30V for LTC3850I) Operation

► Adjustable Soft-Start Current Ramping or Tracking

► Foldback Output Current Limiting

►Output Overvoltage Protection

►Power Good Output Voltage Monitor

► 28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow SSOP Packages

DESCRIPTION

The LTC®3850 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and supply noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3850 features a precision 0.8V reference and a power good output indicator. A wide 4V to 24V (28V maximum/30V for LTC3850I) input supply range encompasses most battery chemistries and intermediate bus voltages.

Independent TK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock. The LTC3850 is available in low profi le 28-pin 4mm × 4mm, 4mm × 5mm QFN and narrow SSOP packages.

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