Analog Devices LTC7802

Description

The LTC®7802 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant fre¬quency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7802 oper¬ates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase. The very low no-load quiescent current extends oper¬ating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be opti¬mized over a wide range of output capacitance and ESR values. The LTC7802 features a precision 0.8V reference and power good output indicators. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

Features

• Wide Input Voltage Range: 4.5V to 40V
• Wide Output Voltage Range: 0.8V to 99% - VIN
• Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On)
• Spread Spectrum Operation
• RSENSE or DCR Current Sensing
• Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
• Programmable Fixed Frequency (100kHz to 3MHz)
• Phase-Lockable Frequency (100kHz to 3MHz)
• Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode® Operation at Light Loads
• Very Low Dropout Operation: 99% Duty Cycle
• Power Good Output Voltage Monitors
• Output Overvoltage Protection
• Internal LDO Powers Gate Drive from VIN or EXTVCC
• Low Shutdown IQ: 1.5μA
• Small 28-Lead 4mm × 5mm QFN Package

Typical applications

• Automotive and Transportation
• Industrial
• Military/Avionics

More information

• Datasheet
• IC product information