Analog Devices LTC3892

Description

The LTC®3892/LTC3892-1 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the twocontroller output stages out-of-phase.The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.A wide 4.5V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTILOOP ® compensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values.The 29μA no-load quiescent current extends operating run time in battery powered systems. For a comparision of the LTC3892 to the LTC3892-1, see Table 1 in the Pin Functions section of this data sheet.

Features

• Wide VIN Range: 4.5V to 60V (65V Abs Max)
• Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% - VIN
• Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
• No External Bootstrap Diodes Required
• Low Operating IQ: 29μA (One Channel On)
• Selectable Gate Drive UVLO Thresholds
• Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise
• Phase-Lockable Frequency: 75kHz to 850kHz
• Programmable Fixed Frequency: 50kHz to 900kHz
• Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads
• Selectable Current Limit (LTC3892)
• Very Low Dropout Operation: 99% Duty Cycle
• Power Good Output Voltage Monitors (LTC3892)
• Low Shutdown IQ: 3.6μA
• Small 32-Lead 5mm × 5mm QFN Package (LTC3892)
• Small 28-Lead TSSOP Package (LTC3892-1)

Typical applications

• Automotive and Industrial Power Systems
• High Voltage Battery Operated Systems
• Distributed DC Power Systems

More information

• Datasheet
• IC product information