April 16, 2015 – Linear Technology Korea (CEO Hong Sa-gwak) announced the release of a high-voltage dual-output synchronous step-down DC/DC controller (product name: LTC3892/-1) that consumes 29μA of quiescent current when one output is enabled and 34μA of quiescent current when two outputs are enabled. The input voltage range supporting 4.5V ~ 60V is designed to protect against high-voltage transients, ensuring continuous operation during automotive cold crank conditions and supporting a wide range of input sources and batteries. Each output provides high efficiency of 96%, allowing configuration from 0.8V to 99% of VIN at output currents of 20 amperes or higher. Therefore, it is ideal for 12V or 24V automotive, heavy equipment, industrial control, robotics, and telecommunications applications.

The LTC3892/-1's adjustable 5V ~ 10V gate driver allows the use of logic or standard-level MOSFETs to maximize efficiency. This product operates at a fixed frequency selectable between 50kHz ~ 900kHz and can be synchronized to an external clock of 75kHz ~ 850kHz. Users can select from continuous operation, pulse-skipping, or low ripple burst mode operation during light-load periods. The LTC3892/-1's 2-phase operation reduces input filtering and capacitance requirements. The product's current-mode architecture provides features including easy loop compensation, fast transient response, fixed frequency operation, excellent line regulation, and easy current sharing using parallel phases for higher currents. Output current sensing is achieved by measuring the voltage drop across the output inductor (DCR) for maximum efficiency or by using an optional sense resistor for higher accuracy. Current foldback limits MOSFET heating under overload conditions. This device is available in two versions. The LTC3892 is a fully-featured component with two power-good signals, adjustable current limit, and fixed 3.3V or 5V output voltage options.

The LTC3892 is available in a 32-pin 5mm x 5mm QFN package and the LTC3892-1 is available in a 28-pin TSSOP package. Offered in four temperature grades, this product guarantees extended and industrial grade ranges of –40 ~ 125°C, automotive high-temperature range of –40°C ~ 150°C, and military grade range of –55°C ~ 150°C. The price is set at $4.82 per unit based on a quantity of 1,000 units. For detailed information, refer to www.linear.com/product/LTC3892/-1.

High-Voltage Dual-Output DC/DC Step-Down Controller

Product Features: LTC3892/-1

·Wide input voltage range: 4.5V ~ 60V

·Wide output voltage range: 0.8V ~ 0.99VIN

·29μA quiescent current when one output is enabled & 34μA when two outputs are enabled

·Adjustable 5V ~ 10V gate drive voltage

·Synchronous rectification at maximum 95% efficiency

DCR or RSENSE current sensing

·Selectable low ripple burst mode operation, pulse-skipping, or continuous operation

·Selectable fixed operating frequency: 50kHz ~ 900kHz

·Phase-lockable frequency: 75kHz ~ 850kHz

·Current-mode control for fast transient response & easy loop compensation

·Adjustable soft-start

·Output overvoltage & overcurrent foldback protection

·Extended & industrial temperature grade: –40°C ~ 125°C operating junction temperature

·Automotive temperature grade: –40°C ~ 150°C operating junction temperature

·Military temperature grade: –55°C ~ 150°C operating junction temperature