Analog Devices announces the launch of Power by Linear™ LTC3894, a high-voltage step-down DC/DC controller that consumes only 9µA of standby current when operating in Burst Mode®.

The new product features a wide input voltage range of 4.5V to 150V, eliminating the need for external surge suppression devices. The LTC3894 operates at 100% duty cycle and supports externally adjustable power good window, making it ideal for battery-powered systems that operate continuously even during dropout conditions.

The LTC3894 is well-suited for transportation systems, always-on power, industrial control, robotics, and data communication applications.

The LTC3894 drives P-channel MOSFETs and generates output voltages from 0.8V to 60V with peak efficiency of 92% at maximum output current of 3A. The LTC3894 optionally provides an external N-channel pass FET to supply PMOS gate driver current in continuous high-voltage, high-power applications.

The LTC3894 operates at selectable fixed frequencies from 50kHz to 850kHz and can be synchronized to external clocks in the range of 75kHz to 800kHz. Users can choose between pulse-skipping mode or Burst Mode under light load conditions.

Thanks to the current mode architecture, easy loop compensation, fast transient response, and excellent line regulation are achievable. Current sensing can be performed by detecting the voltage drop across the output inductor (DCR) for maximum efficiency or by using an optional sense resistor.

With a minimum on-time as low as 100ns, excellent step-down ratios are achieved even at high switching frequencies. Current foldback limits MOSFET heat dissipation during overload conditions. Additionally, adjustable input overvoltage lockout (OVLO), power good output signal, and soft start function are provided.

The LTC3894 is offered in a 16-pin TSSOP package with pin spacing and enhanced thermal performance for high-voltage applications, and is available in extended and industrial versions with operating temperature ranges of –40°C to 125°C.

Key Features of LTC3894

• Wide input voltage range: 4.5V to 150V

• Wide output voltage range: 0.8V to 60V

• Low burst mode VIN standby current consumption of 9µA at 48V input, 3.3V output

• RSENSE or inductor DCR current sensing

• Programmable power good overvoltage monitoring

• Internal fixed soft-start or external programmable soft-start or voltage tracking

• Operates at selectable fixed frequency from 50kHz to 850kHz

• Operating frequency can be synchronized to external PLL at 75kHz to 800kHz

• Fast transient response and easy loop compensation through current mode control architecture

• Adjustable soft-start or tracking

• Output overvoltage and overcurrent protection

• Power good output signal

• External NMOS option for gate driver bias current