TPS54395PWP

The TPS54395 is a dual-channel, adaptive on-time D-CAP2™ mode synchronous buck converter. It helps system designers complete power bus regulator sets for various end devices with cost-effective, low component count, and low standby current solutions. The main control loop employs D-CAP2™ mode control, providing extremely fast transient response without external compensation components. Adaptive on-time control enables seamless transition between PWM mode under heavy load conditions and Eco-mode™ operation under light load. Eco-mode™ allows the TPS54395 to maintain high efficiency under light load conditions. It supports low ESR output capacitors such as POSCAP or SP-CAP, as well as ultra-low ESR ceramic capacitors. The device provides convenient and efficient operation with input voltages ranging from 4.5V to 18V. Available in a 4.4mm×5mm 16-pin TSSOP (PWP) package and a 4mm×4mm 16-pin VQFN (RSA) package, with a rated ambient operating temperature range of -40°C to 85°C. The TPS54395 is a 3A/3A dual synchronous step-down (buck) converter with two integrated N-channel MOSFETs for each channel. It operates using D-CAP2™ control mode. The fast transient response of D-CAP2™ control reduces the required output capacitance to meet a specific level of performance. Proprietary internal circuitry allows the use of low ESR output capacitors including ceramic and special polymer types. The main control loop of the TPS54395 is an adaptive on-time pulse width modulation (PWM) controller that supports a proprietary D-CAP2™ control mode. D-CAP2™ control combines constant on-time control with an internal compensation circuit for pseudo-fixed frequency and low external component count configuration with both low ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output. TPS54395 uses an adaptive on-time control scheme and does not have a dedicated on board oscillator. The TPS54395 runs with a pseudo-fixed frequency of 700 kHz by using the input voltage and output voltage to set the on-time timer. The TPS54395 is designed with Auto-Skip Eco-mode™ to increase light load efficiency.

Applications

• Point-of-load regulation for low-power systems in broad applications
• Digital TV power supplies
• Networked home terminal equipment
• Digital set-top boxes (STB)
• DVD players/recorders
• Game consoles and other devices

Key features

• D-CAP2™ control mode, fast transient response, no external components required for loop compensation, compatible with ceramic output capacitors
• Wide input voltage range: 4.5V to 18V
• Output voltage range: 0.76V to 7.0V
• Highly efficient integrated FETs optimized for low duty cycle applications, 90mΩ (high-side) and 60mΩ (low-side)
• High initial reference accuracy
• 3A continuous current supported on both channels
• Low-side rDS(on) low-loss current sensing
• Adjustable soft-start
• Non-sinking pre-biased soft-start
• 700kHz switching frequency
• Cycle-by-cycle overcurrent limit control
• Overcurrent limiting (OCL) / undervoltage lockout (UVLO) / thermal shutdown (TSD) protection
• Hiccup timer for overload protection
• Adaptive gate driver with integrated boost PMOS switch
• Constant OCP due to thermally compensated rDS(on) of 4000ppm/℃
• 16-pin HTSSOP and 16-pin VQFN packages
• Automatic skip Eco-mode™ for high efficiency at light loads