LTC1504ACS8#PBF

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The low-cost and high-performance LTC1504ACS8#PBF buck converter from Linear Technology belongs to the PMIC – Voltage Regulators – DC DC Switching Regulators category. This device is a highly integrated and efficient, fully-protected synchronous buck DC/DC converter that provides up to 6A of load current. It is ideal for industrial, networking, communications, as well as, portable and consumer applications.

The LTC1504ACS8#PBF has an operating input voltage up to 10V and is capable of providing regulated output voltages as low as 0.8V. In addition, it has a wide switching frequency range from 200kHz to 2.2MHz. This allows designers to optimize performance and reduce external BOM cost according to the specific application. Furthermore, the LTC1504ACS8#PBF is capable of over 95% efficiency and can operate in both continuous and discontinuous modes.

The device integrates many features to enhance performance, protect loads, and ensure stability. Under-voltage and an over-voltage protection protects against bad input conditions and OCP with auto-restart prevents major load damage and restores normal operation. In addition, it includes a slew control loop to reduce output voltage undershoot and to minimize switching noise, as well as thermally-enhanced packaging for maximum heat dissipation in high-density applications.

The LTC1504ACS8#PBF is suitable for a variety of applications such as networking modules, point-of-load (POL) supplies, DSPs and ASICs, microprocessors and FPGAs, as well as industrial systems, datacom and telecom supplies, instrumentation, and consumer systems.

The working principle of the LTC1504ACS8#PBF is based on the traditional buck regulator topology. In this topology, the power switch is used to regulate the output voltage by changing the duty cycle of the inductor current. The maximum duty cycle is limited to prevent the switch from being over-driven. This is referred to as the current mode control (CMC).

The power switch is then driven by the oscillator, which is typically a sawtooth waveform. The main advantage of this topology is that the current in the power switch and inductor is sensed instead of the output voltage. This makes the LTC1504ACS8#PBF extremely robust and stable over the entire range of output voltages and operating frequencies.

The LTC1504ACS8#PBF also features a synchronous output rectifier to reduce power dissipation losses by decreasing the output voltage spikes at the current switching transitions. Additionally, programmed slope compensation and input capacitance compensation help reduce output voltage ripple. The LTC1504ACS8#PBF also supports a programmable soft-start time, which allows for smooth pre-bias startup and control of inrush currents that occur during system startup.

The LTC1504ACS8#PBF is a highly efficient and fully-protected buck converter. It is ideal for a variety of applications such as industrial, networking, communications, portable, and consumer, and the traditional buck regulator topology helps optimize performance and reduce BOM cost. Its under-voltage, over-voltage and over-current protections protect the load, and its slew control loop reduces output voltage undershoot and minimizes switching noise.

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