TPS51218DSCR Integrated Circuits (ICs)

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Introduction

TPS51218DSCR is a DC-DC buck converter controller designed to maintain the voltage across the load at a consistent level. The device provides excellent dynamic and static load regulation, fast current limitation, thermal protection, and no load current foldback. It is used for the power supply design of various FPGAs, DSPs, DIMMs and ASICs.

Applications

The TPS51218DSCR is suitable for use in a wide range of applications such as:

• Computers/servers
• Data communications
• Networking
• Computer peripherals
• Consumer electronics
• LCD monitors
• Cell phones
• Handheld devices

Features

• Integrated switching MOSFET
• Two-phase/dual-phase/syncable
• Input voltage range: 4.5V to 14V
• Output voltage range: 0.6V to 5.5V
• Output current up to 10A (depending on VIN and VOUT)
• Programmable VOUT levels via VID(3V,4.2V,4V,4.8V,5V,5.5V)
• Differential remote sensing (optional)
• Adjustable switching frequency up to 1MHz
• Output voltage tracking/sequencing
• Power good control via logic
• Compatible with industry standard voltage supervisors
• on-chip power-on reset (POR)
• Programmable < 0.8V UVLO feature
• Programmable soft-start time
• Programmable output current foldback
• Programmable current limit (1.3x, 1.5x, 1.7x)
• Green operation with light load currents
• Real-time temperature & current monitoring
• Small 28-pin QFN package

Working Principle

The TPS51218DSCR utilizes a two phase/dual-phase topology, consisting of two half bridges operating 180 degrees out of phase. Each half bridge includes two MOSFETs (an NMOS and a PMOS) that switch on and off at a high frequency, allowing inductors to store and release energy in order to create a regulated output voltage. The duty cycle of the MOSFETs is controlled by the on-chip PWM controller, which is responsible for setting the output voltage and monitoring current and temperature. The integrated MOSFETs are robust, allowing the device to switch up to 10 A current. The device is protected from overloads, with adjustable current limit and foldback that reduces the peak current to the inductor and load.

Conclusion

The TPS51218DSCR is a highly integrated DC-DC controller ideal for powering FPGAs, DSPs, DIMMs and ASICs. With its excellent dynamic and static load regulation, fast current limitation, and thermal protection features, it is well suited for a variety of applications including computing, data communications, networking, computer peripherals, consumer electronics, LCD monitors, cell phones and handheld devices.

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