TPS51218DSCR

The TPS51218 is a small-sized single buck controller with adaptive on-time D-CAP™mode. The device is suitable for low output voltage, high current, PC system power rail and similar point-of-load (POL) power supply in digital consumer products. A small package with minimal pin-count saves space on the PCB, while a dedicated EN pin and pre-set frequency selections minimize design effort required for new designs. The skip-mode at light load condition, strong gate drivers and low-side FET R_DS(on) current sensing supports low-loss and high efficiency, over a broad load range. The conversion input voltage which is the high-side FET drain voltage ranges from 3 V to 28 V and the output voltage ranges from 0.7 V to 2.6 V. The device requires an external 5-V supply. The TPS51218 is available in a 10-pin SON package specified from -40 ℃ to 85 ℃. The TPS51218 is a high-efficiency, single channel, synchronous buck regulator controller suitable for low output voltage point-of-load applications in notebook computers and similar digital consumer applications. The device features proprietary D-CAP™mode control combined with adaptive on-time architecture. This combination is ideal for building modern low duty ratio, ultra-fast load step response DC-DC converters. The output voltage ranges from 0.7 V to 2.6 V. The conversion input voltage range is from 3 V to 28 V. The D-CAP™mode uses the ESR of the output capacitor(s) to sense current information. An advantage of this control scheme is that it does not require an external phase compensation network, helping the designer with ease-of-use and realizing low external component count configuration. The switching frequency is selectable from four preset values using a resistor connected from the RF pin to ground. Adaptive on-time control tracks the preset switching frequency over a wide range of input and output voltages, while it increases the switching frequency at step-up of load. The RF pin also serves in selecting between auto-skip mode and forced continuous conduction mode for light load conditions. The strong gate drivers of the TPS51218 allow low RDS(on) FETs for high current applications.

Applications

• Notebook Computers
• I/O Supplies
• System Power Supplies

Key features

• Wide Input Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.7 V to 2.6 V
• Wide Output Load Range: 0 to 20A+
• Built-in ±0.5% 0.7 V Reference
• D-CAPMode with 100-ns Load Step Response
• Adaptive On Time Control Architecture With 4 Selectable Frequency Setting
• 4700 ppm/°C RDS(on) Current Sensing
• Internal 1-ms Voltage Servo Softstart
• Pre-Charged Start-up Capability
• Built in Output Discharge
• Power Good Output
• Integrated Boost Switch
• Built-in OVP/UVP/OCP
• Thermal Shutdown (Non-latch)
• SON-10 (DSC) Package