TPS65276VRHHR

TPS65276V is a monolithic dual synchronous buck converter with a wide input voltage range of 4.5V to 18V, covering most power buses or batteries with intermediate bus voltages of 5V, 9V, 12V, or 15V. This converter uses constant-frequency peak current mode control, designed to simplify its application while enabling designers to optimize their approach for target applications. Each buck converter features external feedback resistors for setting the initial startup voltage, with a feedback voltage reference of 0.6V. Once the VID DAC is updated via I2C, the buck converter switches the feedback resistors from external to internal. The output voltage of each buck converter can be set in the range of 0.68V to 1.95V using an I2C-controlled 7-bit VID (in 10mV steps). Each buck converter supports I2C-controlled enable/disable of output voltage, pulse skip mode configuration, and readback of power-good status and die temperature alerts. The switching frequency of the converter can be set between 200kHz and 1.6MHz using a single external resistor. The 2 converters operate with 180° phase-shifted clock signals. The TPS65276V features dedicated enable pins for use when the I2C interface is unavailable. Independent soft-start pins provide flexibility in power-up programmability. Constant-frequency peak current mode control simplifies compensation and delivers fast transient response. Cycle-by-cycle overcurrent protection and discontinuous mode operation limit MOSFET power dissipation under short-circuit or overload fault conditions. Low-side reverse overcurrent protection prevents excessive sink current from damaging the converter. The TPS65276V also features a light-load pulse skip mode (PSM), which can be controlled via I2C or MODE pin configuration. PSM reduces power dissipation on the system input supply for high efficiency at light loads. The TPS65276V is available in a 32-pin thermally enhanced HTSSOP (DAP) package and a 36-pin QFN 6mm × 6mm (RHH) package.

Applications

• Digital Television (DTV)
• Timing Controller (TCON)
• Blu-ray Player (BDVD)
• Set-Top Box
• Tablet PC

Key features

• Wide input voltage range: 4.5V to 18V
• I2C-controlled 7-bit VID programmable output voltage range of 0.68V to 1.95V with 10mV steps for each buck converter; output voltage can also be set by resistor divider
• Programmable slew rate control for output voltage transitions
• Maximum continuous output current up to 6A for Buck Converter 1 and 3.5A for Buck Converter 2
• I2C-compatible interface supporting Standard Mode (100kHz) and Fast Mode (400kHz)
• I2C readback of power good status and die temperature alarm
• Pulse skip mode for high efficiency at light loads
• Adjustable switching frequency: 200kHz–1.6MHz set by external resistor
• Dedicated enable and soft-start for each buck converter
• Peak current mode control with simple compensation network
• Cycle-by-cycle overcurrent protection
• 180° phase-shifted operation to reduce input capacitance and supply-induced noise
• Overheat protection
• Available in 32-pin thermally enhanced HTSSOP (DAP) and 36-pin QFN 6mm × 6mm (RHH) packages