Catalog
17V Input, 5A Synchronous Step-Down Converter
Key Features
• Integrated 57mΩ / 50mΩ MOSFETsSplit Power Rail: 1.6V to 17V on PVIN200kHz to 900kHz Switching FrequencySynchronizes to External Clock0.8V Voltage ReferenceLow 2µA Shutdown Quiescent CurrentHiccup Overcurrent ProtectionMonotonic Start-Up into Prebiased Outputs–40°C to 125°COperating Junction Temperature RangePin-to-Pin Compatible with the TPS54620Adjustable Slow Start/Power SequencingPower Good Output for Undervoltage andOvervoltage MonitoringAdjustable Input Undervoltage LockoutSupported by SwitcherPro Software ToolAPPLICATIONSFlat Panel Digital TVsSet Top Boxes, Personal Video RecordersNet BooksHigh Density 3.3V/5V Power Distributionfrom 12 V BusIntegrated 57mΩ / 50mΩ MOSFETsSplit Power Rail: 1.6V to 17V on PVIN200kHz to 900kHz Switching FrequencySynchronizes to External Clock0.8V Voltage ReferenceLow 2µA Shutdown Quiescent CurrentHiccup Overcurrent ProtectionMonotonic Start-Up into Prebiased Outputs–40°C to 125°COperating Junction Temperature RangePin-to-Pin Compatible with the TPS54620Adjustable Slow Start/Power SequencingPower Good Output for Undervoltage andOvervoltage MonitoringAdjustable Input Undervoltage LockoutSupported by SwitcherPro Software ToolAPPLICATIONSFlat Panel Digital TVsSet Top Boxes, Personal Video RecordersNet BooksHigh Density 3.3V/5V Power Distributionfrom 12 V Bus
Description
AI
The TPS54521 is a full featured 17V, 5A synchronous step down converter which is optimized for small designs through high efficiency and integrated high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor’s footprint.
The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.
Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54521 is available in a 14 pin, 3.5mm × 3.5mm QFN, thermally enhanced package.
The TPS54521 is a full featured 17V, 5A synchronous step down converter which is optimized for small designs through high efficiency and integrated high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor’s footprint.
The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.
Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54521 is available in a 14 pin, 3.5mm × 3.5mm QFN, thermally enhanced package.
