The TPS54231DR is a 28 V, 2 A, step-down (buck) converter with an integrated high-side n-channel MOSFET.
To improve performance during line and load transients, the device implements a constant frequency, current mode control which reduces output capacitance and simplifies external frequency compensation design. The TPS54231DR has a pre-set switching frequency of 570 kHz.
The TPS54231DR needs a minimum input voltage of 3.5 V to operate normally. The EN pin has an internal pull-up current source that can be used to adjust the input voltage under-voltage lockout (UVLO) with two external resistors. In addition, the pull-up current provides a default condition when the EN pin is floating for the device to operate. The operating current is 75 μA typically when not switching and under no load. When the device is disabled, the supply current is 1 μA typically.
The integrated 80 mΩ high-side MOSFET allows for high efficiency power supply designs with continuous output currents up to 2 A
FIXED FREQUENCY PWM CONTROL
The TPS54231DR uses a fixed frequency, peak current mode control. The internal switching frequency of the TPS54231DR is fixed at 570kHz
TPS54231DR APPLICATIONS
• Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays,Peripherals, and Battery Chargers• Industrial and Car Audio Power Supplies
• 5V, 12V and 24V Distributed Power Systems
Feature
- 3.5- to 28-V Input Voltage Range
- Adjustable Output Voltage Down to 0.8 V
- Integrated 80-mΩ High-Side MOSFET Supports up to 2 A Continuous Output Current
- High Efficiency at Light Loads with a Pulse Skipping Eco-mode?
- Fixed 570-kHz Switching Frequency
- Typical 1-μA Shutdown Quiescent Current
- Adjustable Slow-Start Limits Inrush Currents
- Programmable UVLO Threshold
- Overvoltage Transient Protection
- Cycle-by-Cycle Current Limit, Frequency Fold Back and Thermal Shutdown Protection
- Available in Easy-to-Use SOIC8 Package
- Supported by WEBENCH? Software Tool (www.TI.com/WEBENCH)
- APPLICATIONS
- Consumer Applications such as Set-Top Boxes, CPE Equipment, LCD Displays, Peripherals, and Battery Chargers
- Industrial and Car Audio Power Supplies
- 5-V, 12-V and 24-V Distributed Power Systems
WEBENCH Is a trademark of Texas Instruments.All other trademarks are the property of their respective owners
DescriptionThe TPS54231 device is a 2-V, 2-A non-synchronous buck converter that integrates a low RDS(on)high-side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode? feature is automatically activated. Furthermore, the 1-μA shutdown supply current allows the device to be used in battery powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current limit scheme, frequency fold back and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54231 device is available in an 8-pin SOIC package that has been internally optimized to improve thermal performance.
