Overview
The TPS54140ADGQR is a 42-V, 1.5-A step-down (buck) regulator produced by Texas Instruments. It features an integrated high-side n-channel MOSFET and operates with a constant frequency, current-mode control. This design simplifies external frequency compensation and reduces output capacitance. The device is optimized for high efficiency and can operate over a wide switching frequency range of 100 kHz to 2.5 MHz, allowing for flexibility in component selection. It also includes an internal phase lock loop (PLL) for synchronization with an external system clock and supports pulse skipping Eco-mode™ for high efficiency at light loads.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3.5 | 42 | V | |
| Output Voltage Range | 0.8 | 39 | V | |
| Switching Frequency Range | 100 kHz | 2.5 MHz | ||
| High-Side MOSFET Resistance | 200 mΩ | |||
| Operating Quiescent Current | 116 μA | |||
| Shutdown Supply Current | 1.3 μA | |||
| Internal Voltage Reference | 0.8 V | |||
| Package Type | MSOP10, VSON-10 | |||
| Thermal Shutdown | 182 °C |
Key Features
- High Efficiency at Light Loads: Pulse skipping Eco-mode™ reduces no-load supply current to 116 μA.
- Adjustable UVLO Voltage and Hysteresis: Internally set at 2.5 V, but can be adjusted using the enable pin.
- Wide Switching Frequency Range: 100 kHz to 2.5 MHz, allowing for efficiency and component size optimization.
- Synchronization to External Clock: Internal PLL on the RT/CLK pin for synchronization with an external system clock.
- Adjustable Slow Start and Sequencing: SS/TR pin for minimizing inrush currents and providing power supply sequencing.
- UV and OV Power-Good Output: Power good comparator asserts when output voltage is outside 94% to 107% of nominal output voltage.
- Integrated High-Side MOSFET: 200 mΩ high-side MOSFET for high efficiency power supply designs.
- Low Ripple-Pulse Skip Mode: Reduces output capacitance and simplifies external frequency compensation design.
- Thermal and Overload Protection: Frequency foldback and thermal shutdown protect the device during overload conditions.
Applications
- Industrial and Commercial Low Power Systems: Suitable for 12-V and 24-V systems.
- Aftermarket Auto Accessories: Video, GPS, and entertainment systems.
Q & A
- What is the input voltage range of the TPS54140ADGQR?
The input voltage range is from 3.5 V to 42 V.
- What is the maximum output current of the TPS54140ADGQR?
The maximum output current is 1.5 A.
- What is the switching frequency range of the TPS54140ADGQR?
The switching frequency range is from 100 kHz to 2.5 MHz.
- How does the TPS54140ADGQR achieve high efficiency at light loads?
It uses a pulse skipping Eco-mode™ that reduces the no-load supply current to 116 μA.
- What is the purpose of the SS/TR pin in the TPS54140ADGQR?
The SS/TR pin is used for slow start and tracking, minimizing inrush currents and providing power supply sequencing.
- How does the TPS54140ADGQR protect against thermal and overload conditions?
It features frequency foldback and thermal shutdown to protect the device during overload conditions.
- What is the internal voltage reference of the TPS54140ADGQR?
The internal voltage reference is 0.8 V.
- Can the TPS54140ADGQR be synchronized with an external clock?
Yes, it can be synchronized using the internal PLL on the RT/CLK pin.
- What is the shutdown supply current of the TPS54140ADGQR?
The shutdown supply current is 1.3 μA.
- What are the package options for the TPS54140ADGQR?
The device is available in MSOP10 and VSON-10 packages with PowerPAD™.
