Overview
The TPS54340BDDA from Texas Instruments is a 42 V input, 3.5 A step-down DC/DC converter with an integrated high-side MOSFET. This device is designed to provide high efficiency and robust protection features, making it suitable for various industrial, automotive, and communications power systems. It operates in current mode control, which simplifies external compensation and allows for flexible component selection. The TPS54340BDDA also features a low ripple pulse skip mode to reduce no-load supply current and an internal soft-start circuit to control the output rise time during start-up, eliminating overshoot and reducing in-rush current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 V to 42 V (45 V Abs Max) | V |
| Continuous Output Current | 3.5 A | A |
| Minimum Peak Inductor Current | 4.5 A | A |
| High-Side MOSFET Resistance | 92 mΩ | mΩ |
| Operating Quiescent Current | 146 μA | μA |
| Shutdown Current | 2 μA | μA |
| Switching Frequency Range | 100 kHz to 2.5 MHz | kHz to MHz |
| Internal Voltage Reference | 0.8 V ± 1% | V |
| Junction Temperature Range | –40°C to 150°C | °C |
| Package Type | 8-Pin HSOIC with PowerPAD™ |
Key Features
- Current mode control DC/DC converter for simple external compensation and flexible component selection.
- High efficiency at light loads with pulse skipping Eco-mode™.
- Low dropout at light loads with integrated BOOT recharge FET.
- Internal soft-start circuit to control output rise time during start-up and eliminate overshoot.
- Accurate cycle-by-cycle current limit and thermal, overvoltage, and frequency foldback protection.
- Adjustable undervoltage lockout (UVLO) voltage and hysteresis.
- Synchronizes to an external clock signal.
- Integrated bootstrap recharge diode to reduce external component count.
- Overvoltage transient protection (OVP) comparator to minimize output overvoltage transients.
Applications
The TPS54340BDDA is suitable for a variety of applications, including:
- 12 V and 24 V industrial power systems.
- Automotive power systems, capable of surviving load dump pulses up to 45 V per ISO 7637.
- Communications power systems requiring high efficiency and robust protection features.
Q & A
- What is the input voltage range of the TPS54340BDDA?
The input voltage range is from 4.5 V to 42 V, with an absolute maximum of 45 V.
- What is the continuous output current of the TPS54340BDDA?
The continuous output current is 3.5 A, with a minimum peak inductor current of 4.5 A.
- What is the resistance of the high-side MOSFET in the TPS54340BDDA?
The high-side MOSFET has a resistance of 92 mΩ.
- How does the TPS54340BDDA manage no-load supply current?
The device operates in a low ripple pulse skip mode, reducing the no-load supply current to 146 μA.
- What is the shutdown current of the TPS54340BDDA?
The shutdown current is 2 μA when the enable pin is pulled low.
- What is the switching frequency range of the TPS54340BDDA?
The switching frequency range is from 100 kHz to 2.5 MHz.
- Does the TPS54340BDDA have internal protection features?
Yes, it includes thermal, overvoltage, and frequency foldback protection.
- How does the TPS54340BDDA handle output overvoltage transients?
The device has an overvoltage transient protection (OVP) comparator that turns off the high-side MOSFET when the output voltage exceeds 106% of the desired output voltage.
- What is the purpose of the internal soft-start circuit in the TPS54340BDDA?
The internal soft-start circuit controls the output rise time during start-up to reduce in-rush current and eliminate output voltage overshoot.
- Can the TPS54340BDDA synchronize with an external clock signal?
Yes, the device can synchronize its switching frequency to an external clock signal using the RT/CLK pin.
