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What does a DC/DC converter do?
A DC/DC converter takes a direct-current (DC) supply and produces a controlled DC output at a different voltage. Its regulator monitors the output and adjusts switching to keep the rail near its target as the input or load changes.
A switching regulator transfers energy through electronic switches and reactive components such as inductors and capacitors. Switching enables efficient voltage conversion, but also creates ripple and makes circuit layout, electromagnetic interference (EMI), and transient response important design considerations.
A low-dropout (LDO) regulator is a linear alternative that may be appropriate when simplicity or noise behavior matters more than conversion efficiency. It dissipates power as heat when dropping voltage; as the input-to-output voltage difference grows, the efficiency advantage of a buck converter over a linear/LDO regulator grows, according to Texas Instruments’ March 2023 topology brief. Read the brief.
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What is the difference between buck, boost, and buck-boost?
The topology describes how the circuit changes voltage. It also affects current flow and the demands on filtering and layout.
| Topology | What it does | Useful when | Current behavior described by TI |
|---|---|---|---|
| Buck | Steps input voltage down to a lower output voltage. | The source is above the required rail across operating conditions. | Input current is pulsed; the output inductor-capacitor filter supports continuous output current. Input ripple is larger than output ripple in the described topology. |
| Boost | Steps input voltage up to a higher output voltage. | The source is below the required rail across operating conditions. | The described implementation has continuous input current and pulsed output current. |
| Buck-boost | Regulates an output when the input can be either below or above the target. | The input range crosses the required output, such as when a battery voltage varies during use. | Behavior depends on the chosen implementation and operating mode. |
These descriptions and current-flow distinctions are from Texas Instruments’ March 2023 topology brief. A topology name alone does not establish the current rating, efficiency, ripple, or suitability of a particular circuit.
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Converter IC or controller IC: what is the difference?
Both types are used to regulate power. The difference is mainly what the IC integrates and what must be added to form the power stage.
| IC type | What is typically integrated | What the designer adds | Main trade-off |
|---|---|---|---|
| DC/DC converter IC | Controller and one or more power FETs (field-effect transistors). | Typically an external inductor and supporting components. | Usually fewer external parts and a more compact implementation. |
| DC/DC controller IC | Control circuitry that drives an external power stage. | External MOSFETs or power-stage components, magnetic components, capacitors, and supporting circuitry. | More flexibility in selecting power devices and managing power or heat, with greater design and layout responsibility. |
Texas Instruments distinguishes its DC/DC converter and DC/DC controller categories on this basis. An external-FET controller is not a complete power supply by itself: the selected FETs, inductor, capacitors, board layout, and path for removing heat all affect the finished circuit. Integrated FETs can reduce component count, while an external power stage can offer more selection flexibility; its larger current loop and package parasitics may increase EMI and layout challenges.
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How to choose a buck converter IC or controller
Start with the electrical conditions the design must survive, not with a headline current rating. A first-pass shortlist should match the complete operating range and load, then account for efficiency, thermal limits, noise, and the practical cost of implementing the circuit.
- Define input conditions. Record nominal, minimum, and maximum voltage, as well as startup and surge conditions. Confirm the IC’s operating range and absolute maximum ratings cover them; do not treat an absolute maximum as a normal operating voltage.
- Specify the output and load. State the target output voltage, continuous and peak load current, and likely load steps. Include sequencing requirements if multiple rails must turn on in a particular order.
- Choose a topology. Use buck when the source stays above the target, boost when it stays below, and buck-boost when it can cross the target. Check the actual device’s operating modes and limits in its datasheet.
- Choose the power-stage approach. An integrated-FET converter may simplify a compact design. A controller with external FETs can provide more flexibility for power and thermal needs, but requires selecting and laying out the external stage.
- Compare performance across conditions. Review efficiency over the expected load and voltage range, thermal behavior in the intended board and enclosure, switching frequency, ripple, transient response, and EMI. A single efficiency figure or current rating cannot substitute for these checks.
- Check protection and implementation details. Verify current limits and overcurrent, overvoltage, and undervoltage behavior, alongside package, required passives, design tools, lifecycle status, and availability. Use the datasheet and reference design to validate component values and layout.
Topology recommendations are application-dependent rather than universal thresholds. For example, TI’s March 2023 brief recommends considering synchronous rectification for buck converters with small duty cycle and output current above 3 A, and a multiphase or interleaved stage above 30 A output current. Those are the brief’s guidance; the appropriate choice still depends on the operating conditions and full design.
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Examples: a buck controller and a buck-boost evaluation design
TPS51275: a dual-synchronous buck controller
Texas Instruments’ TPS51275 product page, which marked the part active when accessed in 2026, specifies a 5 V to 24 V input range and 5 V and 3.3 V outputs. It lists built-in 100 mA LDOs, adaptive on-time D-CAP control, overvoltage, undervoltage, and overcurrent protection, and a 20-pin 3 mm × 3 mm QFN package. TI describes it for notebook system-power supply solutions. These are device-specific specifications, not general expectations for buck controllers; consult the current product page and datasheet for design details.
LM51772EVM-HP: an evaluation module, not a finished product
TI describes the LM51772EVM-HP as an evaluation module for prototyping a controller-based buck-boost design, configurable for 9–48 V input, 20 V regulated output, and up to 5 A load. Those figures describe the evaluation module’s configuration, not proof that a finished product using the controller will meet the same requirements. See TI’s LM51772 product page and EVM information.
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Why the whole circuit matters
A controller-based design is a system of parts, not just an IC choice. MOSFET selection, magnetic components, capacitors, switching loops, board stack-up and layout, and the thermal path influence performance. A controller may support a broad set of designs, but its datasheet and reference designs are needed to determine whether a particular implementation will regulate correctly and meet thermal and EMI requirements.
Layout effects can be especially significant at switching edges. In one older TI technical article about a discrete-MOSFET automotive buck example, the measured switch-node ringing frequency was 215 MHz; that observation is specific to the article’s circuit and is illustrative, not a general specification. The article discusses the 174–230 MHz automotive radio range in that context. Read TI’s topology discussion.
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