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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsA buck-boost converter can raise or lower voltage, but the name describes two importantly different circuits. An inverting buck-boost can produce either a higher- or lower-magnitude voltage with reversed polarity; a four-switch non-inverting buck-boost can regulate a positive output when its input is either below or above that output. Choose the topology before using its equations or selecting a controller.
What a buck-boost converter does
A DC-DC converter transfers energy from one DC voltage to another. A buck-boost design is used when the desired output magnitude may be above or below the input, or when the input range crosses the regulated output. The exact behavior depends on the circuit topology: the two common meanings of “buck-boost” do not have the same output polarity or design equations.
Choose the topology by output polarity and input range
| Topology | Output polarity | When it fits | Important qualification |
|---|---|---|---|
| Inverting single-inductor buck-boost | Negative relative to the input ground | A negative rail is required from a positive input, and the design’s power and component stresses are manageable. | Its duty-cycle and stress equations apply to this topology, not the four-switch stage. Operation depends on conduction mode and rectification implementation. |
| Four-switch non-inverting buck-boost | Positive | The input can be below or above the regulated positive output. | Transfer behavior near VIN ≈ VOUT depends on the controller implementation; use its operating-mode equations. |
The inverting circuit stores energy in its inductor while the switch is on, then transfers energy to the output during the off-time. Its output is negative even though it can step voltage magnitude up or down. Texas Instruments notes that both the inverting buck-boost and Ćuk topologies can generate a negative output from a positive input in its March 2023 power-supply design brief.
The four-switch design combines buck and boost switching legs to retain positive output polarity across an input range that spans the output. Controllers differ in how they manage the transition around VIN ≈ VOUT: TI describes approaches that keep both stages active or alternate their switching. Consult the chosen controller’s data sheet and application guidance rather than assuming one universal transfer behavior.
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Calculate the inverting buck-boost duty cycle
For an ideal inverting buck-boost in continuous conduction mode (CCM), inductor volt-second balance gives:
VOUT / VIN = −D / (1 − D)
Here, D is the switch duty cycle, VIN is positive, and VOUT is negative relative to the input ground. Rearranging in terms of output magnitude:
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D = |VOUT| / (VIN + |VOUT|)
This is an ideal CCM relationship, not a complete component-sizing formula. For an asynchronous diode implementation, TI gives a CCM duty-cycle expression that accounts for diode forward voltage Vf:
D = (−VOUT + Vf) / (−VOUT + Vf + VIN)
Switch and inductor voltage drops, controller limits, current-control behavior, and the actual operating mode also affect a practical design. For a four-switch stage, use equations that match the selected controller and its assumptions. TI’s four-switch power-stage calculations cover inductor selection, maximum switch current, duty cycle, and output-voltage setting for a specified integrated-switch CCM case; those equations should not be transferred uncritically to another IC or operating mode.
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- Synchronous rectification technology: Synchronous rectification uses a dedicated power MOSFET with very low on-resistance to replace the rectifier diode to reduce rectification losses. It can greatly improve the efficiency of DC / DC converters. The synchronous rectification technology is to greatly reduce the rectification loss at the output end of the switching power supply, thereby improving the conversion efficiency and reducing the heating of the power supply itself.
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First-pass design procedure
- Write down the operating envelope. Specify VIN(min) and VIN(max), VOUT, the full load-current range, ripple and transient targets, switching frequency, efficiency and thermal goals, and whether galvanic isolation is required.
- Select topology and confirm controller fit. Establish the required output polarity and whether VIN spans VOUT. Check the controller’s supported voltage and power range, startup and shutdown behavior, and operating modes.
- Calculate the operating corners. Determine duty cycle at the input extremes. Calculate inductor average and ripple current, then find peak current at the worst input/load corner. Do not size an inverting design from output current alone: switch and inductor current can differ substantially from it.
- Rate the power-stage parts. Check switch and rectifier voltage and current ratings, including the inverting arrangement’s worst-case stress associated with input plus output voltage. Verify inductor saturation current and winding loss. Select input and output capacitors for effective capacitance under DC bias, ripple current, voltage rating, and transient needs.
- Check control and implementation. Evaluate loop stability and transient response, then validate layout, thermal performance, startup, load steps, and conducted and radiated noise in the actual design.
These checks are not a substitute for the selected controller’s data-sheet limits or a complete design review. A topology-level equation alone cannot establish that a circuit will meet its electrical, thermal, or emissions targets.
Account for loop stability and light-load operation
The inverting buck-boost has a right-half-plane zero (RHPZ), which limits achievable closed-loop bandwidth. Analog Devices recommends setting bandwidth to about 25% to 33% of the RHPZ frequency in its design procedure. Because the RHPZ location changes with operating conditions, determine it at the relevant worst-case line/load corner and follow the selected controller’s compensation guidance. See Analog Devices’ AN-2579 design procedure.
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A diode rectifier is comparatively simple, but its forward-voltage drop dissipates power. Synchronous rectification can reduce rectification loss, while adding timing, gate-drive, and controller-compatibility requirements. Light-load behavior also matters: a diode implementation may enter discontinuous conduction mode (DCM). Analog Devices’ ADP2300/ADP2301 application note warns that its device implementation can enter DCM and does not present a full-range design that operates exclusively in DCM.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare real designs on the same basis
Neither topology is universally more efficient, smaller, or easier to implement. A meaningful comparison needs the same input range, output, load profile, and design targets. Evaluate:
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- Required output polarity and whether the input range crosses the output voltage.
- Input/output voltage and power range, including peak current and semiconductor voltage stress.
- Efficiency across the actual load range, including conduction and switching losses.
- Inductor and capacitor size, thermal dissipation, and achievable power density.
- Control complexity, startup and shutdown behavior, transfer-region behavior, and loop compensation.
- EMI and layout sensitivity; Analog Devices notes that an inverting topology can produce more output noise than some alternatives.
For a worked inverting-converter example, AN-2579 specifies −48 V at 2 A from a 36–72 V input. Those values and the parts selected for that example are not a general-purpose recipe; size components for the requirements and controller in your own design.
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