TPS54240DGQR - 42V 2.5A Step-Down Converter | Texas Instruments
N.º de pieza: TPS54240DGQR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.66 | $16,60 |
| 100 | $1.48 | $148,00 |
| 500 | $1.32 | $660,00 |
| 1.000 | $1.18 | $1.180,00 |
| 3.000 | $1.04 | $3.120,00 |
TPS54240DGQR Descripción general
A buck (step-down) converter is a switch-mode power supply topology that uses an inductor and switching element to efficiently convert a higher DC input voltage to a lower DC output voltage. Within the power management IC hierarchy, buck converters sit beneath switching regulators and above linear regulators in efficiency and below them in noise; the TPS54240 further offers Eco-Mode pulse-skipping to raise light-load efficiency, putting it in the SWIFT family of TI converters targeting industrial, automotive, and telecom rails.
Key features include 138 µA typical operating quiescent current, 1.3 µA shutdown supply current when EN is pulled low, an internal 0.8 V reference, current-mode control with simple external compensation, and pulse-skipping Eco-Mode for high light-load efficiency. The internal high-side MOSFET is rated at 92 mΩ (typical), minimizing conduction losses at 2.5 A. Built-in protection includes UVLO, cycle-by-cycle over-current limiting, thermal shutdown, and slow-start controlled by an external SS capacitor.
Architecturally, the TPS54240 uses peak current-mode control, which provides inherent line-voltage rejection, simple single-pole compensation, and cycle-by-cycle current limiting. The 2.5 MHz switching node is paired with a low-ESR ceramic output capacitor; combined with the PowerPAD exposed thermal pad on the HVSSOP-10, the device delivers high efficiency across load while keeping the PCB footprint compact.
Typical applications include 24 V industrial sensor and PLC rails, automotive body electronics and infotainment pre-regulators, battery-powered USB-PD and portable-device chargers, multi-rail distributed power systems that need a front-end 5 V or 12 V bus, point-of-load regulation for FPGAs and DSPs, and LED driver front-ends. The wide Vin tolerance also suits solar and energy-harvesting front-end inputs.
For design, size the inductor around L = (VOUT × (VIN−VOUT))/(VIN × KS × IOUT × fSW) and verify that the saturation current is at least 30% above the peak inductor current to absorb transients and avoid hitting the cycle-by-cycle current limit. The exposed PowerPAD must be soldered to a continuous ground copper pour of at least 1 in² to achieve the rated thermal resistance of approximately 40 °C/W.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives in the HVSSOP-10 footprint, comparison data versus close TI family members, and practical design notes not found in the bare datasheet.
Alternativas directas para TPS54240DGQR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TPS54260DGQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS54160DGQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS54060ADGQR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS54240QDGQRQ1
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
TPS54240DGQR Valores máximos y características eléctricas
| Topología | Buck (Step-Down) |
| Rango de tensión de entrada | 3.5 V to 42 V |
| Rango de tensión de salida | 0.8 V to ~39 V (adjustable) |
| Continuous Output Current | 2.5 A |
| Frecuencia de conmutación | 2.5 MHz (nominal) |
| High-Side MOSFET Rds(on) | 92 mΩ (typical) |
| Quiescent Current (operating) | 138 µA (typical) |
| Shutdown Supply Current | 1.3 µA (typical, EN low) |
| Internal Reference Voltage | 0.8 V |
| Control Mode | Peak Current-Mode |
| Light-Load Mode | Eco-Mode (pulse-skip) |
| Rango de temperatura de funcionamiento | -40 °C to +150 °C (TJ) |
| Encapsulado | 10-Pin HVSSOP (PowerPAD MSOP), 3.0 mm width |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (TI product family) |
| AEC-Q100 Automotive Grade | Not standard - check TPS54240-Q1 variant for automotive |
| Protection Features | UVLO, Cycle-by-cycle OCP, Thermal Shutdown, Slow-Start |
Configuración de pines de TPS54240DGQR
| Pin 1 | BOOT — Bootstrap capacitor for high-side gate drive |
| Pin 2 | VIN — Input supply voltage (3.5 V to 42 V) |
| Pin 3 | EN — Enable pin, active high, internal pull-up |
| Pin 4 | RT/SS — Frequency set resistor and soft-start capacitor node |
| Pin 5 | FB — Feedback input (0.8 V internal reference) |
| Pin 6 | COMP — Compensation network node for current-mode loop |
| Pin 7 | GND — Analog ground |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | SW — Switching node connection (parallel with pin 10) |
| Pin 10 | SW — Switching node connection (parallel with pin 9) |
| Pin 11 | DAP/PGND — Exposed thermal pad - must be soldered to PCB ground pour |
Aplicaciones típicas
TPS54240DGQR es adecuado para 6 aplicacións: 24 V Industrial Sensor and PLC Rails, Automotive Body Electronics Pre-Regulator, USB-PD and Battery Charger Front-End, FPGA/DSP Point-of-Load Regulator, Telecom and Datacom Auxiliary 5 V Rails, LED Driver / Lighting Front-End.
24 V Industrial Sensor and PLC Rails
The TPS54240DGQR's 3.5 V to 42 V input window and 2.5 A output rating fit 24 V industrial rails that power sensors, PLCs, and field instrumentation where power conditioning is required down to 5 V, 3.3 V, or 1.8 V. The 92 mΩ internal high-side MOSFET delivers 88-92% efficiency at typical 24 V to 5 V conversion, while the wide Vin tolerance absorbs transient over-voltages common on industrial backplanes. In a typical design, an external 2.2 µH inductor and 22 µF X7R output cap keep the converter footprint under 100 mm²; Eco-Mode enables the part to retain 80%+ efficiency even at 10 mA loads, important for remote sensor nodes that idle most of the time.
Recomendado
Automotive Body Electronics Pre-Regulator
Use the TPS54240DGQR (or its Q1 automotive-grade equivalent TPS54240QDGQRQ1) as a front-end buck for body-control modules that must hold up against 12 V cranking and load-dump transients up to ~40 V on the input rail. The part's 42 V absolute-maximum rating and internal UVLO handle 24 V jump-start events in 12 V vehicles, and the 2.5 A current capacity feeds downstream 5 V or 3.3 V LDOs and CAN transceivers. The 2.5 MHz switching node enables small ceramic output capacitors, and the exposed PowerPAD copper pour dissipates continuous 5 W losses without an external heatsink in sealed enclosures.
Recomendado
USB-PD and Battery Charger Front-End
Place the TPS54240DGQR between a 12 V or 24 V supply and the USB-PD controller's input to provide a clean, isolated rail for downstream USB Type-C negotiation, or use it as a pre-regulator for a battery management IC. The 2.5 A continuous output supports 5 V at 2.5 A (12.5 W), and the Eco-Mode pulse-skip keeps standby power in the 100 µA range when no device is connected to the USB-C port. The wide 3.5 V to 42 V input window means one converter design supports both 12 V solar trickle-charge systems and 24 V industrial battery packs.
Recomendado
FPGA/DSP Point-of-Load Regulator
Use the TPS54240DGQR as a 5 V or 3.3 V point-of-load converter feeding an FPGA core, DSP, or microcontroller from a 12 V or 24 V backplane. At 2.5 MHz the converter responds quickly to transient load steps (down to 1-3 µs) demanded by FPGA logic-state changes; with a 22 µF ceramic output capacitor and an external 4.7 µF input bulk capacitor, the design keeps core-rail droop under 50 mV during 1 A load steps. The exposed PowerPAD is sufficient to dissipate 2-3 W continuous losses on a 6-layer PCB with 1 oz copper, eliminating an external heatsink in compact SoM designs.
Recomendado
Telecom and Datacom Auxiliary 5 V Rails
In telecom and datacom systems, the TPS54240DGQR sits on each pluggable module or line card and regulates from the 24 V, 36 V, or 48 V backplane down to a 5 V or 3.3 V rail for ancillary logic. The 42 V max VIN matches 48 V backplanes derated under fault, and the 88%+ efficiency at 36 V to 5 V conversion produces less waste heat in densely packed chassis. The HVSSOP-10 footprint uses only 9 mm² of board area, freeing space for magnetics layout and routing high-speed data lines.
Recomendado
LED Driver / Lighting Front-End
Use the TPS54240DGQR as a constant-voltage front-end to feed a downstream current-mode LED driver, or operate it directly from 12-24 V LED strips to step down to 5 V status-logic rails. The 2.5 A capacity can drive 5 V LED-pixel arrays (WS2812, APA102) up to several hundred pixels; the wide input tolerates industrial and architectural lighting-supply voltages without a separate pre-regulator stage. The 1.3 µA shutdown current (EN low) enables simple on/off switching for daylight sensor inputs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TPS54240DGQR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TPS54260DGQR | TPS54160DGQR | TPS54060ADGQR | TPS54240QDGQRQ1 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-pin HVSSOP (PowerPAD MSOP) | 10-pin HVSSOP (PowerPAD MSOP) - same | 10-pin HVSSOP (PowerPAD MSOP) - same | 10-pin HVSSOP (PowerPAD MSOP) - same | 10-pin HVSSOP (PowerPAD MSOP) - same |
| Input Voltage Range | 3.5 V to 42 V | 3.5 V to 42 V - same | 3.5 V to 42 V - same | 3.5 V to 60 V - wider | 3.5 V to 42 V - same |
| Continuous Output Current | 2.5 A | 3.0 A - 20% higher | 1.5 A - 40% lower | 0.5 A - lower | 2.5 A - same |
| Switching Frequency | 2.5 MHz nominal | 2.5 MHz nominal - same | 500 kHz to 2.5 MHz - similar | 1.2 MHz - different | 2.5 MHz nominal - same |
| AEC-Q100 Automotive Grade | Not qualified | Not standard (Q1 variant available) | Not standard (Q1 variant available) | Not standard | Yes - AEC-Q100 Grade 1 |
Diferenciadores clave
- Highest output current in SWIFT family at HVSSOP-10 (frente a TPS54160DGQR)
- Wide 42 V max input matches industrial/automotive transients (frente a TPS54302 (SOT-23-6))
- Eco-Mode enables >80% efficiency at 10-100 mA loads (frente a TPS54060ADGQR)
Notas de diseño
Estimated: at VIN = 24 V, VOUT = 5 V, and 2 A continuous load, the TPS54240DGQR dissipates approximately (24 V - 5 V) × 2 A = 38 W × 83%× 2 W of switching+conduction loss (≈ 6-8 W total loss budget). The HVSSOP-10 PowerPAD has θJA ≈ 40 °C/W on a 1 oz copper 6-layer board with 1 in² copper pour; above 3 W dissipation the PowerPAD copper area should grow to 1.5-2 in² to keep Tj below 125 °C in 70 °C ambient. Without the PowerPAD soldered, θJA rises to over 150 °C/W and the part overheats within a few seconds at 2.5 A load.
Place the boot capacitor (CBOOT, typically 0.1 µF) within 5 mm of the BOOT and SW pins, and use a wide, short trace for the SW node to minimize ringing. Keep the input capacitor return path close to the GND/PowerPAD to keep input ripple under 30 mV at 2.5 A. Route FB traces away from the switching node to avoid injected noise pickup, and keep the COMP network separated from switching signals. Datasheet layouts typically show a ground copper pour directly under the chip with vias tying it to bottom-layer ground.
Do not exceed 42 V on VIN, even for microseconds - transient clamp or TVS may be needed if the system is exposed to load-dump or hot-plug events above 42 V. The FB resistor divider should use 1% or better tolerance to maintain VOUT accuracy; substituting generic 5% resistors can shift the regulated voltage by several percent. The RT/SS pin serves dual purpose: it sets the switching frequency and discharges during slow-start; using a single RT resistor and a separate SS capacitor is mandatory.
Two-layer PCBs are possible but difficult - prefer a 4-layer board with a dedicated ground plane to achieve the rated efficiency. The PowerPAD exposed pad must be soldered using a 4×4 thermal via array (0.3 mm drill, 1 mm pitch) tying the pad to inner ground planes. Place input bypass capacitors (1 µF X7R + 10 µF electrolytic or ceramic) as close as possible to the VIN pin to suppress switching noise that can interfere with VIN sensing.
Información de cumplimiento
RoHS and REACH compliant per TI product page and ordering documentation. TPS54240 (catalog) is NOT AEC-Q100 qualified - use the Q1 suffix variant for automotive. Lead-free and halogen-free per TI packaging materials specifications; conflict-minerals statement available on TI.com/supplier-responsibility.
