MP2949 - 3-28V Sync Buck Controller | Monolithic Power Systems
N.º de pieza: MP2949 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.65 | $16,50 |
| 100 | $1.42 | $142,00 |
| 500 | $1.2 | $600,00 |
| 1.000 | $1.05 | $1.050,00 |
MP2949 Descripción general
A hysteretic control architecture is a type of switching regulator topology that uses output voltage ripple directly to trigger switching events, eliminating the need for an internal error amplifier compensation network. This results in inherently stable operation across a broad range of output LC filter combinations, very fast transient response, and simple external component selection. Hysteretic controllers trade a variable switching frequency for these benefits and are often paired with adaptive ontime variants in modern designs.
Key features include programmable valley current limiting for robust overload protection, a wide 0.6V to 5V adjustable output range using an external resistor divider, internal 5V LDO for gate drive supply, and an external soft-start pin for controlled startup into large output capacitors. The exposed-pad QFN package provides a low thermal resistance path, allowing continuous operation at high load currents when properly soldered to PCB ground copper. The hysteretic control eliminates compensation network complexity, simplifying the design-in process.
Typical applications include telecom base station point-of-load regulation, FPGA and ASIC core voltage generation, industrial 24V bus intermediate stages, networking switch/router power rails, and high-current DC-DC bricks for server motherboards. The 28V input tolerance also tolerates transient spikes on 24V industrial buses without additional protection circuitry.
When designing with the MP2949, place the boot capacitor, bootstrap diode, and high-side MOSFET gate connection on the same PCB layer with minimal loop area to limit switching node ringing. Select the inductor ripple current at 20-40% of full load to balance transient response and conduction losses. Ensure the SNSN and SNSP current-sense traces are routed as a differential pair to reject switching node noise.
Alternativas directas para MP2949 — 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:
MP2905
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MP2949A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MP2949 Valores máximos y características eléctricas
| Topología | Synchronous Step-Down (Buck) Controller |
| Control Method | Hysteretic |
| Rango de tensión de entrada | 3 V to 28 V |
| Rango de tensión de salida | 0.6 V to 5 V (adjustable) |
| Output Current | External MOSFET dependent |
| Frecuencia de conmutación | Variable (hysteretic) |
| Current Sensing | Valley current sense (RDS(ON) or external sense resistor) |
| Internal LDO | 5 V (gate drive supply) |
| Arranque suave | External soft-start capacitor |
| Encapsulado | QFN (exposed pad, surface mount) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| High-Side Drive | Internal bootstrap with external diode |
Guía de configuración de pines de MP2949 qfn (exposed pad, surface mount)
Configuración de pines para MP2949 (encapsulado qfn (exposed pad, surface mount)). Este dispositivo de potencia presenta terminales de puerta, drenador y fuente. Para encapsulados no polarizados, consulte la hoja de datos del fabricante para conocer la orientación exacta del pin 1 y los detalles del footprint. Las aplicaciones habituales incluyen el diseño de fuentes de alimentación, el accionamiento de motores y la conmutación de cargas.
No hay datos detallados de patillaje disponibles para MP2949.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
MP2949 es adecuado para 6 aplicacións: Telecom Base Station Point-of-Load, FPGA and ASIC Core Voltage Generation, Industrial 24V Bus Intermediate Stage, Networking Switch and Router Power Rails, High-Current Server Motherboard VR, Battery-Powered Portable Equipment.
Telecom Base Station Point-of-Load
Provides high-current 1.8V to 3.3V rails for telecom base station digital signal processors and FPGAs from a 12V or 24V intermediate bus. The MP2949's 3V-28V input range tolerates the wide voltage swings and transient spikes on telecom distribution buses, while its hysteretic control delivers sub-microsecond transient recovery when baseband DSPs switch between active and idle states. Placed after an isolated 48V-to-12V brick, with external 30V MOSFETs to handle continuous 10-15A loads, this solution achieves high efficiency without the compensation network complexity of traditional PWM controllers.
Recomendado
FPGA and ASIC Core Voltage Generation
Generates the low-voltage, high-current core rails (0.85V to 1.2V) required by modern FPGAs and ASICs from a 5V or 12V input. The MP2949's hysteretic control provides the fast transient response required when FPGAs instantaneously switch millions of logic gates, while the 0.6V reference supports the latest low-voltage process nodes. Designed with external DrMOS or discrete FET pairs, the controller delivers 20-30A continuous current with the exposed thermal pad QFN package, requiring minimum PCB copper area of one square inch.
Recomendado
Industrial 24V Bus Intermediate Stage
Steps down a 24V industrial bus to intermediate voltages (5V, 3.3V, 1.8V) for PLCs, motor controllers, and industrial sensor modules. The MP2949's 28V maximum input rating tolerates the overvoltage transients common on industrial 24V distribution lines, while its wide operating temperature range supports harsh factory environments. The exposed-pad QFN package allows convection-cooled operation up to 5-8A continuous when properly attached to PCB ground copper.
Recomendado
Networking Switch and Router Power Rails
Powers the packet processor, PHY, and switching ASIC rails in enterprise networking switches and routers from a 12V backplane supply. The MP2949's fast hysteretic transient response handles the bursty current demands of multi-gigabit packet processing, while its small QFN footprint enables high-density PoL design under the switch ASIC. External MOSFETs sized for 15-25A continuous current support fully loaded 48-port gigabit switch designs.
Recomendado
High-Current Server Motherboard VR
Provides intermediate voltage rails (1.0V, 1.8V, 3.3V) for server motherboards from a 12V distribution plane, complementing the main multi-phase CPU VR. The MP2949's external-MOSFET architecture allows designers to size the synchronous FETs for 30A+ continuous current while benefiting from the simplicity of hysteretic control. Pairs well with the MP2949A as the primary CPU VR controller when both controllers are present on the same server board.
Recomendado
Battery-Powered Portable Equipment
Steps down lithium-ion battery voltage (3.0V-4.2V nominal) to 3.3V or 1.8V rails for portable industrial and medical handheld equipment. The MP2949's low 3V minimum input accommodates deeply discharged battery conditions, while its hysteretic control provides excellent light-load efficiency for battery standby. External MOSFETs can be selected for low RDS(ON) to maximize battery runtime at moderate continuous loads.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MP2949 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MP2905 | MP2949A |
|---|---|---|---|
| Brand | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Package | QFN (exposed pad) | QFN (exposed pad) - same family | TQFN-48 |
| Topology | Synchronous Buck Controller (Hysteretic) | Synchronous Buck Controller (Hysteretic) | Triple-Rail Digital Multi-Phase Controller |
| Output Voltage Range | 0.6 V to 5 V | 0.6 V to 5 V | Multi-rail IMVP8/IMVP9 compliance |
| Number of Outputs | 1 (single rail) | 1 (single rail) | 3 rails, up to 6 phases total |
| Control Interface | Analog (FB + COMP) | Analog (FB + COMP) | PMBus (digital) |
| Target Application | General-purpose POL | General-purpose POL | Intel IMVP8/IMVP9 CPU/ASIC VR |
Diferenciadores clave
- Hysteretic control eliminates external compensation network (frente a MP2949A)
- Single-rail simplicity vs multi-phase digital complexity (frente a MP2949A)
- Same-brand family member with proven hysteretic topology (frente a MP2905)
Notas de diseño
Estimated: at 12V input, 1.8V output, 15A continuous load, power dissipation in the synchronous FETs is dominated by I^2RDS(ON) + switching losses, typically 3-5W total. The exposed thermal pad of the MP2949 QFN package must be soldered to a PCB ground copper pour of at least one square inch to maintain junction temperature within safe operating limits. Route the high-current switching node (SW) and bootstrap traces on the top layer with minimum loop area to limit parasitic inductance and ringing.
Place the bootstrap capacitor and external bootstrap diode as close as possible to the BST and SW pins of the MP2949 to minimize the high-side gate drive loop. Route the SNSN and SNSP current-sense traces as a tightly-coupled differential pair to reject switching node noise that would otherwise cause premature current-limit tripping. Keep the feedback (FB) trace away from the SW node and use a small ground pour around the analog ground reference.
Do not exceed the 28V absolute maximum input voltage on VIN - add a transient voltage suppressor for hot-plug or inductive load events on the input bus. Ensure the soft-start capacitor value is sized correctly to limit inrush into large output capacitor banks; too small a value triggers fault conditions, too large a value slows startup unacceptably. Verify the inductor saturation current rating exceeds the valley current limit threshold with margin to avoid saturation during transients.
Información de cumplimiento
RoHS and lead-free compliance inferred from MPS standard manufacturing practices and QFN package marking conventions; confirm exact halogen-free status from the MP2949 datasheet. AEC-Q100 not applicable - this is a general-purpose industrial controller.
