A4956KLPTR-T - 50V Full-Bridge PWM Gate Driver | Allegro
N.º da peça: A4956KLPTR-T ⚠ Última compra| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.85 | $3,85 |
| 10 | $3.42 | $34,20 |
| 100 | $2.91 | $291,00 |
| 500 | $2.48 | $1.240,00 |
| 1.000 | $2.15 | $2.150,00 |
A4956KLPTR-T Visão geral
A brushed DC motor driver in this category is an integrated circuit that combines logic-level input conditioning with high-current gate drive circuitry, allowing low-power microcontrollers to control high-power motor windings through external N-channel MOSFETs. The A4956 specifically targets full-bridge (H-bridge) topologies where four external N-FETs switch bidirectional current through a single motor winding. This architecture (gate driver IC -> brushed DC motor driver -> motor driver IC -> power management IC -> semiconductor) places the A4956 between logic-level control and the high-current power stage.
Key features include adjustable dead time to prevent cross-conduction, integrated charge pump for high-side N-FET drive at 100% duty cycle, comprehensive fault protection (overcurrent, thermal shutdown, undervoltage lockout), and a low-current sleep mode for battery-powered systems. The TSSOP-EP package's exposed thermal pad directly couples driver dissipation into the PCB copper, enabling sustained high-frequency PWM operation without external heatsinking.
The A4956 uses a synchronous bootstrap architecture for high-side drive, with internal charge pump maintaining VGS above VCC for 100% duty cycle operation. Logic inputs accept 3.3 V or 5 V CMOS signals, and the internal current sense comparator enables cycle-by-cycle overcurrent protection with programmable threshold via an external resistor. Synchronous rectification capability reduces body-diode conduction losses in the external MOSFETs.
Typical applications include brushed DC motor control in automotive auxiliary systems, industrial valve and actuator drives, robotics and CNC low-power axes, battery-powered power tools, and HVAC damper actuators. The wide 5.5 V to 50 V supply range accommodates both 12 V automotive and 24 V / 36 V industrial bus rails without intermediate regulation.
When designing with this device, select external N-channel MOSFETs with VDS rating of at least 60 V (for the 50 V supply ceiling) and confirm that the bootstrap capacitor value (typically 100 nF to 1 uF) is sized for the highest PWM frequency and duty cycle in the application. Place the charge-pump and bootstrap capacitors as close as possible to their respective pins to minimize switching transients.
This page synthesizes distributor pricing, drop-in and same-package alternatives, application examples and PCB design notes for the A4956KLPTR-T that are not consolidated in the manufacturer datasheet.
Alternativas drop-in para A4956KLPTR-T — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
A4956KLPTR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
A4956KLP-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
A4956KLPTR-T Classificações máximas e características elétricas
| Motor Type | Brushed DC |
| Topologia | Full-Bridge (H-Bridge), external N-FETs |
| Supply Voltage Range | 5.5 V to 50 V |
| Configuração de saída | NMOS, Parallel interface |
| Maximum Operating Voltage | 50 V |
| Número de saídas | 4 (4 N-channel gate drivers) |
| Logic Input Compatibility | 3.3 V / 5 V TTL |
| Dead-Time Control | Adjustable (external resistor) |
| Charge Pump | Internal, for 100% duty high-side drive |
| Protection Features | Overcurrent, Thermal Shutdown, UVLO |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | 20-TSSOP-EP (exposed pad) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Automotive Qualification | AEC-Q100 (per Microchip USA listing) |
| Lifecycle Note | NOT FOR NEW DESIGN - restricted to existing customer applications |
Guia de Configuração de Pinos do A4956KLPTR-T 20-tssop-ep (exposed pad)
Configuração de pinos para A4956KLPTR-T (pacote 20-tssop-ep (exposed pad)). Este dispositivo de potência possui terminais de gate, drain e source. Para pacotes não polarizados, consulte o datasheet do fabricante para a orientação exata do pino 1 e detalhes do footprint. Aplicações comuns incluem projeto de fontes de alimentação, acionamento de motores e comutação de cargas.
Nenhum dado detalhado de pinagem disponível para A4956KLPTR-T.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
A4956KLPTR-T é adequado para 7 aplicaçãos: Automotive Brushed DC Auxiliary Motors, Industrial 24V Brushed DC Valve and Actuator Drives, Battery-Powered Power Tools and Corded Drills, Robotics and CNC Low-Power Axes, HVAC Damper and Valve Actuators, Solar Tracking and Small Pump Drives, Educational and Hobby Brushed DC Motor Kits.
Automotive Brushed DC Auxiliary Motors
The A4956KLPTR-T's 5.5 V to 50 V supply range directly supports 12 V automotive body systems (HVAC blowers, seat adjusters, mirror actuators) and 24 V / 48 V mild-hybrid auxiliary rails. Its parallel TTL interface accepts 3.3 V or 5 V PWM directly from a body-domain microcontroller without level shifters, and the integrated charge pump holds high-side gate drive at 100% duty cycle for slow, smooth seat positioning. AEC-Q100 screening (per Microchip USA listing) makes it suitable for underhood and cabin modules. Combined with cycle-by-cycle overcurrent protection that latches on stall, the A4956 protects the FETs during a frozen seat actuator, which is critical for warranty-sensitive automotive designs.
Recomendado
Industrial 24V Brushed DC Valve and Actuator Drives
The A4956KLPTR-T's 50 V supply ceiling comfortably covers 24 V industrial bus rails with substantial transient headroom, while the TSSOP-EP exposed pad couples switching dissipation directly into PCB copper for continuous-duty valve positioning in process-control panels. Adjustable dead time lets designers trade off switching losses versus cross-conduction risk when switching slow inductive loads such as solenoid valves and damper actuators. The integrated current-sense comparator enables stall detection at the end of valve travel without an external shunt amplifier. Sleep mode preserves battery backup on control panels during outages.
Recomendado
Battery-Powered Power Tools and Corded Drills
The A4956KLPTR-T's wide 5.5 V to 50 V supply range supports both 18 V / 36 V cordless tool packs and mains-rectified 48 V corded-drill rails from a single driver design, simplifying SKU consolidation for power-tool OEMs. External N-FETs let engineers size RDS(on) for the specific torque and current requirement of each tool (cordless drill vs impact driver), trading off BOM cost against thermal rise. Cycle-by-cycle overcurrent protection handles the high inrush of stalled motor lock, and the TSSOP-EP exposed pad keeps the driver IC cool during the high-duty-cycle bursts of hammer-drill operation. Sleep mode preserves battery charge during idle shelf periods.
Recomendado
Robotics and CNC Low-Power Axes
The A4956KLPTR-T drives the brushed DC servo axes commonly found in hobby-grade CNC routers, desktop pick-and-place machines, and small robotic arm joints, where the 50 V supply range covers 24 V / 36 V motion-control rails. The parallel logic interface connects directly to FPGA or MCU motion controllers without SPI overhead, allowing sub-microsecond PWM updates for smooth low-speed trajectory following. Adjustable dead time and integrated charge pump maintain clean switching at the high PWM frequencies needed for quiet servo performance. Current-sense feedback enables torque-mode control for compliant grippers and force-feedback haptic devices.
Recomendado
HVAC Damper and Valve Actuators
The A4956KLPTR-T is well-suited to commercial HVAC damper and zone-valve actuators, where the 50 V supply headroom accepts 24 V AC rectified / 48 V system rails and the TSSOP-EP package fits inside the cramped actuator housing. Low sleep-mode quiescent current preserves backup-battery runtime in wireless damper nodes, and the TTL interface accepts PWM directly from common HVAC microcontrollers without external level shifting. Adjustable dead time prevents cross-conduction during the slow transitions of large damper gear trains, and the integrated current-sense comparator detects mechanical end-stop stall without a separate limit switch. AEC-Q100 screening (per Microchip USA listing) supports rooftop unit designs.
Recomendado
Solar Tracking and Small Pump Drives
The A4956KLPTR-T powers solar-tracker drive gears and small DC water-pump motors in off-grid installations, where the 5.5 V to 50 V supply range accommodates battery voltages from 12 V to 48 V without intermediate conversion. The exposed-pad TSSOP-EP package dissipates driver heat efficiently into the metal tracker housing, and the internal charge pump keeps high-side FETs fully enhanced even at the slow PWM rates used for sun-tracking slew. Integrated overcurrent protection guards against stall when a tracker encounters debris, and sleep mode cuts quiescent draw during nighttime standby. Parallel logic input accepts PWM directly from the tracker controller's GPIO pins.
Recomendado
Educational and Hobby Brushed DC Motor Kits
The A4956KLPTR-T's straightforward parallel TTL interface and exposed-pad 20-TSSOP-EP package make it a practical driver for university motor-control labs, hobby robotics kits, and STEM education platforms where students wire PWM signals directly from an Arduino or microcontroller dev kit. The wide 5.5 V to 50 V supply range lets a single board drive motors from small 6 V gear-motors up to 24 V / 36 V industrial motors used in classroom projects. Integrated overcurrent and thermal protection tolerates the wiring mistakes typical of a learning environment without destroying the external MOSFETs. The exposed pad simplifies soldering onto standard TSSOP breakout boards used in education.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para A4956KLPTR-T — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | A4956KLPTR | A4956KLP-T |
|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 20-TSSOP-EP | 20-TSSOP-EP - same | 20-TSSOP-EP - same |
| Motor Type | Brushed DC | Brushed DC | Brushed DC |
| Supply Voltage Range | 5.5 V to 50 V | 5.5 V to 50 V | 5.5 V to 50 V |
| Topology | Full-bridge external N-FET | Full-bridge external N-FET | Full-bridge external N-FET |
| Charge Pump (100% duty) | Internal | Internal | Internal |
| Overcurrent Protection | Yes (programmable) | Yes (programmable) | Yes (programmable) |
| Lifecycle Status | NOT FOR NEW DESIGN | NOT FOR NEW DESIGN | NOT FOR NEW DESIGN |
| Packaging Format | Tape & Reel (TR) | Tape & Reel (TR) | Tube (T) |
| Automotive Grade | AEC-Q100 (per Microchip USA listing) | AEC-Q100 (per Microchip USA listing) | AEC-Q100 (per Microchip USA listing) |
Principais diferenciais
- Same-package drop-in with identical pinout and electrical characteristics (vs A4956KLPTR)
- Tube-packaging variant for prototyping and low-volume production (vs A4956KLP-T)
Notas de projeto
The A4956KLPTR-T's TSSOP-EP package dissipates gate-drive losses through the exposed pad into the PCB copper pour, which must be soldered to a continuous ground-plane island on the top layer and stitched with thermal vias to inner ground planes. Estimated: at 50 V supply, 20 kHz PWM, and 1 nC Qg external MOSFETs, the A4956 gate-drive dissipation is roughly VBB * Qg * fsw = 50 V * 4 * 1e-9 * 20e3 = 40 mW per FET, or ~160 mW total, well within the TSSOP-EP rating when the exposed pad is properly soldered. Without the thermal pad, junction temperature can exceed 125 C even at modest switching frequencies.
Place the bootstrap capacitors (typically 100 nF to 1 uF X7R) directly between each BST pin and the corresponding phase node, with traces shorter than 5 mm to prevent ringing and incomplete high-side enhancement. Place the VCC decoupling capacitor (1 uF ceramic) within 3 mm of the VCC pin, and the charge-pump capacitor (typically 100 nF) close to the CP1/CP2 pins. Keep the high-current motor traces (VBB, phase outputs, GND) physically separated from the logic input traces to prevent dv/dt coupling into the parallel logic interface. A solid ground pour under the exposed pad is mandatory for thermal dissipation.
Common pitfalls with the A4956KLPTR-T include (1) selecting external N-FETs with insufficient VDS rating - use 60 V minimum for the 50 V supply ceiling, (2) omitting the charge-pump capacitor which causes the high-side gate drive to fail at 100% duty cycle, (3) exceeding the logic input maximum ratings by accidentally back-driving the TTL inputs above VCC, (4) not enabling the SLEEPn pin during power-up which can leave the outputs in an undefined state, and (5) failing to size the dead-time resistor which results in shoot-through and catastrophic FET failure. Always assert SLEEPn low at power-up and release it only after VCC and bootstrap capacitors are fully charged.
Informações de conformidade
RoHS compliant per DigiKey and Allegro product listings. AEC-Q100 qualification noted by Microchip USA distributor listing. Halogen-free status not explicitly stated in verified sources. Lifecycle: NOT FOR NEW DESIGN per Allegro datasheet footnote - restricted to existing customer applications.
