MC34931EK - 5A H-Bridge DC Motor Driver | NXP Semiconductors
Référence : MC34931EK ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $11.9 | $11,90 |
| 10 | $10.8 | $108,00 |
| 100 | $9.1 | $910,00 |
| 500 | $7.85 | $3 925,00 |
| 1 000 | $6.95 | $6 950,00 |
MC34931EK Présentation
An H-Bridge motor driver is a 4-switch (typically two high-side and two low-side MOSFETs) topology that allows a DC motor to be driven in both forward and reverse directions and actively braked; the MC34931EK integrates all four switches monolithically, eliminating external half-bridges. Within the broader product taxonomy it belongs to motor drivers -> gate drivers -> power management -> semiconductor, and is commonly classified as a fully-integrated brushed DC motor driver because the power stage, control logic, and current-sense amplifier share the same die.
Key features include a continuous output current rating of 5 A (with proper PCB thermal management and up to 36 V load-dump survivability), real-time load current monitoring through a current-sense feedback pin, programmable PWM switching up to 11 kHz (MC34931EK; the -SEK variant reaches 20 kHz), a dedicated Sleep mode for quiescent-current-sensitive applications, automatic thermal protection back-off that gracefully reduces output drive when die temperature exceeds safe limits, and an exposed thermal pad enabling direct PCB heatsinking. The device targets operation between -40 C and +125 C junction temperature.
The MC34931EK is built using NXP's SMARTMOS analog mixed-signal process with dual N-channel DMOS output stages, an integrated charge pump for the high-side gate drive, cross-conduction (dead-time) protection, under-voltage lockout, and a transconductance-type current-sense amplifier that develops a ground-referenced analog voltage proportional to load current. This monolithic approach reduces PCB area compared to discrete MOSFET bridges plus a separate gate driver IC.
Typical applications include industrial PLC solenoid and valve drives, automotive body modules (window lift, door lock, seat adjust, HVAC flaps, mirror adjust), battery-powered robotic actuators, robotics and small mobility platforms, and appliances such as washers, dishwashers, and refrigerators that use DC brushed or DC servo motors. The 5 V to 28 V supply range covers both 12 V automotive and 24 V industrial rails.
When designing with the MC34931EK, calculate worst-case conduction dissipation as I^2 * R_DS(on) for each FET plus switching losses at your chosen PWM frequency, and ensure the exposed pad is soldered to at least 1 square inch of top-layer copper to keep junction temperature within ratings.
This page synthesizes distributor pricing, same-family and cross-brand drop-in alternatives, and practical design notes not consolidated on any individual distributor page.
Alternatives de remplacement direct pour MC34931EK — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC34931SEK
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC34931EK
✅ Remplacement direct✓ En stock
$6.95 / unité
Voir la fiche technique →MC34931EK Valeurs maximales et caractéristiques électriques
| Topologie | Monolithic H-Bridge (2 HS + 2 LS N-FETs) |
| Operating Voltage Range | 5 V to 28 V |
| Absolute Maximum Supply Voltage | 36 V (load-dump tolerant) |
| Continuous Output Current | 5 A (with proper PCB thermal design) |
| Technology | SMARTMOS mixed-signal DMOS |
| Maximum PWM Frequency | 11 kHz (MC34931EK) |
| Current Sense Feedback | Yes (analog CS pin) |
| Sleep Mode | Yes (low Iq state) |
| Thermal Protection | Automatic thermal back-off + shutdown |
| Under-Voltage Lockout | Yes |
| Cross-Conduction Protection | Yes (integrated dead time) |
| Boîtier | 32-pin SOICW-EP (exposed thermal pad) |
| Température de jonction en fonctionnement | -40 C to +125 C |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de MC34931EK
| Broche 1 | VM — Motor power supply (5 V to 28 V) |
| Broche 2 | GND — Power ground |
| Broche 3 | OUT1 — H-Bridge output 1 (motor terminal A) |
| Broche 4 | OUT2 — H-Bridge output 2 (motor terminal B) |
| Broche 5 | GND — Power ground |
| Broche 6 | VM — Motor power supply |
| Broche 7 | NC — Not connected (per datasheet) |
| Broche 8 | NC — Not connected (per datasheet) |
| Broche 9 | EN — Enable input |
| Broche 10 | IN1 — Logic input 1 (direction/PWM) |
| Broche 11 | IN2 — Logic input 2 (direction/PWM) |
| Broche 12 | SLEEP — Sleep mode control |
| Broche 13 | CS — Current sense feedback output |
| Broche 14 | FB — Current sense feedback reference |
| Broche 15 | VDD — Logic supply (typically 5 V) |
| Broche 16 | GND — Logic ground |
| Broche 17 | NC — Not connected (per datasheet) |
| Broche 18 | NC — Not connected (per datasheet) |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
| Broche 21 | NC — Not connected (per datasheet) |
| Broche 22 | NC — Not connected (per datasheet) |
| Broche 23 | OUT1 — H-Bridge output 1 (parallel bond to pin 3) |
| Broche 24 | OUT2 — H-Bridge output 2 (parallel bond to pin 4) |
| Broche 25 | GND — Power ground |
| Broche 26 | GND — Power ground |
| Broche 27 | VM — Motor power supply |
| Broche 28 | VM — Motor power supply |
| Broche 29 | NC — Not connected (per datasheet) |
| Broche 30 | NC — Not connected (per datasheet) |
| Broche 31 | NC — Not connected (per datasheet) |
| Broche 32 | NC — Not connected (per datasheet) |
Applications typiques
MC34931EK convient pour 6 applications: Industrial DC Brushed Motor Drive, Automotive Body Electronics, Home Appliance Motor Control, Robotics and Small Mobility Actuators, Solenoid and Valve Drivers, Battery-Powered DC Tools and Pumps.
Industrial DC Brushed Motor Drive
The MC34931EK's 5 A continuous output and 5 V to 28 V supply range cover most 24 V industrial brushed-DC motor rails used in conveyor drives, small pumps, and valve actuators. According to the NXP datasheet, the integrated H-Bridge plus current-sense feedback enables closed-loop torque control without external shunt resistors, while PWM up to 11 kHz supports DC- or low-frequency operation. Placed between the 24 V bus and the brushed motor with a 100 uF bulk capacitor on VM, the part replaces a discrete half-bridge + driver pair and cuts PCB area by ~40 percent, while thermal back-off prevents catastrophic shutdown when motor stall currents exceed ratings.
Recommandé
Automotive Body Electronics
In 12 V automotive body modules such as window lift, door lock, mirror adjust, seat positioning, and HVAC damper actuators, the MC34931EK's 36 V load-dump survivability and SMARTMOS ruggedness give it long use across NXP body-electronics designs. According to the NXP datasheet, the integrated dead-time and cross-conduction protection prevent shoot-through that would otherwise damage the half-bridge during direction reversal, and the sleep mode drops quiescent current for key-off battery preservation. With the exposed pad soldered to a 1 square inch copper pour, the part handles the repetitive inrush of window-lift and seat motors at 12 V without external heatsinking in most cases.
Recommandé
Home Appliance Motor Control
White goods such as washing machines, dishwashers, refrigerator dampers, and small kitchen appliances commonly use 12 V to 24 V brushed-DC motors for drain pumps, dispenser valves, and door-latch mechanisms where the MC34931EK fits naturally. The integrated current-sense amplifier lets the appliance MCU detect stall conditions (blocked drain pump or jammed valve) without an external shunt, protecting the motor and the PCB. According to the NXP datasheet, the part's wide 5 V to 28 V supply range supports both 12 V and 24 V appliance platforms from a single BOM line, simplifying SKU management.
Recommandé
Robotics and Small Mobility Actuators
Battery-powered robotics platforms such as small AGVs, educational robots, and personal-mobility actuator nodes use brushed-DC gear motors where the MC34931EK's monolithic integration saves PCB area and weight. The sleep mode reduces quiescent current during idle periods, extending runtime on Li-ion or LiFePO4 packs. According to the NXP datasheet, the current-sense output allows torque-aware control algorithms for traction and steering motors, and the SOICW-EP-32 footprint is large enough to dissipate the ~3 W typical at 1-2 A continuous load without an external heatsink.
Recommandé
Solenoid and Valve Drivers
Industrial PLCs and process-control systems drive 24 V solenoids, latching valves, and pneumatic actuators using the MC34931EK as a bidirectional half-H switch: forward to open, reverse to close (or to actively brake). The integrated current-sense amplifier makes closed-loop proportional control feasible without discrete shunt amplifiers. According to the NXP datasheet, the part's 36 V absolute maximum plus thermal back-off withstands the back-EMF of de-energized solenoids, and the dead-time control prevents cross-conduction when toggling direction at high rates.
Recommandé
Battery-Powered DC Tools and Pumps
Cordless tools, portable pumps, and small electric vehicles use 18 V to 24 V brushed-DC motors where the MC34931EK provides compact bidirectional drive and stall protection. The current-sense output lets the controller detect stall and shut down before the battery is drained or the motor windings overheat. According to the NXP datasheet, the part is designed to survive large inrush currents during motor startup, and the exposed thermal pad keeps the junction temperature low even when driving the motor at rated load continuously.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC34931EK — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC34931SEK | MC34931EK (revised datasheet) | MC33926 |
|---|---|---|---|---|
| Package | SOICW-EP-32 | SOICW-EP-32 - same | SOICW-EP-32 - same | HVQFN-28 - different |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Continuous Output Current | 5 A | 5 A | 5 A | 5 A peak / 3 A continuous |
| Technology | SMARTMOS DMOS | SMARTMOS DMOS | SMARTMOS DMOS | SMARTMOS |
Principaux différenciateurs
- Integrated current-sense feedback without external shunt (vs MC33882)
- Higher continuous current than MC33926 (vs MC33926)
- SOICW-EP-32 wide-body package for better thermal performance (vs MC33926)
Notes de conception
At 24 V supply and 5 A continuous output, conduction loss is I^2 * R_DS(on) for each of the two active FETs in the H-Bridge. Estimated: assuming R_DS(on) ~= 150 mohm per FET and 50 percent duty cycle, total dissipation reaches approximately 1.9 W plus switching loss, requiring the SOICW-EP exposed pad to be soldered to at least 1 square inch of top-layer copper. Without this copper, the part will enter thermal back-off and reduce output drive current.
Keep VM supply traces short and use a 100 uF or larger low-ESR bulk capacitor within 25 mm of the VM pins, plus a 100 nF ceramic bypass capacitor within 5 mm of the IC, according to the NXP datasheet application information. The exposed thermal pad MUST be soldered to a ground plane with multiple thermal vias to dissipate heat from the die. Avoid routing logic signals (IN1, IN2, EN, SLEEP, CS) across the H-Bridge output traces to prevent noise coupling.
PWM frequencies above 11 kHz on the MC34931EK variant cause high-side gate-drive under-enhancement and reduced output amplitude according to the NXP datasheet; if your application requires higher PWM rates, choose the MC34931SEK (20 kHz) or derate duty cycle to 15-85 percent. Also ensure the VDD logic supply is stable before the VM motor supply rises, or under-voltage lockout will prevent startup and may latch the part into a fault state.
Add a TVS diode (e.g., 33 V SMA) across VM to GND if the design is exposed to automotive load-dump transients beyond 36 V. According to the NXP datasheet, the absolute maximum on VM is 36 V; sustained transients or unregulated supply rails can exceed this and damage the die. A flyback diode is not needed when driving a brushed DC motor because the internal H-Bridge recirculates motor current through the high-side or low-side FETs.
Informations de conformité
RoHS and lead-free status per NXP product information. AEC-Q100 automotive qualification depends on the specific variant ordered; standard MC34931EK is industrial grade. Confirm with NXP field application support for automotive PPAP requirements.
