MC34921AE - Configurable Motor Driver with Power Supplies | NXP
N.º da peça: MC34921AE ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.2 | $132,00 |
| 100 | $11.85 | $1.185,00 |
| 500 | $10.4 | $5.200,00 |
| 1.000 | $9.25 | $9.250,00 |
MC34921AE Visão geral
A motor driver is an integrated circuit that translates low-current logic-level control signals into the high-current drive waveforms required to commutate DC, stepper, or brushless motors. By colocating motor drivers with their own supply regulators on the same silicon, the MC34921AE eliminates the supply-rail noise coupling that discrete regulators often produce, while shrinking PCB area and easing layout. It belongs to the broader family of motor driver ICs, which sit within power management and motion-control building blocks.
Key differentiating features include dual PWM-controlled DC motor outputs capable of delivering up to 1.0 A continuous per phase from a 5.0 V to 35 V supply, an integrated 5.0 V LDO that sources auxiliary loads up to 50 mA, a low-noise 3.3 V analog LDO for AVDD-style rails, and SPI-configurable PWM frequency and dead-time. Built-in protection functions include cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout, and cross-conduction prevention. The device is targeted at the commercial 0 C to +70 C temperature grade.
Typical applications include DSLR camera lens autofocus and image-stabilization actuators, consumer camcorder zoom and iris drives, small-format inkjet printers, and office automation paper-feed rollers. The wide input range supports direct connection to 2-cell lithium packs, wall-adapter rails, and USB-powered platforms when paired with external front-end conversion.
When designing with the MC34921AE, place the bulk input capacitor directly across the motor supply pins to absorb back-EMF transients, and keep the exposed pad (EP) soldered to a continuous copper plane to keep junction temperature within the 150 C limit during stall conditions. Use the SPI interface only after the device leaves reset to avoid register corruption.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a one-stop reference for engineers evaluating the MC34921AE for compact multi-motor platforms.
Alternativas drop-in para MC34921AE — 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:
MC34921AER2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33931
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33932
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC34931
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33926
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC34921AE Classificações máximas e características elétricas
| Product Type | Configurable Motor Driver with Power Supplies |
| Number of Motor Outputs | 2 (dual DC / stepper capable) |
| Motor Drive Architecture | PWM-controlled H-bridge (dual) |
| Peak Output Current per Phase | 1.0 A (typ) |
| Motor Supply Voltage (VM) | 5.0 V to 35 V |
| Logic Supply (VDD) | 3.3 V or 5.0 V (configurable) |
| Integrated 5.0 V LDO Load | Up to 50 mA |
| Integrated Analog LDO | 3.3 V low-dropout for analog rails |
| Control Interface | SPI (serial configuration) |
| PWM Frequency | Configurable via SPI |
| Protection Features | Current limit, thermal shutdown, UVLO, cross-conduction prevention |
| Faixa de temperatura de operação | 0 C to +70 C (commercial) |
| Temperature Grade | Commercial |
| Package / Pin Count | 64-LQFP-EP (10x10 mm) |
| Tipo de montagem | Surface Mount |
| Package Code (JEDEC) | HLFQFP |
| Status RoHS | Compliant |
Configuração de pinos do MC34921AE
| Pino 1 | OUT1A — Motor 1 output A |
| Pino 2 | OUT1B — Motor 1 output B |
| Pino 3 | GND — Ground |
| Pino 4 | OUT2A — Motor 2 output A |
| Pino 5 | OUT2B — Motor 2 output B |
| Pino 6 | VM — Motor supply voltage |
| Pino 7 | VDD — Logic supply |
| Pino 8 | CS — SPI chip select |
| Pino 9 | SCLK — SPI clock |
| Pino 10 | MOSI — SPI data in |
| Pino 11 | MISO — SPI data out |
| Pino 12 | INT — Interrupt output |
| Pino 13 | RST — Reset input |
| Pino 14 | VREG5V — 5V LDO output |
| Pino 15 | VREG3V3 — 3.3V LDO output |
| Pino 16 | GND — Ground |
Aplicações típicas
MC34921AE é adequado para 6 aplicaçãos: DSLR Camera Lens Autofocus, Camcorder Zoom / Iris Actuator, Small Inkjet Printer Carriage Drive, Office Automation Paper Feed, Consumer Robot Drive Modules, Camera Image Stabilization Actuator.
DSLR Camera Lens Autofocus
The MC34921AE's 1.0 A per-phase dual H-bridge fits directly into voice-coil motor (VCM) autofocus drivers where compact size and low noise are mandatory. Its integrated 3.3 V analog LDO supplies the image-sensor AVDD rail from the same VM supply, eliminating a discrete regulator and shrinking the lens-module PCB. Engineers benefit from configurable PWM frequency to tune the actuator's acoustic signature and from cycle-by-cycle current limiting that prevents VCM coil damage during mechanical stall.
Recomendado
Camcorder Zoom / Iris Actuator
Zoom, focus, and iris stepper motors in handheld camcorders draw up to 0.8 A continuous under typical zoom sweep profiles. The MC34921AE's PWM-controlled dual H-bridge provides this drive while its integrated 5 V LDO can power the camera's image processor I/O, simplifying the power tree. SPI-configurable acceleration and deceleration ramps reduce mechanical stress on the lens group, a key reliability differentiator for consumer camera designs.
Recomendado
Small Inkjet Printer Carriage Drive
Inkjet printers require quiet, precise bidirectional carriage motors plus paper-feed rollers. The MC34921AE drives both functions from one IC, with its SPI-controlled PWM allowing the OEM to tune the chopping frequency above the audible band. The device's cross-conduction prevention and thermal shutdown protect the carriage during paper jams when stall currents can persist for several seconds.
Recomendado
Office Automation Paper Feed
Copiers and small office printers use roller motors that demand moderate drive current and integration with digital logic rails. The MC34921AE provides the 1.0 A capability needed for paper pick and feed rollers while sourcing 3.3 V directly to the formatter MCU. Undervoltage lockout ensures the motors stay in high impedance during cold-start from depleted supplies, preventing brown-out-induced printer errors.
Recomendado
Consumer Robot Drive Modules
Compact robot vacuums and educational robots use dual brushed DC motors for wheels or pan/tilt mechanisms. The MC34921AE's 5 V to 35 V range accepts multi-cell lithium packs directly, and the on-chip 5 V LDO can power auxiliary sensors. Per-phase current-limit programming via SPI enables safe obstacle-stall recovery without tripping the main battery protection circuit.
Recomendado
Camera Image Stabilization Actuator
Optical image stabilization (OIS) voice-coil actuators in smartphones and action cameras demand microsecond-scale current control. The MC34921AE's configurable PWM frequency up to 100 kHz and tight cycle-by-cycle current limiting support the high-bandwidth control loops required for optical hand-shake correction. The on-die 3.3 V analog LDO powers the gyro/MEMS sensor AVDD from the same IC, keeping the optical module BOM to a minimum.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC34921AE — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC34921AER2 | MC33931 | MC33932 | MC34931 | MC33926 |
|---|---|---|---|---|---|---|
| Package | 64-LQFP-EP (10x10) | 64-LQFP-EP (10x10) - same | 8-SOIC | 28-SOIC | 8-SOIC | 32-QFN |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Number of Motor Outputs | 2 (dual DC/stepper) | 2 (dual DC/stepper) | 1 (single half-bridge) | 2 (dual half-bridge) | 1 (single half-bridge) | 2 (dual half-bridge) |
| Peak Output Current | 1.0 A per phase | 1.0 A per phase | 2.0 A | 5.0 A | 2.0 A | 5.0 A peak |
| Supply Voltage Range | 5.0 V to 35 V | 5.0 V to 35 V | 5.0 V to 28 V | 8.0 V to 36 V | 5.0 V to 28 V | 5.0 V to 32 V |
| Integrated Regulators | 5V LDO + 3.3V analog LDO | 5V LDO + 3.3V analog LDO | None (external required) | None | None | Internal charge pump |
| Control Interface | SPI | SPI | PWM/direct logic | PWM/direct logic | PWM/direct logic | PWM/direct logic |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Lifecycle Status | NRND | NRND | Active | Active | Active | Active |
Principais diferenciais
- Two motor channels plus integrated 5V/3.3V LDOs in one 64-LQFP-EP (vs MC33931)
- SPI-configurable PWM frequency for tuned acoustic profile (vs MC33932)
- Wider supply range accepts more battery topologies (vs MC33926)
Notas de projeto
The MC34921AE's thermal performance depends entirely on the exposed pad (EP) being soldered to a continuous ground plane. Estimated: at 1.0 A per phase with a 12 V to 5 V typical ratio and full H-bridge dissipation, the die-to-ambient rise (theta_JA ~30 C/W on a 4-layer board) stays inside the 150 C shutdown limit, but a stalled motor at 35 V can push junction close to thermal shutdown. Always stitch EP with at least six thermal vias to the inner ground plane.
Place the VM bulk capacitor (at least 47 uF / 50 V) within 5 mm of pins 6 and 16 to absorb motor back-EMF, and add a 100 nF ceramic directly across the supply pins for high-frequency decoupling. Keep motor output traces short and as a differential pair to reduce radiated EMI; gate the SPI lines with a 33 ohm series resistor if the host is more than 50 mm away.
Do not apply SPI writes to the MC34921AE before VDD crosses its UVLO threshold (~2.7 V) or before the RST pin is released; the device ignores writes and flags an SPI error in those conditions. Motor coil inductance can produce negative voltage spikes on the OUT pins during switching - the internal flyback handling is only rated for 1.0 A continuous; if your mechanical load has higher inductance, add external Schottky flyback diodes in parallel with each output.
Informações de conformidade
RoHS compliant per NXP product page. Commercial temperature grade - not AEC-Q100 qualified. NRND lifecycle status requires design team to plan migration path.
