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NXP Semiconductors MC34923EG
- Part No.:
- MC34923EG
- Manufacturer:
- NXP Semiconductors
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC34923EG.pdf
- Description:
- IC MOTOR DRIVER 4.5V-5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,717
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Product details
Overview
MC34923EG from Freescale Semiconductor (formerly Motorola) is a full-bridge PWM motor driver IC designed for pulse-width modulated current control of brushed DC motors. It delivers ±2.0 A continuous output current at up to 45 V supply voltage, features programmable mixed/fast/slow current-decay modes via 3-wire serial interface, and integrates synchronous rectification to reduce power dissipation in motor drive applications such as automotive seat adjusters and industrial actuators.
For engineers reviewing the MC34923EG datasheet, MC34923EG pinout, MC34923EG application, or MC34923EG equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply-ready availability details - all grounded in Freescale's official preliminary technical data (Rev 0, 05/2003).
Technical Context
The MC34923EG implements a fixed-off-time PWM current-control architecture with programmable blank time (D0–D1), off-time (D2–D6), and fast-decay portion (D7–D10), enabling precise regulation of motor winding current. Its internal charge pump (CP1/CP2/VB) generates boosted gate drive for high-side N-channel MOSFETs, while synchronous rectification (controlled by D11–D12) actively switches low-RDS(ON) paths during decay to replace lossy body diodes.
Control logic accepts both external PWM/ENABLE + DIR inputs and internal serial-programmed PWM modes (selected via PWMMODE and D17). Fault protection includes thermal shutdown at 165°C with 15°C hysteresis, undervoltage lockout on VDD (4.2 V threshold), and crossover-current detection - all operating without special power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±2.0 A continuous - supports medium-power DC motors without external heatsinking under typical PCB copper area (RθJA = 56°C/W). |
| Supply Voltage Range | VBB = 20–45 V - compatible with 24 V industrial and 12–42 V automotive battery systems. |
| RDS(ON) | 300 mΩ typical @ 25°C - limits conduction loss to ≤1.2 W per channel at 2 A, reducing thermal stress. |
| Serial Interface | 3-wire (CLOCK/DATA/STROBE), 20-bit frame - enables runtime reconfiguration of decay mode, blank time, and synchronous rectification without MCU firmware changes. |
| Thermal Shutdown | 165°C trip with 15°C hysteresis - protects against sustained overload or poor heatsinking while allowing recovery after fault removal. |
| Current Sense Reference | VREF input (0–2.6 V) with SPAN-selectable 5× or 10× division - sets precise ITRIP = VREF/(5 or 10)·RS, supporting accurate current limiting across temperature. |
| Oscillator Input | 2.9–6.1 MHz square wave (OSC pin) - determines PWM timing resolution; e.g., 4 MHz yields off-time adjustment from 1.75 µs to 63.75 µs in 2 µs steps. |
Pinout & Package
MC34923EG is housed in a 24-lead SOIC wide-body (SOICW) package, case 751E-04, with 0.600-inch body width and standard 1.27 mm lead pitch. The package supports surface-mount assembly and provides thermal performance of RθJA = 56°C/W with 3.57 in² copper ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VB | Boost voltage storage node | Reservoir for charge-pump-generated high-side gate drive voltage; requires 0.22 µF ceramic capacitor to VBB for stable operation. |
| CP1, CP2 | Charge pump switching capacitor terminals | Form flying-capacitor network with external 0.22 µF ceramic cap; enables >VBB gate drive for efficient high-side N-MOSFET control. |
| DIR | Direction logic input | Controls motor polarity (forward/reverse); combined with D15 bit for dual-mode direction control in internal PWM mode. |
| PWM/ENABLE | H-bridge enable input | Active-high logic signal that releases H-bridge from tri-state; also used with D14 to select chopped or ON state in serial-controlled mode. |
| DCMA, DCMB | H-bridge output terminals | High-current (±2 A), high-voltage (≤45 V) motor drive outputs; connected directly to motor terminals with minimal trace inductance. |
| SENSE | Current sense input | Connects to low-side sense resistor (RS); comparator monitors voltage drop to trigger current-limiting action when ILOAD × RS ≥ VREF/5 or /10. |
| VBB | H-bridge voltage supply | Main motor power rail (20–45 V); decoupled with ≥47 µF electrolytic capacitor near device for transient current handling. |
| VDD | Logic supply | 5.0 V ±0.5 V digital supply for internal logic, serial interface, and gate drivers; includes UVLO (4.2 V) for safe startup. |
| VREG | Bandgap reference decoupling | Internal ~5 V regulator output; requires 0.22 µF ceramic capacitor to ground to stabilize sink-side gate drive and fault monitoring. |
| DATA, CLOCK, STROBE | 3-wire serial interface | Asynchronous serial port (20-bit frame) for configuring decay mode, blank time, synchronous rectification, and sleep mode without external hardware changes. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable current-decay modes | Mixed/fast/slow decay selection via serial port or PWMMODE pin - enables optimization of torque ripple, braking behavior, and EMI in different motor loads. |
| Synchronous rectification | Configurable active/passive/disabled mode (D11–D12) - replaces body-diode conduction with low-RDS(ON) FET paths during decay, cutting power loss by >50% vs. passive decay. |
| Integrated charge pump | Self-contained VB generation using CP1/CP2 and external 0.22 µF cap - eliminates need for external high-voltage bias supply for high-side gate drive. |
| Current regulation accuracy | VREF-based trip threshold with SPAN-selectable 5×/10× division - achieves tight current limit tolerance (<±5% typical) independent of VBB fluctuations. |
| Fault protection suite | Thermal shutdown (165°C), VDD UVLO (4.2 V), VB/VREG monitoring, and crossover-current detection - ensures robust operation without external supervision circuitry. |
Applications
| Automotive Seat Adjustment | Industrial Linear Actuators |
|---|---|
|
Use Scenario: Bidirectional positioning of powered vehicle seats using 24 V DC motors with variable load inertia. IC Role / Device Role / Timing Role: Full-bridge driver executing direction reversal and PWM speed control; internal fixed-off-time current regulation maintains consistent torque across battery voltage range (10–16 V). Use Value: Synchronous rectification reduces heat buildup during frequent stop/start cycles, extending motor and driver lifetime in confined cabin space. |
Use Scenario: Precision extension/retraction of factory automation linear slides carrying 5–10 kg payloads. IC Role / Device Role / Timing Role: Current-regulated H-bridge delivering ±2.0 A to maintain constant force during acceleration/deceleration; programmable blank time prevents false current-limit triggering from inductive kick. Use Value: Serial-configurable decay modes allow tuning of mechanical settling time - slow decay for smooth stopping, mixed decay for faster response without overshoot. |
| Medical Bed Positioning | Robotics Joint Control |
|
Use Scenario: Quiet, reliable height and backrest adjustment in hospital beds powered from 24 V DC supplies. IC Role / Device Role / Timing Role: Motor driver with thermal shutdown and undervoltage lockout ensuring fail-safe operation; sleep mode (D19) minimizes standby current (<2 µA) when idle. Use Value: Low RDS(ON) (300 mΩ) and synchronous rectification keep audible noise and heat generation below clinical environment thresholds. |
Use Scenario: Torque-controlled articulation of robotic arm joints using small-frame DC motors with encoder feedback. IC Role / Device Role / Timing Role: High-speed bridge driver (6.1 MHz OSC support) synchronized to motion controller PWM; current sense path isolated from system ground to avoid encoder noise coupling. Use Value: Independent SENSE ground return and 0.1 µF local bypass minimize current-sense error (<1%), critical for closed-loop torque accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge PWM motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8876PWPR | Higher 3.6 A current rating, integrated current sense amplifier, no serial interface - uses analog VREF and external PWM only. | Better suited for higher-current, lower-complexity designs where serial configuration is unnecessary and board space allows larger thermal pad. | Choose DRV8876PWPR if peak current exceeds 2 A or if eliminating serial communication overhead simplifies firmware. |
| TB9051FTG | Automotive-grade AEC-Q100 qualified, 4.5 A rating, SPI interface, built-in diagnostics - operates from 4.5–28 V, lacks charge pump (requires external bootstrap). | Targeted at automotive body electronics requiring functional safety compliance; not drop-in due to different voltage range and pinout. | Choose TB9051FTG for new automotive programs needing ASIL-B readiness and extended diagnostic coverage beyond MC34923EG's capability. |
Compared with DRV8876PWPR and TB9051FTG, the MC34923EG offers unique value in legacy industrial and automotive systems where serial configurability of decay behavior and self-contained charge pump simplify layout and enable fine-grained current control without adding external components or sacrificing voltage range.
Availability
MC34923EG is available at Aetrix Electronics and suitable for automotive seat control, industrial actuator, medical bed positioning, and robotics joint drive applications requiring stable component supply, long-lifecycle support, and proven reliability in harsh environments.
Supply support for MC34923EG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of analog and mixed-signal ICs for automotive, industrial, and consumer applications, known for robust power management and motor control solutions.
The MC34923EG belongs to Freescale's SMARTMOS motor driver family, engineered specifically for high-efficiency, current-regulated DC motor control in space-constrained and thermally demanding environments.
FAQ
What is the maximum continuous output current supported by the MC34923EG?
The MC34923EG supports ±2.0 A continuous output current at ambient temperatures up to 85°C with adequate PCB copper area (3.57 in² ground plane). This rating assumes VBB ≤ 45 V, proper decoupling, and thermal derating per the datasheet's power dissipation curve - exceeding 2 A risks thermal shutdown activation unless heatsinking is enhanced.
Does the MC34923EG require an external charge pump circuit?
No, the MC34923EG integrates a charge pump circuit that generates boosted gate drive voltage for its high-side N-channel MOSFETs. It requires only two external 0.22 µF ceramic capacitors: one between CP1 and CP2, and another between VB and VBB. No external bias supply or discrete charge pump IC is needed.
How does the MC34923EG implement current limiting and regulation?
The MC34923EG regulates motor current using an internal fixed-off-time PWM controller. Current is sensed across an external shunt resistor (RS) connected to the SENSE pin. When the voltage drop reaches VREF/5 or VREF/10 (selected by SPAN pin and D16), the source driver turns off for a programmable off-time period - maintaining precise average current regardless of supply voltage or motor inductance.
Can the MC34923EG operate in both external PWM and internal PWM modes?
Yes, the MC34923EG supports dual control modes: external PWM via the PWM/ENABLE and DIR pins, or internal PWM generated by its on-chip timer (configured via serial port bits D2–D10). Mode selection is controlled by the PWMMODE pin and serial bit D17 - enabling flexible integration with microcontrollers that may or may not generate PWM signals.
What protection features are built into the MC34923EG?
The MC34923EG includes thermal shutdown (trip at 165°C, 15°C hysteresis), undervoltage lockout on VDD (4.2 V enable threshold), VB and VREG supply monitoring, and crossover-current protection. These features disable outputs automatically during fault conditions and recover autonomously once the fault is cleared - no external supervision circuitry is required for basic protection.
MC34923EG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (2)
- Interface:
- Serial
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 2A
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- 20V ~ 45V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
MC34923EG FAQ
1.How can I place an order for MC34923EG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34923EG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC34923EG reliable?
The price and inventory of MC34923EG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34923EG is usually 5 days.
3.What payment methods are accepted for MC34923EG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34923EG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34923EG?
MC34923EG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34923EG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC34923EG?
For technical support, including MC34923EG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34923EG requirements.
6.How does Aetrix verify that MC34923EG is sourced from the original manufacturer or authorized distributors?
All MC34923EG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC34923EG meets industry standards.
7.What is the process for return or replacement of MC34923EG?
All MC34923EG units undergo pre-shipment inspection (PSI). If there is an issue with MC34923EG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC34923EG part is unused and in its original packaging.
Return procedure for MC34923EG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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