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NXP Semiconductors MC34923EGR2
- Part No.:
- MC34923EGR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC34923EGR2.pdf
- Description:
- IC MOTOR DRIVER 4.5V-5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,971
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Product details
Overview
MC34923EGR2 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, 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/mirror actuators and industrial linear motion systems.
For engineers reviewing the MC34923EGR2 datasheet, MC34923EGR2 pinout, MC34923EGR2 application, or MC34923EGR2 equivalent, key selection criteria include its 24-pin SOICW package, internal fixed off-time PWM timing, thermal shutdown with 15°C hysteresis, 270 mΩ typical RDS(ON), and support for external PWM/ENABLE or internal PWM current regulation - all critical for robust, low-loss H-bridge motor control designs.
Technical Context
The MC34923EGR2 implements a dual-mode PWM architecture: internal fixed-off-time current control (programmable via serial port bits D2–D10) and external PWM/ENABLE modulation. Its charge pump (CP1/CP2/VB) generates boosted gate drive for high-side N-channel MOSFETs, enabling operation up to 45 V on VBB while maintaining logic-level compatibility on VDD (4.5–5.5 V).
Current regulation relies on a precision sense comparator referenced to VREF (0–2.6 V), with trip threshold configurable via SPAN pin and serial bit D16 to divide VREF by 5 or 10. Protection includes thermal shutdown at 165°C (15°C hysteresis), undervoltage lockout on VDD (4.2 V threshold), crossover-current detection, and VB/VREG fault monitoring - all disabling outputs without requiring 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 (3.57 in² ground plane). |
| Supply Voltage Range | VBB = 20–45 V - compatible with 24 V industrial and 12/24 V automotive battery systems; VDD = 4.5–5.5 V for TTL/CMOS logic interfacing. |
| RDS(ON) | 300 mΩ typical (25°C), 450 mΩ max (150°C) - limits conduction loss to ≤1.8 W per channel at 2 A, enabling efficient thermal design. |
| Current Decay Modes | Programmable slow, fast, or mixed decay via serial interface - enables precise control of motor braking, torque ripple, and recirculation path efficiency. |
| Serial Interface | 3-wire (CLOCK/DATA/STROBE), 20-bit frame - allows dynamic reconfiguration of blank time, off-time, fast-decay duration, and synchronous rectification mode during operation. |
| Thermal Protection | Shutdown at 165°C junction temperature with 15°C hysteresis - prevents permanent damage during overload or poor heatsinking; resumes operation only after cooling below 150°C. |
| Logic Input Thresholds | VIN(1) ≥ 2.0 V, VIN(0) ≤ 0.8 V - ensures noise immunity and compatibility with standard 5 V microcontrollers without level-shifting. |
Pinout & Package
MC34923EGR2 is housed in a 24-lead SOIC wide-body (SOICW) package, case 751E-04, with 15.25 mm × 7.5 mm footprint and 2.5 mm height. The package features exposed thermal pad (not electrically connected) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VB) | Boost voltage storage node | Reservoir for charge pump output; must be decoupled to VBB with 0.22 µF ceramic capacitor to sustain high-side gate drive during PWM transitions. |
| 4 (DIR) | Direction control input | Logic-level signal determining motor polarity; combined with serial bit D15 to set forward/reverse state in internal PWM mode. |
| 9 (PWM/ENABLE) | H-bridge enable input | Active-high logic input that releases H-bridge from tri-state; when used with serial bit D14, selects chopped (PWM) or fully ON output mode. |
| 13 (VREF) | Current limit reference voltage | Analog input (0–2.6 V) setting ITRIP = VREF/(5×RS) or VREF/(10×RS) depending on SPAN pin and serial bit D16. |
| 16 (DCMA), 21 (DCMB) | H-bridge motor outputs | High-current, high-voltage terminals driving motor terminals; each rated for ±2.0 A continuous with integrated body diodes and synchronous rectification control. |
| 17 (SENSE) | Current sense input | Connects to low-side sense resistor (RS); comparator monitors voltage drop across RS to trigger current limiting - requires dedicated ground return path. |
| 20 (VBB) | H-bridge supply voltage | Main motor power rail (20–45 V); supplies both load current and charge pump input; requires ≥47 µF electrolytic decoupling near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification control | Configurable active/passive/disabled via serial bits D11–D12 - replaces lossy body diodes with low-RDS(ON) FET paths during current decay, reducing power dissipation by >40% vs. passive decay. |
| Programmable current decay modes | Mixed/fast/slow decay selected via serial interface and PWMMODE pin - enables optimized trade-offs between torque ripple (slow), braking strength (fast), and EMI/noise (mixed). |
| Internal fixed off-time PWM timer | 20-bit programmable off-time (1.75–63.75 µs at 4 MHz OSC) - provides deterministic current regulation independent of MCU timing, simplifying firmware and improving loop stability. |
| Integrated charge pump | Generates >VBB gate drive for high-side N-FETs using CP1/CP2 switching capacitors - eliminates need for external bootstrap circuitry or P-FETs, reducing BOM count and layout complexity. |
| Comprehensive fault protection | Thermal shutdown (165°C), VDD UVLO (4.2 V), VB/VREG monitoring, and crossover-current detection - all disable outputs simultaneously and latch until fault clears, ensuring system-level safety. |
Applications
| Automotive Seat Actuators | Industrial Linear Positioners |
|---|---|
|
Use Scenario: Bidirectional control of 12–24 V DC motors moving automotive seat tracks and backrests under variable mechanical load. IC Role / Device Role / Timing Role: Full-bridge driver executing direction reversal and PWM speed control; internal current regulation maintains consistent torque across battery voltage sag and temperature drift. Use Value: ±2.0 A rating and 45 V VBB withstand accommodate peak stall currents and load dump transients; thermal shutdown prevents latch-up during jam conditions. |
Use Scenario: Precision positioning of CNC machine axes or automated test equipment stages using 24 V brushed DC motors with encoder feedback. IC Role / Device Role / Timing Role: Motor driver implementing smooth ramping, controlled braking, and current-limited acceleration via programmable decay modes and synchronous rectification. Use Value: Mixed-decay mode minimizes torque ripple during low-speed motion; serial reconfigurability allows real-time adaptation to changing inertia or friction profiles. |
| Medical Pump Drives | Robotics Joint Actuators |
|
Use Scenario: Driving peristaltic or syringe pumps in portable medical devices where silent, low-EMI operation and precise flow control are critical. IC Role / Device Role / Timing Role: H-bridge delivering regulated current to motor windings; slow-decay mode enables gentle, low-noise braking essential for fluid handling integrity. Use Value: Low RDS(ON) (300 mΩ typ.) and synchronous rectification reduce heat generation in sealed enclosures; sleep mode (bit D19) cuts quiescent current to 2 µA for battery longevity. |
Use Scenario: Compact, high-torque actuation of robotic arm joints powered by 24 V DC motors with intermittent duty cycles and frequent direction changes. IC Role / Device Role / Timing Role: Motor controller managing rapid direction reversal, dynamic braking, and overcurrent protection during collision events or stalling. Use Value: Crossover-current protection prevents shoot-through during DIR transitions; fast-decay mode enables aggressive braking to meet joint position error tolerances <1°. |
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 |
|---|---|---|---|
| TB9051FTG | 40 V max VBB, 3.5 A continuous, integrated current sense amplifier, SPI interface, smaller HTSSOP-28 package | Better suited for space-constrained automotive ECUs; lacks programmable blank time and mixed-decay flexibility of MC34923EGR2 | Choose TB9051FTG for higher current and integrated diagnostics; retain MC34923EGR2 when legacy serial protocol compatibility or fine-grained decay tuning is required. |
| VNH7040AS | 41 V max VBB, 2.2 A continuous, dual half-bridge (not full-bridge), SPI interface, built-in watchdog and fault reporting | Requires external bridging logic for full-H-bridge; superior diagnostic coverage but less direct functional equivalence | Choose VNH7040AS for ASIL-B compliance and system-level fault logging; select MC34923EGR2 for simpler, cost-optimized full-bridge integration with minimal external components. |
Compared with TB9051FTG and VNH7040AS, the MC34923EGR2 offers unique programmability of blank time and mixed-decay timing via its 20-bit serial interface, making it preferable for applications demanding precise current waveform shaping - especially where thermal constraints favor synchronous rectification over discrete Schottky solutions.
Availability
MC34923EGR2 is available at Aetrix Electronics and suitable for automotive seat/mirror control, industrial linear positioners, medical pump drives, and robotics joint actuators requiring stable component supply across extended product lifecycles.
Supply support for MC34923EGR2 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) is a global leader in automotive and industrial analog/mixed-signal ICs, known for robust power management and motor control solutions engineered for harsh environments.
The MC34923EGR2 belongs to Freescale's SMARTMOS motor driver family, designed specifically for high-reliability, current-regulated DC motor control in automotive body electronics and industrial automation where thermal resilience and programmable decay behavior are critical.
FAQ
What is the maximum operating voltage for MC34923EGR2?
The MC34923EGR2 supports a load supply voltage (VBB) up to 45 V continuously, with absolute maximum rating of 48 V. Its logic supply (VDD) operates from 4.5 V to 5.5 V. Exceeding 45 V during normal operation risks violating safe operating area limits, particularly under high-current or elevated-temperature conditions - always verify derating curves in the datasheet for your specific thermal environment.
Does MC34923EGR2 support both internal and external PWM control?
Yes, MC34923EGR2 supports dual PWM modes: internal fixed-off-time current control (configured via serial interface bits D2–D10 and OSC input) and external PWM/ENABLE modulation (using the PWM/ENABLE pin directly). In internal mode, the device generates its own PWM waveform; in external mode, it acts as a gated H-bridge synchronized to an MCU-generated signal - both modes retain full current regulation and decay mode selection.
How does the synchronous rectification feature improve efficiency in MC34923EGR2?
MC34923EGR2's synchronous rectification replaces power-dissipating body diodes with actively driven low-RDS(ON) FET paths during current decay. When enabled (via serial bits D11–D12), it reduces conduction loss by up to 60% compared to passive decay, lowering junction temperature and enabling higher continuous current in thermally constrained layouts - especially beneficial in sealed enclosures or high-duty-cycle applications.
What is the purpose of the SPAN pin on MC34923EGR2?
The SPAN pin on MC34923EGR2 selects the VREF divider ratio used to set current trip threshold: when SPAN matches serial bit D16, VREF is divided by 10 (ITRIP = VREF/10RS); otherwise, it's divided by 5 (ITRIP = VREF/5RS). This allows flexible scaling of current sensing range - e.g., using 0.1 Ω RS with 2.5 V VREF yields 2.5 A or 5.0 A trip points - without changing hardware.
Can MC34923EGR2 be used in sleep mode to reduce power consumption?
Yes, MC34923EGR2 includes a dedicated sleep mode activated by setting serial bit D19 high for ≥1.0 ms. In sleep mode, the charge pump, regulator, and most internal circuitry are disabled, reducing quiescent current to 2 µA. Outputs remain tri-stated; wake-up requires reinitializing the serial port and re-enabling drivers - making it ideal for battery-powered devices needing ultra-low standby power.
MC34923EGR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MC34923EGR2 FAQ
1.How can I place an order for MC34923EGR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34923EGR2 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 MC34923EGR2 reliable?
The price and inventory of MC34923EGR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34923EGR2 is usually 5 days.
3.What payment methods are accepted for MC34923EGR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34923EGR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34923EGR2?
MC34923EGR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34923EGR2 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 MC34923EGR2?
For technical support, including MC34923EGR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34923EGR2 requirements.
6.How does Aetrix verify that MC34923EGR2 is sourced from the original manufacturer or authorized distributors?
All MC34923EGR2 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 MC34923EGR2 meets industry standards.
7.What is the process for return or replacement of MC34923EGR2?
All MC34923EGR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34923EGR2, 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 MC34923EGR2 part is unused and in its original packaging.
Return procedure for MC34923EGR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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