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Diodes Incorporated ZXBM1021JB20TC
- Part No.:
- ZXBM1021JB20TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 20-UFQFN Exposed Pad
- Datasheet:
-
ZXBM1021JB20TC.pdf
- Description:
- IC MOTOR CTRLR PAR U-QFN4040-20
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
ZXBM1021JB20TC from Diodes Incorporated is a single-phase BLDC motor pre-driver IC designed for variable-speed fan and blower control, featuring integrated Hall amplifier, programmable overcurrent protection (via Sense/SetTh), rotor lock detection with auto-restart, soft-start timing (CLCK pin), and dual-mode speed control (PWMSPD/SPD). It drives external N-channel MOSFET half-bridges (Ph1Hi/Ph2Hi open-collector; Ph1Lo/Ph2Lo Darlington emitter-follower) in 6.8–18V systems for cooling applications.
For engineers reviewing the ZXBM1021JB20TC datasheet, ZXBM1021JB20TC pinout, ZXBM1021JB20TC application, or ZXBM1021JB20TC equivalent, key selection criteria include Hall bias voltage (1.75V), ThRef output (5V), FG tachometer frequency generation, CLCK-based lock-detect timing, and dual-package compatibility (U-QFN4040-20/QSOP-20).
Technical Context
The ZXBM1021JB20TC implements a Hall-effect commutation controller with analog current monitoring: the Sense pin receives voltage from an external shunt resistor, compared against SetTh voltage derived from SetThRef (ThRef − 0.1V typical); overcurrent triggers shutdown. Its FG output provides a buffered, open-collector tachometer signal synchronized to magnetic pole transitions.
Speed regulation operates in two independent modes: DC voltage control (SPD pin: 1–3V = 100%–0% duty) or PWM integration (PWMSPD + CSPD capacitor), both modulating low-side drive duty at 18–25 kHz. Rotor lock detection uses CLCK capacitor discharge timing (tLCKDET ≈ 400 ms, tOFF = 3 s with 0.47 µF) and forces soft-start restart upon recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 6.8 V to 18 V operating range; supports fan systems powered from 12 V rails with margin for transients. |
| Operating Temperature | −40 °C to +110 °C junction range; qualified for industrial and computing thermal environments. |
| Hall Bias Output | 1.75 V typical (HBIAS pin); directly powers unbuffered 4-pin Hall sensors without external regulator. |
| Reference Voltage | 5.0 V ±0.15 V (ThRef pin); supplies precision divider networks for SMIN and SetThRef with ≤10 mA sourcing capability. |
| PWM Frequency | 18–25 kHz (typical); high enough to avoid audible noise in fan applications while enabling efficient MOSFET switching. |
| FG Output Type | Open-collector buffered tachometer; requires external pull-up; outputs logic-level pulses at motor rotation frequency. |
| Soft-Start Time | 3 s typical (CLCK = 0.47 µF); prevents inrush current by ramping current limit and drive duty gradually. |
| Overcurrent Threshold | Programmable via SetTh voltage; compares Sense pin voltage against SetTh to disable outputs if exceeded. |
Pinout & Package
The ZXBM1021JB20TC is available in two RoHS-compliant packages: thermally enhanced U-QFN4040-20 (4.0 mm × 4.0 mm, 0.5 mm pitch, exposed thermal pad) and industry-standard QSOP-20 (0.394" wide, 1.27 mm pitch). Both packages support identical pin functions with minor pin-order differences.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | 6.8–18 V supply for internal circuitry and high-side drivers; decoupling required near pin. |
| H+ / H− | Differential Hall sensor inputs | Accepts raw Hall element output; determines phase commutation direction based on polarity crossing. |
| Ph1Hi / Ph2Hi | High-side gate drive outputs | 50 mA open-collector outputs; require external pull-up resistors to drive N-MOSFET gates. |
| Ph1Lo / Ph2Lo | Low-side gate drive outputs | 100 mA source/sink Darlington outputs; directly drive N-MOSFET sources or bipolar bases. |
| Sense / SetTh | Current monitor interface | Sense pin reads shunt voltage; SetTh sets threshold-enables precise, adjustable overcurrent protection. |
| FG | Tachometer signal output | Open-collector frequency generator; outputs one pulse per Hall transition-used for RPM feedback. |
| CLCK | Timing capacitor node | Controls soft-start duration, rotor lock detection window (tLCKDET), and auto-restart delay (tOFF). |
| SPD / PWMSPD | Speed command inputs | SPD accepts 1–3 V DC; PWMSPD accepts 0–100% duty TTL signal-both modulate low-side PWM duty ratio. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall amplifier | Direct interface to unbuffered 4-pin Hall sensors with 1.75 V HBIAS bias and ±12 mV hysteresis for noise immunity. |
| Dual speed control mode | Hardware-selectable DC voltage (SPD) or PWM-integrated (PWMSPD+CSPD) input-no firmware required. |
| Rotor lock protection | Automatic shutdown after 400 ms stall detection (CLCK-based), followed by 3 s off-time and soft-start retry. |
| Programmable minimum speed | SMIN pin clamps SPD voltage using ThRef-derived divider-prevents motor stoppage under light load. |
| Current-controlled drive | Sense/SetTh architecture enables precise motor winding current limiting independent of supply voltage drift. |
| Thermally optimized packaging | U-QFN4040-20 offers 4× lower θJA than QSOP-20-critical for high-power fan driver PCBs with limited airflow. |
Applications
| Server Cooling Fans | Home Appliance Blowers |
|---|---|
|
Use Scenario: High-reliability 12 V fans in 1U/2U server chassis requiring continuous operation and RPM telemetry. IC Role / Device Role / Timing Role: Pre-driver controlling external MOSFET half-bridge; FG pin feeds tachometer signal to BMC for closed-loop thermal management. Use Value: Rotor lock detection prevents catastrophic failure during dust-clogged operation; soft-start extends bearing life by limiting mechanical stress at startup. |
Use Scenario: Variable-speed blower in HVAC duct systems or range hoods, controlled by microcontroller DAC or PWM output. IC Role / Device Role / Timing Role: Motor controller translating DC voltage or PWM commands into commutated gate drives; CLCK sets 3 s lock-off time for safety compliance. Use Value: Dual-mode speed input allows OEMs to reuse same BOM across models with different MCU interfaces-reducing qualification effort. |
| Industrial Extraction Fans | Hand-Held Power Tools |
|
Use Scenario: Dust-laden industrial exhaust fans operating continuously in harsh ambient conditions (−25 °C to +70 °C). IC Role / Device Role / Timing Role: Robust pre-driver with −40 °C to +110 °C junction rating; Sense/SetTh ensures consistent torque despite temperature-induced shunt drift. Use Value: Programmable overcurrent threshold protects motors from winding damage during filter clogging-eliminates need for external current-sense ICs. |
Use Scenario: Compact cordless drill or angle grinder requiring fast-response speed control and stall protection. IC Role / Device Role / Timing Role: Commutation controller interfacing to Hall sensor and discrete MOSFETs; FG output enables electronic clutch and battery load monitoring. Use Value: 18–25 kHz PWM frequency avoids audible whine while maintaining efficiency-critical for user experience in consumer tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC pre-driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MC33035 | Legacy 28-pin DIP/SOIC; no integrated Hall amplifier-requires external differential receiver; fixed 16 kHz PWM. | Lacks FG output and rotor lock auto-restart; used in cost-sensitive industrial fans where diagnostics are secondary. | Select when legacy footprint compatibility is mandatory and Hall sensor buffering is already implemented externally. |
| Texas Instruments DRV10983 | Monolithic 3-phase BLDC driver with integrated power MOSFETs; no external half-bridge support; SPI-configurable. | Targets smaller fans (<5 W); unsuitable for high-current blowers requiring discrete FETs and thermal flexibility. | Choose for space-constrained designs needing full integration-but not for >10 W systems requiring discrete FET thermal management. |
Compared with MC33035 and DRV10983, the ZXBM1021JB20TC uniquely balances external FET control flexibility, Hall sensor integration, and diagnostic features (FG, lock detect, soft-start) in a compact 20-pin package-making it optimal for mid-power industrial and computing fans where reliability and serviceability matter.
Availability
ZXBM1021JB20TC is available at Aetrix Electronics and suitable for server cooling fans, home appliance blowers, and industrial extraction systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ZXBM1021JB20TC 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in power management, signal integrity, and motor control solutions with IATF 16949-certified facilities.
The ZXBM1021 belongs to Diodes' motor control pre-driver product line, engineered specifically for cost-effective, high-reliability variable-speed BLDC fan and blower systems in computing, industrial, and consumer applications.
FAQ
What is the function of the CLCK pin and how does it affect motor behavior?
The CLCK pin connects to an external capacitor that sets three critical timing parameters: soft-start duration (tSS ≈ 3 s), rotor lock detection window (tLCKDET ≈ 400 ms), and auto-restart delay (tOFF = 3 s). During normal operation, Hall transitions discharge the CLCK capacitor; absence of transitions triggers lock detection. This single pin enables coordinated startup, fault response, and recovery without software intervention.
Can the ZXBM1021JB20TC drive both N-channel and P-channel MOSFETs in the high-side position?
No-the Ph1Hi and Ph2Hi outputs are open-collector, rated for 50 mA sink only, and lack internal pull-up or level-shifting. They are designed exclusively for driving N-channel MOSFET gates referenced to VCC, requiring external pull-up resistors. P-channel high-side drive is not supported due to missing charge pump or floating rail capability.
How is the FG (Frequency Generator) output used for RPM measurement?
The FG pin delivers an open-collector square wave whose frequency equals the motor's electrical rotation rate (e.g., 2 pulses per mechanical revolution for 2-pole motors). An external 10 kΩ pull-up to VCC converts it to a logic-compatible signal. System microcontrollers count FG edges over time to compute real-time RPM-enabling closed-loop speed regulation and fault detection.
What design considerations apply when using the SPD and SMIN pins together?
When SMIN is active (voltage <3 V), it clamps the effective SPD control voltage to prevent motor stoppage. To avoid interaction, place a ≥10 kΩ series resistor between the SPD source and the SPD pin. This isolates SMIN's voltage divider from loading the SPD source, ensuring predictable minimum speed setting without distorting the main speed command.
ZXBM1021JB20TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 20-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (2)
- Interface:
- PWM
- Technology:
- -
- Step Resolution:
- -
- Applications:
- Fan Controller
- Current - Output:
- -
- Voltage - Supply:
- 6.8V ~ 18V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN4040-20
ZXBM1021JB20TC FAQ
1.How can I place an order for ZXBM1021JB20TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXBM1021JB20TC 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 ZXBM1021JB20TC reliable?
The price and inventory of ZXBM1021JB20TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXBM1021JB20TC is usually 5 days.
3.What payment methods are accepted for ZXBM1021JB20TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXBM1021JB20TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXBM1021JB20TC?
ZXBM1021JB20TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXBM1021JB20TC 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 ZXBM1021JB20TC?
For technical support, including ZXBM1021JB20TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXBM1021JB20TC requirements.
6.How does Aetrix verify that ZXBM1021JB20TC is sourced from the original manufacturer or authorized distributors?
All ZXBM1021JB20TC 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 ZXBM1021JB20TC meets industry standards.
7.What is the process for return or replacement of ZXBM1021JB20TC?
All ZXBM1021JB20TC units undergo pre-shipment inspection (PSI). If there is an issue with ZXBM1021JB20TC, 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 ZXBM1021JB20TC part is unused and in its original packaging.
Return procedure for ZXBM1021JB20TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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