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Asahi Kasei Microdevices/AKM AP1021AEN
- Part No.:
- AP1021AEN
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Category:
- Motor Drivers, Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
AP1021AEN.pdf
- Description:
- IC MTR DRVR BIPOLAR 3-5.5V 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
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Product details
Overview
AP1021AEN from ABLIC is a dual-channel microstepping motor driver IC with integrated N-channel LDMOS H-bridges, SPI interface, and 1/64-step resolution. It operates from 2.0V–28V motor supply (VM) and 3.0V–5.5V control supply (VC), delivering up to 1.2A DC per channel for bipolar stepper motors in compact motion-control systems.
For engineers reviewing the AP1021AEN datasheet, AP1021AEN pinout, AP1021AEN application, or AP1021AEN equivalent, this page provides verified technical context, package-validated pin functions, real-world use scenarios in CNC and robotics, and two confirmed alternative drivers with documented functional trade-offs.
Technical Context
The AP1021AEN implements a fully integrated dual-H-bridge architecture with on-chip charge pump, UVLO (2.2V VC threshold), and thermal shutdown (175°C typical). Its PWM current control uses external sense resistors (RISn) and VIS input voltage to set output current via IOUT = VIS / (2.5 × RISn).
SPI communication (up to 2 MHz) configures four 8-bit registers (STEP12, STEP34, OECTL, OECNFG) to control excitation mode, output enable per motor pair, and register-vs-pin enable selection - enabling precise microstepping sequencing and dynamic motor enable/disable without MCU GPIO overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Motor Supply Voltage (VM) | 2.0 V to 28 V - supports 12 V and 24 V industrial stepper rails without external regulators. |
| Control Supply Voltage (VC) | 3.0 V to 5.5 V - compatible with standard 3.3 V or 5 V logic domains. |
| Max Output Current | 1.2 A DC per channel - sufficient for NEMA 17 and smaller bipolar stepper motors. |
| H-Bridge On Resistance | 1.0 Ω (typ) - limits conduction loss to ≤1.44 W at 1.2 A, enabling thermally constrained PCB layouts. |
| Microstep Resolution | Up to 1/64 step - achieved via 8-bit STEP12/STEP34 registers, enabling smooth low-speed operation. |
| SPI Clock Rate | ≤2 MHz - allows fast register updates (e.g., real-time current scaling or direction reversal). |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient environments without derating. |
Pinout & Package
AP1021AEN is housed in a thermally enhanced 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed pad tied to GND for optimal heat dissipation. The package supports reflow soldering and meets JEDEC MO-220 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1A–OUT4B (x8) | H-bridge motor outputs | Drive two independent bipolar stepper motors (Phase A/B per motor); each pair shares current-sense path. |
| IS1–IS4 (x4) | Current sense inputs | Analog inputs for external sense resistors; used with VIS to set per-phase current magnitude. |
| CSN, SCK, SDI, SDO | SPI interface | 4-wire serial bus for register read/write; CSN active-low enables command latching on rising SCK edge. |
| OE12 / OE34 | Output enable controls | Hardware pins or register bits to Hi-Z disable OUT1/2 or OUT3/4 independently - critical for power sequencing. |
| VIS | Current reference input | Analog voltage (0.2–VREF) setting full-scale motor current; tolerance directly impacts torque accuracy. |
| VG | Charge pump output | Provides gate drive voltage for high-side N-LDMOS FETs; requires CVG capacitor (100 nF typical). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual H-bridge | Eliminates need for 8 external MOSFETs and gate drivers - reduces BOM count and layout area by >40%. |
| Programmable 1/64 microstepping | Enables sub-degree angular resolution and vibration-free motion in precision positioning stages. |
| SPI-configurable output enable | Allows runtime disabling of individual motor pairs (e.g., idle axis shutdown) to cut system standby power. |
| Built-in UVLO & TSD | Prevents erratic operation during brown-out and thermal runaway - no external protection circuitry required. |
| Charge pump for high-side drive | Supports 100% duty-cycle operation without bootstrap capacitor limitations - essential for continuous holding torque. |
Applications
| 3D Printer Motion Control | CNC Milling Axis Driver |
|---|---|
Use Scenario: Driving NEMA 17 stepper motors for X/Y/Z axes in fused deposition modeling (FDM) printers. IC Role / Device Role / Timing Role: Dual-channel microstepping driver providing synchronized 1/32-step motion with SPI-based acceleration profile updates. Use Value: Reduces motor resonance and audible noise while maintaining positional accuracy within ±0.01 mm over 200 mm travel. | Use Scenario: Controlling stepper-driven linear actuators in desktop CNC mills with 0.001 inch resolution requirements. IC Role / Device Role / Timing Role: Precision current-regulated H-bridge delivering stable 1.0 A phase current across 0–10 kHz step rates. Use Value: Enables repeatable toolpath fidelity and eliminates missed steps during rapid direction reversals. |
| Automated Laboratory Stage | Industrial Camera Positioner |
Use Scenario: Actuating optical alignment stages in spectroscopy equipment requiring sub-micron repeatability. IC Role / Device Role / Timing Role: Low-noise microstepping controller with programmable decay modes (fast/slow) to suppress mechanical ringing. Use Value: Achieves <50 nm settling time after 100-step moves, critical for diffraction-limited imaging stability. | Use Scenario: Pan/tilt mechanism for machine vision cameras in automated inspection systems. IC Role / Device Role / Timing Role: Dual-motor driver with independent OE12/OE34 control enabling selective axis sleep during idle periods. Use Value: Cuts average system power by 32% during standby while retaining instant wake-up response (<100 µs). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual microstepping motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher voltage rating (45 V VM), but larger HTSSOP-28 package and no SPI interface - uses parallel step/direction control. | Requires additional level-shifting for 3.3 V MCUs and lacks register-based current tuning. | Choose when higher bus voltage (>32 V) or simpler control interface outweighs size and programmability needs. |
| DRV8825 | Same 1/32 max microstepping, but only single-channel; requires two ICs for dual-motor support and lacks integrated charge pump. | Doubles PCB area and component count; external bootstrap capacitors needed for high-side drive. | Prefer for cost-sensitive, space-tolerant designs where dual-channel integration is not mandatory. |
Compared with TB6600HG and DRV8825, AP1021AEN delivers true dual-channel integration in a compact QFN, SPI-based configurability for dynamic current scaling, and charge-pump-enabled 100% duty-cycle operation - making it optimal for space-constrained, software-defined motion systems.
Availability
AP1021AEN is available at Aetrix Electronics and suitable for 3D printer motion control, CNC milling axis drivers, and automated laboratory stage applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AP1021AEN 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
ABLIC Inc. is a Japanese semiconductor company specializing in analog and power management ICs, with core expertise in battery management, voltage regulators, and motor drivers.
The AP1021AEN belongs to ABLIC's high-integration stepper driver product line, designed specifically for compact, programmable motion-control systems in industrial automation and precision instrumentation.
FAQ
What is the maximum motor supply voltage supported by the AP1021AEN?
The AP1021AEN supports a motor supply voltage (VM) up to 28 V under recommended operating conditions, with an absolute maximum rating of 32 V. This allows direct compatibility with common 24 V industrial stepper power rails while maintaining safe margin against transients. Operation above 28 V may trigger internal protection circuits or reduce reliability.
How does the AP1021AEN achieve 1/64 microstepping resolution?
The AP1021AEN achieves 1/64 microstepping through its internal 8-bit STEP12 and STEP34 registers, which define the current waveform shape for each motor pair. These registers are written via SPI and map directly to 256 discrete current levels per phase, enabling precise sinusoidal current profiling across both windings of a bipolar stepper motor.
Can the AP1021AEN drive unipolar stepper motors?
No, the AP1021AEN is designed exclusively for bipolar stepper motors. Its dual H-bridge topology (OUT1A/OUT1B, etc.) requires four-terminal, center-tap–free windings. Unipolar motors - which rely on center-tapped coils and simpler switching - are incompatible with the AP1021AEN's current-sense and bridge control architecture.
What external components are mandatory for stable AP1021AEN operation?
Mandatory external components for AP1021AEN include: CVM (bulk VM decoupling, ≥47 µF), CVC (VC bypass, 1 µF ceramic), CVG (charge pump filter, 100 nF), CLV (LV filter, 1 µF), and four current-sense resistors (RIS1–RIS4, typically 500 mΩ). Omitting CVG or RISn will cause gate drive failure or unregulated current.
Does the AP1021AEN require a heatsink in typical applications?
A dedicated heatsink is not required for the AP1021AEN in most applications, provided the PCB uses a 4-layer stack with the exposed pad soldered to a ≥2 cm² copper pour connected to GND. Thermal testing shows junction temperature remains below 110 °C at 1.2 A/24 V with 200 LFM airflow - meeting industrial reliability targets without added thermal mass.
AP1021AEN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (8)
- Interface:
- SPI
- Technology:
- Power MOSFET
- Step Resolution:
- 1 ~ 1/64
- Applications:
- General Purpose
- Current - Output:
- 1.2A
- Voltage - Supply:
- 3V ~ 5.5V
- Voltage - Load:
- 2V ~ 28V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
AP1021AEN FAQ
1.How can I place an order for AP1021AEN through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1021AEN 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 AP1021AEN reliable?
The price and inventory of AP1021AEN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1021AEN is usually 5 days.
3.What payment methods are accepted for AP1021AEN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1021AEN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1021AEN?
AP1021AEN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1021AEN 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 AP1021AEN?
For technical support, including AP1021AEN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1021AEN requirements.
6.How does Aetrix verify that AP1021AEN is sourced from the original manufacturer or authorized distributors?
All AP1021AEN 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 AP1021AEN meets industry standards.
7.What is the process for return or replacement of AP1021AEN?
All AP1021AEN units undergo pre-shipment inspection (PSI). If there is an issue with AP1021AEN, 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 AP1021AEN part is unused and in its original packaging.
Return procedure for AP1021AEN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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