Toshiba Semiconductor and Storage TB67S265FTG,EL

Overview

TB67S265FTG from Toshiba Electronic Devices & Storage Corporation is an 8-bit serial-controlled, two-phase bipolar stepping motor driver IC using BiCD process silicon monolithic technology. It delivers PWM chopper constant-current drive up to 50 V and 2.0 A per channel, supports full/half-step operation, and integrates an internal VCC regulator for single-supply control - used in precision motion control systems such as industrial automation actuators and medical infusion pumps.

For engineers reviewing the TB67S265FTG datasheet, TB67S265FTG pinout, TB67S265FTG application, or TB67S265FTG equivalent, key selection considerations include its 48-pin WQFN package with exposed thermal pad, 16-step torque adjustment via TRQ1–TRQ4 pins, ADMD (Advanced Dynamic Mixed Decay) current control, built-in TSD/ISD/POR protection, and cascade-capable 3-line serial interface (SI/SCK/RCK).

Technical Context

The TB67S265FTG implements a dual H-bridge output stage with low on-resistance MOSFETs (0.8 Ω typical high+low side), driven by an 8-bit shift register and storage register pair. Its ADMD architecture dynamically selects between fast/slow decay modes based on real-time current error detection against the VREF-set threshold, enabling precise ripple control across 40–150 kHz chopper frequencies set externally via OSCM resistor/capacitor.

Motor current is regulated using external sense resistors (RS_A/RS_B) and internal VREF_A/VREF_B inputs, with current accuracy ±5% at 1.0 A. Protection logic includes thermal shutdown (150 °C trigger), overcurrent detection (3.0 A typical), and power-on reset - all independent of microcontroller supervision.

Key Specifications

Pinout & Package

Package: P-WQFN48-0707-0.50-003 - 7 mm × 7 mm, 0.5 mm pitch, thermally enhanced with exposed GND pad. Mounting requires soldering all four corner pins and the central pad to a solid GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar stepping motor driver applications.

Compared with STSPIN820 and DRV8825, the TB67S265FTG uniquely combines serial parameter configurability, hardware-based torque scaling, and cascade support - making it optimal for distributed multi-axis systems where firmware simplicity and thermal robustness are critical.

Availability

TB67S265FTG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump drive, automated test equipment (ATE), and 3D printer extruder axis applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TB67S265FTG 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

Toshiba Electronic Devices & Storage Corporation designs high-reliability analog and power ICs for industrial, automotive, and consumer applications, with emphasis on integration, thermal efficiency, and functional safety.

The TB67S265FTG belongs to Toshiba's stepper motor driver product line, engineered specifically for noise-sensitive, high-torque motion control systems requiring minimal external components and robust fault handling.

FAQ

What is the maximum continuous output current supported by the TB67S265FTG?

The TB67S265FTG supports a maximum output current of 2.0 A per channel under absolute maximum ratings. However, for reliable continuous operation, Toshiba recommends limiting IOUT to ≤1.4 A (70 % of max) to maintain junction temperature below 120 °C. Actual current capability depends on PCB thermal design, ambient temperature, and chopper frequency - verified using the 1.3 W power dissipation rating of the WQFN48 package.

How does the ADMD (Advanced Dynamic Mixed Decay) function work in the TB67S265FTG?

The ADMD function in the TB67S265FTG dynamically selects between fast and slow decay modes each chopper cycle based on real-time comparison of motor current against the VREF-derived threshold. When current falls below the ADMD threshold, it switches to slow decay to conserve energy; above threshold, it uses fast decay to suppress overshoot. This adaptive behavior minimizes current ripple without fixed decay timing - a key differentiator from conventional fixed-decay drivers like the DRV8825.

Can multiple TB67S265FTG ICs be connected in cascade, and how is it implemented?

Yes, the TB67S265FTG supports hardware cascade via three dedicated logic outputs: D_OUT (data out), C_OUT (clock out), and L_OUT (latch out). These connect directly to the SI, SCK, and RCK inputs of the next device, enabling daisy-chained serial programming of up to eight drivers using only three MCU GPIOs. The SCLR− and G− pins ensure synchronized initialization and data gating across the chain - eliminating need for individual chip-select lines.

What is the role of the OSCM pin, and how is the chopping frequency calculated?

The OSCM pin sets the internal oscillator frequency (f_OSCM) using an external RC network; f_chop = f_OSCM/16 defines the PWM chopper frequency. For example, with R = 3.6 kΩ and C = 270 pF, f_OSCM ≈ 1600 kHz → f_chop ≈ 100 kHz. Higher f_chop reduces current ripple but increases switching loss; Toshiba recommends 50–100 kHz for optimal balance. The TB67S265FTG datasheet provides exact formulas and tolerance guidance for RC selection.

Does the TB67S265FTG require an external VCC supply, or does it generate its own logic voltage?

The TB67S265FTG integrates an internal VCC regulator that generates a stable 5.0 V (±2.5 %) from the VM motor supply - eliminating the need for an external LDO. The VCC pin serves as both regulator output and monitor node; it can power external logic (e.g., MCU I/O) up to 5 mA. If external VCC is supplied, it must be within 4.75–5.25 V and disconnected from the internal regulator via appropriate decoupling.