Toshiba Semiconductor and Storage TB67S522FTAG,EL

Overview

TB67S522FTAG from Toshiba Electronic Devices & Storage Corporation is a PWM chopper-type two-phase bipolar stepping motor driver IC rated for 40 V and 2.8 A per channel, featuring integrated mixed-decay control, thermal shutdown (TSD), over-current detection (ISD), and a built-in VCC regulator enabling single-VM supply operation in precision motion control systems.

For engineers reviewing the TB67S522FTAG datasheet, TB67S522FTAG pinout, TB67S522FTAG application, or TB67S522FTAG equivalent, key selection considerations include its 36-pin WQFN package, support for full/half/quarter-step resolution via D_MODE1/D_MODE2, external OSCM frequency tuning, and dual-channel current sensing via RS_A1/RS_A2 and RS_B1/RS_B2 pins.

Technical Context

The TB67S522FTAG implements a two-channel H-bridge output stage with BiCD process low on-resistance (0.53 Ω typical, H+L), mixed-decay current control using internal chopping oscillator (fchop = fOSCM/16), and step-angle progression synchronized to CLK_IN rising edges. Its current regulation uses VREF_A/VREF_B bias inputs and external sense resistors (RS_A1/RS_A2, RS_B1/RS_B2) to set peak output current per phase.

Functional logic includes CW/CCW direction control, ENABLE-driven output enable/disable, RESET-initiated electrical angle initialization, and MO_OUT monitor pin for real-time angle tracking. The device integrates VMR detection, POR, and protection circuits-TSD (trip at 140–170 °C), ISD (4.0 A typical trip threshold), and noise-rejection blanking (300 ns typical).

Key Specifications

Pinout & Package

Package: P-WQFN36-0606-0.50-002 - 6 mm × 6 mm, 0.5 mm pitch, 36-pin wettable flank QFN with exposed thermal pad (0.14 g typical weight). Requires careful PCB layout: dedicated GND plane, short high-current traces (VM, OUT_Ax±, OUT_Bx±), and single-point grounding per datasheet layout guidance.

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 TB67S522FTAG uniquely combines analog OSCM frequency tuning, real-time MO_OUT angle monitoring, and hardware-selectable step resolution - making it optimal for compact, single-supply, analog-controlled stepper systems demanding predictable thermal behavior and minimal external components.

Availability

TB67S522FTAG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, automated optical inspection stages, and 3D printer extruder motion control requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TB67S522FTAG 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 is a Japanese semiconductor manufacturer specializing in power management, motor drivers, and analog ICs for industrial, automotive, and consumer applications.

The TB67S522FTAG belongs to Toshiba's TB67S series of bipolar stepper drivers, designed specifically for compact, thermally constrained motion control systems requiring high current density, integrated protection, and flexible microstepping without microcontroller overhead.

FAQ

What is the maximum continuous output current per channel for the TB67S522FTAG under typical operating conditions?

The TB67S522FTAG supports 1.5–2.5 A per channel under typical operating conditions (Ta = 0–85 °C, VM = 24 V), with 2.8 A specified as absolute maximum. Sustained 2.5 A operation requires adequate PCB thermal design - e.g., 4-layer board with 100 mm × 110 mm copper area and thermal pad soldering. At 25 °C ambient, power dissipation must be derated by 32.8 mW/°C above that point. Real-world current capability depends on heatsinking, airflow, and duty cycle - always verify junction temperature stays below 120 °C in final layout. The TB67S522FTAG datasheet specifies 2 A as a conservative thermal design target.

How does the TB67S522FTAG implement mixed-decay current control, and what is its practical benefit?

The TB67S522FTAG implements mixed-decay control by alternating between slow and fast decay phases within each chopper cycle - specifically, 37.5% of fchop time in fast decay and 62.5% in slow decay. This balances low current ripple (reducing motor vibration and acoustic noise) against excessive back-EMF voltage spikes during fast decay. The result is smoother low-speed operation and improved torque consistency across speed ranges. Unlike pure slow-decay drivers, this approach avoids current lag at higher frequencies; unlike pure fast-decay drivers, it prevents damaging voltage overshoot on the VM rail. The TB67S522FTAG's fixed 37.5% ratio is optimized for general-purpose bipolar stepper loads without requiring external tuning.

Can the TB67S522FTAG operate from a single power supply, and how is the logic voltage generated?

Yes, the TB67S522FTAG operates from a single VM supply (10–35 V typical) thanks to its integrated VCC voltage regulator. This internal regulator derives a stable ~5 V logic supply from the VM rail and powers all digital circuitry, including input buffers, step decoder, and protection logic. The VCC pin (25) is an output - it must not be driven externally. When VM is applied, VCC ramps up with built-in POR to ensure reliable startup. This eliminates the need for an external 5 V rail, reducing system component count and simplifying power sequencing. The TB67S522FTAG's single-supply capability is confirmed in Section 1 and Table 9.2 of its official datasheet.

What are the recommended layout practices for the TB67S522FTAG's high-current paths and thermal management?

Toshiba mandates strict PCB layout rules for the TB67S522FTAG: all GND connections must terminate at a single point on the solder mask; VM, OUT_Ax±, OUT_Bx±, and RS pins require wide, short copper traces to minimize inductance and voltage drop; and the exposed thermal pad must be fully soldered to a solid internal GND plane. A 4-layer board (100 mm × 110 mm × 1.6 mm) with 55 µm outer-layer copper is specified for 4.1 W dissipation. Avoid routing sensitive signals (CLK_IN, VREF_A/B) near high-current paths. Thermal vias under the pad (≥9×0.3 mm) are essential. These practices prevent oscillation, ground bounce, and thermal runaway - critical because incorrect layout can permanently damage the TB67S522FTAG, as noted in Section 3 of its datasheet.

How do the D_MODE1 and D_MODE2 pins configure step resolution, and what is required to change modes safely?

D_MODE1 and D_MODE2 are binary-encoded inputs that select full-step (L/H), half-step (H/L), quarter-step (H/H), or standby (L/L) modes. To change resolution safely, the datasheet requires asserting RESET (pin 3) LOW before updating D_MODE states - this resets the internal step angle counter to a known initial state (e.g., 45° offset in full-step mode) and prevents erratic motor behavior. After RESET deassertion, the new mode takes effect on the next CLK_IN edge. Failure to use RESET may cause missed steps or torque imbalance. The TB67S522FTAG's mode table (Section 6.4) explicitly states this sequence, and timing charts (Figure 6.6) confirm MO_OUT synchronization to RESET transitions.