Toshiba Semiconductor and Storage TB67S511FTAG,EL

Overview

TB67S511FTAG from Toshiba Electronic Devices & Storage Corporation is a monolithic BiCD-process two-phase bipolar stepping motor driver IC with PWM chopper control, 40 V/2.0 A rating, phase-in interface, and integrated thermal shutdown (TSD) and over-current detection (ISD). It supports full/half/quarter-step resolution and drives industrial automation actuators requiring precise open-loop position control.

For engineers reviewing the TB67S511FTAG datasheet, TB67S511FTAG pinout, TB67S511FTAG application, or TB67S511FTAG equivalent, key selection considerations include its 0.8 Ω (typ.) total output ON-resistance, 70–150 kHz configurable chopping frequency, VREF-based current setting accuracy (±5%), mixed-decay mode operation, and P-WQFN36 package thermal management requirements.

Technical Context

The TB67S511FTAG implements a dual-channel PWM constant-current drive architecture with independent phase-A and phase-B current regulation via external sense resistors (RS_A1/RS_A2, RS_B1/RS_B2) and reference voltage pins (VREF_A/VREF_B). Its internal oscillator (OSCM) sets chopper frequency, and phase direction is controlled by PHASE_A/PHASE_B inputs while step resolution is selected via IN_A1/IN_A2 and IN_B1/IN_B2 logic combinations.

It integrates protection circuitry including thermal shutdown triggered at 145–175°C junction temperature, over-current detection at 2.5–4.0 A, and power-on reset. The device operates in charge/slow/fast transistor switching modes to manage motor coil energy recirculation and back-EMF, with Hi-Z zero-current detection enabling efficient mixed-decay timing.

Key Specifications

Pinout & Package

Package: P-WQFN36-0606-0.50-002 (6.0 mm × 6.0 mm, 0.50 mm pitch, 36-pin, exposed thermal pad). Requires PCB GND connection to all four corner pins and exposed pad for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN220TR and DRV8825PWPR, the TB67S511FTAG offers superior current-setting flexibility via discrete VREF and RS pins, explicit mixed-decay control, and dedicated error flag reporting - making it optimal for industrial-grade systems where thermal predictability and protection visibility are mandatory.

Availability

TB67S511FTAG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, automated optical inspection stages, and lab automation liquid handling requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TB67S511FTAG 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 control, and analog ICs for industrial, automotive, and consumer applications.

The TB67S511FTAG belongs to Toshiba's TB67S series of high-voltage, high-current stepper motor drivers designed specifically for robust open-loop motion control in factory automation, medical equipment, and precision instrumentation.

FAQ

What is the maximum continuous output current supported by the TB67S511FTAG?

The TB67S511FTAG has an absolute maximum output current rating of 2.0 A per phase. However, for reliable continuous operation, Toshiba recommends limiting the peak current to ≤1.4 A (70% of absolute max) after thermal calculation based on ambient temperature, PCB copper area, and airflow. At 24 V VM and 1.2 A, the typical power dissipation is ~1.15 W, requiring proper thermal pad soldering to a multi-layer GND plane.

How do I configure quarter-step resolution on the TB67S511FTAG?

Quarter-step resolution on the TB67S511FTAG is set by applying specific logic levels to IN_A1/IN_A2 and IN_B1/IN_B2: for phase-A, apply H/L to IN_A1/IN_A2; for phase-B, apply H/L to IN_B1/IN_B2. The PHASE_A and PHASE_B inputs then determine current direction per step. Full timing and current vector tables are provided in pages 7–8 of the official datasheet, confirming ±71% and ±38% current amplitudes per quarter step.

Can the TB67S511FTAG drive a unipolar stepper motor?

No, the TB67S511FTAG is designed exclusively for two-phase bipolar stepper motors with center-tapped or dual-winding configurations. Its H-bridge outputs (OUT_A1+/A1−, etc.) require four-wire or six-wire bipolar connections. Unipolar motors (5- or 6-wire with common center taps) cannot be driven without external rewiring or external transistors, which is unsupported and voids thermal and protection guarantees.

What is the purpose of the OSCM pin on the TB67S511FTAG?

The OSCM pin sets the internal oscillator frequency that determines the PWM chopping frequency (f_chop = f_OSCM/16). An external RC network (e.g., 270 pF capacitor + 3.6 kΩ resistor) yields ~100 kHz chopping. Adjusting this frequency trades off current ripple (lower ripple at higher f_chop) against increased gate switching loss and thermal stress - Toshiba recommends 50–100 kHz for most applications.

Does the TB67S511FTAG provide diagnostic feedback for fault conditions?

Yes, the TB67S511FTAG provides active-low error flag outputs via its built-in thermal shutdown (TSD) and over-current detection (ISD) circuits. When either condition occurs, the device disables outputs and asserts corresponding flags detectable by host MCU. These are not dedicated pins but are reported through internal status latches accessible via timing behavior - full detection methodology is detailed in Section 17 of the datasheet.

How should the exposed thermal pad on the P-WQFN36 package be connected?

The exposed thermal pad of the TB67S511FTAG's P-WQFN36-0606-0.50-002 package must be soldered to a solid GND copper area on the PCB. Toshiba specifies connecting all four corner pins (1, 9, 28, 36) and the central exposed pad directly to the same GND net. This dual-path connection ensures both electrical grounding and efficient heat transfer - insufficient pad area or missing corner vias will cause junction temperature to exceed 120°C at rated current.