Toshiba Semiconductor and Storage TB62208FTG,8,EL

Overview

TB62208FTG from Toshiba is a BiCD monolithic two-phase bipolar stepping motor driver IC with PWM constant-current chopper control, rated for 40 V motor supply and 1.8 A per phase output current. It integrates thermal shutdown (TSD), overcurrent shutdown (ISD), and power-on reset (POR) protection, and supports 2-phase and 1-2-phase excitation modes for precision open-loop motion control in industrial automation actuators.

For engineers reviewing the TB62208FTG datasheet, TB62208FTG pinout, TB62208FTG application, or TB62208FTG equivalent, key selection considerations include its QFN48 package thermal performance, mixed-decay PWM current regulation, Vref-based current tuning (I_OUT = V_ref/5/R_RS), and dual-phase enable/standby control logic for low-power idle states.

Technical Context

The TB62208FTG implements a dual-H-bridge output stage using DMOS FETs fabricated in Toshiba's BiCD process, enabling 40 V/1.8 A operation with integrated pre-drivers and on-chip voltage regulation for single VM supply operation. Its CR oscillator generates a programmable chopper frequency (40–150 kHz) with 37.5% fast-decay / 62.5% slow-decay mixed decay mode for stable current waveform control.

Control logic accepts PHASE_A/PHASE_B direction inputs and ENABLE_A/ENABLE_B per-phase enables, with STANDBY pin disabling OSCM and outputs to reduce quiescent current to 2 mA. Protection includes TSD (trip at 140–170°C), ISD (2.0–4.0 A trip threshold per phase), and POR for VM/VCC, all requiring STANDBY toggling to recover.

Key Specifications

Pinout & Package

Package: QFN48-P-0707-0.50 (7.0 mm × 7.0 mm, 0.50 mm pitch, 5.4 mm × 5.4 mm backside heatsink). Exposed thermal pad must be soldered to PCB ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STK672-440A-E and DRV8825PWPR, the TB62208FTG offers simpler single-VM supply operation and integrated protection recovery logic but lacks microstepping and has lower voltage headroom - optimal for cost-sensitive, medium-power 2-phase open-loop motion where layout simplicity and thermal robustness are prioritized.

Availability

TB62208FTG is available at Aetrix Electronics and suitable for industrial CNC positioning stages, medical infusion pump actuators, automated optical inspection systems, and PCB router Z-axis drives requiring stable component supply and long-term production continuity.

Supply support for TB62208FTG 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 motor control, power management, and interface solutions.

The TB62208FTG belongs to Toshiba's BiCD stepping motor driver family, engineered specifically for compact, thermally efficient open-loop motion control in space-constrained industrial equipment where single-supply operation and integrated protection are essential.

FAQ

What is the maximum continuous output current per phase for TB62208FTG in a standard PCB layout?

The TB62208FTG is rated for 1.8 A peak per phase, but Toshiba specifies a practical continuous limit of ≤1.0 A per phase under typical ambient conditions (Ta ≤ 85°C) to maintain junction temperature below 120°C. This assumes use of the recommended QFN48 thermal pad layout on a 4-layer board with ≥2 oz copper and adequate ground plane area. Exceeding 1.0 A requires active cooling or derating per the PD–Ta curve (38°C/W).

How does the TB62208FTG implement current regulation without external op-amps or DACs?

The TB62208FTG uses an internal PWM chopper with a CR oscillator (1600 kHz) and mixed-decay control to regulate coil current. Current is set by the external sense resistor (Rs_A1/A2, Rs_B1/B2) and Vref voltage: I_OUT = V_ref/5/R_RS. The 1/5 decay rate is fixed, so adjusting Vref (3.0–5.0 V) or Rs value directly tunes the target current - eliminating need for external amplification or digital interfaces.

Can TB62208FTG drive a unipolar stepper motor?

No, the TB62208FTG is designed exclusively for two-phase bipolar stepper motors with center-tapped or dual-winding configurations. Its H-bridge outputs (OUT_A1/A2, OUT_B1/B2) require four-wire bipolar connections and cannot interface with unipolar 5- or 6-wire motors. Attempting unipolar connection risks incorrect current paths, missing torque, or device damage due to improper biasing.

What happens to TB62208FTG outputs during thermal shutdown (TSD), and how is normal operation restored?

When junction temperature exceeds 155°C (typical), the TB62208FTG's TSD circuit disables all H-bridge outputs while retaining their last state - no current flows, but the driver remains latched in fault mode. Recovery requires toggling the STANDBY pin: drive it Low then High. Simply cooling the device is insufficient; the STANDBY transition resets internal logic and re-enables PWM control, ensuring safe restart after thermal stress.

Is the TB62208FTG compatible with 3.3 V logic control signals?

Yes, the TB62208FTG accepts 3.3 V logic levels on ENABLE_A/B, STANDBY, and PHASE_A/B pins. Its VIN(H) minimum is 2.0 V and VIN(L) maximum is 1.0 V, providing 0.3 V noise margin at 3.3 V. No level-shifting is needed when interfacing with 3.3 V microcontrollers or FPGAs, though pull-up/pull-down resistors are recommended on unused control lines to prevent floating states.