Toshiba Semiconductor and Storage TB62218AFG,C8,EL

Overview

TB62218AFG,C8,EL from Toshiba is a BiCD monolithic two-phase bipolar stepping motor driver IC with PWM constant-current chopper control, rated for 40 V/2.0 A per phase, supporting two-phase, 1-2-phase and W1-2-phase excitation modes, and integrated thermal shutdown (TSD), overcurrent shutdown (ISD), and power-on reset (POR) protection - used in precision motion control for industrial automation actuators.

For engineers reviewing the TB62218AFG,C8,EL datasheet, TB62218AFG,C8,EL pinout, TB62218AFG,C8,EL application, or TB62218AFG,C8,EL equivalent, key selection considerations include its HSOP28 package, 100 kHz typical chopper frequency, ±1.0 V RS-pin voltage range, mixed-decay PWM operation, and dual H-bridge output architecture with internal voltage regulator enabling single VM supply operation.

Technical Context

The TB62218AFG,C8,EL implements a CR-oscillator-based PWM chopper with fixed 37.5% fast-decay timing in mixed-decay mode, using internal comparators to regulate current via external sense resistors (RS_A/RS_B) referenced to VM. Its dual H-bridge outputs drive A/B phase coils with independent PHASE_A/PHASE_B direction control and IN_A1/IN_A2/IN_B1/IN_B2 excitation sequencing.

It integrates three fault-protection circuits: TSD triggers at 150°C (typ.), ISD trips at ≥2.0 A per phase with 4-cycle masking, and POR holds outputs disabled until VM ≥8.0 V and VCC ≥4.75 V. The on-chip Vcc regulator derives logic supply from VM, eliminating need for separate low-voltage rail.

Key Specifications

Pinout & Package

Package: HSOP28-P-0450-0.8 (28-pin heat-sink exposed pad, 0.8 mm pitch, 10.0 × 7.0 mm body, 0.79 g typical weight).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN220TR and MP6500GQZ, the TB62218AFG,C8,EL offers unique analog Vref tuning per phase, hardware standby control, and W1-2-phase excitation - making it optimal for cost-sensitive, MCU-light industrial designs needing flexible current shaping and robust thermal management without SPI overhead.

Availability

TB62218AFG,C8,EL is available at Aetrix Electronics and suitable for industrial CNC positioning stages, medical infusion pump actuators, automated optical inspection systems, and lab automation robotic arms requiring stable component supply across long production lifecycles.

Supply support for TB62218AFG,C8,EL 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 semiconductor solutions for motor control, power management, and industrial interfaces, with emphasis on BiCD process integration for robust analog-digital hybrid ICs.

The TB62218AFG,C8,EL belongs to Toshiba's BiCD stepping motor driver product line, engineered specifically for cost-effective, thermally resilient open-loop motion control in factory automation and precision medical equipment.

FAQ

What is the maximum continuous output current rating for TB62218AFG,C8,EL?

The TB62218AFG,C8,EL has an absolute maximum output current rating of 2.0 A per phase, but the recommended continuous operating current is 1.4 A per phase under typical board thermal conditions (Ta = 25°C, 2-layer PCB). This derating ensures junction temperature remains below 120°C, avoiding thermal shutdown activation. The actual limit depends on heatsinking, ambient temperature, and duty cycle - verified via thermal simulation or IR measurement in final layout.

How does the TB62218AFG,C8,EL implement mixed-decay PWM control?

The TB62218AFG,C8,EL uses a fixed 37.5% fast-decay period within each chopper cycle, followed by slow-decay for the remaining 62.5%. This is controlled by an internal 16-cycle counter synchronized to the OSCM clock. When current reaches the Vref-set threshold, the device enters slow-decay; after 6 clocks, it switches to fast-decay to rapidly reduce current. This balance minimizes torque ripple while maintaining high average current - a key advantage over pure slow- or fast-decay modes in the TB62218AFG,C8,EL.

Can TB62218AFG,C8,EL operate with only a single power supply?

Yes, the TB62218AFG,C8,EL supports single-supply operation via its VM pin (10–38 V), which powers both the output H-bridges and the internal Vcc regulator. The regulator provides a stable 5.0 V ±2.5% supply for logic and gate drivers, eliminating need for external 5 V rail. A minimum 10 μF ceramic capacitor must be placed at the Vcc pin to ensure stability - confirmed in the TB62218AFG,C8,EL datasheet Section 21 (Example Application Circuits).

What protection features are built into TB62218AFG,C8,EL?

The TB62218AFG,C8,EL integrates three hardware-level protections: thermal shutdown (TSD) activates at 150°C (typ.) to disable outputs until cooled and reset; overcurrent shutdown (ISD) detects ≥2.0 A per phase with 4-cycle noise masking; and power-on reset (POR) holds outputs off until VM ≥8.0 V and Vcc ≥4.75 V. All operate independently of firmware - critical for fail-safe operation in the TB62218AFG,C8,EL's target industrial and medical applications.

How is current regulation set on TB62218AFG,C8,EL?

Current regulation on the TB62218AFG,C8,EL is set per phase using external sense resistors (RS_A, RS_B) and analog reference voltages (Vref_A, Vref_B). The relationship is IOUT = (Vref / 5) / RRS, where Vref decay rate is 1/5.0 (typ.). For example, applying 3.0 V to Vref_A with a 0.75 Ω sense resistor yields 0.8 A peak current. Vref inputs draw <1 μA, enabling direct connection to DACs or precision potentiometers - a defining feature of the TB62218AFG,C8,EL's analog control architecture.