Toshiba Semiconductor and Storage TB67H400AFTG,EL

Overview

TB67H400AFTG from Toshiba Electronic Devices & Storage Corporation is a PWM chopper-type dual-channel brushed DC motor driver IC fabricated in BiCD silicon monolithic process. It delivers 4.0 A per channel (Small mode) or 8.0 A combined (Large mode), features integrated thermal shutdown (TSD), over-current detection (ISD), and programmable chopping frequency via external OSCM components - used in industrial automation actuators, robotic joint controllers, and precision lab equipment motion stages.

For engineers reviewing the TB67H400AFTG datasheet, TB67H400AFTG pinout, TB67H400AFTG application, or TB67H400AFTG equivalent, key selection considerations include dual/mode-selectable H-bridge operation, 0.49 Ω typical on-resistance (HS+LS), mixed-decay current control with fixed 37.5% slow/fast timing, and VREF-based peak current setting with ±5% accuracy at 1.5 A.

Technical Context

The TB67H400AFTG implements a dual independent H-bridge architecture with configurable parallel operation (HBMODE pin) enabling either two 4.0 A motors or one 8.0 A motor. Its internal oscillator drives a 16-clock chopping cycle (fchop = fOSCM/16), supporting 40–150 kHz PWM frequencies with external ROSC/COSC tuning.

Current regulation uses analog sensing via RSA/RSB pins and a fixed 37.5% mixed-decay timing window, where charge/slow/fast modes are sequenced by internal logic synchronized to OSCM. Protection includes TSD (145–175 °C trip), ISD (4.1–5.7 A threshold), and power-on reset (VMR = 7.0–9.0 V).

Key Specifications

Pinout & Package

Package: P-WQFN48-0707-0.50-003 (7.0 mm × 7.0 mm, 0.50 mm pitch, exposed thermal pad). Requires PCB ground connection to corner and exposed pad for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar brushed DC motor driver applications.

Compared with DRV8876PWPR and MP6532GQZ, the TB67H400AFTG uniquely supports reconfigurable dual/parallel H-bridge topology via HBMODE, offers externally tunable chopping frequency, and provides dual independent current regulation with ±5% accuracy - making it optimal for space-constrained, multi-motor industrial motion systems requiring hardware-level adaptability.

Availability

TB67H400AFTG is available at Aetrix Electronics and suitable for industrial robotics, lab automation, and medical device motion control requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TB67H400AFTG 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 expertise in BiCD process technology and motor control integration.

The TB67H400AFTG belongs to Toshiba's TB67H series of PWM chopper motor drivers, engineered specifically for compact, thermally efficient brushed DC motor control in space- and reliability-constrained embedded systems.

FAQ

What is the maximum continuous output current for TB67H400AFTG in Small mode?

The TB67H400AFTG supports 4.0 A per channel in Small mode (HBMODE = L), but Toshiba recommends limiting operation to ≤2.8 A (70% of absolute max) under real thermal conditions. Derating is required above 25 °C ambient - for example, at 60 °C Ta, max usable current drops to ~1.8 A based on PD-Ta derating curves in the datasheet. The TB67H400AFTG must be mounted on a 4-layer PCB with thermal vias to the ground plane to sustain rated performance.

How does the TB67H400AFTG implement current regulation without an external op-amp?

The TB67H400AFTG integrates a precision current-sense comparator and reference generator. It measures voltage across external sense resistors (RSA/RSB) and compares it to a scaled VREF input (gain = 1/5.0 typ.), triggering mixed-decay PWM cycles to hold peak current within ±5% accuracy at 1.5 A. This eliminates need for external amplifiers or DACs - the TB67H400AFTG handles full analog current loop internally.

Can TB67H400AFTG drive a single motor in Large mode while using only Channel A inputs?

Yes - when HBMODE = H, the TB67H400AFTG operates in Large mode: INA1/INA2/PWMA become INL1/INL2/PWML, controlling the combined 8.0 A output, while INB1/INB2/PWMB are ignored. Toshiba explicitly states that INBx/PWMB should be held low in this configuration. The TB67H400AFTG internally parallels both H-bridges, requiring physical connection of OUTA+/OUTB+, OUTA−/OUTB−, and RSA/RSB on the PCB.

What is the purpose of the TBLKAB pin on TB67H400AFTG, and how does it affect motor performance?

The TBLKAB pin configures digital blanking time (DtBLK) to suppress false over-current detection during H-bridge switching transients. At TBLKAB = L, DtBLK = 4 OSCM clocks (~3.6 µs at 1.12 MHz); at H, it extends to 6 clocks (~5.4 µs). This prevents nuisance ISD trips when driving inductive loads like brushed DC motors - the TB67H400AFTG maintains stable current regulation without sacrificing responsiveness during direction changes.

Does TB67H400AFTG require external components for basic operation, and which ones are mandatory?

Yes - the TB67H400AFTG requires three mandatory external components: (1) VREF-setting resistor network (to define peak current), (2) OSCM RC network (to set chopping frequency), and (3) low-inductance current-sense resistors (RSA/RSB). Optional but strongly recommended: input decoupling capacitors (10 µF + 0.1 µF near VM/VCC), thermal vias under the exposed pad, and RC snubbers on OUTx pins for EMI suppression. All NC pins on the TB67H400AFTG must remain unconnected.