Toshiba Releases H-bridge Driver for Brushed DC Motors with Current Monitoring Function

Toshiba Releases H-bridge Driver for Brushed DC Motors with Current Monitoring Function

Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched 1-channel H-bridge drivers[1] “TB67H453FNG and TB67H453FTG” with a current monitoring function for brushed DC motor control. The new products feature a motor output voltage rating of 50V and a motor output current rating of 3.5A. The packages are “TB67H453FNG” with HTSSOP16 and “TB67H453FTG” with VQFN16, both featuring an exposed thermal pad for enhanced heat dissipation.

In recent years, a wide variety of motors have been used in consumer equipment, from large, high-output, high-torque motors to small, low-output, power-saving motors. A common requirement for these motors is improved efficiency through control. Previously, H-bridge drivers have monitored the current flowing through the load and have fed back to the control inside the H-bridge driver for efficient motor control. To further enhance efficiency, the new products integrate a current monitoring function that feeds back a signal corresponding to the load current to CPUs and microcontrollers. This enables CPU and microcontrollers to monitor the current flowing through the load in real time. By optimizing the control signals sent to the H-bridge driver according to the load and driving conditions, motor control can be more efficient.

Additionally, the new H-bridge drivers feature a half-bridge independent control mode, enabling one H-bridge to be controlled as two half-bridges. This functionality extends their application beyond motors to include devices such as smart meters, in addition to brushed DC motors.

Figure 1. System block diagram of Toshiba existing product and new product
Figure 1. System block diagram of Toshiba existing product and new product

Note:
[1] It is called because the shape of the output circuit resembles the letter "H"

Features

  1. A signal corresponding to the load current can be output externally, enabling real-time feedback
  2. Wide operating range: Motor power supply (VM: 4.5V to 44V)
  3. IC current consumption in SLEEP mode: Maximum 1μA (Tj=25°C, VM=24V)

Features Explanation

1. A signal corresponding to the load current can be output externally, enabling real-time feedback

Figure 2. Current monitoring function block diagram<sup>[2]</sup>
Figure 2. Current monitoring function block diagram[2]

The product is equipped with a current monitoring function that folds back the current flowing through MOSFET inside at a fixed ratio and outputs it to the outside. By outputting a current proportional to the load current from ISENSE pin and externally attaching a current-voltage converter resistor (RISENSE), a voltage corresponding to the load current can be output to a microcontroller. This enables more efficient control of brushed DC motors. For example, feedback control is applied from a microcontroller to an H-bridge driver in real-time in response to load-related changes.

2. Wide operating range: Motor power supply (VM: 4.5V to 44V)

The motor power supply (VM) range of new products support from 4.5V to 44V. This enables a wide range of applications from battery-powered to commercial power source-powered applications for consumer/industrial equipment.

3. IC current consumption in SLEEP mode: Maximum 1μA (Tj=25°C, VM=24V)

By suppressing internal current consumption when SLEEP mode is set, standby power is reduced, contributing to longer operating times in battery-powered applications.

Note:
[2] The equivalent circuit diagrams may be simplified for explanatory purposes.

Applications

  • Consumer equipment (cordless cleaners, cleaning robots, etc.)
  • Industrial equipment (printers, scanners, financial terminals, smart meters, etc.)

Main Specifications

Product name

TB67H453FNG

TB67H453FTG

Absolute Maximum Ratings

(Ta=25°C)

Motor power supply VM (V)

50

Motor output current Iout (A)

3.5

Operating ranges

(Ta=-40 to 125°C)

Motor power supply VM (V)

4.5 to 44

Motor output current Iout (A)

0 to 3.5

Motor output pin High side

MOSFET on resistance

Ron(H) (Ω)

Iout=1A, Tj=25°C

0.3

Motor output pin Low side

MOSFET on resistance

Ron(L) (Ω)

Iout=-1A, Tj=25°C

0.3

Power dissipation

IM1 Max (μA)

SLEEP mode

(Tj=25°C, VM=24V)

1

Capacitor for charge pump

Not required

Error detections

Over current shutdown

/Thermal shutdown

/Under voltage lockout

* With detection signal output

Package

Name

P-HTSSOP16-0505-

0.65-002

P-VQFN16-0303-

0.50-001

Size Typ. (mm)

5.0×6.4

3.0×3.0 (Lead less)

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