MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

17517

9

SYSTEM/APPLICATION INFORMATION

INTRODUCTION

The 17517 is a triple totem-pole output H-Bridge power IC

designed to drive small dc motors used in portable electronics.

The 17517 can operate efficiently with supply voltages as low

as 2.0 V to as high as 6.8 V, and provide continuos motor drive

currents of 1.0 A while handling peak currents up to 3.0 A. It is

easily interfaced to low cost MCUs via parallel 3.0 V- or 5.0 V-

compatible logic. The device can be pulse width modulated

(PWM-ed) at up to 200 kHz. The 17517 can drive two motors in

two directions one at a time; or it can drive one motor in two

directions and one solenoid with synchronous rectification of

freewheeling currents one at a time. Two-motor operation is

accomplished by hooking one motor between OUTA and

OUTB, and the other motor between OUTB and OUTC.

Motor + solenoid operation is accomplished by hooking a motor

between OUTA and OUTB and placing a solenoid between

OUTC and GND. Table 1, Truth Table, page 8, describes the

operating states versus the input conditions.

As shown in Figure 1, 17517 Simplified Internal Block

Diagram, page 2, the 17517 is a monolithic triple totem-pole

output bridge with built-in charge pump circuitry. Each of the six

of

≤ 0.6 Ω (guaranteed by design). The IC has an integrated

charge pump and level shifter (for gate drive voltages).

Additionally, the IC has a built-in shoot-through current

protection circuit and undervoltage lockout function. This IC has

four operating modes: Forward, Reverse, Brake, and Tri-Stated

(High Impedance).

FUNCTIONAL TERMINAL DESCRIPTION

OUTA, OUTB, and OUTC

These terminals provide the connection to the internal power

MOSFET triple-totem-pole H-bridge of the IC.

GND

Power and signal ground terminal.

This terminal provides the connection for the external

reservoir capacitor (output of the charge pump). Alternatively,

this terminal can also be used as an input to supply gate-drive

voltage from an external source via a series current-limiting

resistor.

supply gate drive for the internal power MOSFETs.

VM

The two VM terminals carry the main supply voltage and

current into the power sections of the IC. This supply then

becomes controlled and/or modulated by the IC as it delivers

the power to the load attached between OUTA and OUTB.

The VM terminals must be connected together on the printed

circuit board with as short as possible traces offering as low

impedance as possible between terminals.

IN1, IN1, EN1, and EN2

These terminals are input control terminals used to control

the outputs. These terminals are 3.0 V/5.0 V CMOS-compatible

inputs with hysteresis. These terminals work together to control

OUTA, OUTB, and OUTC (refer to Table 1, Truth Table).

C1L and C1H, C2L and C2H

These two pairs of terminals, the C1L and C1H and the C2L

and C2H, connect to the external bucket capacitors required by

the internal charge pump. The typical value for the bucket

capacitors is 0.1

µF.

This terminal carries the logic supply voltage and current into

If the supply voltage drops below the undervoltage threshold,

the output power stage switches to a tri-state condition. When

the supply voltage returns to a level that is above the threshold,

the power stage automatically resumes normal operation

according to the established condition of the input terminals.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com