34920 datasheet(7/29 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34920

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

Voltage Overshoot

External VCC Load Current from 0.01 to 0.500 A, tRISE > 100 ns

VOVRSHT

–

5.0%

–

Load Ripple

0.5 A maximum

VOUTRIPPLE

–

100

–

VBOOST GENERATOR

Charge Pump Output Voltage

ILOAD = 1.0 mA

VVB-VVB+

–

BIPOLAR CURRENT REGULATED STEP MOTOR DRIVE SYSTEM

Peak Step Motor Current, Phase A or B

Motor Not Stalled

ISTEPMOTOR

PEAK

–

0.6

Maximum Allowable Voltage Drop Across Any H-Bridge Switch

ILOAD = 0.6 A (from Output to GND) or ILOAD = 0.6 A (from VVB+ to

Output)

VDROP

–

1.6

Comparator High Threshold Voltage

CURR_I0_PHASEX=0, CURR_I1_PHASEX=0

VTH

450

550

650

Comparator Medium Threshold Voltage

CURR_I0_PHASEX=1, CURR_I1_PHASEX=0

VTM

300

–

440

Comparator Low Threshold Voltage

CURR_I0_PHASEX=0, CURR_I1_PHASEX=1

VTL

105

–

255

VOOFF Output Leakage Current for Step Motor Driver Outputs

VOOFF = 5.0 V

IOOFF

-1.0

0.1

1.0

Step Motor Driver Thermal Shutdown Junction Temperature

TJ(SHUTDOWN)

155

–

175

Step Motor Driver Thermal Enable Junction Temperature

TJ(ENABLE)

135

–

155

Single MOSFET

Typical Value @ TJ = 25°C

RDS(ON)

–

1.43

–

Ω

DC MOTOR DRIVE SYSTEM

Maximum Allowable Voltage Drop Across Any H-Bridge Switch

ILOAD = 0.75 A (from Output to GND) or ILOAD = 0.75 A (from VVB+ to

Output) (Using 2 H-Bridges in Parallel)

VDROP

–

1.3

Peak DC Motor Driver Current

Motor Not Stalled (Using 2 H-Bridges in Parallel)

IDCMOTOR

PEAK CURRENT

–

1.2

DC Motor Overcurrent Threshold (7)

Motor Stalled (Paralleled H-Bridges Used for DC Motor Drive)

IDCMOTOROCT

1.6

2.0

2.5

DC Motor Driver Sustaining Current Value

Current Allowed to Sustain for a Minimum of 100 ms (OCT delay),

Current Ripple 100 mA (Peak-to-Peak or Less)

IDC_SUSTAIN

1.6

2.0

2.4

Notes

Because the current clamp is applied to the top H-bridge transistors only, overcurrent protection applies to motor currents. But note that

no short circuit protection exists against shorts from the DC motor outputs (DR1A1, DR1A2, DR1B1, or DR1B2 to substrate ground or

to VB+.

Table 3. Static Electrical Characteristics (continued)

Characteristics noted under conditions 21 V ≤ VVB+ ≤ 42 V, TA = 10°C to 55°C, TJ max = 135°C, VCC = 5.25 V max unless

otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under typical conditions unless

otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

34920 Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc

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