DRV8821 datasheet(5/22 Pages) TI

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DRV8821

www.ti.com

SLVS912C – JANUARY 2009 – REVISED JANUARY 2010

RECOMMENDED OPERATING CONDITIONS

over operating free-air temperature range (unless otherwise noted)

MIN

NOM

MAX

UNIT

Motor power supply voltage range

IMOT

Continuous motor drive output current(1)

1.5

VREF

VREF input voltage

(1)

Power dissipation and thermal limits must be observed.

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

POWER SUPPLIES

IVM

VM operating supply current

VM = 24 V, no loads

IVMSD

VM shutdown supply current

VM = 24 V, ABENBLn = CDENBLn = 1

2.5

VUVLO

VM undervoltage lockout voltage

VM rising

6.5

VCP

Charge pump voltage

Relative to VM

VV3P3

VV3P3 output voltage

3.20

3.30

3.40

LOGIC-LEVEL INPUTS

VIL

Input low voltage

0.7

VIH

Input high voltage

VHYS

Input hysteresis

0.3

0.45

0.6

Input current

IIN

VIN = 3.3 V

100

(internal pulldown current)

OVERTEMPERATURE PROTECTION

tTSD

Thermal shutdown temperature

Die temperature

150

°C

MOTOR DRIVER

VM = 24 V, IO = 0.8 A, TJ = 25°C

0.25

Motor #1 FET on resistance

Rds(on)

Ω

(each individual FET)

VM = 24 V, IO = 0.8 A, TJ = 85°C

0.31

0.37

VM = 24 V, IO = 0.8 A, TJ = 25°C

0.30

Motor #2 FET on resistance

Rds(on)

Ω

(each individual FET)

VM = 24 V, IO = 0.8 A, TJ = 85°C

0.38

0.45

IOFF

Off-state leakage current

±12

fPWM

Motor PWM frequency(1)

kHz

tBLANK

ITRIP blanking time(2)

3.75

Output fall time

300

Output rise time

300

IOCP

Overcurrent protect level

1.5

4.5

tOCP

Overcurrent protect trip time

2.5

tMD

Mixed decay percentage

Measured from beginning of PWM cycle

VREF INPUT/CURRENT CONTROL ACCURACY

IREF

xVREF input current

xVREF = 3.3 V

–3

xVREF = 2.5 V, derived from V3P3;

–5

71% to 100% current

ΔICHOP

Chopping current accuracy

xVREF = 2.5 V, derived from V3P3;

–10

20% to 56% current

(1)

Factory option 100 kHz.

(2)

Factory options for 2.5 ms, 5 ms or 6.25 ms.

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