Datasheet
DRV8821
www.ti.com
SLVS912H –JANUARY 2009–REVISED AUGUST 2013
DISSIPATION RATINGS
DERATING FACTOR
BOARD PACKAGE R
θJA
T
A
< 25°C T
A
= 70°C T
A
= 85°C
ABOVE T
A
= 25°C
Low-K
(1)
75.7°C/W 13.2 mW/°C 1.65 W 1.06 W 0.86 W
Low-K
(2)
32°C/W 31.3 mW/°C 3.91 W 2.50 W 2.03 W
DCA
High-K
(3)
30.3°C/W 33 mW/°C 4.13 W 2.48 W 2.15 W
High-K
(4)
22.3°C/W 44.8 mW/°C 5.61 W 3.59 W 2.91 W
(1) The JEDEC Low-K board used to derive this data was a 76-mm x 114-mm, 2-layer, 1.6-mm thick PCB with no backside copper.
(2) The JEDEC Low-K board used to derive this data was a 76-mm x 114-mm, 2-layer, 1.6-mm thick PCB with 25-cm
2
2-oz copper on back
side.
(3) The JEDEC High-K board used to derive this data was a 76-mm x 114-mm, 4-layer, 1.6-mm thick PCB with no backside copper and
solid 1-oz internal ground plane.
(4) The JEDEC High-K board used to derive this data was a 76-mm x 114-mm, 4-layer, 1.6-mm thick PCB with 25-cm
2
1-oz copper on back
side and solid 1-oz internal ground plane.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
V
M
Motor power supply voltage range 8 32 V
I
MOT
Continuous motor drive output current
(1)
1 1.5 A
V
REF
VREF input voltage 1 4 V
(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
I
VM
V
M
operating supply current V
M
= 24 V, no loads 5 8 mA
I
VMSD
V
M
shutdown supply current V
M
= 24 V, ABENBLn = CDENBLn = 1 2.5 μA
V
UVLO
V
M
undervoltage lockout voltage V
M
rising 6.5 8 V
V
CP
Charge pump voltage Relative to V
M
12 V
V
V3P3
V
V3P3
output voltage 3.20 3.30 3.40 V
LOGIC-LEVEL INPUTS
V
IL
Input low voltage 0.7 V
V
IH
Input high voltage 2 V
V
HYS
Input hysteresis 0.3 0.45 0.6 V
Input current
I
IN
VIN = 3.3 V 100 μA
(internal pulldown current)
OVERTEMPERATURE PROTECTION
t
TSD
Thermal shutdown temperature Die temperature 150 °C
MOTOR DRIVER
V
M
= 24 V, I
O
= 0.8 A, T
J
= 25°C 0.25
Motor AB FET on resistance
R
ds(on)
Ω
(each individual FET)
V
M
= 24 V, I
O
= 0.8 A, T
J
= 85°C 0.31 0.37
V
M
= 24 V, I
O
= 0.8 A, T
J
= 25°C 0.30
Motor CD FET on resistance
R
ds(on)
Ω
(each individual FET)
V
M
= 24 V, I
O
= 0.8 A, T
J
= 85°C 0.38 0.45
I
OFF
Off-state leakage current ±12 μA
f
PWM
Motor PWM frequency
(1)
45 50 55 kHz
t
BLANK
ITRIP blanking time
(2)
3.75 μs
t
F
Output fall time 50 300 ns
t
R
Output rise time 50 300 ns
(1) Factory option 100 kHz.
(2) Factory options for 2.5 μs, 5 μs or 6.25 μs.
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