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A3985 Datasheet(PDF) 5 Page - Allegro MicroSystems

Part No. A3985
Description  Digitally Programmable Dual Full-Bridge MOSFET Driver
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3985 Datasheet(HTML) 5 Page - Allegro MicroSystems

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Digitally Programmable
Dual Full-Bridge MOSFET Driver
A3985
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ELECTRICAL CHARACTERISTICS
, continued, at TA = 25°C, VDD = 5 V, VBB = 12 to 50 V, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Current Control
Blank Time
tBLANK
fMCK = 4 MHz;
Word1:Bits D1 and D2 = 00
–1–
μs
Fixed Off-Time
tOFF
fMCK = 4 MHz,
Word1:Bits D3 to D7 = 01010, and
D15 = 0
21.75
22
μs
Reference Input Voltage
VREF
0.8
2
V
Internal Reference Voltage
VREFInt
20 kΩ to VDD
1.9
2.0
2.1
V
Current Trip Point Error2
EITrip
VREF = 2 V
±5
%
Reference Input Current1
IREF
–3
0
3
μA
Internal Oscillator Frequency
fOSC
ROSC = 10 kΩ
3.2
4
4.8
MHz
Maximum Clock Input Frequency
fEXTmax
External clock selected
10
MHz
Master Clock Frequency
fMCK
0.5
4
5
MHz
Protection
VREG Undervoltage Lockout
VREGUV Decreasing VREG
7.5
8
8.5
V
VREG Undervoltage Lockout
Hysteresis
VREGUVHys
100
200
mV
VDD Undervoltage Lockout
VDDUV
Decreasing VDD
2.45
2.7
2.95
V
VDD Undervoltage Lockout
Hysteresis
VDDUVHys
50
100
mV
Overtemperature Shut Down
TTSD
Temperature increasing
165
ºC
Overtemperature Shut Down
Hysteresis
TTSDHys Recovery = TTSD – TTSDHys
–15–
ºC
Continued on the next page...
THERMAL CHARACTERISTICS
Characteristic
Symbol
Test Conditions*
Value Units
Package Thermal Resistance
RθJA
4-layer PCB, based on JEDEC standard
47
ºC/W
1-layer PCB with copper limited to solder pads
114
ºC/W
*Additional thermal information available on Allegro Web site.


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