A6861
Automotive 3-Phase Isolator MOSFET Driver
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FEATURES AND BENEFITS
3 floating N-channel MOSFET drives
Maintains VGS with 100 kΩ gate-source resistors
Integrated charge pump controller
4.5 V-50 V Supply voltage operating range
Independent TTL input for each phase
150°C ambient (165°C junction) continuous
A
2-
SIL
TM
Product – device features for safety critical
systems
3-phase safety disconnect systems
Electric power steering (EPS)
Electric braking
3-phase Solid State Relay driver
DESCRIPTION
APPLICATIONS
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The A6861 is an N-channel power MOSFET driver capable
of controlling MOSFETs connected as a 3-phase solid state
relay in phase-isolation applications. The A6861 is intended
for automotive systems that must meet ASIL requirements. In
safety critical applications motor isolation is a critical safety
requirement which is currently addressed with discrete circuitry
or relays. Allegro A
2-
SIL
TM
products include specific features
that compliment proper system design, allowing users to achieve
up to ASIL-D system rating.
The A6861 has three independent floating gate drive outputs
to maintain the power MOSFETs in the on state over the full
supply range with high phase-voltage slew rates. An integrated
charge pump regulator provides the above battery supply
voltage necessary to maintain the power MOSFETs in the
on state continuously when the phase voltage is equal to the
battery voltage. The charge pump will maintain sufficient gate
drive (>7.5 V) for battery voltages down to 4.5 V with 100 kΩ
gate-source resistors.
The three gate drives can be independently controlled by a logic
level control input. In typical applications the MOSFETs will
be switched on within 8 µs and will switch off within 1 µs.
An undervoltage monitor checks that the pumped supply voltage
is high enough to ensure that the MOSFETs are maintained in
a safe conducting state.
Continued on the next page…
Package: 16-Lead TSSOP with exposed
thermal pad (suffix LP)
Not to scale.
Typical Application Diagram
6861-DS, Rev. 4
A6861
Description (continued)
Automotive 3-Phase Isolator MOSFET Driver
The A6861 is supplied in a 16-lead TSSOP (LP), with exposed pad
for enhanced thermal dissipation. They are lead (Pb) free, with 100%
matte tin leadframe plating.
Selection Guide
Part Number
Packing
13-in. reel, 4000 pieces/reel
Package
16-Lead TSSOPwith exposed thermal
pad, 4.4 X 5 mm case
A6861KLPTR-T
SPECIFICATIONS
Absolute Maximum Ratings
1
Characteristic
Load Voltage Supply
Terminal VCP
Terminal CP1
Terminal CP2
Terminal CP3
Terminal CP4
Terminal ENU, ENV, ENW
Terminal GU, GV, GW
Terminal SU, SV, SW
Operating Ambient Temperature
Maximum ContinuousJunction Temperature
Transient Junction Temperature
Storage Temperature
1
With
Symbol
V
BB
V
CP
V
CP1
V
CP2
V
CP3
V
CP4
V
I
V
GX
V
SX
T
A
T
J(max)
T
Jt
T
stg
Notes
Rating
–0.3 to 50
V
BB
– 0.3 to
V
BB
+ 12
V
BB
– 12 to
V
BB
+ 0.3
V
BB
– 0.3 to
V
CP4
+ 0.3
V
BB
– 12 to
V
BB
+ 0.3
V
CP2
– 0.3 to
V
CP
+ 0.3
–0.3 to 50
V
SX
– 0.3 to
V
SX
+ 12
– 6 to V
BB
+ 5
Units
V
V
V
V
V
V
V
V
V
ºC
ºC
ºC
ºC
Limited by power dissipation
Over temperature event not exceeding 10s, lifetime
duration not exceeding 10hours, guaranteed by design
characterization.
–40 to 150
165
175
–55 to 150
respect to GND. Ratings apply when no other circuit operating constraints are present.
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Pad)
Symbol
R
θJA
R
θJP
Test Conditions*
4-layer PCB based on JEDEC standard
1-layer PCB with copper limited to solder pads
Value
34
43
2
Units
ºC/W
ºC/W
ºC/W
*Additional thermal data available on the Allegro Web site.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A6861
Automotive 3-Phase Isolator MOSFET Driver
Pin-out Diagram and Terminal List Table
VBB
CP4
CP3
CP2
CP1
ENU
ENV
ENW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCP
GU
SU
GV
SV
GW
SW
GND
Package LP, 16-Pin TSSOP Pin-out Diagram
Terminal List Table
Name
VBB
CP4
CP3
CP2
CP1
ENU
ENV
ENW
GND
SW
GW
SV
GV
SU
GU
VCP
Tab
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Main Power Supply
Pump Capacitor Connection
Pump Capacitor Connection
Pump Capacitor Connection
Pump Capacitor Connection
U phase Enable Input
V phase Enable Input
W phase Enable Input
Ground
W Phase MOSFET Source Reference
W Phase MOSFET Gate Drive
V Phase MOSFET Source Reference
V Phase MOSFET Gate Drive
U Phase MOSFET Source Reference
U Phase MOSFET Gate Drive
Pump Supply
Exposed Tab - Connect to GND
Description
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A6861
Automotive 3-Phase Isolator MOSFET Driver
Battery
VCP
Optional
Reverse
Protected
Supply
Network
VCP
C
VCP
VBB
CP4
C
CP2
Protected
Supply
C
CP1
CP1
GND
R
GPD
SV
ENU
R
PD
ENV
R
PD
ENW
R
PD
GND
Level Shift
Level Shift
Level Shift
VCP
Floating
Gate-Drive
R
GPD
SW
Motor
GW
Bridge
Motor
CP3
CP2
Charge Pump
Bridge
VCP
Floating
Gate-Drive
GV
VCP
Floating
Gate-Drive
R
GPD
SU
Motor
GU
Bridge
Functional Block Diagram
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A6861
Automotive 3-Phase Isolator MOSFET Driver
ELECTRICAL CHARACTERISTICS at T
J
= -40 to +150°C, V
BB
6 V to 50 V (unless noted otherwise)
Characteristics
Supply
Operating. Outputs active.
VBB Functional Operating Range
1
V
BB
I
BBQ
I
BBS
VCP Output voltage w.r.t. V
BB
V
CP
Operating. Outputs disabled
No unsafe states.
VBB Quiescent Current
Gate drive active, V
BB
= 12 V,
Sx = GND.
Gate drive disabled, V
BB
= 12 V
V
BB
> 9V, I
VCP
> -1 mA
[2]
6 V < V
BB
≤ 9 V, I
VCP
> -1 mA
[2]
4.5 V < V
BB
≤ 6 V, I
VCP
> - 800 µA
[2]
VCP Static Load Resistor
Gate Output Drive
Turn-on Time
Turn-off Time
Propagation Delay – Turn
Turn-on Pulse Current
Turn-on Pulse Time
On Hold Current
Pull-down On Resistor
Gx Output high voltage
w.r.t. SX, or VBB if SX>VBB
Gate Drive Static Load Resistance
Gx Output Voltage Low
Gx Passive Pull-down
Logic Inputs & Outputs
Input Low Voltage
Input High Voltage
Input Hysteresis
Input Pull-down Resistor
Diagnostics & Protection
VCP Undervoltage Start-up Blank
Timer
VCP Undervoltage Lockout
1
2
For
Symbol
Test Conditions
Min.
4.5
4
0
–
–
9
8
7.5
100
Typ.
–
–
–
10
5.5
10
10
9.5
–
Max.
50
50
50
13.5
8
11
11
–
–
Units
V
V
V
mA
mA
V
V
V
kΩ
R
CP
Between VCP and VBB (using ±1% tolerance
resistor)
C
LOAD
= 10 nF, 20% to 80%
C
LOAD
= 10 nF, 80% to 20%
C
LOAD
= 10 nF, ENx high to Gx 20%
C
LOAD
= 10 nF, ENx low to Gx 80%
t
r
t
r
On
3
t
PON
t
POFF
I
GXP
t
GXP
I
GXH
R
DS(on)DN
V
GH
R
GS
V
GL
R
GPD
V
IL
V
IH
V
Ihys
R
PD
t
CPON
V
CPON
V
CPOFF
–
–
–
–
–
–
–
5
0.5
–
–
14
12.5
400
5
10
10
10
9.5
–
–
950
–
–
300
50
100
6.7
6.5
–
–
3
1.5
–
–
–
–
–
12
12
–
–
V
SX
+0.3
–
0.8
–
–
70
–
7.2
7.0
µs
µs
µs
µs
mA
µs
μA
Ω
Ω
V
V
V
kΩ
V
kΩ
V
V
mV
kΩ
µs
V
V
Propagation Delay – Turn Off
3
T
J
= 25°C, I
Gx
= 10 mA
T
J
= 150°C, I
Gx
= 10 mA
V
BB
> 9 V
6 V < V
BB
≤ 9 V
4.5 V < V
BB
≤ 6 V
Between Gx and Sx (using ±1% tolerance resistor)
-10 µA < I
Gx
< 10 µA
V
Gx
- V
Sx
< 0.3 V
–
–
8.5
8
7.5
100
–
–
–
2.0
150
30
–
V
CP
w.r.t. V
BB.
V
CP
rising
V
CP
w.r.t. V
BB.
V
CP
falling
6.2
6.0
Function is correct but parameters are not guaranteed below the general limits (6-50V).
input and output current specifications, negative current is defined as coming out of (sourcing) the specified device terminal.
3
Refer to Figure 1.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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