Dual Half Bridge Motor Driver A3910

A3910
Dual Half Bridge Motor Driver
Description
Features and Benefits
• Low RDS(on) outputs
• Standby mode with zero current drain
• Small 2 × 2 DFN package
• Crossover Current protection
• Thermal Shutdown protection
The A3910 is a dual half bridge motor driver, designed for
low cost, low voltage battery operated power applications.
The outputs are rated for operation up to 500 mA.
Direct control of high- and low-side drivers is implemented
to allow either high-side or low-side PWM. The motor can
be connected to either supply or GND. Using a MOS switch
results in improved braking action for the motor, compared to
implementation with simple clamp diode.
The A3910 is supplied in a 2 mm × 2 mm 8-contact DFN
package (EE) with exposed thermal pad. The package is lead
(Pb) free, with 100% matte tin leadframe plating.
Package: 8-contact DFN with Exposed
Thermal Pad (suffix EE)
Not to scale
Typical Application Diagram
VSUPPLY
VSUPPLY
System
Controller
A3910
(A) Connection to Supply
A3910-DS, Rev. 1
System
Controller
A3910
M
M
M
M
(B) Connection to Ground
A3910
Dual Half Bridge Motor Driver
Selection Guide
Part Number
Packing*
Package
A3910EEETR-T
3000 pieces per 7-in. reel
8-contact DFN
with exposed thermal pad
*Contact Allegro™ for additional packing options.
Absolute Maximum Ratings*
Rating
Unit
Supply Voltage
Characteristic
Symbol
VBB
Notes
–0.3 to 5.5
V
Logic Input Voltage Range
VIN
–0.3 to 6
V
Output Current
IOUT
500
mA
Output Voltage
VOUT
–0.3 to VBB + 1
V
Operating Ambient Temperature
TA
–40 to 85
ºC
Maximum Junction Temperature
TJ(max)
150
ºC
Tstg
–55 to 150
ºC
Storage Temperature
E temperature range
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
On 4-layer PCB based on JEDEC standard
RθJA
Package Thermal Resistance
On 2-layer PCB based with 0.23
copper each side
in.2
exposed
Value
Unit
49
ºC/W
92
ºC/W
*Additional thermal information available on the Allegro website.
Terminal List Table
Pin-out Diagram
HIN1 1
8
OUT1
LIN1 2
7
VBB
6
GND
5
OUT2
LIN2 3
HIN2 4
PAD
Number
Name
Function
1
HIN1
Logic input
2
LIN1
Logic input
3
LIN2
Logic input
4
HIN2
Logic input
5
OUT2
Motor terminal
6
GND
Ground
7
VBB
Input Supply
8
OUT1
Motor terminal
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A3910
Dual Half Bridge Motor Driver
Functional Block Diagram
VBB
Gate Drive
Supply
HIN1
VIN = 3 V typ
(Option:
VBB or GND)
VBB
OUT1
LIN1
Sleep
Mode
Disable
TSD
TSD
Disable
GND
VBB
VBB
Gate
Drive
HIN2
VBB
OUT2
LIN2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A3910
Dual Half Bridge Motor Driver
ELECTRICAL CHARACTERISTICS* Valid at TA = 25°C; unless otherwise specified
Characteristic
Symbol
VBB Supply Range
VBB
VBB Supply Current
IBB
Output Driver On-Resistance
Input Logic Low Level
Input Logic High Level
Input Hysteresis
Logic Input Current
RDS(on)
Thermal Shutdown Hysteresis
Min.
Typ.
Max.
Unit
2.5
–
5.5
V
Both bridges, PWM = 50 kHz
–
0.3
1
mA
Sleep mode (HIN1 = HIN2 = LIN1 = LIN2 = 0 V)
–
<1
1
μA
Source driver, I = 400 mA, VBB = 3 V
–
1.1
1.4
Ω
Source driver, I = 400 mA, VBB = 5 V
–
0.8
1
Ω
Sink driver, I = 400 mA, VBB = 3 V
–
0.5
0.65
Ω
Sink driver, I = 400 mA, VBB = 5 V
–
0.4
0.52
Ω
VIL
–
–
0.5
V
VIH
VBB / 2
–
–
V
VHYS
50
150
300
mV
IIN
Thermal Shutdown Temperature
Test Conditions
VIN = 3.3 V (Pulldown = 100 kΩ)
–
33
50
μA
TJTSD
Temperature increasing
–
165
–
°C
ΔTJ
Recovery = TJTSD – ΔTJ
–
15
–
°C
*Specified limits are tested at a single temperature and assured over operating temperature range by design and characterization.
Logic Table
HINx
LINx
OUTx
Function Motor to Supply
Function Motor to GND
0
0
Hi-Z1
Coast (Sleep2)
Coast (Sleep2)
1
0
High
Brake
Drive
0
1
Low
Drive
Brake
1
1
Hi-Z1
Coast
Coast
1Hi-Z
is high impedance.
2Sleep mode activated by all four inputs <100 mV.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A3910
Dual Half Bridge Motor Driver
Characteristic Performance
Output On-Resistance versus Load Supply Voltage
1.8
1.6
RDS(on) (Ω)
1.4
1.2
Source = 500 mA
1.0
Source = 100 mA
Sink = 500 mA
0.8
Sink = 100 mA
0.6
0.4
0.2
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VBB (V)
Output On-Resistance versus Output Current
1.8
1.6
RDS(on) (Ω)
1.4
1.2
Source = 3 V
1.0
Source = 5 V
Sink =3 V
0.8
Sink = 5 V
0.6
0.4
0.2
0
100
200
300
400
500
I OUT (mA)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
A3910
Dual Half Bridge Motor Driver
Package EE, 8-Contact DFN
with Exposed Thermal Pad
0.30
0.50
8
2.00 ±0.15
8
0.83
2.00 ±0.15
0.90
2.13
A
1
9X
2
D
SEATING
PLANE
0.08 C
+0.05
0.55 –0.04
0.25 ±0.05
0.50
1
C
1.60
PCB Layout Reference View
For reference only (DWG-2857), not for tooling use
(reference JEDEC MO-229UCCD)
Dimensions in millimeters
Exact case and lead configuration at supplier discretion within limits shown
2
0.325 ±0.050
0.90
B
8
1
C
1.60
A Terminal #1 mark area
B Exposed thermal pad (reference only, terminal #1
identifier appearance at supplier discretion)
C Reference land pattern layout (reference IPC7351
SON50P200X200X100-9M);
All pads a minimum of 0.20 mm from all adjacent pads; adjust as
necessary to meet application process requirements and PCB layout
tolerances; when mounting on a multilayer PCB, thermal vias at the
exposed thermal pad land can improve thermal dissipation (reference
EIA/JEDEC Standard JESD51-5)
D Coplanarity includes exposed thermal pad and terminals
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
A3910
Dual Half Bridge Motor Driver
Revision History
Revision
Revision Date
Rev. 1
July 23, 2013
Description of Revision
Update Selection Guide
Copyright ©2013, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7