A3904 Datasheet PDF - Allegro MicroSystems

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A3904
Allegro MicroSystems

Part Number A3904
Description Low Voltage Voice Coil Motor Driver
Page 9 Pages


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A3904
Low Voltage Voice Coil Motor Driver
Features and Benefits
Fixed I2C logic thresholds
8-bit D-to-A converter
500 μA resolution
Low voltage I2C serial interface
Low current-draw sleep mode
2.4 to 5.5 V operation
2 mm × 1.5 mm, 0.38 mm nominal overall height DFN
1.1 mm × 0.7 mm, 0.5 mm maximum overall height WLCSP
1.1 mm × 0.7 mm, 0.33 mm nominal overall height bare die
Packages:
1.5 mm × 2 mm DFN
(EW package)
1.1 mm × 0.7 mm WLCSP
(CG package)
Not to scale
Bare die
(CW package)
Description
The A3904 is a voice coil motor (VCM) driver, with an
I2C-compatible serial interface. Designed for camera autofocus
and zoom applications, this high accuracy digital IC is provided
in small packages ideal for portable devices. Its operating
voltage range is 2.4 to 5.5 V, and its maximum output current
is 127 mA.
Output current is programmed via the I2C interface, in 500 uA
increments, with clock rates up to 400 kHz. I2C inputs set the
internal D-to-A converter output voltage that is the reference
for linear current control via a MOSFET output sink transistor.
To conserve battery power, a logic low signal on the SLEEPZ
input disables the output MOSFET and reduces the supply
current to <0.5 μA.
A3904 internal protection features include thermal shutdown
and undervoltage lockout. Logic input levels are independent
of the supply voltage. The operating temperature range is
–40°C to 85°C.
The A3904 is available at three packaging levels: bare die on
wafer (suffix CW); bumped wafer level chip scale package
(WLCSP) (suffix CG); and complete thin profile (0.38 mm
nominal overall height) DFN package, with NiAuPd leadframe
plating and an exposed tab for enhanced thermal dissipation
(suffix EW).
www.DataSheet4U.com
Functional Block Diagram
1.8 V
2.4 to 5.5 V
1.8 kΩ
1.8 kΩ
I2C
Master
I2C
Slave
VDD
SDA
SCL
SLEEPZ
Bandgap
Ref
I2C Serial
Interface
8 Bit DAC
EW only
PAD
IOUT
2.4 Ω
GND
3904-DS, Rev. 2



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A3904
Low Voltage Voice Coil Motor Driver
Selection Guide
Part Number
A3904ECW
A3904ECGTR
A3904EEWTR-P
Packing
Wafer
4000 pieces per reel
3000 pieces per reel
Package
Bare die
Bumped wafer-level chip-scale
package (WLCSP)
Leadless package (DFN)
Pb-Free
Yes
Pb-free chip with high-temperature solder balls
(RoHS compliant)
Yes; NiAuPd leadframe plating
Absolute Maximum Ratings
Characteristic
Supply Voltage
Logic Input Voltage Range
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VDD
VIN
TA
TJ(max)
Tstg
Range E
Notes
Rating
6
–0.3 to VDD+0.3
–40 to 85
150
–55 to 150
Units
V
V
ºC
ºC
ºC
Thermal Characteristics
Characteristic
Symbol
Package Thermal Resistance, Junction
to Ambient
RθJA
*For additional information, refer to the Allegro website.
Test Conditions*
EW package, 4-layer PCB based on JEDEC
standard
www.DataSheet4U.com
Pin-out Diagrams
CG Package
EW Package
Rating
64
A1 A2 A3
B1 B2 B3
Orientation mark
on ball side
Terminal List
Number
EW
1
2
3
4
5
6
PAD
CG
A1
A2
A3
B3
B2
B1
Name
SDA
SCL
VDD
GND
IOUT
SLEEPZ
SDA
SCL
VDD
1
2
3
PAD
6 SLEEPZ
5 IOUT
4 GND
Description
I2C data input/output
I2C clock
Power supply
Ground
Sink drive output
Standby mode control
Exposed thermal pad (tie to GND)
Units
ºC/W
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2



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A3904
Low Voltage Voice Coil Motor Driver
ELECTRICAL CHARACTERISTICS Valid at TA= 25°C, VDD = 2.4 to 5.5 V, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
General
Supply Current
IDD Sleep mode (SLEEPZ = Low)
– 0.5
– <100
UVLO Enable Threshold
UVLO Hysteresis
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Power-Up Delay
D-to-A Converter
VUV(th)
VUV(hys)
TJTSD
.TJTSD(hys)
td(on)
VDD rising
Temperature increasing
TJTSD(hys) = TJTSD – TJ(recover)
– 2.1
100 –
– 165
– 15
– 10
Resolution
Res Target = 500 μA / LSB
–8
LSB Relative Accuracy
INL Code = 16 to 255, Endpoint method
±4
LSB Differential Nonlinearity
DNL
Guaranteed monotonic
––
Maximum Output Current
Gain Error
Gain Error Drift*
Offset Error
Imax
errA
errA
IerrOS
Code = 255
TJ = 25°C, Code 16 to 255,
VDD = 2.6 to 3.0 V
TJ = –40°C to 125°C
Code = 1
Code = 16
Output
Output Voltage Range
Output On Resistance
I2C Interface
VOUT
RDS(on)
RSENSE + RSINK, IOUT = 127.5 mA
Bus Free Time Between Stop and Start
Hold Time Start Condition
Setup Time for Repeated Start Condition
wwwSC.DLaLtaoSwhTeiemt4eU.com
SCL High Time
Data Setup Time
Data Hold Time
tBUF
thdSTA
tsuSTA
tLOW
tHIGH
tsuDAT
thdDAT
Setup Time for Stop Condition
tsuSTO
Logic Input Low Level (SDA, SCL pins)
VIL
Logic Input High Level (SDA, SCL pins)
VIH
Input Hysteresis (SDA, SCL pins)
Vhys
SLEEPZ Input Low Level
VinSLP
SLEEPZ Input High Level
VinSLP
Logic Input Current
IIN VIN = 0 V to VDD
Output Voltage (SDA pin)
VOL ILOAD = 1.5 mA
Clock Frequency (SCL pin)
fCLK
Output Fall Time (SDA pin)
tfO VIH to VIL
*Guaranteed by design and characterization, not production tested
–10
0
0.5
0.500
1.3
0.6
0.6
1.3
0.6
100
0
0.6
1.26
1.5
–1
127.5
<3
0.2
1
3
100
0
Max.
Units
2
500
2.395
mA
nA
V
mV
°C
°C
μs
±1
10
5
VDD–0.1
900
0.84
0.7
1
0.36
400
250
bit
LSB
LSB
mA
%FS
LSB/°C
mA
mA
V
Ω
μs
μs
μs
μs
μs
ns
ns
μs
V
V
mV
V
V
μA
V
kHz
ns
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3



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A3904
Low Voltage Voice Coil Motor Driver
I2C Interface Timing Diagram
tsuSTA thdSTA
tsuDAT
thdDAT
tsuSTO
tBUF
SDA
SCL
tLOW
tHIGH
Write Register Bit Definition and Timing Diagram
Start
Address
Acknowledge
Write (from A3904)
Control Data
Acknowledge
(from A3904) Stop
SDA
0 0 0 1 1 x x 0 AK D7 D6 D5 D4 D3 D2 D1 D0 AK
SCL 1 2 3 4 5 6 7 8 9
www.DataSheet4U.com
I2C Control Register Bit Definition
Bit Name
0 D0
1 D1
2 D2
3 D3
4 D4
5 D5
6 D6
7 D7
A3904 Slave Address Bit Definition
Bit
0123
4
00011
5
x
Function
DAC LSB
DAC MSB
Operation
67
1
X
0
Read
Write
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4



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