A3904 데이터 시트보기 (PDF) - Allegro MicroSystems
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A3904 Datasheet PDF : 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).
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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