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A3904

Allegro MicroSystems
Part Number A3904
Manufacturer Allegro MicroSystems
Description Low Voltage Voice Coil Motor Driver
Published Jan 13, 2010
Detailed Description A3904 Low Voltage Voice Coil Motor Driver Features and Benefits ▪ Fixed I2C logic thresholds ▪ 8-bit D-to-A converter ▪ ...
Datasheet PDF File A3904 PDF File

A3904
A3904


Overview
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 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).
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) www.
DataSheet4U.
com Functional Block Diagram 1.
8 V 2.
4 to 5.
5 V VDD IOUT 1.
8 kΩ 1.
8 kΩ I2C Master SDA SCL Bandgap Ref 8 Bit DAC I2C Serial Interface 2.
4 Ω GND I2C Slave SLEEPZ PAD EW only 3904-DS, Rev.
2 A3904 Low Voltage Voice Coil Motor Driver Selection G...


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