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Related Links:

Datasheets:
A3904: Low Voltage Voice Coil Motor Driver (PDF)

Selection Guides:
Power Motor Drivers - Full-Bridge

when this product is updated

Press Releases:
A3904: Allegro MicroSystems, Inc. Announces New Low Voltage Voice Coil Motor Driver with I2C Interface

A3904
Low Voltage Voice Coil Motor Driver

Features

• 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 µA 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

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3904ECGTR	6-lead CSP	--	--	-40 °C to  85 °C	new
A3904ECW	0-lead wafer	--	--	-40 °C to  85 °C	new	samples not available
A3904EEWTR-P	6-lead MLP/DFN	Yes	view data	-40 °C to  85 °C	new	samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.