Single-coil 12V high-speed code-free fan driver
MLX90418 Melexis
The MLX90418 is a 1-coil BLDC fan driver designed for server market. It represents a highly effective 1-coil solution that reduces Bill of Material (BoM) costs compared to existing three-phase BLDC fans.
Top features
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Open and closed-loop speed control
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Up to 40k m-RPM (for 2 pole-pair motors)
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±1.5 % closed-loop speed accuracy
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Soft-switching
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Lead angle control
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Configurable motor start & stop options
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Forward windmilling
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Reverse windmilling
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(Universal windmilling)
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Integrated bridge driver
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135 mOhm (HS+LS)
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Programmable current limit up to 4.0 A
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8.0 A braking current
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Integrated supply clamp
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Operating range
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Supply voltage range from 6.7 V to 18 V
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Junction temperature from -40 °C to 150 °C
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Extensive programmability (MTP)
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Sleep mode option
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8-point configurable speed curves
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Synthesized FG output for easy retrofitting of legacy 3-phase solutions
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Protections & Diagnostics
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LRP / UVP / OCP / TSD
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Hot unplug handling with power loss brake option
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AC-power loss management
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Package RoHS compliant
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DFN10 3.5x3 mm2 with exposed pad
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Single-coil 12V high-speed code-free fan driver - MLX90418
Product description
The MLX90418 is 1-coil BLDC motor driver IC. It can be configured for a wide range of applications and supports replacing legacy sensorless 3-phase motors. Furthermore, it includes dedicated features for high-speed server fan applications. With the MLX90418, 1-coil solutions are extended up to 30 W in 4 cm and 6 cm server fans.
The device drives 12 V 1-coil motors, without the need for an external TVS for protection. It integrates two half bridges with very low RDSon, supporting 8 A braking current and a programmable current limit up to 4 A.
The MLX90418 is controlled via a PWM input, and provides speed feedback through a programmable FG output. Extensive speed curve fitting is available with 8 configuration points, up to 40k m-RPM (for 2 pole-pair motors).
The non-volatile memory can be programmed through I2C and is “Multiple Times Programmable”. The IC features a wide range of protections, including: “Locked Rotor Protection”, “Under Voltage Protection” with hot unplug handling, “Thermal Shut Down” and “Over Current Protection”.
The code-free plug-and-play functionality, avoids the need for software validation of MCU-based solutions, freeing up key engineering resources for realizing more projects in less time, and enabling faster production ramp-up.
In order to support new developments a FandriverEVB2 (device control & programming) and a FandriverProgrammerB (multiple device programming) are available. Additionally, a motor parameter extraction tool is available for fast validation
Application Examples
- High-speed server cooling fans
- General 12V fans & pumps up to 30W
Features and benefits
-
Open and closed-loop speed control
-
Up to 40k m-RPM (for 2 pole-pair motors)
-
±1.5 % closed-loop speed accuracy
-
Soft-switching
-
Lead angle control
-
-
Configurable motor start & stop options
-
Forward windmilling
-
Reverse windmilling
-
(Universal windmilling)
-
-
Integrated bridge driver
-
135 mOhm (HS+LS)
-
Programmable current limit up to 4.0 A
-
8.0 A braking current
-
Integrated supply clamp
-
-
Operating range
-
Supply voltage range from 6.7 V to 18 V
-
Junction temperature from -40 °C to 150 °C
-
-
Extensive programmability (MTP)
-
Sleep mode option
-
8-point configurable speed curves
-
Synthesized FG output for easy retrofitting of legacy 3-phase solutions
-
-
Protections & Diagnostics
-
LRP / UVP / OCP / TSD
-
Hot unplug handling with power loss brake option
-
AC-power loss management
-
-
Package RoHS compliant
-
DFN10 3.5x3 mm2 with exposed pad
-
