RAA271041 Cold Crank Boost and Buck Controller with Drivers for ASIL-D Automotive Applications Short-Form Datasheet
■For cold crank applications, the Channel 2 Boost has an adjustable output and is active when the VBAT input voltage falls below a user-programmable threshold. If the V BAT input is above the user-programmed threshold, the Boost controller offers a Boost Bypass mode in which the high-side MOSFET of the Boost channel is held on and the
V BAT input voltage is passed directly to the Boost output. The Boost channel can also be configured as a standalone Boost, which is always on.
■The Boost output from Channel 2 supplies the input for Channel 1 buck. The Buck can be configured either as fixed 5V or fixed 3.3V output or as an adjustable output from 0.8V to 12V using a resistor divider from VOUT1 to FB1 to ground. The RAA271041 requires a minimum input voltage of 6V for start-up. The Channel 2 Boost has an input range from 2.2V to 42V, while the Channel 1 Buck has an input range from 3.5V to 42V.
■The RAA271041 Buck channel can operate in Energy Conservation Mode (ECM) to provide a low IQ mode by reducing quiescent current draw to 6μA (typical) when no external load is applied. The Buck and Boost switching frequencies are factory programmed to 400kHz or 2.2MHz. Optional spread spectrum operation allows for a reduction of EMI and noise levels.
■Features
▲ASIL-D Functional Safety
▲40V Boost and Buck integrated driver controller
▲FET drivers support source/sink current of 2A/3A
▲Low I_Q with ECM mode of 6μA typical
▲Separate Wake (Enable) inputs for each channel
▲Minimized FET ON and OFF times (20ns and 50ns)
▲Optional pseudo-random spread spectrum clocking
▲Buck frequency options 400kHz or 2.2MHz
▲Boost frequency options 400kHz or 2.2MHz (2.2MHz requires Buck frequency at 2.2MHz)
▲VBATS sense for boost enable during cold crank
▲Boost Bypass mode (with buck in CCM)
▲External synchronization via SYNC pin
▲Dual over-temperature protection monitors
▲6x6mm 36Ld SC-QFN package
▲AEC-Q100 grade 1 qualified
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[ ASIL-D Automotive Applications ][ Automotive battery supplied applications ][ In cabin systems ][ ADAS: Advanced Driver Assist Systems ][ Start-stop protected systems ][ head unit ][ cluster, e-Mirror ] |
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Datasheet |
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Please see the document for details |
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SC-QFN |
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English Chinese Chinese and English Japanese |
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Sep 28, 2021 |
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Rev.1.00 |
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R33DO0006EU0100 |
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613 KB |
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