Buck converters and controllers reduce IQ for instrument clusters

Five power management ICs (PMICs), the MAX20004/6/8, MAX20034 and MAX20098, offer low quiescent current (IQ), with EMI mitigation for digital instrument clusters and radiohead units, says Maxim Integrated Products.

The PMICs are claimed to be the industry’s smallest size and highest efficiency to help automotive designers meet space and power challenges of digital instrument clusters, radiohead units and electronic subsystems require higher levels of compute power. Designers can use the high-power buck converters and high-power, multi-phase buck controllers to balance low power consumption with high efficiency EMI mitigation, says Maxim.

With a package size of 3.5 x 3.75mm, the buck converters offer the industry’s smallest solution size, claims Maxim. Their flip-chip, quad-flat, no-leads (FCQFN) packaging reduces high-frequency switch node ringing and eliminates bond wires to lower MOSFET switch on-resistance and increase efficiency. Maxim claims to offer the industry’s only pin-compatible parts for 4.0, 6.0 and 8.0A for flexible power regulation. All the ICs feature spread-spectrum modulation, high switching frequency, forced pulse-width modulation (PWM) and skip-mode operation.

The MAX20004, MAX20006 and MAX20008 4.0, 6.0 and 8.0A, 40V tolerant, synchronous buck converters with integrated high-side and low-side MOSFETs, offer the industry’s lowest switch resistance of 38 and 18 mOhm, respectively, claims Maxim. The pin-compatible devices include 25 microA quiescent current, operating input voltages from 3.5 to 36V and 93 per cent peak efficiency. The company adds that the 17-pin side-wettable QFN package reduces high-frequency switch node and improves efficiency.

The MAX20098 220kHz to 2.2MHz synchronous buck controller is for applications with mid- to high-power requirements operating with input voltages from 3.5 to 36V (42V tolerant). It has a quiescent current of 3.5 microA in skip mode at 3.3V output and a one microA typical shutdown current specification. Its 3.0 x 3.0mm side-wettable QFN package saves space. The IC requires few external components, enabling a two-layer PCB design.

The MAX20034 220kHz to 2.2MHz dual synchronous buck controller is for high-voltage applications operating with input voltages from 3.5 to 36V (42V tolerant), where one regulator will operate as a fixed 5.0 or 3.3V output and the other output is adjustable between 1.0 to 10V. Key efficiency advantages include 17 microA quiescent current in skip mode and 6.5 microA typical shutdown current. The device is available in a 5.0 x 5.0mm side-wettable QFN package, and it provides up to 2.2MHz switching frequency to enable smaller external components and total solution size, adds Maxim.


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