4-Channel Automotive PMIC Meets Vehicle Camera Needs

Maxim Integrated Products has introduced a compact MAX20049 power management IC (PMIC) that integrates four power supplies into a tiny footprint. The device offers many options to support various output voltages, while also providing fault mitigation by flagging faults and shifts in output voltages.

Automotive camera modules tend to be size-constrained, so designers are constantly in search of a power management solution that can pack the necessary power and functionality into a small form factor. The 4-channel MAX20049 power management IC is almost 30 percent more compact than competitive solutions and offers the highest efficiency among other quad-power power management ICs in its class, says Maxim.

The chip offers many options to support modules that need various output voltages for different mixes of sensors and serializers, enabling designers to make changes in layout as needed or to fine-tune the IC to meet specific application requirements. The MAX20049 provides fault mitigation, a feature required by designers to help flag faults and shifts in output voltages to ensure that the cameras are working as needed.

Features:

  • Small Solution Size: has a PCB footprint that is almost 30 percent smaller than that of the closest competitor (38 mm2 compared to 53.3 mm2)
    • 4 outputs (dual bucks and dual LDOs) in a 3 mm x 3 mm QFN package
    • Protection unavailable in competitive products include over-voltage protection, under-voltage lockout, external power good (PGOOD) signal and cycle-by-cycle current limit
  • High Efficiency: system efficiency at full load is 74 percent (versus 69 percent for discrete automotive solutions)
  • Thermal performance plus high efficiency contributes to overall optimized performance
  • Flexibility: the dual buck converters and low-noise LDO support a wide voltage input range from 4V to 17 V, enabling power-over-coax (POC), typically from 8 V to 10 V. There is also an option of using one of the buck converters as an intermediate supply for generating typical sensor + serializer rails
    • Optimizes thermal performance and minimizes coax inrush current at startup
    • Flexible sequencing and fixed output voltages supporting various image sensors
  • Fault Mitigation: flags faults and shifts in output voltages to ensure cameras are working as intended
    • Once an over- or under-voltage signal is detected, the PGOOD pin will assert low
    • Cycle-by-cycle current limit implemented by the respective converter if either output is shorted
  • Low Noise: spread spectrum and 2.2 MHz switching frequency mitigates electromagnetic interference (EMI) to meet CISPR low-noise specifications

Maxim Integrated | www.maximintegrated.com

 

 

Low-Power PMIC Enables High Sensitivity Optical Measurements

Maxim Integrated Products has introduced its latest tiny, highly integrated power-management IC (PMIC). The ultra-low-power MAX20345 integrates a lithium charger and debuts a unique architecture that optimizes the sensitivity of optical measurements for wearable fitness and health applications. In wearables, optical-sensing accuracy is impacted by a variety of biological factors unique to the user. Designers have been striving to increase the sensitivity of optical systems, in particular the signal-to-noise ratio (SNR), to cover a broader spectrum of use cases.
Traditional low-quiescent-current regulators favored in wearable applications come with tradeoffs that degrade SNR on the wrist, such as high-amplitude ripple, low-frequency ripple and long-settling times. Some designers have even turned to high-quiescent-current alternatives to overcome these drawbacks, but they must deal with increased power consumption, which reduces battery runtime or requires a larger battery. According to Maxim, the MAX20345 features a first-of-its-kind buck-boost regulator based on an innovative architecture that’s optimized for highly accurate heart-rate, blood-oxygen (SpO2) and other optical measurements. The regulator delivers the desired low-quiescent current performance without the drawbacks that degrade SNR and, as a result, can increase performance by up to 7dB.

The MAX20345 is also the latest in a line of ultra-low-power PMICs for small wearables and IoT devices that help raise efficiency without sacrificing battery runtime. To meet these needs, the MAX20345 integrates a lithium-ion battery charger; six voltage regulators, each with ultra-low quiescent current; three nanoPower bucks (900 nA typical) and three ultra-low quiescent current LDO regulators (as low as 550 nA typical). Two load switches allow disconnecting of system peripherals to minimize battery drain. Both the buck-boost and the bucks support dynamic voltage scaling (DVS), providing additional power-saving opportunities when lower voltages can be deployed under favorable conditions. The MAX20345 is available in a 56-bump, 0.4mm pitch, 3.37 mm x 3.05 mm wafer-level package (WLP.)

Key Advantages

  • Superior Performance for Optical Systems: the integrated buck-boost regulator provides the low ripple at high frequency that will not interfere with optical measurements. These short settling times support the high-sensitivity optical-sensor measurements on wearables.
  • Extended Battery Life: regulators with nanoPower quiescent current reduce sleep and standby power, which in turn extends battery runtime and allows for smaller battery size. High-efficiency regulators preserve battery energy during active states.
  • Small Footprint: by eliminating multiple discrete components, the MAX20345 provides a sophisticated power architecture for space-constrained wearable and IoT designs.

The MAX20345 is available at Maxim’s website for $4.45 (1000-up, FOB USA) and is also available from authorized distributors. The MAX20345EVKIT# evaluation kit is available for $57.00

Maxim Integrated | www.maximintegrated.com

 

PMICs Enable Optimized Power for Automotive ADAS

Maxim Integrated Products has announced a series of power-management ICs (PMICs)  that enable designers to optimize power for automotive advanced driver-assistance systems (ADAS) functions to achieve high performance, small size, efficiency and electrical protection.

ADAS functions, many of which are now mandatory or will be soon, increase vehicle safety and enhance the driving experience. These features include smart braking for collision avoidance, GPS/navigation, adaptive cruise control, lane centering, lane-departure warning, and back-up/surround video. Although these functions receive considerable design attention, managing DC power in electrically harsh vehicle environments is a less-publicized yet critical challenge which involves significant issues of functions, features, performance, efficiency and footprint.
Maxim’s array of application-optimized ICs, which manage DC power, solve the top-level designer pain points for various ADAS functions involving a combination of package size, operating efficiency, quiescent current, electrical protection, and EMI generation.

The series of PMICs which Maxim has released include:

MAX20019 Dual Synchronous Step-Down Converter—Provides the industry’s smallest 3.2MHz dual step-down power supply in a 2mm × 3mm package size (compared to the closest competing solutions that offer single channel parts in either a 2mm x 2mm or 3mm x 3mm package size)

MAX20087 Quad Camera Power Protector—ASIL-grade camera module protector IC includes an I2C interface to report on over/undervoltage/fault conditions; monitors up to four 600 mA coax channels and isolates faults from individual camera modules

MAX20075 and MAX20076 Synchronous Step-Down Converters—Offer the industry’s lowest quiescent current with peak and valley mode options; provide a high peak efficiency of 91% for always-on applications compared to competing solutions, while featuring a 40 V load-dump tolerance

MAX20014 Triple-Output Converter—Features one synchronous boost and two synchronous step-down converters for smaller, simpler, and lower cost designs (competing approaches require two ICs plus discrete components); features 2.2 MHz switching frequency and spread-spectrum capability for reduced EMI and comes in a small 4 mm x 4 mm package size

Maxim Integrated | www.maximintegrated.com

Multiphase 12-A DC-DC Buck Converter

Dialog Semiconductor recently announced the DA9210-A power management IC (PMIC). A multiphase, automotive-grade, 12A DC-DC buck converter, the DA9210-A supplies the high current core rails of microprocessor devices. Designed for automotive applications, the DA9210-A is optimized for the supply of CPUs and GPUs and can support load currents of up to 12 A in single-chip configuration and 24 A in dual parallel configuration.

The PMIC’s features, benefits, and specs:

  • High efficiency over a wide output range
  • Accepts input voltages from 2.8 to 5.5 VDC
  • Delivers an output voltage between 0.3 and 1.57 V, with ±2.5% output voltage accuracy
  • 3-MHz nominal switching frequency
  • Fully AEC-Q100 grade 3 qualified
  • 42 WL-CSP package

Source: Dialog Semiconductor