SIMO PMICs Shrink Power Regulator Size in Half

Six new low-power power-management integrated circuits (PMICs) from Maxim Integrated Products are designed to reduce the power-management footprint by up to 50 percent for space-constrained products such as wearables, hearables, sensors, smart-home automation hubs and internet of things (IoT) devices. They increase the overall system efficiency by nine percent compared to the closest competitive solution, while also reducing heat dissipation, an important consideration for wearable products that make skin contact.
The unique control architecture in the MAX17270 (shown), MAX77278, MAX77640/MAX77641 and MAX77680/MAX77681 PMICs allows a single inductor to serve as the critical energy-storage element for multiple, independent DC-rail outputs. This allows engineers to reduce the number of bulky inductors in their designs, thereby improving efficiency, shrinking form factor and reducing heat dissipation. In addition, the low quiescent current of the PMICs plays an important role in extending battery life. With the intrinsic buck-boost operation of the PMICs, the power rails can operate over a battery’s entire range.

MAX17270: Smallest Size and Lowest Quiescent Current
At 50 percent smaller than previous-generation SIMO-only solutions, the MAX17270 SIMO buck-boost converter provides the industry’s smallest solution size while reducing the number of inductors and ICs that are required for a power tree. Its quiescent current of 850nA for one SIMO channel and 1.3µA for three SIMO channels is the lowest in the market and helps extend battery life of end devices. In addition, the product’s low power consumption prevents overheating and reduces frequent charging cycles for wearables and hearables. They are available in TQFN and WLP package options.

MAX77278: Power Path Charger Optimized for Small Li+ Batteries
This ultra-low-power SIMO PMIC provides three buck-boost regulators with independent voltage outputs (0.8VOUT to 5.25VOUT), 16µA operating quiescent current/300nA standby current and flexible power sequencing. The device is also a charger for small Li+ cells (7.5mA – 300mA CC range). It includes an adjustable 425mA current sink for an LED, eight general-purpose input/output (GPIO) pins and a 3.7125V to 5.3V, 50mA low-noise low-dropout regulator (LDO) with fixed headroom control in a total solution size as low as 24mm2. The PMIC’s I2C interface allows an applications processor to monitor the status and control power management. The MAX77278 is ideal for remote controls, health and fitness monitors, body cameras and IoT applications.

MAX77640/MAX77641: Highly Integrated Battery Charging and Power Solutions
These ultra-low-power SIMO PMICs feature three buck-boost regulators, a low-noise 150mA LDO, a GPIO output port, a triple current sink for an RGB LED array and flexible power sequencing. Operating current is just 5.6µA and shutdown current is 300nA. Available in a 16mm2 total solution size, the MAX77640 and MAX77641 are ideal for applications with a built-in charger in areas like wearables, fitness and health monitoring and IoT.

MAX77680/MAX77681: Mini PMICs for Always-On, Low-Power Applications
These ultra-low-power SIMO PMICs provide three buck-boost regulators, 3.0µA operating quiescent current, 300nA shutdown current and flexible power sequencing. Total solution size is only 15.5mm2. Given their feature set, the MAX77680 and MAX77681 are ideal for more minimalistic platforms that require streamlined resources, such as hearables (Bluetooth headsets/earbuds) and miniaturized IoT devices (rings, watches, e-pens).

The MAX17270 is available for $1.84 (1000-up, FOB USA); the MAX77278 is available for $2.18 (1000-up, FOB USA); the MAX77680 and MAX77681 are available for $1.24 (1000-up, FOB USA); and the MAX77640 and MAX77641 are available for $1.71 (1000-up, FOB USA) at Maxim’s website. The ICs are also available from select authorized distributors.

The MAX17270EVKIT# evaluation kit is available for $100; the MAX77278EVKIT# evaluation kit is available for $100; the MAX77680/MAX77681EVKIT# evaluation kit is available for $100; and the MAX77640/MAX77641EVKIT# is available for $100.

Maxim Integrated | www.maximintegrated.com

Power Management ICs Reduce Charge Times

Texas Instruments (TI) has introduced several new power management chips that enable designers to boost efficiency and shrink power supply and charger solution sizes for personal electronics and handheld industrial equipment. Operating at up to 1 MHz, TI’s new chipset combines the UCC28780 active clamp flyback controller and the UCC24612 synchronous rectifier controller to help cut the size of power supplies in AC/DC adapters and USB Power Delivery chargers in half. For battery-powered electronics that need maximum charging efficiency in a small solution size, TI also offers the bq25910. It is a 6-A three-level buck battery charger enables up to a 60% smaller-solution footprint in smartphones, tablets and electronic point-of-sale devices.

Designed to work with both gallium nitride (GaN) and silicon (Si) FETs, the UCC28780’s advanced and adaptive features enable the active clamp flyback topology to meet modern efficiency standards. With multimode control that changes the operation based on input and output conditions, pairing the UCC28780 with the UCC24612 can achieve and maintain high efficiency at full and light loads.

The chipset delivers efficient operation at up to 1 MHz, enabling a size reduction of 50% and higher power density than solutions today. Multimode control enables efficiency up to 95 percent at full loads and standby power of less than 40 mW, exceeding Code of Conduct (CoC) Tier 2 and U.S. Department of Energy (DoE) Level VI efficiency standards. For designs above 75 W, engineers can also pair the chipset with a new six-pin power-factor correction (PFC) controller, the UCC28056, which is optimized for light-load efficiency and low standby power consumption to achieve compliance with mandatory International Electrotechnical Commission (IEC)-61000-3-2 AC current harmonic limit regulations. Using features such as adaptive zero voltage switching (ZVS) control, engineers can easily design their systems with a combination of resistor settings and controller auto-tuning.

Leveraging an innovative three-level power-conversion technology, the bq25910 enables up to 50 percent faster charging compared to conventional architectures by dramatically reducing thermal loss. With integrated MOFSETs and lossless current sensing, the bq25910 reduces printed circuit board (PCB) space and allows designers to use small 0.33-µH inductors, saving even more space. The bq25910 enables 95 percent charging efficiency, which could take a standard smartphone battery from empty to 70 percent charged in less than 30 minutes. A differential battery-voltage sense line enables fast charging by bypassing parasitic resistance in the PCB for more accurate voltage measurements, even if the battery is placed away from the charger in the system.

Texas Instruments | www.ti.com