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

DC-DC Power Regulator Eases Data Center Cooling Costs

Analog Devices (ADI) has expanded its suite of Power by Linear µModule regulators with the LTM4700 step-down DC/DC power regulator. The device features energy efficient performance that reduces data center infrastructure cooling requirements. Configured as dual 50 A or single 100A configuration, the power µModule’s packaging technology enables an increasing server density and boosts data center throughout and computational power with minimal impact on system size and cooling costs.

The LTM4700 µModule’s highly integrated, component-on-package design includes on-board memory, data conversion circuitry and digital interface, reducing it to nearly half the size of competing devices, according to ADI. Applications include cloud computing, high-speed computing and optical networking systems, communication infrastructure, and PCIe boards, as well as medical, industrial and test and measurement equipment.

The LTM4700 operates at 73°C using heatsink packaging technology. That’s much cooler compared to modular solutions from competitors which typically run at 90°C, says ADI. The device can deliver full 100 A at 12 VIN to 0.8 VOUT with 200 LFM air flow up to 70°C ambient temperature. Peak conversion efficiency at 12 VIN to 0.8 VOUT reaches 90%.  The µModule’s architecture also enables system designers to combine up to eight devices, delivering up to 800A of load current to meet the higher power needs of data center processors, including FPGAs, ASICs, GPUs and microcontrollers.

The LTM4700 operates from a 4.5 V to 16 V input range, with output voltages digitally controlled from 0.5 V to 1.8 V. Integrated A/D converters, D/A converters and EEPROM enable users to digitally monitor, record and control power parameters using an I²C PMBus interface. Switching frequency is synchronized to an external clock from 200 kHz to 1 MHz for noise-sensitive applications. The LTM4700 also has self- and load-protection features against fault conditions such as over- and undervoltage, overcurrent and overtemperature.

Summary of Features:

  • Dual 50 A or Single 100 A Digitally Adjustable Outputs with Digital Interface for Control, Compensation and Monitoring
  • Wide Input Voltage: 4.5 V to 16 V
  • Output Voltage Range: 0.5 V to 1. 8V
  • ~90% Full Load Efficiency from 12 VIN to 1 VOUT at 100 A
  • ±0.5% Maximum DC Output Error Over Temperature

Pricing for LTM4700 starts at $97.26 (1,000s) in a 15 mm x 22 mm x 7.87 mm BGA package.

Analog Devices | www.analog.com