IC category

MAX1726x – Maxim Integrated fuel-gauge IC family

Maxim Integrated has developed an algorithm to accurately estimate the battery state of charge and safely handle most batteries.

Designers of lithium-ion (Li-ion) battery-powered mobile devices such as wearables, electric bicycles, power tools and internet of things (IoT) products can improve the end-user experience by extending run-time and delivering accurate battery state-of-charge (SOC) data with the MAX1726x fuel-gauge IC family from Maxim Integrated. The low power fuel gauge ICs implement Maxim ModelGauge™ m5 EZ algorithm. The ModelGauge m5 EZ algorithm makes fuel gauge implementation easy by eliminating battery characterization requirements and simplifying host software interaction.

Key advantages

  • High Accuracy: The ICs provide accurate time-to-empty (1%) and time-to-full SOC data across a wide range of load conditions and temperatures, using the proven ModelGauge m5 algorithm
  • Fast Time to Market: The ModelGauge m5 EZ algorithm eliminates the time-consuming battery-characterization and calibration process
  • Extended Run-Time: Quiescent current of just 5.1µA for MAX17260/1; 5.2µA for the MAX17262 and 8.2µA for MAX17263 extends run-time
  • Integration: The MAX17262 includes the Rsense current resistor (voltage and coulomb counting hybrid) which reduces overall footprint and BOM cost, eases board layout
  • Small size: At 1.5mm × 1.5mm IC size, the MAX17262 implementation is 30 percent smaller in size compared to using a discrete sense resistor with an alternate fuel gauge; at 3mm × 3mm, MAX17263 is the smallest in its class for lithium-ion-powered devices
  • LED Support: The single-/multi-cell MAX17263 also drives LEDs to indicate battery status on a pushbutton press or system status on system microcontroller commands

ModelGauge m5 EZ algorithm

The ModelGauge m5 EZ algorithm makes fuel gauge implementation easy by eliminating battery characterization requirements and simplifying host software interaction. The algorithm provides tolerance against battery diversity for most lithium batteries and applications. The algorithm combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltagebased fuel gauge, along with temperature compensation to provide industry-leading fuel gauge accuracy.

The IC automatically compensates for cell-aging, temperature, discharge rate, and provides accurate state-of-charge (SOC) in percentage (%) and remaining capacity in milliampere-hours (mAh) over a wide range of operating conditions. As the battery approaches the critical region near empty, the algorithm invokes a special correction mechanism that eliminates any error. The IC provides accurate estimation of time-to-empty and time-to-full and provides three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

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4-channel voltage supervisors accurate to ±0.5%

Analog Devices’ LTC2962-LTC2964 family of 4-channel voltage supervisors has been designed with exceptional accuracy for increased system voltage margin and enhanced reliability. [via]

ASIC, FPGA, DSP, MCU and MPU architectures that operate from supplies as low as 1V cannot utilize traditional 1%-2% accurate voltage supervisors without shedding valuable system voltage margin and shrinking the remaining load operating voltage range. The LTC2962 family possesses a best-in-class ±0.5% reset threshold accuracy, which relaxes power supply demands, increases system tolerance to transients, and enabling a lower nominal supply to dramatically reduce power consumption. The LTC2962 family fulfills many network, telecom and automotive requirements with its high accuracy, flexible 1V to 5V (or adjustable) reset thresholds, and wide operating temperature range. For each channel, one of 16 preset or adjustable, ±0.5% accurate, voltage thresholds can be selected for undervoltage, overvoltage or negative monitoring. The supervisory circuits monitor inputs and drive the outputs according to the configured thresholds. Alternatively, a manual reset input is also available for optional use of a pushbutton switch to force a system reset. The devices come in multiple temperature grades: 0°C to 70°C (C grade), –40°C to 85°C (I grade), and –40°C to 125°C (H grade), in a 16-lead 3x3mm QFN or 20-lead 3x4mm QFN package.

Analog Devices – www.analog.com

Nexperia’s 74AUP1Txx & 74LV1Txxx logic families

Nexperia’s 74AUP1Txx & 74LV1Txxx logic families provide solutions that integrate voltage level translation with a Boolean function.

74AUP1Txx & 74LV1Txxx types are single supply general-purpose voltage-translating devices, respectively operating in the 2.3 V to 3.6 V and 1.6 V to 5.5 V supply range. This wide Vcc range allows the interconnection between most logic level signals. Both logic families are composed of ten logic functions including buffers, inverters and gates (AND, OR, NAND, NOR, EXCLUSIVE-OR, EXCLUSIVE-NOR).

Key Features

  • Up and down translation possible
  • Overvoltage tolerant inputs
  • Up to 50 MHz operation at 3.3 V


  • Portable devices
  • Industrial controllers
  • Servers, PC & Notebooks
  • Automotive

more information: www.avnet.com

AEM10941 – Photovoltaic Energy Harvesting Power Management IC

E-peas’ photovoltaic energy harvesting IC solution – AEM10941 – is the next generation integrated energy management subsystem that extracts DC power from up to 7 cells solar panels to simultaneously store energy in a rechargeable element and supply the system with two independent regulated voltages. This allows product designers and engineers to extend battery lifetime and ultimately get rid of the primary energy storage element in a large range of wireless applications like industrial monitoring, home automation, wearables.

The AEM10941 harvests the available input current up to 125 mA. It integrates an ultra-low-power Boost converter to charge a storage element, such as a Li-Ion battery, a thin film battery or a super- or conventional capacitor. The Boost converter operates with input voltages in a range of 50 mV to 5V. With its unique cold-start circuit, it can start operating with empty storage elements at an input voltage as low as 380 mV and an input power of just 3 µW.

The low voltage supply typically drives a microcontroller at 1.8 V. The high voltage supply typically drives a radio transceiver at a configurable voltage. Both are driven by highly efficient LDO (Low Drop-Out) regulators for low noise and high stability.

more -> https://e-peas.com/products/energy-harvesting/photovoltaic/aem10941/

Back-up power manager can support two supercapacitors

A complete supercapacitor back-up power management system for 2.9 to 5.5V supply rails is available from Analog Devices.

The LTC4041 uses an on-chip bi-directional synchronous converter to provide high efficiency step-down supercapacitor charging. There is also high current, high efficiency boost back-up power. When external power is available, the device operates as a step-down battery charger for one or two supercapacitor cells, giving preference to the system load. When the input supply drops below the adjustable power-fail input (PFI) threshold, the LTC4041 switches to step-up regulator operation, capable of delivering up to 2.5A to the system load from the supercapacitor. During a power fail event, its PowerPath control provides reverse blocking and a seamless switchover from input power to back-up power.

Typical applications for the LTC4041 include ride-through so-called “dying gasp” supplies, high current ride-through 3.0 to 5.0V uninterruptible power supplies (UPS), power meters, industrial alarms, servers and solid state drives (SSDs).

The LTC4041 includes an optional over-voltage protection (OVP) function using an external FET which can protect the IC from input voltages greater than 60V. An internal supercapacitor balancing circuit maintains equal voltages across each supercapacitor and limits the maximum voltage of each supercapacitor to a predetermined value. Its adjustable input current limit function enables operation from a current limited source while prioritising system load current over battery charge current.  An external disconnect switch isolates the primary input supply from the system during back-up. The device also includes input current monitoring, an input power fail indicator, and a system power fail indicator.

The LTC4041 is offered in a low profile (0.75mm) 24-lead 4.0 x 5.0mm QFN package with backside metal pad for excellent thermal performance. The device operates from -40 to +125 degrees C, in both E and I grades.


Integrated battery charger has optional power point tracking

An integrated, high voltage multi-chemistry synchronous monolithic step-down battery charger and PowerPath manager with onboard telemetry functions and optional maximum power point tracking (MPPT) has been announced by Analog Devices. The Power by Linear LTC4162 is 3.2A, 35VIN/35VOUT synchronous monolithic multi-chemistry PowerPath manager/charger with digital I2C telemetry and MPPT operation.

The LTC4162 transfers power from a variety of input sources, such as wall adapters, backplanes and solar panels, to charge a Li-Ion/polymer, LiFePO4 or lead-acid battery stack and provide power to a system load up to 35V. The device provides advanced system monitoring and PowerPath management, plus battery health monitoring. A host microcontroller is required to access the most advanced features of the LTC4162, although the use of the I2C port is optional, says ADI.

The main charging features of the product can be adjusted using pin-strap configurations and programming resistors. The device offers precision ± five per cent charge current regulation up to 3.2A, ±0.75 per cent charge voltage regulation and operates over a 4.5 to 35V input voltage range. Applications include portable medical instruments, USB power delivery (one to five devices), military equipment, industrial handhelds and ruggedised notebook or tablet computers.

The LTC4162 contains a 16-bit analogue-to-digital converter (ADC) that continuously monitors system parameters on command, including input voltage, input current, battery voltage, battery current, output voltage, battery temperature, die temperature and battery series resistance (BSR). All system parameters can be monitored via a two-wire I2C interface, while programmable and maskable alerts ensure that only the information of interest causes an interrupt.

The active maximum power point tracking algorithm globally sweeps an input under-voltage control loop and selects an operating point to maximise power extraction from solar panels and other resistive sources. The LTC4162’s PowerPath topology decouples the output voltage from the battery, thereby allowing a portable product to start-up instantly when a charging source is applied under very low battery voltage conditions.

The LTC4162’s on-board charging profiles are optimised for each of a variety of battery chemistries, including Li-Ion/polymer, LiFePO4 and lead acid. Both charge voltage and charge current can be automatically adjusted based on battery temperature to comply with JEITA guidelines, or custom settings.

The LTC4162 is housed in a 28-lead, 4.0 x 5.0mm QFN package with an exposed metal pad for excellent thermal performance. E- and I-grade devices are guaranteed for operation from –40 to +125 degree C.


Hybrid Synchronous Step-Down Controller

The LTC7821, an industry first hybrid step-down synchronous controller that merges a switched capacitor circuit with a synchronous step-down controller, enables up to a 50% reduction in DC/DC converter size compared to traditional solutions.

The LTC7821 uses a proprietary architecture that merges a soft switching charge pump topology with a synchro- nous step-down converter to provide superior efficiency and EMI performance compared to traditional switching architectures.


Low profile regulator has digital power system management

Available as either a dual 10A or single 20A thin uModule regulator, the LTM4686 has a PMBus interface and is housed in a 16 x 11.9 x 1.82mm LGA package.

The Power by Linear regulator’s low height allows the it to be placed on a PC board very close to its load such as an FPGA or ASIC, while sharing one heat sink covering both low profile packages. The package allows the LTM4686 to be mounted on the back of a PCB, freeing top space for components such as memory and transceiver ICs, explains Analog Devices. This makes the LTM4686 suitable for height-restricted applications such as rack-mounted telecomms switches and routers, raid systems, and test and measurement equipment.

The PMBus interface enables users to measure and alter key power parameters such as voltage, load current and temperature. Users can also program sequencing, fault thresholds and responses via PMBus, storing values and fault log data in the onboard EEPROM.

The LTM4686 operates from 4.5 to 17V and the LTM4686-1 operates from 2.375 to 17V input supplies. The modules regulate an output from 0.5 to 3.6V with ±0.5 per cent maximum DC output error over temperature, – 40 to +125 degree C.  They deliver 80 per cent efficiency at 12VIN to 1.0VOUT at a full load condition and can deliver 18A from a 5VIN to a 1VOUT at 85 degree C ambient with 400LFM air flow. There is also current mode control in a parallel configuration, to deliver increased output current. Internal switching frequency is settable from 250kHz to 1MHz and can be synchronised to an external clock from 250kHz to 1MHz for noise-sensitive applications.

The LTM4686 configurable offers protection features, including over-voltage and under-voltage, over-current and over-temperature. If a fault occurs, data is saved automatically to the EEPROM, and the fault log can be retrieved over an I2C interface, where it can then be analysed, advises Analog Devices. The LTpowerPlay GUI DC1613 USB-to-PMBus converter VDC2086 programing adapter and demo kits are available to evaluate the performance of the LTM4686.


AOZ128x EZBuck™ Simple Buck (Step-Down) Regulators

Alpha & Omega’s high efficiency and simple to use regulators are designed for automotive, telecom, and networking equipment

Alpha & Omega Semiconductor’s AOZ128x series are high efficiency, simple, step-down regulators ranging from 0.6 A to 4 A of continuous output current. These EZBuck regulators work from a 3 V to 36 V input range depending on the device. They also offer an adjustable output voltage down to 0.8 V. The fixed switching frequency of 1 MHz PWM operation in the AOZ1282 and 1.5 MHz PWM operation in the AOZ1281 allow for a reduced inductor size, while the AOZ1284 offers a switching frequency of 200 kHz to 2 MHz with an external resistor. The AOZ1284 also offers an integrated N-channel high-side power MOSFET.

These regulators feature internal soft start as well as an adjustable soft start (AOZ1284). The devices support fault protection including thermal shutdown, short-circuit protection, and cycle-by-cycle current limit. The EZBuck series are offered in SOT23-6L, DFN 2×2, and EPAD SO-8 packages making them ideal for automotive, telecom, and networking equipment.


  • 3.0 V to 36 V operating input voltage range
  • 0.6 A to 4.0 A continuous output current
  • Up to 95% efficiency
  • Adjustable output voltage range from 0.8 V to 30 V
  • Cycle-by-cycle current limit
  • Short-circuit protection
  • Overvoltage protection
  • Overtemperature protection
  • Adjustable switching frequency from 200 kHz to 2 MHz (AOZ1284)
  • Internal soft start
  • Available in SOT23-6L, DFN 2×2, and EPAD SO-8 packages


Microchip’s MCP1640 – Super-Effective Battery Power

Designers working on line-powered systems are in luck…

Designers working on line-powered systems are in luck; whilst wasting power is always bad, a few mA of waste don’t really matter. When working on battery powered systems, every bit of energy helps – an efficient switching regulator can be helpful in various ways.

First of all, the holy grail of battery powered systems is connecting your electronics directly to the battery. Controllers with a wide input range can “float” around the battery voltage, thereby eliminating switching losses completely. Sadly, this is not always possible – LCD modules and various other elements demand fixed voltages or tight voltage ranges.

In this case, a highly efficient voltage regulator can be valuable. Microchip’s MCP1640 boasts with a 96% conversion rate, and furthermore it comes with a power-saving shutdown mode as shown in figure A.

Due to the high switching frequency – the PWM modules work at 500KhZ – the inductors required are small; their weight is comparable with that of SMD resistors, thereby ensuring “minimal grief” when used in surface-mount form factors. […continue reading]