Battery Power - Fall 2015 - (Page 16)

New Products * ICs & Semiconductors Bidirectional Switches Protect One-Cell and Two-Cell Lithium Batteries During Charging Diodes, Inc. has introduced the DMN2014LHAB and DMN2011UFX. These dual N-channel enhancement mode MOSFETs provide compact, bi-directional low-loss switches for battery-charging circuits. End-markets include chargers for portable devices such as smartphones, tablets, cameras and media players, which use one-cell and two-cell lithium batteries. The DMN2014LHAB and DMN2011UFX are configured as dual common-drain MOSFETs and, when switched on, these devices allow bi-directional current flow for charging or operational use. When switched off they protect the battery by preventing over-charging or excessive current drain. With a 20 V breakdown rating, the DMN2014LHAB and DMN2011UFX also feature low on resistance, RDS(on) < 13 mΩ and < 9.5 mΩ, respectively, to reduce battery power loss in normal operation. A high maximum peak current up to 80 A allows the switch to briefly handle shortcircuit conditions before the protection circuitry kicks in, while a low gate threshold voltage (VGS(th) <1 V) ensures correct operation even with drive voltages as low as 1.8 V. The DMN2014LHAB is available in the 2 mm by 3 mm DFN2030 package and the DMN2011UFX in the 2 mm by 5 mm DFN2050, providing small form-factor solutions that allow designers to use the space saved for additional cells and increase the battery's mAh capacity. mm by 1.41 mm package, designers no longer have to compromise efficiency or form factor. The ISL9120 offers designers the flexibility to cover a variety of design needs by operating from a Vin of 1.8 V to 5.5 V and an adjustable output voltage from 1 V to 5.2 V. Its adaptive PFM operation with forced bypass mode and 2 A switches support both low load and high load currents with high efficiency, ensuring longer battery life and less heat buildup. The regulator also delivers 800 mA current with 2.5 V input and 3.3 V output. During system stay alive conditions when regulation is not required, the ISL9120 goes into forced bypass mode, which reduces power consumption to a miniscule quiescent current of less than 0.5 uA. The ISL9120 buck-boost regulator is available in 9-bump WLCSP and QFN packages, and is priced at $0.72 in 1,000 quantities. Two ISL9120 evaluation boards allow designers to evaluate device features and performance: The ISL9120IINEVZ (3.3 Vout) is priced at $74.45 and the ISL9120IIA-EVZ (adjustable Vout) is $73.35. High Efficiency Buck-Boost Regulator for Wearables And Other Mobile Devices Intersil Corp. has announced the ISL9120, a buck-boost switching regulator that enables efficient power management of system power supplies and peripherals such as Wi-Fi, Bluetooth, memory cards or LCD modules. Its adaptive current limit PFM architecture delivers efficiency up to 98 percent, while providing smooth transitions from buck-to-boost to prevent glitches in applications where light load efficiency and fast transient response are critical. A small form factor makes the ISL9120 well suited for the connected devices making up the Internet of Things (IoT) including wearables, smartphones, smart thermostats and pointof-sale devices that run on single-cell Li-ion or Li-polymer batteries, or two-cell alkaline, NiCd or NiMH batteries. With the pervasiveness of mobile devices and growing popularity of wearables, power designers are challenged to balance cost, form factor and power efficiency. Typical power solutions for wearables use three DC-DC regulators and three to five LDOs, which takes up valuable board space. LDOs also lack the high efficiency and reliability of a buck-boost regulator, sacrificing performance as well. For example, when LDOs are used to power peripherals in a system running on a Li-ion battery with the Vout near 3.3 V, a large burst current from the applications processor can cause the Vin to droop below the LDO regulation voltage, causing a memory reset or application shutdown. The ISL9120 buckboost switching regulator eliminates this problem by addressing a wider Vin range and providing boost to avoid low voltage glitches that can cause a battery brownout when the Vin droops below the output voltage. Requiring a single inductor and available in a 1.41 16 Battery Power * Fall 2015 Versatile Synchronous Buck Battery Charger Controller Offers Up to 20 A Charge Current, Multichemistry Operation and Digital Telemetry Linear Technology Corp. has introduced the LTC4015, a high voltage multichemistry synchronous step-down battery charger controller with onboard telemetry functions. The device efficiently transfers power from a variety of input sources, such as wall adapters and solar panels, to a Li-ion/polymer, LiFePO4 or lead-acid battery stack and system load up to 35 V. It provides system monitoring and management functionality, including battery coulomb counting and health monitoring. While a host microcontroller is required to access the most advanced features of the LTC4015, the use of an I²C port is optional. The main charging features of the product can be adjusted using pin-strap configurations and programming resistors. The device offers precision ±5 percent charge current regulation up to 20 A, ±0.5 percent charge voltage regulation and operation over a 4.5 V to 35 V input voltage range. Applications include portable medical instruments, military equipment, battery backup applications, industrial handhelds, industrial lighting, ruggedized notebooks/tablet computers, and remote www.BatteryPowerOnline.com http://www.BatteryPowerOnline.com

Table of Contents for the Digital Edition of Battery Power - Fall 2015

Real-Time Battery Modeling in HiL Testing of Battery Management Systems
Battery Second Use Offsets Electric Vehicle Expenses, Improves Grid Stability
2015 Battery Power Resource Guide
Batteries
Converters & Inverters
ICs & Semiconductors
Industry News
Calendar of Events
Marketplace

Battery Power - Fall 2015