Step-down converter with linear bypass supports multimode PAs in mobile handsets
February 18, 2011 // Paul Buckley
Maxim Integrated Products has introduced a step-down converter designed to power PA (power amplifier) modules in mobile phones. The company claims the MAX8989 is first DC-DC converter in the industry to support power management for multiple communication protocols (e.g., LTE, WCDMA, GSM, and EDGE).
The device is ideal for converged (multimode) PAs which is a solution utilized in Infineon’s proven SMARTi UE2 RF engine platform, which delivers unparalleled flexibility and efficiency to multistandard cellular phone systems.
The MAX8989 integrates a high-efficiency switching regulator with a parallel bypass LDO to guarantee maximum efficiency under all conditions. The approach enables designers to minimize the amount of power dissipated within the PA by regulating the PA’s output stage supply voltage. By controlling the PA supply voltage to meet transmission-power requirements, designers can extend 2G talk time by up to 25% and 3G talk time by up to 10%.
The integrated LDO serves to smooth the transition between step-down regulation and operation in dropout, allowing for a seamless transition to higher power levels. When in dropout, the LDO becomes a low-impedance (85 milliohm) bypass FET to ensure minimal power loss during periods of peak current demand. Additionally, the switching regulator is capable of a 100% duty cycle to further eliminate losses.
The MAX8989 supports up to 2.5 A, making it an excellent choice for powering GSM/EDGE PAs. The device is fully specified over the -40 to +85 degrees Celsius extended temperature range, and offered in a compact (1.6 mm × 1.6 mm, 0.69 mm max height), 9-bump wafer-level package (WLP). Prices start at $1.92 (1000-up, FOB USA). Samples and evaluation kits are available upon request.
More information about the MAX8989 step-down converter at
Visit Maxim Integrated Products at www.maxim-ic.com
Opening up the IoT data flood gates
November 21, 2014
Only a few days after their LoRa long range communication demo at electronica, IBM and Semtech are making the LoRa MAC protocol ...
Polarizing filter reduces energy drain from smartphone displays
From warm to cool white: colour-temperature tunable LEDs
System provides high-volume solution for flexible OLED displays
Isabellenhütte diversifies channels, clientele
SiRFusion enables accurate indoor location without new infrastructure
November 20, 2014
Indoor location has been a challenge to smartphone app developers and many ideas have been presented from Bluetooth beacons ...
EnOcean eyes the consumer market
Can Fool's gold reduce the cost of solar cells?
Nature constants: How variable are they really?
- Halogen-free options and increased performance for terminal blocks
- Wireless Power User Guide
- Secure is the New Smart
- 5 Best Practices for Designing Flexible Test Stations
InterviewFreescale CEO: 'IoT isn't just buzz'
Coming after the solid third quarter results that produced higher operating margins and improving cash flow, Freescale Semiconductor's CEO Gregg Lowe had every reason to be chipper and lively when EE Times ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Cherry is giving away five of its Energy Harvesting Evaluation kits, worth over 266 Euros each, for EETimes Europe's readers to win. Cherry's energy harvesting technology benefit mostly applications where a complex wire assembly and/or batteries would be inappropriate.
The required RF-energy is created by the mechanical actuation of the switch and the data is transmitted...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.