News & Events
Intersil Launches Industry's Smallest and Most Advanced Li+Battery Charger IC for Handheld Devices
-- Offers tiny 3 X 3 mm DFN package, highest thermal efficiency with full protection~-- Accepts multiple power sources ranging from voltage and current-limited wall plug modules to USB~-- Utilizes Intersil's AnyAdapter technology and Thermaguard protection to ensure flexibility and reliability
Intersil Corporation (Nasdaq:ISIL), a world leader in the design and manufacture of high performance analog and wireless networking solutions, today announced the industry's smallest and most advanced Li-ion/Li-polymer battery charger IC, the AnyAdapter ISL6292. Designed for a wide range of portable device applications, this next-generation charger IC saves valuable board space in its near-chip-scale 3 X 3 mm Dual Flat No-lead (DFN) package while offering the industry's highest thermal efficiency along with full voltage protection, current protection and Intersil's Thermaguard temperature-controlled charge- rate protection. What's more, the ISL6292 AnyAdapter charger IC accepts a wide range of voltage sources including voltage and current-limited wall-plug modules and USB bus power.
The AnyAdapter ISL6292 operates as a linear charger when the AC adapter is a voltage source by charging the cell in a constant-current (CC) then constant-voltage (CV) profile. Charge current is resistor programmable up to a maximum of 2 A. The ISL6292 also works with a current-limited adapter to minimize thermal dissipation, in which case, the IC operates as a linear charger but offers the thermal efficiency typically found only with pulse or switching chargers. Pulse and switching charger topologies generate considerable noise when compared with the ISL6292 charger's linear topology, making the ISL6292 ideally suited to noise sensitive applications such as smart phones and PDA's with embedded wireless. Intersil's AnyAdapter technology enables up to an astounding 750% less thermal generation than competing solutions, thus allowing a significant reduction in charge time for similar operating conditions.
An internal and trimmed current-sense circuit guarantees 10% accuracy with no bulky external current-sense resistor. The constant voltage is either 4.1 V ( ISL6292-1CRX) or 4.2 V (ISL6292-2CRX) with 1% accuracy. The ISL6292 always preconditions the battery with 1/10 of the programmed charge current at the beginning of a charge cycle until it verifies that the battery can be fast- charged.
The ISL6292 utilizes Intersil's Thermaguard protection, which is a thermal- foldback feature that helps ensure safe operation, reduces design complexity and avoids premature charge termination invoked by the thermal shutdown feature of older-generation solutions. If the operating conditions, which include environment, charge source voltage and charge rate, cause the ISL6292 die temperature to approach a set limit, the internal temperature control activates which automatically reduces the charge current (folds it back) to a safe level to maintain a safe temperature. In so doing, the charge cycle can continue uninterrupted and without damage to the ISL6292. As the cell voltage increases with charge, the thermal control permits charge current to increase to shorten the charge cycle.
The ISL6292 provides a fully programmable end of charge indication point, but allows charging to continue until the safety timer automatically terminates charge. A typical Li-Ion cell will charge rather quickly to within a few percent of the maximum cell capacity, but the time required to "top off" the last few percent of remaining charge takes quite a bit longer. The ISL6292 provides the design engineer greater flexibility by allowing the system to indicate charge complete to the user in a shorter period of time, while providing maximum charge if the system remains connected to the input source for a longer period of time. The charger automatically recharges the battery when the cell voltage drops below a recharge threshold. A simple interface with an NTC thermistor avoids charging the cell outside a programmable temperature window.
Package options for the ISL6292-1CR and ISL6292-2CR include the 10-pad 3 X 3 mm DFN, the 16-pad 4 X 4 mm QFN and the 16-pad 5 X 5 QFN. All of these packages are thermally enhanced, offering low thermal resistance for heat transfer to the board. In addition, these packages save board space and offer easy assembly with no chance for bent leads. Lead-free versions of these packages are also available.
ISL6292 Technical Summary
- Vin range of 4.3 V to 6.5 V, 7 Vmax, guaranteed to operate at 2.65 V after startup
- AnyAdapter technology supports a wide variety of input sources, including voltage and current-limited wall-plug modules and USB bus power.
- Integrated linear pass element and charge current sensor
- No external reverse blocking diode required
- 4.1 or 4.2 V charge voltage with 1% voltage accuracy
- Resistor-programmable current limit up to 2.0 A
- Programmable end-of-charge current
- Thermaguard charge current thermal foldback control
- Simple interface for low-cost NTC thermistor to monitor cell temperature
- Preconditioning for overly discharged cells
- Ambient temperature range: -20 degrees C to 70 degrees C
- Thermally enhanced 3 X 3 mm DFN, 4 X 4 QFN and 5 X 5 mm QFN packages
All voltage and package options are available now.
| Part Number | Voltage | Package | Price each in 1ku quant. |
| ISL6292-1CR3 | 4.1 | 10-pad 3 X 3 mm DFN | $0.95 |
| ISL6292-2CR3 | 4.2 | 10-pad 3 X 3 mm DFN | $0.95 |
| ISL6292-1CR4 | 4.1 | 16-pad 4 X 4 mm QFN | $0.95 |
| ISL6292-2CR4 | 4.2 | 16-pad 4 X 4 mm QFN | $0.95 |
| ISL6292-1CR5 | 4.1 | 16-pad 5 X 5 mm QFN | $0.95 |
| ISL6292-2CR5 | 4.2 | 16-pad 5 X 5 mm QFN | $0.95 |
Intersil Corporation is a global semiconductor leader in the design and manufacture of high performance analog and wireless networking solutions. Intersil's product portfolios address four fast growing markets - flat panel displays, optical storage (CD and DVD recordable), power management and wireless networking. Intersil brings added customer value in providing complete silicon, software and reference design solutions to new products that enhance the computing experience for people wherever they live, work or travel. For more information about Intersil or to find out how to become a member of our winning team, visit the company's web site and career page at: www.intersil.com.
This release may include "forward looking statements" that are subject to risks and uncertainties. For information identifying economic, political, climatic, currency, regulatory, technological, competitive and some other important factors that could cause actual results to differ materially from those anticipated in the forward looking statements, see Intersil's Safe Harbor Forward Looking Statement disclaimer found at http://www.intersil.com/legal.asp, as well as Intersil's SEC filings as updated from time to time, found at http:// http://www.sec.gov. Thermaguard and AnyAdapter are trademarks of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
