Super Capacitor Charger IC minimizes charge time.
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Press Release Summary:
Offered in Pb-free 12-pin TSOPJW package, AAT4620 is P-channel current-limited MOSFET power switch for high-side load switching applications in PC modem cards. It integrates all circuitry required to limit current, protect PC Card connector, continuously charge capacitor, and notify system when it is ready for use. Along with integrated reverse blocking protection, IC features current limiting, which lets capacitor charge until it reaches 98% of its final value.
Original Press Release:
AnalogicTech Introduces First Integrated Super Capacitor Charger IC
Embedded Power Loop Minimizes Capacitor Charge Time for PC Card, USB and CF Card Applications
SUNNYVALE, Calif., May 16 -- Advanced Analogic Technologies Incorporated (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced today the AAT4620, a P-channel current-limited MOSFET power switch for high-side load-switching applications in PC modem cards. Integrating all the circuitry required to limit current, protect the PC Card connector, continuously charge the capacitor, and notify the system when it is ready for use, this new device ensures that a Super Capacitor, typically used to average out high pulse currents, can be quickly charged without exceeding the host power supply specifications.
"Typically designers use a smart switch or MOSFET with a whole host of additional circuitry to create this function," says Phil Dewsbury, product line director for AnalogicTech. "By combining a P-channel MOSFET current switch with two independent current limits, a power loop, reverse blocking and a system ready pin in a tiny 12-pin TSOPJW package, the AAT4620 ensures the Super Capacitor is charged as quickly as possible without violating the host power specification, while reducing component count and board space requirements."
Regulated die temperature
The AAT4620 offers two independent, programmable current limits to control current during host/card negotiation. As long as thermal dissipation is low, the integrated current limiting will allow the capacitor to charge until it reaches 98% of its final value. Set by two external resistors, the current limits support 10 % +/- accuracy over the normal operating temperature range.
An integrated digital power loop automatically monitors and reduces the charging current to a safe level when high levels of charge result in excessive temperature and threaten to send the chip into thermal shutdown. By regulating charge current and therefore die temperature, this circuit ensures the super capacitor charges continuously and as quickly as possible.
Integrated reverse blocking protection prevents discharge of the Super Capacitor to the power supply. A system-ready output pin with externally programmable hysteresis alerts the system when the super capacitor is fully charged and ready for use.
The AAT4620 also features a quiescent current of only 40 uA typical. In shutdown mode, the supply current drops to 1 uA.
Price and availability
The device is available in a Pb-free, 12-pin TSOPJW package and specified across the -40 degrees to +85 degrees C temperature range. It sells for $1.34 each in 1,000 piece quantities.
About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier of power management semiconductors for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, and digital audio players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech is headquartered in Sunnyvale, California, with offices in Beijing, Hong Kong, Japan, Shanghai, Shenzhen, South Korea, Sweden, United Kingdom, France and Taiwan, as well as a worldwide network of sales representatives and distributors. For more information, please visit the AnalogicTech website: www.analogictech.com.
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
CONTACT: Phil Dewsbury of AnalogicTech, +1-408-737-4600, or pdewsbury@analogictech.com; or Matthew Quint of Quint Public Relations, +1-650-599-9450, or mquint@quintpr.com
