Current-Limited Load Switch simplifies hot swap management.
March 24, 2009 -
Designed to protect peripheral ports from short-circuit and over-voltage events, Model AAT4614 combines reverse current blocking with programmable current limit capability and integrated fault flag. Operating across input range of 2.4-5.5 V, P-Channel MOSFET Power Switch features typical RDS On of 130 mW and can be used in both 3 and 5 V systems. When input drops below 2.4 V, under-voltage lockout circuit automatically shuts down operation to avoid saturation.
AnalogicTech's Current-limited Load Switch Simplifies Hot Swap Management
Embedded Programmability, Reverse Blocking, Fault Flag Maximize Design Flexibility, Minimize System Footprint
SANTA CLARA, Calif., March 10 / -- Advanced Analogic Technologies, Inc. (AnalogicTech(TM)) (NASDAQ:AATI), a developer of power management integrated circuits, announced today the AAT4614, a new current-limited P-channel MOSFET power switch for high side load switching applications. Design to protect peripheral ports from short-circuit and over-voltage events, the new load switch combines reverse current blocking with programmable current limit capability and an integrated fault flag in a silicon footprint up to 30 percent smaller than traditional implementations.
"While designers of advanced portable systems with hot swap capabilities often need programmability to maximize protection, reverse blocking to control reverse current potentials and a fault flag to indicate over-current or over-temperature conditions, until now they could only add all three functions with a complex discrete approach," says CJ Zhang, product line vice president at AnalogicTech. "By integrating all three features into a single monolithic device, the AAT4614 offers designers the highest level of protection available for hot swap in a simple, seamless solution that requires up to one-third less board space than discrete alternatives."
Multiple Protection Features
Operating across an input range of 2.4V to 5.5V, the AAT4614 can be used in both 3V and 5V systems. When the input drops below 2.4V, an under-voltage lockout circuit automatically shuts down operation to avoid saturation.
To protect the device against large input currents which could cause the supply to fall out of regulation, this new load switch features an over current threshold which is programmable up to 1.6A via a resistor from SET to ground. A very fast 1 us current limit transient response reduces the requirements for local supply bypassing.
The AAT4614 adds a reverse current blocking capability to protect the device from reverse current potentials when disabled. In addition, the device features an open drain FAULT flag to indicate an over-current or over-temperature condition. A 4ms blanking time prevents false reporting during charge of a capacitive load.
The AAT4614 also features an R(DS(ON)) of 130 milliohm typical.
To conserve power, quiescent current on the AAT4614 is only 10 uA. In shutdown mode, supply current decreases to < 1 uA. The new switch also features an over-temperature protection circuit that automatically switches the device off if die temperature exceeds a pre-defined limit.
Price and Availability
Qualified over a -40 degrees to +85 degrees C temperature range, the AAT4614 is available in a Pb-free 8-pin SC70JW, a 6-pin SOT23 or a 5-pin SOT23 package. It sells for $0.49 in 1K quantities.
About AnalogicTech
Advanced Analogic Technologies, Inc. (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for a variety of consumer, communications, and computing systems. The company focuses its design and marketing efforts on the application-specific power management needs of such devices as mobile handsets, smartphones, digital cameras, netbooks / notebooks, personal navigation systems, and wireless LANs. AnalogicTech also develops and licenses device, process, package, and application-related technologies. AnalogicTech is headquartered in Santa Clara, CA and Macau, S.A.R., with offices in China, Hong Kong, Taiwan, Japan, Korea, and the U.K., as well as a worldwide network of sales reps and distributors. The company is listed on NASDAQ under the symbol AATI. For more information, please visit www.analogictech.com. (AnalogicTech - G)
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: Karolien Cools-Wittry of AnalogicTech, +1-408-737-4600, Karoliencw (at) analogictech.com
Public Relations:
Quint Public Relations
Matthew Quint
USA
Phone: 650-599-9450 E-mail this person
General Information:
Karolien Cools-Wittry
USA
Phone: 408-737-4600 E-mail this person Company Information: Name: Advanced Analogic Technologies Inc. Address: 830 E. Arques Ave. City: Sunnyvale State: CA ZIP: 94085 Country: USA Phone: 408-737-4600 FAX: 408-737-4611 http://www.analogictech.com
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