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Thursday, February 06, 2003
TI's New Power Mux Family Simplifies Switching Between Battery and External Power Sources in Single-Cell Li-Ion Applications
New Multiplexers Reduce Voltage Drop to 0.05V
DALLAS, Feb. 6 -- Texas Instruments Incorporated (NYSE: TXN - News; TI) today introduced a family of ultra-low rDS(on) power switches that enables seamless transition between two power sources, such as a single-cell lithium-ion (Li-Ion) battery and a wall adapter. Ideal for mobile phones, personal digital assistants (PDAs) and other handhelds, the controlled output voltage transition times of the new devices allow for a seamless supply transition without requiring a large output (hold-up) capacitor. Designers of mobile applications can now achieve a voltage drop of less than 0.05V at 300mA for higher efficiency and longer battery life, compared to the 0.3V - 0.7V drop seen in a typical two-diode "OR" connection implementation. (See: power.ti.com/sc03030.)
Designed to maximize power efficiency, TI's TPS211x family of two-input, one-output power multiplexers has two internal high-side power metal-oxide semiconductor field-effect transistors (MOSFETs) with rDS(on) as low as 84mOhms typical (TPS2111/3/5) to 120mOhms typical (TPS2110/2/4).
The series of devices, which operates from 2.8V to 5.5V and delivers up to 1A, offers a comprehensive set of features and options to simplify design and provide added flexibility. Select devices have manual switching capabilities using the D0 and D1 control lines, as well as an "autoswitching" mode where the switchover is automatically set to the higher input voltage, or determined by a voltage threshold set by an external resistor divider if the device features an adjustable threshold.
Additional Features:
- Low Standby Current (0.5 uA Typ)
- Low Operating Current (55 uA Typ)
- Switch Status Output Option
- User-Programmable Current Limiting from 0.31A to 1.25A
- Thermal Protection
- Inrush Current Control
Cross-Conduction and Reverse-Conduction Blocking
Availability, Packaging and Pricing
TI's TPS211x family of two-input, one-output power multiplexers are available now from Texas Instruments and its authorized distributors in an eight-pin thin shrink small outline package (TSSOP). Suggested resale pricing for the TPS211x in quantities of 1,000 units is $0.70. Features for the devices in the family are shown in the following table.
Part Number Switching Adjustable Adjustable Switch Status
Current Limit Voltage
Threshold
TPS2110 Manual and Yes Yes No
Automatic
0.31-A to 0.75-A 0.8V to 5.0V
TPS2111 Manual and Yes Yes No
Automatic
0.625-A to 1.25-A 0.8V to 5.0V
TPS2112 Automatic Yes Yes Yes
0.31-A to 0.75-A 0.8V to 5.0V
TPS2113 Automatic Yes Yes Yes
0.625-A to 1.25-A 0.8V to 5.0V
TPS2114 Manual and Yes No Yes
Automatic
0.31-A to 0.75-A
TPS2115 Manual and Yes No Yes
Automatic
0.625-A to 1.25-A
Texas Instruments Incorporated is the world leader in digital signal processing and analog technologies, the semiconductor engines of the Internet age. The company's businesses also include sensors and controls, and educational and productivity solutions. TI is headquartered in Dallas, Texas, and has manufacturing or sales operations in more than 25 countries.
Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at: http://www.ti.com.
Source: Texas Instruments Incorporated
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