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High-Frequency Multitopology PWM Controller from TI Eases System Design in Low Voltage Applications
DALLAS, (Dec. 11, 2001) -- A multitopology high-frequency BiCMOS Pulse Width Modulation (PWM) controller from Texas Instruments (TI) (NYSE: TXN) is revolutionizing the industry with operating frequencies of two megahertz (MHz) in highly efficient, synchronous rectification DC/DC power conversion. High frequency operation results in smaller magnetic and capacitive components, minimizing over-all part count and enabling a flexible, easy-to-use system power solution. The IC is ideal for battery-powered portable equipment, such as satellite and cellular phones, digital cameras, PDAs and GPS devices. Non-portable applications include distributed power and point of load, DC/DC power conversion for networking equipment, servers, base stations, and merchant and OEM power systems. (See power.ti.com/aap7217u).
The TPS43000 regulates buck, boost, SEPIC and flyback topologies. Handling input voltages as low as two alkaline or nickel batteries (1.8V) through 9.0V, the device controls output voltages in the 0.8V to 8.0V range. External P and N channel power MOSFETs are driven directly by the IC's fast, high current gate drive outputs. The supply current is 1mA operating at 500kHz, whereas sleep mode consumes only 100uA and complete shutdown draws only 1uA. Moreover, over-all part count is kept low resulting in an extremely flexible and easy-to-use system power solution. The high level of flexibility and features of this part make it ideal for portable and non-portable communications applications.
The TPS43000 features selectable pulse-by-pulse current limiting or hiccup mode overcurrent protection to handle an overload. Additionally, the device's soft start is programmable along with continuous or discontinuous conduction mode of operation. Undervoltage lockout keeps the controller idle until a 1.6V input threshold is reached, and 150mV of hysteresis facilitates smooth startups. The TPS43000 can be programmed for synchronizeable fixed frequency operation or Pulse Frequency Modulation (PFM) to achieve the lowest possible power consumption.
Availability, Packaging and Pricing
The TPS43000 is available now from TI and its authorized distributors. It is housed in a compact, low profile 16-pin TSSOP surface mount power package. Suggested resale pricing in quantities of 1,000 is $2.75.
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