ST's L5970 chip delivers output of 1A at 0.5V to 35V from SO8 package
 Geneva, February 26, 2001 - STMicroelectronics' (NYSE: STM) new L5970 single-chip stepdown switching regulator offers designers a balance between compactness, simplicity and efficiency, squeezing into an SO8 package a regulator that delivers 1A at 0.5V to 35V with very few external components.
Designed for distributed supply applications, the L5970's small size and simple application reduce the board area required while the high efficiency eliminates the need for heatsinks or cooling fans. As it operates on input voltages from 4.4V to 36V it is compatible with standard 5V bus systems.
An on-chip P-channel MOS power transistor, it allows conduction losses to be optimized even in applications where the duty cycle can exceed 95%. In addition, no bootstrap capacitor is required.
New design techniques and submicron power technology allow very high efficiency in overall output power conditioning, keeping the quiescent current below 2.5mA and standby current consumption in the range of 50uA. A high switching frequency, internally set at 250kHz, allows a considerable reduction in the size of the external LC filter components, further reducing the overall footprint of the supply. Higher switching frequencies can be obtained using external synchronization.
A frequency foldback function is also included in the device to prevent output overshoot during startup and limit the current to a constant value during short circuit conditions. Other functions included in the device are an inhibit function, a precise voltage reference, thermal shutdown and a synchronization pin that allows up to six devices to be synchronized.
About STMicroelectronics
STMicroelectronics (formerly SGS-THOMSON Microelectronics) is a global independent semiconductor company, whose shares are traded on the New York Stock Exchange, on the ParisBourse and on the Milan Stock Exchange. The Company designs, develops, manufactures and markets a broad range of semiconductor integrated circuits (ICs) and discrete devices used in a wide variety of microelectronic applications, including telecommunications systems, computer systems, consumer products, automotive products and industrial automation and control systems. In 2000, the Company's net revenues were $7,813.2 million and net earnings were $1,452.1 million. Further information on ST can be found at www.st.com.
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