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L5988 Dataheets PDF



Part Number L5988
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description 4A step-down switching regulator
Datasheet L5988 DatasheetL5988 Datasheet (PDF)

www.DataSheet4U.com L5988 4A step-down switching regulator with synchronous rectification Preliminary Data Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 4A DC output current 2.9V to 18V input voltage Output voltage adjustable from 0.6V 400KHz switching frequency, programmable up to 1MHz Soft-start and inhibit 1.8V ± 2% reference voltage Low dropout operation: 100% duty cycle Voltage feed-forward Zero load current operation Sink current capability Over current, over voltage and thermal protection HTSSOP16 .

  L5988   L5988



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www.DataSheet4U.com L5988 4A step-down switching regulator with synchronous rectification Preliminary Data Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 4A DC output current 2.9V to 18V input voltage Output voltage adjustable from 0.6V 400KHz switching frequency, programmable up to 1MHz Soft-start and inhibit 1.8V ± 2% reference voltage Low dropout operation: 100% duty cycle Voltage feed-forward Zero load current operation Sink current capability Over current, over voltage and thermal protection HTSSOP16 package ■ ■ ■ HTSSOP16 Applications ■ Consumer: – STB, DVD, DVD recorder, TV, VCR, Car audio, LCD monitors Networking: – XDSL, Modems, DC-DC modules Computer: – Optical storage, Hard disk drive, Printers, Audio/Graphic cards Industrial: – Chargers, car battery, DC-DC converters Application circuit Order codes Part Number L5988D L5988DTR August 2006 Package HTSSOP16 HTSSOP16 Rev 3 Packaging Tube Tape and reel 1/10 10 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. www.st.com www.DataSheet4U.com Contents L5988 Contents 1 2 3 4 5 6 Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin connections and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2/10 www.DataSheet4U.com L5988 Technical characteristics 1 Technical characteristics The L5988D is a synchronous step down monolithic power switching regulator capable of delivering up to 4A. The input voltage can range from 2.9V to 18V. Thanks to the very short minimum ON time, the device is able to manage extremely low duty cycles, allowing very low output voltages. Requiring a minimum set of external components, the device includes an internal 400 KHz switching frequency oscillator that can be externally adjusted up to 1MHz. The regulator can provide 100% duty-cycle. A multifunction pin allows to enable-disable the sink mode current capability after soft-start, to enable-disable the latch mode for the OVP and to set the UVLO threshold for the 3.3V BUS and 12V BUS. The current limit can be externally adjusted to fit the application requirements. The current is sensed during both the on-time and the off-time and so the protection is effective with both very low or very high duty-cycle and/or with high switching frequency. The HTSSOP16 package with exposed pad allows reducing the RthJA to 40°C/W 3/10 www.DataSheet4U.com Pin connections and functions L5988 2 Figure 1. Pin connections and funct.


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