L5973D013TR Integrated Circuits (ICs)

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1. Description

The L5973D013TR is a step down monolithic power switching regulator with a minimum switch current limit of 2.5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(j-amb) down to approximately 40 °C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all computer related applications. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

2. Features

    1. 2.5 A internal switch

    2. Operating input voltage from 4 V to 36 V

    3. 3.3 V / (±2%) reference voltage

    4. Output voltage adjustable from 1.235 V to 35 V

    5. Low dropout operation: 100% duty cycle

    6. 250 kHz internally fixed frequency

    7. Voltage feedforward

    8. Zero load current operation

    9. Internal current limiting

  10. Inhibit for zero current consumption

  11. Synchronization

  12. Protection against feedback disconnection

  13. Thermal shutdown

3. Applications

    1. Consumer: STB, DVD, TV, VCR, car radio, LCD monitors

    2. Networking: XDSL, modems, DC-DC modules

    3. Computer: printers, audio/graphic cards, optical storage, hard disk drive

    4. Industrial: changers, car battery, DC-DC converters

4. Pin configuration

5. Pin description