LMZ31707RVQT

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1. Describe

LMZ31707RVQT SIMPLE SWITCHER® Power Module is an easy-to-use integrated power solution, Combining a 7-A DC-DC converter with a power supply MOSFETs, Shielded Inductors and Passives Low profile, QFN package. This total power solution allows as few as three external components and Eliminate loop compensation and magnetic selection process. 10mm × 10mm × 4.3mm QFN package is simple soldered to the printed circuit board and allows Compact point-of-load design. reach greater than 95% Efficiency and Excellent Power Consumption A thermal impedance of 13.3°C/W can be achieved. this LMZ31707 offers flexibility and feature set Discrete point-of-load designs are ideal Power a variety of ICs and systems. Advanced packaging technology provides a robust and Reliable Power Solutions Compatible with Standard QFNs Installation and testing techniques.

2. Feature

    1. Complete integrated power solution enables small size, low profile design

    2. 10mm × 10mm × 4.3mm package

        – Pin compatible with LMZ31710 and LMZ31704

    3. Efficiency up to 95%

    4. Eco-mode™ / Light Load Efficiency (LLE)

    5. Wide output voltage regulation range from 0.6 V to 5.5 V with 1% reference accuracy

    6. Supports parallel operation for higher currents

    7. Optional split power rail allows input voltages as low as 2.95 V

    8. Adjustable switching frequency (200 kHz to 1.2 MHz)

    9. Synchronization with external clock

  10. Provide 180° out-of-phase clock signal

  11. Adjustable slow start

  12. Output voltage sequencing/tracking

  13. Power good output

  14. Programmable undervoltage lockout (UVLO)

  15. Overcurrent and overtemperature protection

  16. Pre-biased output start-up

  17. Operating temperature range: –40°C to +85°C

  18. Enhanced thermal performance: 13.3°C/W

  19. Complies with EN55022 Class B emission standards

        – Integrated shield inductor

3. Application

    1. Broadband and communications infrastructure

    2. Automated testing and medical equipment

    3. Compact PCI / PCI express / PXI express

    4. DSP and FPGA point-of-load applications

4. Pin configuration

5. Adjust the output voltage

The VADJ control sets the output voltage of the LMZ31707. Output voltage adjustment from 0.6 V to 5.5V. The adjustment method requires increasing RSET, which sets the output voltage, connecting SENSE+ to VOUT, and in some cases, RRT, which sets the switching frequency. The RSET resistor must be Connect directly between VADJ (pin 26) and AGND (pin 23). The SENSE+ pin (Pin 27) must be connected to VOUT or the load for improved regulation or to the VOUT of the device. The RRT resistor must be connected directly between RT/CLK (pin 22) and AGND (pin 23). The number of external RSET resistors for the common bus voltage, and the recommended RRT resistor for that output voltage.

6. Electrolytic, polymer electrolytic capacitors

When using electrolytic capacitors, it is recommended to use high-quality, computer-grade electrolytic capacitors. Polymer electrolytic capacitors are recommended for applications with ambient operating temperatures below 0°C. The Sanyo OS-CON capacitor series is recommended due to its lower ESR, higher surge rating, power dissipation, ripple current capability and small package size. For ambient temperatures above 0°C, aluminum electrolytic capacitors provide adequate decoupling in the frequency range from 2 kHz to 150 kHz.

7. Tantalum, polymer tantalum capacitors

Polymer tantalum capacitors are recommended for applications with ambient operating temperatures below 0°C. The Sanyo POSCAP series and Kemet T530 capacitor series are recommended for many other tantalum types due to their lower ESR, higher surge rating, power dissipation, ripple current capability and small package size. Tantalum capacitors without specified ESR or inrush current ratings are not recommended for power supply applications.

8. Output capacitor

The required output capacitance is determined by the output voltage of the LMZ31707. The effect of temperature and capacitor voltage rating must be considered when selecting a capacitor to meet the minimum capacitance required. The required output capacitance can consist of all ceramic capacitors or a combination of ceramic and bulk capacitors. The required capacitors must include at least one 47-µF ceramic. when adding additional non-ceramic bulk capacitors. Determine the required capacitance above the minimum value according to the requirements of the actual transient deviation.

9. Output On/Off Inhibit (INH)

The INH pin provides electrical on/off control of the device. Once the INH pin voltage exceeds the threshold voltage, the device starts to operate. If the INH pin voltage falls below the threshold voltage, the regulator will stop switching and enter a low quiescent current state. The INH pin has an internal pull-up current source, allowing the user to float the INH pin to enable the device. If the application requires control of the INH pin, use an open-drain/collector device or a suitable logic gate to connect to the pin. The device can be turned on and off by controlling the INH pin with a voltage superv If the input voltage source opposes the ramp up or down. Turning on Q1 applies a low voltage to the inhibit control (INH) pin and disables the power output.