LMZ31530RLGT

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1. Describe

The LMZ31530RLGT power module is an easy-to-use Integrated power solution combined with 30-A DC/DC converter with power MOSFET, shielded Inductors and passives into low profile, QFN pack. This total power solution allows as little as three external components and eliminates loops Compensation and magnetic component selection process. 15 × 16 × 5.8 mm, QFN package easily soldered to the printed circuit board and allows Compact point-of-load design. reach greater than 95% efficiency with ultra-fast load step response and Excellent power dissipation capability and thermal 8.6°C/W impedance. The LMZ31530 provides Flexibility and feature set of discrete point-of-load designs ideal for powering a wide range of Integrated circuits and systems. Advanced Packaging Technology Provide Robust and Reliable Power Solutions Compatible with standard QFN installation and testing Skill.

2. Feature

    1. Complete integrated power solution; smaller than discrete designs

    2. 15 mm × 16 mm × 5.8 mm package size

        - Pin compatible with LMZ31520

    3. Ultra-fast load step response

    4. Efficiency up to 96%

    5. Wide output voltage regulation 0.6 V to 3.6 V with 1% reference accuracy

    6. Optional split power rail allows Input voltage as low as 3V

    7. Selectable switching frequency; (300 kHz to 850 kHz)

    8. Optional slow start

    9. Adjustable overcurrent limit

  10. Power good output

  11. Output voltage sequencing

  12. Over temperature protection

  13. Pre-biased output start-up

  14. Operating temperature range: –40°C to 85°C

  15. Enhanced thermal performance: 8.6°C/W

  16. Complies with EN55022 Class A emissions

        - Integrated shielded inductor

  17. Create custom designs using the LMZ31530 Using WEBENCH® Power Designer

3. Application

    1. Broadband and communications infrastructure

    2. DSP and FPGA point-of-load applications

    3. High density power system

4. Pin configuration

5. Application Information

The VADJ control sets the output voltage of the LMZ31530. Output Voltage Regulation from 0.6V to 3.6V. The adjustment method requires adding RSET, which sets the output voltage, and connecting SENSE+ to VOUT. The RSET resistor must be connected directly between VADJ (pin 13) and AGND (pin 9). The SENSE+ pin (pin 14) must be connected to VOUT at the load for improved regulation or to a VOUT device. The LMZ31530 relies on a trimmed 0.6 V reference for feedback voltage regulation and is used to regulate the voltage ripple valleys that appear on the VADJ pin. Voltage ripple is a function of input voltage and output voltage, so the RSET resistor will vary according to the input voltage. External RSET resistors calculated for multiple common bus voltages with PVIN of 12 V, 5 V and 3.3 V. The recommended switching frequency is 500 kHz and can be configured by leaving the FREQ_SEL pin open. to adjust the frequency.

6. Frequency selection

The LMZ31530 switching frequency can be selected from several values. To select the switching frequency, a resistor (RFREQ) must be connected between the FREQ_SEL pin and PGND or V5V. The recommended switching frequency is 500 kHz for all output voltages, configurable by leaving the FREQ_SEL pin open. Table 2 also shows the frequency for each output voltage range.

7. Power-up characteristics

When configured as shown in the family schematic, the LMZ31530 will produce a regulated output voltage after a valid input voltage is applied. During power-up, the internal soft-start circuit slows down the rate The output voltage rises, limiting the amount of inrush current resources that can be drawn from the input. The startup waveform of LMZ31530, 12V input (PVIN=VIN), the output voltage is adjusted to 1.8V. The start-up wave that the LMZ31530 starts up forms a pre-biased output voltage. The waveforms are measured under a 15A constant current load.

8. Frequency selection

The LMZ31530 switching frequency can be selected from several values, as shown in Table 2. to choose one Switching frequency, a resistor (RFREQ) must be connected between the FREQ_SEL pin and PGND or V5V. The recommended switching frequency is 500 kHz for all output voltages, which It can be configured by leaving the FREQ_SEL pin open.