LMZ23605TZX/NOPB

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1. Description

The LMZ23605TZX/NOPB SIMPLE SWITCHER® power module is an easy-to-use step-down DC – DC solution capable of driving up to 5-A load. The LMZ23605 is available in an innovative package that enhances thermal performance and allows for hand or machine soldering. The LMZ23605 can accept an input voltage rail between 6 V and 36 V and can deliver an adjustable and highly accurate output voltage as low as 0.8 V. The LMZ23605 only requires two external resistors and three external capacitors to complete the power solution. The LMZ23605 is a reliable and robust design with the following protection features: thermal shutdown, programmable input undervoltage lockout, output overvoltage protection, short circuit protection, output current limit, and the device allows start-up into a prebiased output. The sync input allows synchronization over the 650- to 950-kHz switching frequency range.

2. Features

    1. Integrated Shielded Inductor

    2. Simple PCB Layout

    3. Frequency Synchronization Input (650 kHz to 950 kHz)

    4. Flexible Start-up Sequencing Using External Soft-Start, Tracking and Precision Enable

    5. Protection Against Inrush Currents and Faults such as Input UVLO and Output Short Circuit

    6. Junction Temperature Range –40°C to +125°C

    7. Single Exposed Pad and Standard Pinout for Easy Mounting and Manufacturing

    8. Fast Transient Response for Powering FPGAs and ASICs

    9. Fully Enabled for WEBENCH® Power Designer

  10. Pin Compatible With LMZ22005/LMZ23603/LMZ22003

  11. Performance Benefits

        – High Efficiency Reduces System Heat Generation

        – Low Component Count, only 5 External Components

        – Low Output Voltage Ripple

        – Uses PCB as Heat Sink, no Airflow Required

  12. Electrical Specifications

        – 30-W Maximum Total Output Power

        – Up to 5-A Output Current 

        – Input Voltage Range 6 V to 36 V

        – Output Voltage Range 0.8 V to 6 V

        – Efficiency up to 92%

3. Applications

    1. Point-of-load Conversions from 12-V and 24-V Input Rail

    2. Time-Critical Projects

    3. Space Constrained / High Thermal Requirement Applications

    4. Negative Output Voltage Applications See Mounting and Manufacturing

4. Pin Configuration 

5. Pin Functions

6. Sync input

The PWM switching frequency can be synchronized with an external frequency source. If you don’t use this feature, Ground this input directly or through a resistor of 1.5 kΩ or less. Allowed The synchronization frequency range is 650 kHz to 950 kHz. The typical input threshold is 1.4V switching level. Ideally, the input clock must overdrive the threshold by 2 times, so it is directly driven from the 3.3-V logic through a 1.5-kΩ Thevenin source resistor is recommended.

7. Current limit

The LMZ23605 is protected by low-side (LS) and high-side (HS) current limit circuits. The LS current limit monitors the current flowing through the LS synchronous MOSFET and detects it during the turn-off period. When the top MOSFET is off, the inductor current flows through the load, the PGND pin and the internal synchronous MOSFET. If this current exceeds 5.4 A (typical), the current limit comparator disables the start of the next switching cycle. The switching cycle is prohibited until the current is below the limit. The DC current limit depends on two duty cycles. The HS current limit monitors the current of the top MOSFET. Once the HS current detects the limit (typical value is 7 A), the HS MOSFET is turned off immediately until the next cycle. Exceeding the HS current limit causes VO to drop. The typical behavior of exceeding the LS current limit is that fSW drops to 1/2 the operating frequency.

8. Thermal Protection

The junction temperature of LMZ23605 must not exceed its maximum rating. Thermal protection is implemented by an internal thermal shutdown circuit, which is activated at 165°C (typical value), causing the device to enter a low-power standby state. In this state, the main MOSFET remains off, causing VO to drop, and In addition, the CSS capacitor is discharged to ground. Thermal protection helps prevent catastrophic failure Unexpectedly, the device overheated. When the junction temperature drops below 150°C (typical hysteresis = 15°C) The SS pin is released, VO rises steadily, and normal operation resumes. Applications that require maximum output current, especially high input voltage applications, may require additional derating at elevated temperatures.

9. Pre-bias start

The LMZ23605 will start to the pre-biased output correctly. This startup situation is common in multi-track There may be logic applications of current paths between different power rails during the startup sequence. Trace one is to enable high. Trace 2 is 1.5V pre-bias rising To 3.3 V. Rise time determined by CSS, trajectory three.

10. Tracking supply allocator option

The tracking function allows the module to be connected to the main voltage rail as a slave power supply (usually 3.3-V system track), where the output voltage of the slave module outputs the voltage of the main module. 0.15 V typical). In the correct tracking mode under the same voltage, the correct setting in the tracking mode is that the soft time of the slave track is shorter than that of the master track; it is a condition that is easy to meet to start, because the CSS hat is sampled by the RTKB. , The input will no longer be allowed and the 50-µA internal current source is turned off.