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LMZM33603 Datenblatt(PDF) 10 Page - Texas Instruments |
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LMZM33603 Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 36 page PGOOD VIN PGND SW VOUT RT AGND FB EN/SYNC PGOOD Logic + + VREF Comp Power Stage and Control Logic Thermal Shutdown Shutdown Logic OCP VIN UVLO Oscillator Soft Start Sync Detect Precision Enable Copyright © 2017, Texas Instruments Incorporated 6.8µH 10 LMZM33603 SNVSAO6C – SEPTEMBER 2017 – REVISED MARCH 2018 www.ti.com Product Folder Links: LMZM33603 Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LMZM33603 is a full-featured, 36-V input, 3-A, synchronous, step-down converter with PWM, MOSFETs, shielded inductor, and control circuitry integrated into a low-profile, overmolded package. The device integration enables small designs, while providing the ability to adjust key parameters to meet specific design requirements. The LMZM33603 provides an output voltage range of 1 V to 18 V. An external resistor divider is used to adjust the output voltage to the desired value. The switching frequency can also be adjusted, by either an external resistor or a sync signal, which allows the LMZM33603 to accommodate a variety of input and output voltage conditions as well as optimize efficiency. The device provides accurate voltage regulation over a wide load range by using a precision internal voltage reference. Input undervoltage lockout is internally set at 3.6 V (typical), but can be adjusted upward using a resistor divider on the EN/SYNC pin of the device. The EN/SYNC pin can also be pulled low to put the device into standby mode to reduce input quiescent current. A power-good signal is provided to indicate when the output is within its nominal voltage range. Thermal shutdown and current limit features protect the device during an overload condition. An 18-pin, QFN package that includes exposed bottom pads provides a thermally enhanced solution for space-constrained applications. 7.2 Functional Block Diagram |
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