LM46001AQPWPRQ1

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1. Describe

The LM46001AQPWPRQ1 regulator is an easy-to-use regulator Synchronous step-down DC-DC converters can Drives up to 1 A load current from input voltage The range is 3.5 V to 60 V. LM46001-Q1 provides excellent efficiency, output accuracy and Dropout voltage in very small solution sizes. one Extended series offers 0.5A and 2A loads Pin-to-pin compatible with current options in the package. Peak current mode control is used to achieve Simple control loop compensation and cycle-by-cycle limit. optional features such as Programmable switching frequency, synchronization, Power Good Flag, Precision Enable, Internal Soft-Start, Scalable soft-start and tracking provide flexible and easy-to-use platform for a variety of application. Discontinuous conduction and automatic Reduce light load frequency Increase light load efficiency. The home hardly needs the outdoors components and pinout allow simple, Optimum PCB layout. Protection features include Thermal Shutdown, VCC Under Voltage Lockout, Cycle-by-Cycle Current Limit, and Output Short-Circuit Protect. The LM46001-Q1 device is available in 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm) with a lead pitch of 0.65 mm. this The device is pin-to-pin compatible with the LM4360x and LM4600x series. The LM46001A-Q1 version is Optimized for PFM operation and recommended for new design.

2. Feature

    1. Compliant with automotive application requirements

    2. AEC-Q100 certified with the following results:

        – Device Temperature Grade 1: –40°C to +125°C Operating Junction Temperature

    3. 24µA quiescent current regulation

    4. High efficiency at light loads (DCM and PFM)

    5. Tested to EN55022/CISPR 22 EMI standards

    6. Integrated synchronous rectification

    7. Adjustable frequency range: 200 kHz to 2.2 MHz (500 kHz default)

    8. Synchronized to external clock frequency

    9. Internal compensation

  10. Stable with almost any ceramic combination, Polymer, Tantalum and Aluminum Capacitors

  11. Power Good sign

  12. Soft-start for pre-biased loads

  13. Internal soft-start: 4.1 ms

  14. Use external capacitors to extend soft-start time

  15. Output voltage tracking capability

  16. Precise enable for programming system UVLO

  17. Output short circuit protection with hiccup mode

  18. Thermal shutdown protection from overheating

  19. Create custom designs using the LM46001-Q1 Using WEBENCH® Power Designer

3. Application

    1. Sub AM band 12 V and 24 V automotive

    2. Telecommunications systems 

    3. Commercial vehicle power

    4. Universal wide input voltage regulation

    5. Efficient point-of-load regulation

4. Function Description

The LM46001AQPWPRQ1 is a step-down buck regulator switching switch (synchronous rectifier) integration with a high-side (HS) switch and a low-side (LS) switch. The LM46001-Q1 provides a regulated output voltage by turning on HS and LS NMOS switches with controllable on-time. During the on-time of the HS switch, the SW pin voltage VSW swings to approximately VIN and the inductor current IL increases with a linear slope of (VIN – VOUT) / L. When the HS switch is turned off by the control logic, the LS switch is turned on after the shoot-through dead time. The inductor current is discharged through the LS switch with a slope of -VOUT/L. The control parameter of the buck converter is defined as the duty cycle D = tON / TSW, where tON is the HS switch on-time and TSW is the switching period. The regulator control loop maintains a constant output voltage by adjusting the duty cycle D. In an ideal buck converter, losses are ignored and D is proportional to the output voltage and inversely proportional to the input voltage: D = VOUT / VIN. The LM46001-Q1 synchronous buck converter uses a peak current mode control topology. A voltage feedback loop is used to obtain accurate DC voltage regulation by adjusting the peak current command based on the voltage offset. The peak inductor current is sensed from the HS switch and compared to the peak current to control the on time of the HS switch. The voltage feedback loop is internally compensated for fewer external components, ease of design, and stable operation with virtually any output capacitor combination. The regulator operates at a fixed switching frequency in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). At very light loads, the LM46001-Q1 operates in PFM to maintain high efficiency, and the switching frequency decreases as the load current decreases. 

5. Application Information

The LM46001AQPWPRQ1 is a step-down DC-DC regulator. It is typically used to convert higher DC voltages to lower DC voltages with a maximum output current of 1 A. The following design procedure selects the components of the LM46001-Q1. Alternatively, complete designs can be generated using WEBENCH® software. When generating designs, WEBENCH® software utilizes an iterative design process and accesses Comprehensive component database. and detailed design procedures for more information.