SNVSCV0 September   2024 LM5137F-Q1

ADVANCE INFORMATION  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Device Comparison Table
  6. 5Device and Documentation Support
    1. 5.1 Device Support
      1. 5.1.1 Third-Party Products Disclaimer
      2. 5.1.2 Development Support
        1. 5.1.2.1 Custom Design With WEBENCH® Tools
    2. 5.2 Documentation Support
      1. 5.2.1 Related Documentation
        1. 5.2.1.1 PCB Layout Resources
        2. 5.2.1.2 Thermal Design Resources
    3. 5.3 Receiving Notification of Documentation Updates
    4. 5.4 Support Resources
    5. 5.5 Trademarks
    6. 5.6 Electrostatic Discharge Caution
    7. 5.7 Glossary
  7. 6Revision History
  8. 7Mechanical, Packaging, and Orderable Information
    1. 7.1 Tape and Reel Information

3 Description

The LM5137F-Q1 is an 80V dual-channel buck controller offered frrom a family with three options for functional safety: Capable, ASIL B, or ASIL D. The device uses an interleaved, stackable, peak current-mode architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for high output current. A high-side switch minimum on-time of 15ns facilitates large step-down ratios, enabling the direct conversion from 12V, 24V or 48V automotive inputs to low-voltage rails for reduced system design cost and complexity. The LM5137F-Q1 continues operating during input voltage dips as low as 4V, at 100% duty cycle if needed.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
LM5137F-Q1 RHA (VQFN, 36) 6.0mm × 6.0mm
(1) For more information, see Section 7.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LM5137F-Q1 LM5137F-Q1 Dual-Output Buck Switching Regulator – Simplified Schematic LM5137F-Q1 Dual-Output Buck Switching Regulator – Simplified Schematic

Several features are included to simplify compliance with CISPR 25 and automotive EMI requirements. Adaptively timed, high-current MOSFET gate drivers minimize body diode conduction during switching transitions, reducing switching losses and improving thermal and EMI performance at high input voltage and high switching frequency. To reduce input capacitor ripple current and EMI filter size, 180° interleaved operation is provided for two outputs. A 90° out-of-phase clock output works well for cascaded, multi-channel or multiphase power stages. Resistor-adjustable switching frequency as high as 2.2MHz can be synchronized to an external clock source up to 2.5MHz to eliminate beat frequencies in noise-sensitive applications.

The 12.7μA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered automotive systems. Additional features of the LM5137F-Q1 include 150°C maximum junction temperature operation, user-selectable PFM mode for lower current consumption at light-load conditions, configurable soft-start functions, open-drain PG and FAULT flags for fault reporting and output monitoring, independent enable inputs, monotonic start-up into prebiased loads, integrated VCC bias supply regulator powered from VIN or BIAS1/VOUT1, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy.

The LM5137F-Q1 controller is qualified to AEC-Q100 grade 1 for automotive applications and comes in a 6mm × 6mm thermally-enhanced, 36-pin VQFN package with additional pin clearance for increased reliability and wettable flank pins to facilitate optical inspection during manufacturing. The wide input voltage range, low quiescent current consumption, high-temperature operation, cycle-by-cycle current limit, low EMI signature, and small design size provide an excellent point-of-load regulator solution for functional safety (FuSa) applications requiring enhanced robustness and durability.