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Texas Instruments LM5145-Q1 Synchronous Buck Controllers

Texas Instruments LM5145-Q1 Synchronous Buck Controllers are designed to regulate from a high input voltage source or an input rail subject to high voltage transients. This design minimizes the need for external surge suppression components. A high-side switch minimum on-time of 40ns facilitates large step-down ratios. This feature enables the direct step-down conversion from a 48V nominal input to low-voltage rails for reduced system complexity and solution cost. The Texas Instruments LM5145-Q1 continues to operate during input voltage dips as low as 6V, at nearly 100% duty cycle if needed. This option makes it well suited for high-performance industrial control, robotic, datacom, and RF power amplifier applications.

Features

  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient temperature range
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 5.5V to 75V
    • 150°C maximum junction temperature
    • 0.8V reference with ±1% feedback accuracy
    • Adjustable output voltage from 0.8V to 60V
    • 40ns tON(min) for a high VIN/VOUT ratio
    • 140ns tOFF(min) for low dropout
    • Lossless RDS(on) or shunt current sensing
    • Optimized for CISPR 25 Class 5 requirements
  • Switching frequency from 100kHz to 1MHz
    • SYNC in and SYNC out capability
    • Selectable diode emulation or FPWM
  • 7.5V gate drivers for standard VTH MOSFETs
    • 14ns adaptive dead-time control
    • 2.3A source and 3.5A sink capability
  • Inherent protection features for robust design
    • Adjustable output voltage soft start
    • Hiccup-mode overcurrent protection
    • Input UVLO with hysteresis
    • VCC and gate-drive UVLO protection
    • Precision enable input and open-drain PGOOD indicator for sequencing and control
    • Thermal shutdown protection with hysteresis
  • 20-pin VQFN package with wettable flanks

Applications

  • Remote Radio Unit (RRU) and BTS
  • Networking and Computing Power
  • Non-Isolated PoE and IP Cameras
  • Industrial Motor Drives

Videos

Typical Application Circuit

Application Circuit Diagram - Texas Instruments LM5145-Q1 Synchronous Buck Controllers

Evaluation Module

Texas Instruments LM5145EVM-HD-20A Buck Controller EVM

Designed to showcase the performance of the LM5145, a synchronous buck DC-DC buck controller.

Learn Moreabout Texas Instruments LM5145EVM-HD-20A Buck Controller EVM View Productsrelated to Texas Instruments LM5145EVM-HD-20A Buck Controller EVM
Published: 2017-08-04 | Updated: 2022-06-15