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Texas Instruments LM25148/LM25148-Q1 Buck DC/DC Controller

Texas Instruments LM25148/LM25148-Q1 Synchronous Buck DC/DC Controller is a 42V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25148/LM25148-Q1 can be set up in interleaved mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5V, at nearly 100% duty cycle if needed.

The Texas Instruments LM25148/LM25148-Q1 has a unique EMI reduction feature known as a dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests. The LM25148-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Integrated EMI mitigation
    • Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
    • Optimized for CISPR 32 Class B requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5V to 42V
    • 1% accurate, fixed 3.3V, 5V, 12V, or adjustable output from 0.8V to 36V
    • 150°C maximum junction temperature
    • Lossless DCR or shunt current sensing
    • Shutdown mode current: 2.3µA
    • No-load sleep current: 9.5µA
    • Internal 3ms soft-start ramp
    • Stackable up to two phases
    • Advanced dropout with frequency foldback
    • Internal bootstrap diode
  • Switching frequency from 100kHz to 2.2MHz
    • SYNC in and SYNC out capability
    • Selectable PFM or FPWM modes
  • Inherent protection features for robust design
    • Internal hiccup mode overcurrent protection
    • ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Internal or external loop compensation
    • Thermal shutdown protection with hysteresis

Applications

  • Building automation
  • Industrial transport
  • Power delivery
  • Test and measurement
  • Aerospace and defense

Additional Resources

Typical Application Schematic

Schematic - Texas Instruments LM25148/LM25148-Q1 Buck DC/DC Controller

Related Development Tool

Texas Instruments LM25149-Q1EVM-2100 Controller Evaluation Module

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Published: 2022-03-09 | Updated: 2025-05-12