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LM5148-Q1

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Automotive, 80-V synchronous buck DC/DC controller with ultra-low IQ

Product details

Vin (min) (V) 3.5 Vin (max) (V) 80 Vout (min) (V) 0.8 Vout (max) (V) 55 Iout (max) (A) 20 Iq (typ) (mA) 0.009 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 EMI features Spread Spectrum Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 2 Rating Automotive Control mode current mode Type Controller
Vin (min) (V) 3.5 Vin (max) (V) 80 Vout (min) (V) 0.8 Vout (max) (V) 55 Iout (max) (A) 20 Iq (typ) (mA) 0.009 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 2200 EMI features Spread Spectrum Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Load Disconnect, Output discharge, Phase Interleaving, Power good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 1 Number of phases 2 Rating Automotive Control mode current mode Type Controller
VQFN (RGY) 24 19.25 mm² 5.5 x 3.5
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Integrated EMI mitigation
    • Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
    • Optimized for CISPR 25 Class 5 requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
    • 150°C maximum junction temperature
    • Lossless DCR or shunt current sensing
    • Shutdown mode current of 2.3 µA
    • No-load sleep current of 9.5 µA
    • Internal soft-start ramp of 3 ms
    • Stackable up to two phases
    • Internal bootstrap diode
  • Switching frequency from 100 kHz to 2.2 MHz
    • 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
  • Create a custom design using the LM5148-Q1 with WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Integrated EMI mitigation
    • Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
    • Optimized for CISPR 25 Class 5 requirements
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 80 V
    • 1% accurate, fixed 3.3 V, 5 V, 12 V, or adjustable output from 0.8 V to 55 V
    • 150°C maximum junction temperature
    • Lossless DCR or shunt current sensing
    • Shutdown mode current of 2.3 µA
    • No-load sleep current of 9.5 µA
    • Internal soft-start ramp of 3 ms
    • Stackable up to two phases
    • Internal bootstrap diode
  • Switching frequency from 100 kHz to 2.2 MHz
    • 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
  • Create a custom design using the LM5148-Q1 with WEBENCH Power Designer

The LM5148-Q1 is a 80-V, 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 LM5148-Q1 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5148-Q1 has a unique EMI reduction feature known as 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.

Additional features of the LM5148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5148-Q1 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing.

The LM5148-Q1 is a 80-V, 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 LM5148-Q1 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.

The LM5148-Q1 has a unique EMI reduction feature known as 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.

Additional features of the LM5148-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM5148-Q1 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing.

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Technical documentation

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Type Title Date
* Data sheet LM5148-Q1 80-V, Automotive, Synchronous, Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum datasheet PDF | HTML 15 Feb 2023
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
Functional safety information LM5148-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 15 Feb 2023
User guide LM25149-Q1 EVM User's Guide (Rev. A) PDF | HTML 29 Apr 2022

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V to 36-V, low IQ, synchronous buck DC/DC controller evaluation module

The LM25149-Q1EVM-2100 high-density evaluation module (EVM) is designed to showcase the performance of the LM25149-Q1 high-performance, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 5.5 V to 36 V to deliver a fixed 5-V output with better than 1% (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM5149-Q1EVM-400 — LM5149-Q1 evaluation module, 72-V, low-IQ, synchronous buck DC/DC controller with active EMI filter

The LM5149-Q1EVM-400 high-density evaluation module (EVM) is designed to showcase the performance of the LM5149-Q1 high-performance, automotive, synchronous buck DC/DC buck controller. The EVM operates over a wide input voltage range of 15 V to 72 V to deliver a fixed 12-V output with better than (...)

User guide: PDF | HTML
Not available on TI.com
Calculation tool

LM5148-LM25148DESIGN-CALC — LM5148 and LM25148 controller quickstart design tool

Welcome to the quickstart design tool for the LM5148, LM5148-Q1, LM25148 and LM25148-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the above controller family. As such, the user can expeditiously arrive at an (...)
PCB layout

LM25149-Q1EVM-2100 PCB Layout Files

SNVR501.ZIP (1990 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

PMP23420 — Dual-phase interleaved synchronous buck converter reference design for 48V automotive applications

This reference design utilizes two LM5148-Q1 single-phase synchronous buck controllers configured as a dual-phase, interleaved, synchronous buck converter.  The converter generates a regulated 5V output capable of delivering a nominal 30A of current to the load, with a peak current capability (...)
Test report: PDF
Reference designs

PMP23392 — Dual-phase buck converter reference design using GaN FETs for 48V automotive applications

This reference design utilizes two LM5148-Q1 single-phase synchronous buck controllers and four LMG3100R017 GaN FETs configured as a dual-phase, interleaved, synchronous buck converter. The converter generates a regulated 5V output capable of delivering a nominal 30A of current to the load, with a (...)
Test report: PDF
Reference designs

PMP31252 — 150W dual phase synchronous buck converter reference design for automotive applications

This design showcases a low EMI, dual-phase buck converter that can be used as a dual-output converter. As a dual-phase converter, the circuit can provide a continuous output current of 22A with 30A peak in a 12V to 5V configuration.
Test report: PDF
Package Pins Download
VQFN (RGY) 24 View options

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