Product details


Regulated outputs (#) 3 Vin (Min) (V) 0.8 Vin (Max) (V) 42 Iout (Max) (A) 30 Step-down DC/DC controller 2 Step-up DC/DC controller 1 Iq (Typ) (mA) 3 Features Channel 1 can be configured by the user as a boost, buck or SEPIC controller Operating temperature range (C) -40 to 150 Rating Automotive Shutdown current (Typ) (uA) 2.2 Configurability Hardware configurable, User programmable open-in-new Find other Multi-channel ICs (PMIC)

Package | Pins | Size

VQFN (RGZ) 48 49 mm² 7 x 7 VQFN (RGZ) 48 open-in-new Find other Multi-channel ICs (PMIC)


  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for various architectures and scalable
    • Triple-output synchronous controllers
    • Flexible topology
      • CH1: boost / buck topology
      • CH2, CH3: two single phase bucks / dual-phase interleaved buck topology
    • Enable pin and PGOOD indicator per channel
    • Optional low IQ battery monitor
  • Wide operating range for automotive applications
    • 3.8-V to 42-V input operating range
    • Minimum boost input 0.8 V when BIAS ≥ 3.8 V
    • Boost output: adjustable up to 42 V
    • Buck output: fixed 3.3 V, 5 V, or adj. 0.8 - 42 V
    • Bypass operation when VSUPPLY>VLOAD (boost)
    • LDO operation when VSUPPLY ≈ VLOAD (buck)
  • Minimized battery drain
    • Shutdown current ≤ 2.8 µA
    • Automatic transition to low-IQ sleep mode
    • Battery drain in sleep
      • IQ≤ 14 µA when 3.3-V buck on
      • IQ≤ 22 µA when 3.3-V and 5-V bucks on
      • IQ≤ 32 µA when 3.3-V, 5-V bucks on and boost in bypass
    • High efficiency using strong 5-V drivers
    • Dual input VCC and VDD regulators
  • Small and cost-effective solution
    • Maximum switching frequency 2.2 MHz
    • Internal boot diode (boost)
    • Constant peak current limit
    • Supports DCR inductor current sensing
    • QFN-48 with wettable flanks
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100 kHz to 2.2 MHz
    • Selectable switching mode (FPWM, diode emulation, and skip mode)
  • EMI mitigation
    • Optional programmable spread spectrum
  • Programmability and flexibility
    • Programmable wake-up and sleep threshold
    • Dynamic switching frequency programming
    • Adjustable soft start time
    • Adjustable output using 0.8 V ±1% reference
    • Adaptive dead-time control
  • Integrated protection features
    • Overcurrent protection
      • Cycle-by-cycle peak current limit
      • Optional hiccup mode protection (buck)
      • Optional latch-off mode protection (buck)
    • Overvoltage protection
    • HB-SW short protection (boost)
    • Thermal shutdown

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The LM5127-Q1 is a full featured, wide input range three channel DC/DC controller which supports flexible topology (Boost/Buck) with peak current mode control. The device is designed as an integrated one-chip solution for the front-stage power supply in automotive infotainment, cluster, body control as well as ADAS systems. (continue on next page)

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Technical documentation

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Type Title Date
* Data sheet LM5127-Q1 2.2-MHz Wide VIN Automotive Front-stage Multi-rail DC/DC datasheet (Rev. A) Dec. 17, 2020
User guide LM5127EVM-FLEX Evaluation Module (Rev. A) Dec. 16, 2020
Functional safety information LM5127-Q1 Functional Safety, FIT Rate and Failure Mode Distribution Dec. 11, 2020
Certificate LM5127EVM-FLEX EU RoHS Declaration of Conformity (DoC) (Rev. A) Nov. 25, 2020

Design & development

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

Hardware development

document-generic User guide
The LM5127EVM-FLEX showcases the features and performance of the LM5127-Q1 when configured with channel 1 as a pre-boost, and channel 2 and channel 3 configured as independent buck controllers. The input voltage range is 3V to 42V. The pre-boost can operate down to 3V during input transients (...)
  • Input voltage range: 3V to 42V
  • One pre-boost controller
  • Two buck controllers (5V at 5A), (3.3V at 7A)
  • Hiccup mode short circuit protection

Design tools & simulation

SLVMD93.ZIP (65 KB) - PSpice Model
SLVMD94.ZIP (69 KB) - PSpice Model
SLVMD95.ZIP (62 KB) - PSpice Model
SLVMD96.ZIP (114 KB) - PSpice Model
SLVMD97.ZIP (132 KB) - PSpice Model
SLVMD98.ZIP (156 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
VQFN (RGZ) 48 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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