LM5127-Q1

• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C to +125°C, T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• 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 I_Q 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 V_SUPPLY>V_LOAD (boost)
  • LDO operation when V_SUPPLY ≈ V_LOAD (buck)
• Minimized battery drain
  • Shutdown current ≤ 2.8 µA
  • Automatic transition to low-I_Q sleep mode
  • Battery drain in sleep
    • I_Q≤ 14 µA when 3.3-V buck on
    • I_Q≤ 22 µA when 3.3-V and 5-V bucks on
    • I_Q≤ 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)