TI LM5143QRWGRQ1

The LM5143-Q1 is a 65V synchronous buck DC/DC controller for high-current single or dual outputs. The device employs an interleaved, stackable peak current mode control architecture that provides simple loop compensation, fast transient response, excellent load and line regulation, and precise current sharing via paralleled phases for high output current. The 65ns ultra-short high-side switch on-time enables high step-down ratios, supporting direct conversion from 12V, 24V, or 48V automotive inputs to low-voltage rails, reducing system complexity and solution cost. The LM5143-Q1 continues to operate at up to nearly 100% duty cycle as required when the input voltage drops to 3.5V. Inductor DCR current sensing delivers ultra-high efficiency, while shunt resistor sensing is available for high accuracy. A 15μA no-load quiescent current with regulated output voltage extends battery-powered system run time. Powering the LM5143-Q1 from a switching regulator output or other available supply reduces input quiescent current and power loss. Meeting CISPR 25 and automotive EMI requirements is simplified through a rich feature set. Adaptive timing, high-current MOSFET gate drivers with adjustable slew rate control minimize body diode conduction during switching transitions, reducing switching losses and improving thermal and EMI performance at high input voltages and switching frequencies. 180° interleaved operation between the two outputs reduces input capacitor ripple current and EMI filter size. A 90° out-of-phase clock output supports cascaded, multi-channel, or multiphase power stages. Resistor-adjustable switching frequency up to 2.2MHz can be synchronized to an external clock source up to 2.5MHz, eliminating beat frequencies in noise-sensitive applications. Optional triangular spread spectrum modulation further improves the EMI signature. Additional features of the LM5143-Q1 include a 150°C maximum junction operating temperature, user-selectable diode emulation for reduced current consumption under light-load conditions, configurable soft-start, an open-drain power-good flag for fault reporting and output monitoring, independent enable inputs, monotonic startup into pre-biased loads, integrated VCC bias supply regulator, programmable hiccup-mode overload protection, and thermal shutdown with auto-recovery. The LM5143-Q1 controller is available in a 6mm × 6mm thermally enhanced 40-pin VQFNP package with wettable flank leads for optical inspection during manufacturing.

• AEC-Q100 qualified for automotive applications: Device Temperature Grade 1: -40°C to +125°C ambient operating temperature range
• Functional Safety (FuSa) version available
• Documentation to support functional safety system design; versatile synchronous buck DC/DC controller
• Wide input voltage range: 3.5V to 65V
• 1% accuracy, 3.3V/5V fixed or 0.6V to 55V adjustable output voltage
• 150°C maximum junction temperature
• Shutdown mode current: 4μA (typical)
• No-load standby current: 15μA (typical)
• Two interleaved synchronous buck channels
• Dual-channel or single-output multiphase operation
• 65ns tON(min) for high VIN/VOUT ratio
• 60ns tOFF(min) for low dropout operation
• Inherent protection features for robust design

• Automotive electronic systems
• Infotainment systems
• Instrument clusters
• Advanced Driver Assistance Systems (ADAS)