company blog about Supply Automotive Chips LM51551QDSSRQ1, LM5155QDSSRQ1 Non-synchronous Boost Controller

Supply Automotive Chips LM51551QDSSRQ1, LM5155QDSSRQ1 2.2 MHz Wide VIN, 1.5 A MOSFET Driver, Non-Synchronous Boost Controller, Hiccup Mode Protection

Description
The LM51551QDSSRQ1 and LM5155QDSSRQ1 are wide input range, non-synchronous boost controllers with peak current mode control. The devices can be used in boost, SEPIC, and flyback topologies.

The LM5155x-Q1 can be started from a single cell battery with a minimum voltage of 2.97 V if the BIAS pin is connected to the VCC pin. If the BIAS pin is greater than 3.5 V, it can operate with input supply voltages as low as 1.5 V.

Features

• Certified to AEC-Q100 for automotive applications
• Temperature Class 1: -40°C to +125°C T A
• Supports functional safety
• Documentation available to assist in the design of functionally safe systems
• Wide input operating range for automotive and portable battery applications
• 3.5 V to 45 V operating range
• 2.97 V to 16 V when BIAS = VCC
• 1.5 V minimum boost supply voltage when BIAS ≥ 3.5 V
• Input transient protection up to 50 V
• Minimal battery consumption
• Low shutdown current (I Q ≤ 2.6 µA)
• Low operating current (I Q ≤ 480 µA)
• Low solution size and cost
• Maximum switching frequency of 2.2 MHz
• 12-pin WSON package (3 mm × 2 mm) with wettable and non-wettable flanking options
• Integrated error amplifier for primary-side regulation without optocoupler (flyback)
• Minimized undershoot during cranking (start-stop applications)
• Higher efficiency and lower power consumption
• 100-mV ±7% low current limit threshold
• Powerful 1.5-A peak standard MOSFET driver
• Supports external VCC supply
• Avoids AM band interference and crosstalk
• Optional clock synchronization
• Dynamically programmable switching frequency (100 kHz to 2.2 MHz)
• Integrated protection features
• Constant peak current limit at input voltage
• Optional hiccup mode short-circuit protection (see device cross-reference)
• Programmable line UVLO
• OVP protection
• Thermal shutdown
• Feedback reference with ±1% accuracy
• Programmable additional slope compensation
• Adjustable soft start
• PGOOD indicator
• Create Customized Designs with the LM5155x and WEBENCH Power Designs

Applications

• Automotive start-stop applications
• High Voltage LIDAR Power Supplies
• Multi-Output Flyback Applications without Optocouplers
• Automotive Tail Light LED Bias Power Supplies
• Wide Input Boost, SEPIC and Flyback Power Modules
• Portable Speaker Applications
• Battery Powered Boost, SEPIC and Flyback Applications

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