LMR36503 Datasheet | Texas Instruments

Features - Designed for rugged industrial applications: - Junction temperature range - 40°C to +150°C - Input transient protection up to 70 V - Wide input voltage range: 3.0 V (falling threshold) to 65 V - Low EMI and minimized switch node ringing - Adjustable, 5-V fixed output voltage options available - Suited for scalable industrial power supplies: - Pin patible with LMR36506 (65 V, 600 m A) - Adjustable switching frequency: 200 k Hz to 2.2 MHz with RT pin variant - Minimized solution size and cost: - Highest power density with internal pensation and reduced external ponent count - Ultra-small, 2-mm × 2-mm Hot Rod™ package with wettable flanks available - High efficiency across load range with low power dissipation: - > 90% peak efficiency at 1 MHz (5 VOUT adjustable) - Ultra-low operating quiescent current at no load - 4 µA at 24 VIN to 3.3 VOUT (fixed output option) 2 Applications - Factory automation: field transmitters and process sensors - Building automation: HVAC and fire safety - Appliances: garden and power tools VIN CIN VIN EN/ UVLO BOOT SW CBOOT LIND VOUT COUT CVCC PGOOD FB GND RFBT RFBB Simplified Schematic 3 Description The LMR36503 is the industry smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2mm × 2-mm Hot Rod package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 5 V and other adjustable output voltages. The transient tolerance reduces the necessary design effort to protect against input overvoltage and meets the surge immunity requirements of IEC 61000-4-5. The LMR36503 uses the peak current mode control architecture with internal pensation to maintain stable operation with minimal output capacitance. The LMR36503 with the right resistor selection from the RT pin to ground can be externally programmed to any desired switching frequency of operation over a wide range from 200 k Hz to 2.2 MHz. The precision EN/UVLO feature allows precise...