LMR36503-Q1

• AEC-Q100-qualified for automotive applications:
  • Device temperature grade 1: –40°C to +125°C, T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• >70% efficiency at 5 mA
  • 4 µA I_Q (switching) at 24 V_IN to 3.3 V_OUT (fixed output option)
• Miniature solution size and low component cost
  • 2-mm × 2-mm HotRod™ package with wettable flanks
  • Internal compensation
• Designed for automotive applications:
  • Junction temperature range –40°C to +150°C
  • Pseudo-random spread spectrum compatible with CISPR 25 EMI standard
  • Wide input voltage range: 3.0 V (falling threshold) to 65 V
  • Adjustable, 3.3-V and 5-V fixed output voltage options available
  • Synchronizable with MODE/SYNC pin variant
  • Adjustable F_SW: 200 kHz to 2.2 MHz with RT pin variant
  • Pin compatible with LMR36506-Q1 (65 V, 600 mA)

All trademarks are the property of their respective owners.

The LMR36503-Q1 is the industry’s smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2-mm x 2-mm HotRod™ package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 3.3 V, 5 V and other adjustable output voltages.

The LMR36503-Q1 uses peak current mode control architecture with internal compensation and maintains stable operation with minimal output capacitance. The wide input operating range of the LMR36503-Q1 helps it remain functional during a deep input voltage sag condition, making it an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503-Q1 provides precise indication of the output voltage status, eliminating the requirement for an external supervisor. A seamless transition from FPWM to PFM, with an ultra-low standby quiescent current allows the LMR36503-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503-Q1 to an external clock. With the right resistor selection, the LMR36503-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503-Q1 is designed to simplify implementation for a wide range of automotive end equipments.