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LMR36503E-Q1

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Automotive 3V to 65V, 0.3A buck converter

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Data sheet

LMR36503E-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Operating temperature range (°C) -40 to 175 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 0.3 Vin (min) (V) 3 Vin (max) (V) 65 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Vout (min) (V) 1 Vout (max) (V) 28 Iq (typ) (µA) 4 Duty cycle (max) (%) 99
Rating Automotive Operating temperature range (°C) -40 to 175 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 0.3 Vin (min) (V) 3 Vin (max) (V) 65 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Vout (min) (V) 1 Vout (max) (V) 28 Iq (typ) (µA) 4 Duty cycle (max) (%) 99
VQFN-HR (RPE) 9 4 mm² 2 x 2
  • AEC-Q100-qualified for automotive applications:
    • Device temperature grade 0: –40°C to +150°C, TA
  • > 70% efficiency at 5mA
    • 4µA IQ (switching) at 24VIN to 3.3VOUT (fixed output option)
  • Miniature design size and low component cost
    • 2mm × 2mm HotRod™ package with wettable flanks
    • Internal compensation
  • Designed for automotive applications:
  • Create a custom design using the LMR36503E-Q1 with the WEBENCH Power Designer
  • AEC-Q100-qualified for automotive applications:
    • Device temperature grade 0: –40°C to +150°C, TA
  • > 70% efficiency at 5mA
    • 4µA IQ (switching) at 24VIN to 3.3VOUT (fixed output option)
  • Miniature design size and low component cost
    • 2mm × 2mm HotRod™ package with wettable flanks
    • Internal compensation
  • Designed for automotive applications:
  • Create a custom design using the LMR36503E-Q1 with the WEBENCH Power Designer

The LMR36503E-Q1 is a 65V, 0.3A synchronous step-down DC/DC converter in 2mm × 2mm HotRod package. This easy-to-use converter can handle input voltage transients up to 70V, provide excellent EMI performance, and support fixed 3.3V, 5V and other adjustable output voltages.

The LMR36503E-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 LMR36503E-Q1 helps the device remain functional during a deep input voltage sag condition, making the device an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503E-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 LMR36503E-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503E-Q1 to an external clock. With the right resistor selection, the LMR36503E-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503E-Q1 is designed to simplify implementation for a wide range of automotive end equipments.

The LMR36503E-Q1 is a 65V, 0.3A synchronous step-down DC/DC converter in 2mm × 2mm HotRod package. This easy-to-use converter can handle input voltage transients up to 70V, provide excellent EMI performance, and support fixed 3.3V, 5V and other adjustable output voltages.

The LMR36503E-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 LMR36503E-Q1 helps the device remain functional during a deep input voltage sag condition, making the device an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503E-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 LMR36503E-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503E-Q1 to an external clock. With the right resistor selection, the LMR36503E-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503E-Q1 is designed to simplify implementation for a wide range of automotive end equipments.
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Type Title Date
* Data sheet LMR36503E-Q1 3V to 65V, 0.3A , Automotive, Grade 0, Synchronous Buck Converter Optimized for Size and Light Load Efficiency datasheet 19 Jun 2024
Functional safety information LMR36503E-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 13 Jun 2024
EVM User's guide LMR36503MSCE Evaluation Module User's Guide PDF | HTML 03 Jun 2024

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMR36503MSCEEVM — LMR360503E-Q1 evaluation module 

The LMR36503E-Q1 is a 65V DC/DC, 0.3A buck regulator that features synchronous rectification to achieve high conversion efficiency in a small footprint. The LMR36503E-Q1 evaluation module (EVM) operates over a wide input voltage range of 5.5V to 65V to provide a regulated 5V output up to 0.3A load (...)

User guide: PDF | HTML
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Simulation model

LMR36503MSC-Q1 PSpice Unencrypted Transient Model

SNVMC16.ZIP (528 KB) - PSpice Model
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Simulation model

LMR36503MSC3-Q1 PSpice Unencrypted Transient Model

SNVMC17.ZIP (530 KB) - PSpice Model
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Simulation model

LMR36503RS3-Q1 PSpice Unencrypted Transient Model

SNVMC26.ZIP (517 KB) - PSpice Model
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Calculation tool

LMR36503E-Q1-CALC — LMR36503, LMR36503-Q1, LMR36503E-Q1 converter quickstart tool

Welcome to the quickstart design tool for the LMR36503, LMR36503-Q1, and LMR36503E-Q1. This tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the above converter family to meet application requirements.
Supported products & hardware

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Products
AC/DC & DC/DC converters (integrated FET)
LMR36503E-Q1 — Automotive 3V to 65V, 0.3A buck converter LMR36503 — 3-V to 65-V, 0.3-A ultra-small synchronous buck converter with 6 μA IQ LMR36503-Q1 — Automotive 3-V to 65-V, 0.3-A buck converter optimized for size and light load efficiency
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