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LMR36503-Q1
  • LMR36503-Q1
  • LMR36503-Q1

LMR36503-Q1

ACTIVE

Automotive 3-V to 65-V, 0.3-A buck converter optimized for size and light load efficiency

Texas Instruments LMR36503-Q1 Product Info

1 April 2026 0

Parameters

Rating

Automotive

Topology

Buck

Iout (max) (A)

0.3

Vin (max) (V)

65

Vin (min) (V)

3

Vout (max) (V)

28

Vout (min) (V)

1

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

Operating temperature range (°C)

-40 to 150

Iq (typ) (A)

0.000004

Duty cycle (max) (%)

99

TI functional safety category

Functional Safety-Capable

Package

VQFN-HR (RPE)-9-4 mm² 2 x 2

Features

  • AEC-Q100-qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • >70% efficiency at 5 mA
    • 4 µA IQ (switching) at 24 VIN to 3.3 VOUT (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 FSW: 200 kHz to 2.2 MHz with RT pin variant
    • Pin compatible with LMR36506-Q1 (65 V, 600 mA)
  • AEC-Q100-qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • >70% efficiency at 5 mA
    • 4 µA IQ (switching) at 24 VIN to 3.3 VOUT (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 FSW: 200 kHz to 2.2 MHz with RT pin variant
    • Pin compatible with LMR36506-Q1 (65 V, 600 mA)

Description

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.

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.

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