LMR36503-Q1

Name: LMR36503-Q1
Brand: TI
SKU: LMR36503-Q1
Price: 1.626 USD

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

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Data sheet

document-pdfAcrobat LMR36503-Q1 3-V to 65-V, 0.3-A Synchronous Buck Converter Optimized for Size and Light Load Efficiency datasheet (Rev. B) PDF | HTML

LMR36503-Q1

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Data sheet

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Product details

Iout (max) (A)

0.3

Vin (min) (V)

3

Vin (max) (V)

65

Type

Converter

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

Control mode

current mode

Vout (min) (V)

1

Vout (max) (V)

28

Rating

Automotive

Operating temperature range (°C)

-40 to 150

Iout (max) (A)

0.3

Vin (min) (V)

3

Vin (max) (V)

65

Type

Converter

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

Control mode

current mode

Vout (min) (V)

1

Vout (max) (V)

28

Rating

Automotive

Operating temperature range (°C)

-40 to 150

VQFN-HR (RPE)

9

4 mm² 2 x 2

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)

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)

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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Technical documentation

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	Type	Title		Date
*	Data sheet	LMR36503-Q1 3-V to 65-V, 0.3-A Synchronous Buck Converter Optimized for Size and Light Load Efficiency datasheet (Rev. B)	PDF \| HTML	22 Sep 2020
	Selection guide	Buck Converter Quick Reference Guide (Rev. B)		08 Apr 2021
	Functional safety information	LMR3650x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA	PDF \| HTML	26 Oct 2020
	EVM User's guide	LMR36506MSCEVM User’s Guide (Rev. A)		19 May 2020
	Technical article	Optimizing flip-chip IC thermal performance in automotive designs	PDF \| HTML	11 Dec 2019

Design & development

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

Evaluation board

LMR36506EVM — Automotive 3-V to 65-V, 0.6-A ultra-small synchronous buck converter evaluation module

The LMR36506MSCEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR36506-Q1 synchronous step-down converter. The LMR36503-Q1 can also be evaluated with LMR36506MSCEVM.

User guide: PDF