LMR36503

Name: LMR36503
Brand: TI
SKU: LMR36503
Price: 1.378 USD

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3-V to 65-V, 0.3-A ultra-small synchronous buck converter with 6 μA IQ

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Data sheet

document-pdfAcrobat LMR36503 3-V to 65-V, 0.3-A Ultra-Small Synchronous Buck Converter with Ultra-Low IQ datasheet (Rev. B) PDF | HTML

LMR36503

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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

Topology

Buck

Type

Converter

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

2200

Features

Enable, Fixed Output, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, Wettable flanks package

Control mode

current mode

Vout (min) (V)

1

Vout (max) (V)

60

Rating

Catalog

Operating temperature range (°C)

-40 to 150

Iout (max) (A)

0.3

Vin (min) (V)

3

Vin (max) (V)

65

Topology

Buck

Type

Converter

Switching frequency (min) (kHz)

200

Switching frequency (max) (kHz)

2200

Features

Enable, Fixed Output, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, Wettable flanks package

Control mode

current mode

Vout (min) (V)

1

Vout (max) (V)

60

Rating

Catalog

Operating temperature range (°C)

-40 to 150

VQFN-HR (RPE)

9

4 mm² 2 x 2

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 compatible with LMR36506 (65 V, 600 mA)
- Adjustable switching frequency: 200 kHz to 2.2 MHz with RT pin variant
Minimized solution size and cost:
- Highest power density with internal compensation and reduced external component count
- Ultra-small, 2-mm × 2-mm HotRod™ package with wettable flanks available
High efficiency across load range with low power dissipation:
- > 90% peak efficiency at 1 MHz (5 V_OUT adjustable)
Ultra-low operating quiescent current at no load
- 4 µA at 24 V_IN to 3.3 V_OUT (fixed output option)

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 compatible with LMR36506 (65 V, 600 mA)
- Adjustable switching frequency: 200 kHz to 2.2 MHz with RT pin variant
Minimized solution size and cost:
- Highest power density with internal compensation and reduced external component count
- Ultra-small, 2-mm × 2-mm HotRod™ package with wettable flanks available
High efficiency across load range with low power dissipation:
- > 90% peak efficiency at 1 MHz (5 V_OUT adjustable)
Ultra-low operating quiescent current at no load
- 4 µA at 24 V_IN to 3.3 V_OUT (fixed output option)

The LMR36503 is the industry smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2-mm × 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 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 compensation 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 kHz to 2.2 MHz. The precision EN/UVLO feature allows precise control of the device during the start-up and shutdown. The power-good flag, with built-in glitch filter and delayed release, offers a true indication of the system status, eliminating the requirement for an external supervisor. The compact solution size and rich feature set of LMR36503 simplifies implementation for a wide range of industrial applications.

The LMR36503 is the industry smallest 65 V, 0.3 A synchronous step-down DC/DC converter in 2-mm × 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 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 compensation 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 kHz to 2.2 MHz. The precision EN/UVLO feature allows precise control of the device during the start-up and shutdown. The power-good flag, with built-in glitch filter and delayed release, offers a true indication of the system status, eliminating the requirement for an external supervisor. The compact solution size and rich feature set of LMR36503 simplifies implementation for a wide range of industrial applications.

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	Type	Title		Date
*	Data sheet	LMR36503 3-V to 65-V, 0.3-A Ultra-Small Synchronous Buck Converter with Ultra-Low IQ datasheet (Rev. B)	PDF \| HTML	08 Nov 2022
	Certificate	LMR36503MSCEEVM EU Declaration of Conformity (DoC)		17 Apr 2024
	Application note	Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A)	PDF \| HTML	26 Jul 2021
	Technical article	Choosing buck converters and LDOs for miniature industrial automation equipment	PDF \| HTML	29 Jan 2020
	EVM User's guide	LMR36503RFEVM User's Guide		03 Apr 2019
	Application brief	Powering Drones With a Wide VIN DC-DC Converter (Rev. A)		05 Feb 2019
	Analog Design Journal	Accurately measuring efficiency of ultralow-IQ devices		22 Jan 2014

Design & development

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