Specification	LMR70503TM/NOPB

Current - Output	270 mA
Frequency - Switching	500 kHz
Function	Step-Up/Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 ¯C
Operating Temperature [Min]	-40 °C
Output Configuration	Negative
Output Type	Adjustable
Package / Case	8-WFBGA, DSBGA
Supplier Device Package	8-DSBGA
Synchronous Rectifier	False
Topology	Buck-Boost
Voltage - Input (Max) [Max]	5.5 V
Voltage - Input (Min) [Min]	2.8 V
Voltage - Output (Max) [Max]	-5.5 V
Voltage - Output (Min/Fixed)	-1 V

LMR70503 Series

2.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator

Part	Current - Output	Frequency - Switching	Voltage - Input [Min]	Voltage - Input [Max]	Supplied Contents	Board Type	Voltage - Output [Max]	Voltage - Output [Min]	Regulator Topology	Outputs and Type	Outputs and Type	Main Purpose	Utilized IC / Part	Voltage - Input (Max) [Max]	Output Type	Voltage - Output (Min/Fixed)	Supplier Device Package	Function	Package / Case	Output Configuration	Mounting Type	Topology	Number of Outputs	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Output (Max) [Max]	Voltage - Input (Min) [Min]
Texas Instruments LMR70503EVM/NOPB	320 mA	500 kHz	2.8 V	5.5 V	Board(s)	Fully Populated	-5.5 V	-9 V	Buck-Boost	Non-Isolated	1	DC/DC Negative Inverter	LMR70503
Texas Instruments LMR70503TMX/NOPB	270 mA	500 kHz												5.5 V	Adjustable	-1 V	8-DSBGA	Step-Up/Step-Down	8-WFBGA DSBGA	Negative	Surface Mount	Buck-Boost	1	-40 °C	125 ¯C	-5.5 V	2.8 V
Texas Instruments LMR70503TM/NOPB	270 mA	500 kHz												5.5 V	Adjustable	-1 V	8-DSBGA	Step-Up/Step-Down	8-WFBGA DSBGA	Negative	Surface Mount	Buck-Boost	1	-40 °C	125 ¯C	-5.5 V	2.8 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 4.16
		10	$ 2.75
		25	$ 2.38
		100	$ 1.97
	Digi-Reel®	1	$ 4.16
		10	$ 2.75
		25	$ 2.38
		100	$ 1.97
	Tape & Reel (TR)	250	$ 1.77
		500	$ 1.64
		750	$ 1.58
		1250	$ 1.51
		1750	$ 1.47
		2500	$ 1.43
		6250	$ 1.35
Texas Instruments	SMALL T&R	1	$ 2.42
		100	$ 2.00
		250	$ 1.43
		1000	$ 1.08

Description

General part information

LMR70503 Series

The LMR70503 is a buck-boost converter with adjustable negative output voltage in a tiny 8-bump thin DSBGA package. Its unique control method is designed to provide fast transient response, low output noise, high efficiency, and tight regulation in the smallest possible PCB area. The LMR70503 has built in soft start, peak current limit, minimum switching frequency, and Under Voltage Lock Out (UVLO), with no external compensation required. For ease of use, the Enable pin is referred to the IC ground, instead of the lowest potential of the IC: the negative output voltage.

Documents

Technical documentation and resources

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

Application note

AN-643 EMI/RFI Board Design (Rev. B)

Application note

AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)

Application note

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

Application note

AN-2264 LMR70503 Demo Board (Rev. A)

EVM User's guide

LMR70503 Buck-Boost Converter For Negative Output Voltage in DSBGA datasheet (Rev. A)

Data sheet

Input and Output Capacitor Selection

Application note

Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)

Application note

AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)

Application note

Power Management Guide 2018 (Rev. R)

Selection guide

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

Application note

LMR70503TM/NOPB

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LMR70503TM/NOPB

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Technical Specifications

LMR70503 Series

Pricing

Description

LMR70503 Series

Documents

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

AN-643 EMI/RFI Board Design (Rev. B)

AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

AN-2264 LMR70503 Demo Board (Rev. A)

LMR70503 Buck-Boost Converter For Negative Output Voltage in DSBGA datasheet (Rev. A)

Input and Output Capacitor Selection

Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)

AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)

Power Management Guide 2018 (Rev. R)

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)

Semiconductor and IC Package Thermal Metrics (Rev. D)

Buck-Boost Converters Solving Power Challenges in Optical Modules

LMR70503 Series