LMR70503

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

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Product details

Parameters

Topology Inverting Vin (Min) (V) 2.8 Vin (Max) (V) 5.5 Vout (Max) (V) -0.9 Vout (Min) (V) -5.5 Duty cycle (Max) (%) 90 Features Enable Switch current limit (Typ) (A) 0.32 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 1000 Iq (Typ) (mA) 0.3 Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Package | Pins | Size

DSBGA (YFX) 8 0 mm² .865 x 1.65 open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Features

  • Tiny 8-Bump Thin DSBGA Package: 0.84 mm × 1.615 mm × 0.6 mm
  • 2.8 V to 5.5 V Input Voltage Range
  • Adjustable Output Voltage: -0.9 V to -5.5 V
  • 320 mA Switch Current Limit
  • 500 kHz Minimum Switching Frequency
  • Ground Referred Enable Input
  • Under Voltage Lock Out (UVLO)
  • No External Compensation
  • Internal Soft Start
  • 1 µA Shutdown Supply Current
  • Small Output Voltage Ripple
  • WEBENCH Enabled

Performance Benefits

  • Easy To Use
  • Tiny Overall Solution Size Reduces System Cost

SIMPLE SWITCHER is a trademark of Texas Instruments. WEBENCH is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)

Description

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.

open-in-new Find other Buck-boost, inverting & split-rail converters (integrated switch)
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Technical documentation

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Type Title Date
* Datasheet LMR70503 Buck-Boost Converter For Negative Output Voltage in DSBGA datasheet (Rev. A) Apr. 04, 2013
Application note Buck-Boost Converters Solving Power Challenges in Optical Modules May 13, 2019
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles Being negative can still be positive May 07, 2013
User guide AN-2264 LMR70503 Demo Board (Rev. A) Apr. 25, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application note Input and Output Capacitor Selection Sep. 19, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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

Hardware development

EVALUATION BOARD Download
20
Description
The LMR70503 is an inverting buck-boost converter with adjustable negative output voltage in a tiny 8-bump thin micro SMD package (0.84 mm × 1.615 mm × 0.6 mm). Its unique control method is designed to provide fast transient response, low output noise, high efficiency, and tight regulation in the (...)
Features
  • Tiny 8-Bump Thin Micro SMD Package: 0.84 mm × 1.615 mm × 0.6 mm
  • 2.8 V to 5.5 V Input Voltage Range
  • Adjustable Output Voltage: -0.9 V to -5.5 V
  • 320 mA Switch Current Limit
  • 500 kHz Minimum Switching Frequency
  • Ground Referred Enable Input
  • Under Voltage Lock Out (UVLO)
  • No External Compensation
  • Internal Soft Start (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM473A.ZIP (84 KB) - PSpice Model
SIMULATION MODEL Download
SNVM973.ZIP (3 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
RF Sampling 4-GSPS ADC Reference Design with 8-GHz DC-Coupled Differential Amplifier
TIDA-00431 Wideband radio frequency (RF) receivers allow greatly increased flexibility in radio designs. The wide instantaneous bandwidth allows flexible tuning without changing hardware and the ability to capture multiple channels at widely separated frequencies.

This reference design describes a wideband RF (...)

document-generic Schematic
REFERENCE DESIGNS Download
50-Ohm 2-GHz Oscilloscope Front-end Reference Design
TIDA-00826 This reference design is part of an analog front-end for 50Ω-input oscilloscope application. System designers can readily use this evaluation platform to process input signals from DC to 2 GHz in both frequency-domain and time-domain applications.
document-generic Schematic

CAD/CAE symbols

Package Pins Download
DSBGA (YFX) 8 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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