Efficient, high-current, linear LED driver reference design for SpO2 and other medical applications TIDA-010043 (ACTIVE)

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Key Document

Description

This reference design provides a protected, efficient (headroom-controlled), high-current (up to 1.5 A), linear (accurate and fast) light-emitting diode (LED) driver reference design to enable peripheral capillary oxygen saturation (SpO2) and other medical applications. A typical SpO2 application drives current through LEDs. Most of these drivers are integrated with analog front-end devices and work at the typical value of 100 mA. A higher current drive is necessitated to cover wide range of human and veterinary physiology. This design enables self-calibration and uses a look-up table for headroom control to optimally drive LEDs resulting in minimum power dissipation across the control element. The design operated from an input voltage range of 1.8 V to 4.2V and enables LED currents up to 1.5 A.

Features
  • Higher efficiency by providing headroom control to optimally drive LED:
    •  - Built-in self-calibration and look-up table for headroom control
    • Dynamic adjustment of the LED supply voltage, to achieve optimal efficiency at the programmed current levels
  • Diagnostics (LED open, LED short, LED disconnect) and protection mechanism for fault by disconnecting the supply using e-fuse
  • Wide operating input range from 1.8 V to 5.5 V to support all battery type inputs
  • Programmable range selection for LED current (from 100 mA to 1.5 A)
  • Compatible with AFE44xx series EVMs (tested with AFE4403 EVM) for driving LEDs
  • Tested with MSP430G2553 LaunchPad™ and two on-board LEDs (green and red)

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Schematic/Block Diagram

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Design Files

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD13202Q2  12V, N ch NexFET MOSFET™, single SON2x2, 9.3mOhm  MOSFETs  Sample & Buy Not Available
CSD13306W  12V, N ch NexFET MOSFET™, single WLP 1.0x1.5, 10.2mOhm  MOSFETs  Sample & Buy Not Available
OPA333  1.8V, 17µA, microPower, precision, zero-drift CMOS op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA365  2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV7021  Small-Size Micropower Low-Voltage Comparator  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TMUX1119  5-V low-leakage-current, 2:1 1-channel precision multiplexer  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules
TPS2595  2.7V to 18V, 4A, 34mΩ eFuse with fast overvoltage protection  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS63802  High current, high efficiency single inductor buck-boost converter  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD13202Q2 WSON (DQK)| 6 Download
CSD13306W Download -
OPA333 Download Download
Download Download
Download Download
OPA365 Download Download
Download Download
TLV7021 Download
Download Download
Download Download
TMUX1119 Download
TPS2595 Download Download
TPS63802 VSON-HR (DLA)| 10 Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 6474 08 Mar 2019
Design files (6)
Title Type Size (KB) Date
ZIP 443 08 Mar 2019
ZIP 1622 08 Mar 2019
PDF 946 08 Mar 2019
PDF 192 08 Mar 2019
PDF 29 08 Mar 2019
PDF 347 08 Mar 2019
Related Tools & Software

Reference Designs  ( 1 )

Design Kits & Evaluation Modules  ( 2 )

Name Part Number Tool Type
Value Line MSP430 LaunchPad™ Development Kit  MSP-EXP430G2ET  Development Kits 
AFE4403 Integrated AFE for Heart-Rate Monitors and Pulse Oximeters Evaluation Module  AFE4403EVM  Evaluation Modules & Boards 

Software (1)


Models (1)

Title Category Type Size (KB) Date Views
TIDA-010043 Simulation TINA-TI Reference Design ZIP 25 KB 08 Mar 2019

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