TIDA-010043

Efficient, high-current, linear LED driver reference design for SpO2 and other medical applications

Design files

TIDA-010043

Design files

Overview

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)

Industrial

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

Design guide — TIDA-010043

TIDUEK8.PDF (6574 K)

Reference design overview and verified performance test data

Schematic — TIDA-010043

TIDRZ89.PDF (347 K)

Detailed schematic diagram for design layout and components

Bill of materials (BOM) — TIDA-010043

TIDRZ90.PDF (29 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

Assembly drawing — TIDA-010043

TIDRZ91.PDF (192 K)

Detailed overview of design layout for component placement

CAD/CAE symbol — TIDA-010043

TIDRZ93.ZIP (1622 K)

Files used for 3D models or 2D drawings of IC components

Gerber file — TIDA-010043

TIDCFC6.ZIP (443 K)

Design file that contains information on physical board layer of design PCB

PCB layout — TIDA-010043

TIDRZ92.PDF (946 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

TPS63802 — 2-A, high-efficient, 11-µA quiescent current buck-boost converter in QFN/DFN package

Data sheet: PDF | HTML

Analog switches & muxes

TMUX1119 — 3-pA on-state leakage current, 5-V, 2:1 (SPDT), 1-channel precision multiplexer

Data sheet: PDF | HTML

Comparators

TLV7021 — Low power, small size comparator with open-drain output

Data sheet: PDF | HTML

High-speed op amps (GBW ≥ 50 MHz)

OPA365 — 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier

Data sheet: PDF | HTML

MOSFETs

CSD13202Q2 — 12-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 9.3 mOhm

Data sheet: PDF | HTML

MOSFETs

CSD13306W — 12-V, N channel NexFET™ power MOSFET, single WLP 1 mm x 1.5 mm, 10.2 mOhm

Data sheet: PDF | HTML

Precision op amps (Vos<1mV)

OPA333 — Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML

eFuses & hot swap controllers

TPS2595 — 2.7-V to 18-V, 34mΩ, 0.5-4A eFuse with over voltage protection in small WSON package

Data sheet: PDF | HTML

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Software

Firmware

TIDCFC7 — TIDA-010043 Firmware

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TIDCFC7 — TIDA-010043 Firmware

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Latest version

Version: 01.00.00.00

Release date: 07 Mar 2019

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TIDA-010043 Firmware (zip) — 123 K

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Design tools & simulation

Simulation model

TIDA-010043 Simulation — TIDM058.ZIP (25 K)

Technical documentation

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	Type	Title		Date
*	Design guide	Efficient, high current, linear LED driver reference design for SpO2		Mar. 08, 2019

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