Tiny LED Driver Reference Design
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Key Document


This reference design contains a unique LED Driver to be supplied out of a single or a dual cell lithium ion battery. The circuit in SEPIC topology accepts input voltages as low as 1.8V to 8.4V. The TPS43000 was chosen for handling  low input voltages. Current regulation is provided with a shunt resistor and operational amplifier (TLV6001U) circuit.

  • Works with an input voltage range of 1.8V to 8.4V
  • Reasonable efficiency
  • For LED with 0.8A current and about 3.3V output voltage
  • Total board size is 47mm x 47mm
  • The design is built and tested

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)1.8
Vin (Max) (V)8.4
Vout (Nom) (V)3.3
Iout (Max) (A).8
Output Power (W)2.64
Input TypeDC
TopologySepic- Synchronous

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD16340Q3  25V, N ch NexFET MOSFET™, single SON3x3, 5.5mOhm  MOSFETs  Sample & Buy Not Available
CSD25404Q3  -20V, P ch NexFET MOSFET™, single SON 3x3, 6.5mOhm  MOSFETs  Sample & Buy Not Available
TLV6001  1-Channel, 1-MHz, low power op amp for cost-sensitive systems  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS43000  Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD16340Q3 VSON-CLIP (DQG)| 8 Download Download
CSD25404Q3 VSON-CLIP (DQG)| 8 Download Download
TLV6001 Download
TPS43000 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 622 21 Aug 2017
Design files (6)
Title Type Size (KB) Date
ZIP 32 21 Aug 2017
ZIP 572 21 Aug 2017
PDF 519 21 Aug 2017
PDF 86 21 Aug 2017
PDF 79 21 Aug 2017
PDF 99 21 Aug 2017

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