Product details


Topology Current Source Vin (Min) (V) 5 Vin (Max) (V) 40 Vout (Min) (V) 0 Vout (Max) (V) 40 Iout (Max) (A) 0.56 Iq (Typ) (mA) 0.6 Operating temperature range (C) -40 to 125 Features Enable/Shutdown, Fault Detection, Fault Diagnostic, LED Open Detection, LED Short to Ground Detection, Thermal Foldback, Thermal Shutdown open-in-new Find other Automotive LED drivers

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Automotive LED drivers


  • Qualified for Automotive Applications
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • Functional safety capable
    • Documentation available to aid functional safety system design
  • 8-Channel LED Driver With Analog and PWM Dimming
  • Wide Input-Voltage Range: 5 V–40 V
  • Adjustable Constant Output Current Set by Reference Resistor
    • Maximum Current: 70 mA per Channel
    • Maximum Current: 560 mA in Parallel Operation Mode
    • Accuracy: ±3% per Channel
    • Accuracy: ±4% per Device
  • PWM Dimming Input (PWM)
    • Turn ON/OFF Delay Time: 25 µs (typ.), 45 µs (max.)
  • 4-Bank PWM Dimming to Control 8 Channels
  • Open- and Shorted-LED Detection With Deglitch
  • Fault Pin for Open, Short, and Thermal-Shutdown Failure Reporting, Allowing Parallel Bus Connection of up to 15 Devices
  • Temperature-Current Foldback to Prevent Thermal Shutdown, With Programmable Threshold
  • Single Resistor for Stop-Current Set Point
  • Single Resistor for Tail-Current Set Point
  • Operating Junction Temperature Range –40°C to 150°C
  • Package: 20-Pin Thermally Enhanced PWP Package (PDSO)

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open-in-new Find other Automotive LED drivers


The TPS92638-Q1 is an eight-channel linear LED driver with PWM dimming control. Its design is ideal for driving multiple strings of LEDs up to a medium power range.

This device can drive up to eight strings with one to three LEDs in each string, at a total current up to 70 mA per channel. Outputs can be in parallel to provide higher-current drive up to 560 mA.

In multiple-string applications, the device offers the advantage of having common-cathode connection of the LED stings. So, there is only a single return wire needed instead of one per LED string that a system with low-side current sense would need.

The device has the capability for switching LED current between high current and low current for stop and tail applications. Two reference resistors set the two LED current levels from each output.

The included temperature monitor reduces the LED drive current if the IC junction temperature exceeds a thermal threshold. The temperature threshold is programmable through an external resistor. One can disable the thermal current-monitor feature by connecting the TEMP pin to ground. Output of the junction temperature as an analog voltage is available as a factory program option.

open-in-new Find other Automotive LED drivers
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet TPS92638-Q1 8-Channel Linear LED Driver With PWM Dimming datasheet (Rev. C) Jan. 15, 2020
Application note Typical Design Guidelines for TPS92630/8-Q1 in Automotive Rear Lamp Applications Sep. 01, 2020
White paper Streamlining Functional Safety Certification in Automotive and Industrial Jun. 09, 2020
White paper 簡化汽車及工業領域的功 能安全認證 Jun. 09, 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 Jun. 09, 2020
Technical articles Always make the right turn: how to design fault circuits in automotive lighting systems Jan. 16, 2020
Functional safety information TPS92638-Q1 Functional Safety FIT Rate and Failure Mode Distribution Jan. 06, 2020
White paper 자동차 후미등의 트렌드와 토폴로지 (Rev. A) Oct. 16, 2019
White paper 汽車尾燈系統的趨勢與拓撲 (Rev. A) Oct. 09, 2019
White paper Trends and topologies for automotive rear lighting systems (Rev. A) Sep. 23, 2019
Technical articles How to overcome size, EMI and thermal challenges of automotive LED lighting Apr. 09, 2018
White paper LED Drivers for Automotive Exterior Applications (Rev. B) Mar. 27, 2018
Selection guide 汽车外部照明应用的LED驱动器 Mar. 15, 2018
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
User guide EMC Compatible Automotive LED Rear Lamp Sequential-Turn Animation Design Guide Jun. 02, 2016
Application note How to Calculate TPS92630-Q1 Maximum Output Current for Automotive Exterior Ligh Dec. 22, 2015
User guide TPS92638EVM User's Guide (Rev. A) Nov. 24, 2014

Design & development

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

Hardware development


Texas Instruments TPS92638 evaluation module contains a TPS92638 integrated circuit (IC), supporting passive components and three OSRAM LEDs in series per channel, the EVM includes 8 channels. The purpose of this EVM is to facilitate evaluation of the TPS92638 in a typical LED application.

  • 8 Channel LED Driver with Analog and PWM dimming
  • Wide input voltage range: 5 – 40V
  • Max. Current: 70mA per channel, 560mA in parallel operation mode
  • The LED current can be switched between high current and low current for stop/tail applications.
  • Fault pin for open, short and thermal shutdown failure (...)

This design is an analog solution for automotive rear lamps with sequential turn animations. This design is compatible with the TL81000 RI and the BCI test in a third-party EMC lab. This design also illustrates full automotive diagnostic with low quiescent current during fault mode.

  • Automotive Battery Direct Connection
  • Compliance With TL81000 RI and BCI
  • Sequential Turn Animation Without MCU
  • Full Diagnostic and Protection
  • One-Fail-and-All-Fail (OFAF) Function
  • Low-Quiescent Current During Fault Mode

Design tools & simulation

SLVMAQ1C.ZIP (111 KB) - PSpice Model
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 (...)
  • 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

CISPR 25 Class 5 Rated 7.5W Tail-Light Reference Design for Automotive LED Lighting System
TIDA-01348 — This TI Design details a solution for an automotive tail-light application. The design features the TPS92638-Q1 linear LED driver powered by a synchronous buck converter (LM53601-Q1) that is directly supplied from the automotive-battery voltage. This design helps pass CISPR 25 Class 5 conduct (...)
document-generic Schematic
EMC Compatible Automotive LED Rear Lamp With Sequential Turn Animation Reference Design
TIDA-01007 — This design is an analog solution for automotive rear lamps with sequential turn animations. This design is compatible with the TL81000 RI and the BCI test in a third-party EMC lab. This design also illustrates full automotive diagnostic with low quiescent current during fault mode.
document-generic Schematic
Automotive high-side dimming rear light reference design
TIDA-00846 The TI design is for automotive high side dimming rear light, which uses BCM to supply the rear light. In the TI design the high side driver TPS1H100-Q1 is used to output PWM supply with different duty cycle. Linear LED drivers TPS92630-Q1 and TPS92638-Q1 are used to drive the LEDs in constant (...)
document-generic Schematic
Automotive Door Control Switch Reference Design
TIDA-00356 This automotive door control switch reference design showcases a proof-of-concept solution for an automotive door control switch panel that communicates wirelessly to the door side mirror, window lift and door lock mechanisms. Using TI's automotive qualified Bluetooth® low energy + MCU CC2541-Q1 (...)
document-generic Schematic

CAD/CAE symbols

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HTSSOP (PWP) 20 View options

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