High Efficiency Constant Current Led Driver

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  • L99LD01 is a precise constant current DC–DC converter LED driver for automotive applications, dedicated to the control of high-brightness LED headlights an housed in a LQFP32™ package.

    The device is designed to be used in Boost, Buck-Boost and Fly back converter topologies. An internal random dither oscillator works in low frequency modulation, allowing the RF spectrum of the switching frequency to spread so to reduce EMC emissions. The slope compensation ensures good converter loop stability whatever is the duty cycle needed by the application.
    The converter is able to work either in full power mode or in low frequency dimming mode.
    The device includes an internal low drop voltage regulator, that can be used to supply a microcontroller, and a reset pin, that is useful for resetting the microcontroller at the start up and every time that the regulated output voltage falls down below an established voltage threshold.

    Key Features

    • Automotive qualified
    • Constant current operation
    • Current LED settable by external sensing resistor and adjustable via SPI
    • Converter switching frequency adjustable by external resistor (RSF)
    • EMC reduction by internal spread spectrum dither oscillator
    • Low frequency PWM dimming operation.
    • Maximum input current limiter
    • Maximum switching duty cycle limiter
    • Slope compensation adjustable by external resistor (R9)
    • Battery overvoltage shut down protection (ext. R3, R4 resistors required)
    • Led chain OV detection (ext. R5, R6)
    • Multiplexed output for monitoring and control of LED temperature (external NTC resistor required), voltage of LED chain, and low frequency PWM
    • SPI communication serial interface transceiver (SDI, SDO, SCK, CSN)
    • Regulated output for micro supply 5 V ± 2 %-20 mA
    • Parameter programming and settings of internal memory registers by the dedicated SPI interface:
      • LED current reference adjusting (± 66.7 %)
      • Maximum input current limiter reference adjusting (± 55.5 %)
      • Random dither frequency sweeping, modulation frequency and deviation percentage
    • Power on reset pin output
    • ESD protection

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Part Number
Marketing Status
Quantity
Budgetary Price (US$)*
Package
Packing Type
Temperature (°C) ECCN (US)
More info
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min
max
L99LD01TR-E
Active
1000 1.6804 LQFP 32 7x7x1.4 Tape And Reel - - EAR99
MORE INFO

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office Buy now
L99LD01
Active
1000 1.6804 LQFP 32 7x7x1.4 Tray - - EAR99
MORE INFO

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office

L99LD01TR-E

Marketing Status

Active

Quantity

1000

Unit Price (US$)

1.6804*

Unit Price (US$)

1.6804

Package

LQFP 32 7x7x1.4

Packing Type

Tape And Reel

Operating Temperature (°C)

(min)

-

(max)

-

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L99LD01

Marketing Status

Active

Quantity

1000

Unit Price (US$)

1.6804*

Unit Price (US$)

1.6804

Package

LQFP 32 7x7x1.4

Packing Type

Tray

Operating Temperature (°C)

(min)

-

(max)

-

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DB1223
      High efficiency constant current LED driver
      2.0
      35.85 KB
      PDF
      DS9959
      High efficiency constant current LED driver for automotive applications
      3.0
      996.46 KB
      PDF
      DB1223

      High efficiency constant current LED driver

      DS9959

      High efficiency constant current LED driver for automotive applications

    • Description Version Size Action
      AN4501
      Design of a boost LED driver using L99LD01
      1.1
      940.79 KB
      PDF
      AN4501

      Design of a boost LED driver using L99LD01

    • Description Version Size Action
      TN0897
      ST SPI protocol
      2.2
      420.96 KB
      PDF
      TN0897

      ST SPI protocol

Publications and Collaterals

    • Description Version Size Action
      L99LD01 Automotive LED driver flyer 1.0
      844.36 KB
      PDF

      L99LD01 Automotive LED driver flyer

    • Description Version Size Action
      Smart power solutions for car body applications 4.0
      3.38 MB
      PDF

      Smart power solutions for car body applications

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L99LD01
Active
LQFP 32 7x7x1.4 Automotive Ecopack2
L99LD01TR-E
Active
LQFP 32 7x7x1.4 Automotive Ecopack2

L99LD01

Package:

LQFP 32 7x7x1.4

Material Declaration**:

PDF

Marketing Status

Active

Package

LQFP 32 7x7x1.4

Grade

Automotive

RoHS Compliance Grade

Ecopack2

L99LD01TR-E

Package:

LQFP 32 7x7x1.4

Material Declaration**:

PDF

Marketing Status

Active

Package

LQFP 32 7x7x1.4

Grade

Automotive

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.