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Controladores para LED de retroiluminación

LM3508

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Controlador LED blanco de corriente constante magnética síncrona

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LM3508

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Detalles del producto

Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 10 Vout (max) (V) 17.5 Type Inductive Switching frequency (max) (kHz) 850 Duty cycle (max) (%) 91 LED current per channel (mA) 30 Peak efficiency (%) 85 Topology Boost Features OVP Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 10 Vout (max) (V) 17.5 Type Inductive Switching frequency (max) (kHz) 850 Duty cycle (max) (%) 91 LED current per channel (mA) 30 Peak efficiency (%) 85 Topology Boost Features OVP Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YZR) 9 3.0625 mm² 1.75 x 1.75
  • Drives 4 Series White LEDs with up to 30mA
  • >80% Peak Efficiency
  • Up to 100kHz PWM Brightness Control
  • Accurate ±5% LED Current Regulation across VIN range
  • Internal Synchronous PFET (No Schottky Diode Required)
  • True Shutdown Isolation
  • Output Short-Circuit Protection
  • 17.5V Over-Voltage Protection
  • Internal Soft-Start Eliminates Inrush Current
  • Wide Input Voltage Range: 2.7V to 5.5V
  • 850kHz Fixed Frequency Operation
  • Low Profile 9-Bump DSBGA Package (1.514mm x 1.514mm x 0.6mm)

All trademarks are the property of their respective owners.

  • Drives 4 Series White LEDs with up to 30mA
  • >80% Peak Efficiency
  • Up to 100kHz PWM Brightness Control
  • Accurate ±5% LED Current Regulation across VIN range
  • Internal Synchronous PFET (No Schottky Diode Required)
  • True Shutdown Isolation
  • Output Short-Circuit Protection
  • 17.5V Over-Voltage Protection
  • Internal Soft-Start Eliminates Inrush Current
  • Wide Input Voltage Range: 2.7V to 5.5V
  • 850kHz Fixed Frequency Operation
  • Low Profile 9-Bump DSBGA Package (1.514mm x 1.514mm x 0.6mm)

All trademarks are the property of their respective owners.

The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal of up to 100kHz to the DIM pin. Internal soft-start circuitry is designed to eliminate high in-rush current at start-up. For maximum safety, the device features an advanced short-circuit protection when the output is shorted to ground. Additionally, over-voltage protection and an 850kHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. During shutdown, the output is disconnected from the input preventing a leakage current path through the LEDs to ground. The LM3508 is available in a tiny 9-bump chip-scale DSBGA package.

The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal of up to 100kHz to the DIM pin. Internal soft-start circuitry is designed to eliminate high in-rush current at start-up. For maximum safety, the device features an advanced short-circuit protection when the output is shorted to ground. Additionally, over-voltage protection and an 850kHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings. During shutdown, the output is disconnected from the input preventing a leakage current path through the LEDs to ground. The LM3508 is available in a tiny 9-bump chip-scale DSBGA package.
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Documentación técnica

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* Data sheet LM3508 Synchronous Magnetic Constant Current White LED Driver datasheet (Rev. C) 03 may 2013
White paper Common LED Functions and LED Driver Design Considerations 21 sep 2020
Application note Analog PWM Dimming in White-LED Drivers 21 dic 2016
EVM User's guide AN-1593 LM3508 Evaluation Board 04 jun 2007

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LM3508TLEV — Placa de evaluación LM3508TL

The LM3508 is a synchronous boost converter (no external Schottky diode required) that provides a constant current output. It is designed to drive up to 4 series white LEDs at 30mA from a single-cell Li-Ion battery. A single low power external resistor is used to set the maximum LED current. The (...)

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