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Synchronous Magnetic Constant Current White LED Driver


Package | PIN: YZR | 9
Temp: S (-30 to 85)
Carrier: Cut Tape
Qty Price
1-9 $0.91
10-24 $0.81
25-99 $0.75
100-249 $0.64
250-499 $0.59
500-749 $0.48
750-999 $0.39
1000+ $0.35


  • 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)

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Texas Instruments  LM3508TL/NOPB

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.