電流 - 輸出/通道 ±3%
狀態 Prod
Vdd(V) 6-40
腳位數 SOT23-5, SOT89-5
驅動類型 DC/DC, Step-down
效率(%) 98
功率晶體管 External
IC代碼 3354 = 3354
產品系列 31 = Commercial/Industrial Analog
產品類別 LT = Lighting LED Driver
腳位/封裝 ST = SOT23
焊料類型 L = Lead-free (RoHS Compliant)
Temperature Grade S2 = Industrial temp. (-40°C to 85°C)
包裝選項 TR = Tape & Reel
外包裝 Tape on Reel

IS31LT3354-STLS2-TR 特徵

  • Simple low parts count
  • Wide input voltage range: 6V to 40V
  • Output Current only limited by external component selection
  • High efficiency (up to 98% )
  • Typical 1200:1 dimming ratio
  • Typical 3% output current accuracy
  • Single pin on/off and brightness control using DC voltage or PWM
  • Up to 1MHz switching frequency
  • Inherent open-circuit LED protection
  • Thermal shutdown protection circuitry
  • Low voltage halogen replacement LEDs
  • Automotive lighting
  • Low voltage industrial lighting
  • LED back-up lighting


The IS31LT3354 is a continuous mode inductive step-down converter, designed for driving a single LED or multiple series connected LEDs efficiently from a voltage source higher than the required LED voltage. The device operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 2A or even higher, which is determined by the external MOSFET and inductor. The IS31LT3354 includes a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted linearly by applying an external control signal to the ADJ pin. The ADJ pin will accept either a DC voltage or a PWM waveform. This will provide either a continuous or a gated output current. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off and switches the chip into a low current standby state. The chip is assembled in SOT23-5 package.