電流 - 輸出/通道 1A±3%
狀態 Prod
Vdd(V) 6-40
腳位數 SOT23-5
文件 Auto./ Ext. Temp Range
驅動類型 DC/DC, Step-down
效率(%) 97
功率晶體管 Built-in
IC代碼 3353 = 3353
產品系列 31 = Commercial/Industrial Analog
產品類別 LT = Lighting LED Driver
腳位/封裝 SD = SOT89
焊料類型 L = Lead-free (RoHS Compliant)
Temperature Grade S4 = Industrial temp. (-40°C to 125°C)
包裝選項 TR = Tape & Reel
外包裝 Tape on Reel

IS31LT3353-SDLS4-TR 特徵

  • Up to 1A output current
  • High efficiency (up to 97% )
  • Wide input voltage range: 6V to 40V
  • Simple low parts count
  • Typical 3% output current accuracy
  • Single pin on/off and brightness control using Internal 40V power switch DC voltage or PWM
  • Up to 1MHz switching frequency
  • Inherent LED open-circuit/short-circuit protection
  • Thermal shutdown protection circuitry
  • Up to 1200: 1 dimming rate
  • LED MR16, MR11 spot light
  • LED street light
  • PAR light
  • Refrigeration lights


The IS31LT3353 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 LED voltage. The chip operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 1A. The IS31LT3353 includes an integrated output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. The output current can be dynamically adjusted by adding either a digital PWM or analog voltage level signal to the ADJ pin. A PWM signal will provide a gated output current while a voltage signal will generate a continuously linear output current. Applying a voltage less than 0.2V 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 and SOT89-5 packages. It operates from 6V to 40V over the temperature range of -40°C to +125°C. APPLICATION CIRCUIT.