IS32LT3956

驅動 Buck
狀態 Sample
Vin(V) 4.5~38
調光 Ext/Int PWM
文件
關鍵特點 3-Ampere true avg. current, PWM dimmable buck regulator, high-side, bypass NMOS switch for ON/OFF ctrl of LED string segment, spread spectrum and 2uA shutdown
功率晶體管 Built-in
腳位尺寸(mm) eTSSOP-16
產品系列 32 = Automotive Analog and Mixed Signal
IC代碼 3956 = 3956
產品類別 LT = Lighting LED Driver
包裝選項 blank = Tray or Tube

IS32LT3956 特徵

  • Wide input voltage supply from 4.5V to 40V
  • 3A maximum true average output current control
  • Cycle-by-cycle current limit
  • Integrated MOSFET switch
  • Dimming via direct logic input or power supply voltage Internal control loop compensation
  • Under-voltage lockout (UVLO) and thermal shutdown protection
  • 2μA low power shutdown
  • Spread spectrum to optimize EMI
  • Robust fault protection and report function: LED string open/short circuit
  • - - Pin-to-GND short - Component open/short faults - Adjacent pin-to-pin short - Parallel FAULTB pins connection
  • AEC-Q100 qualification in progress
  • Motorcycle high/low bean
  • Daytime running lights
  • Turn/stop lights
  • Front and rear fog lights

概觀

The IS32LT3956 is a DC-to-DC switching converter, which integrates an N-channel MOSFET to operate in a buck configuration. The device supplies a wide input voltage between 4.5V and 40V and provides a constant current of up to 3A for driving a single LED or multiple series connected LEDs. The external resistor, RSET, is used to adjust LED output current, which allowing the output voltage to be automatically adjusted for a variety of LED configurations. True average output current operation is achieved with fast transient response by using cycle-by-cycle, controlled on-time method. The IS32LT3956 operates in a fixed frequency mode during switching. There is an external resistor connected between the VCC and TON pins used to configure the on-time (switching frequency). A logic input PWM signal to the enable (EN) pin is applied to adjust the LED current. The brightness of LED is proportional to the duty cycle of the PWM signal. The embedded high-side NMOS can be used to bypass some LEDs in the LED string to achieve different amount LEDs output. Such as high/low beam application. IS32LT3956 is available in an eTSSOP-16 package with an exposed pad for enhanced thermal dissipation.

 

相關IC编號

IC 編號 庫存數量 可用數量
IS32LT3956-TR