LT1932ES6#TRMPBF

LT1932 is a fixed frequency step-up DC/DC converter designed to operate as a constant-current source. Because it directly regulates output current, this device is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals. With an input voltage range of 1V to 10V, the device works from a variety of input sources. This device accurately regulates LED current even when the input voltage is higher than the LED voltage, greatly simplifying battery powered designs. A single external resistor sets LED current between 5mA and 40mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. It is used in application such as cellular telephones, handheld computers, digital cameras, portable MP3 players, pagers etc.

• Upto 80% efficiency, switch current limit is 550mA typical
• Inherently matched LED current
• Adjustable control of LED current
• Drives five white LEDs from 2V, drives six white LEDs from 2.7V, drives eight white LEDs from 3V
• Switching frequency is 1.2MHz typical at (VIN = 1V)
• Uses tiny ceramic capacitors, uses tiny 1mm-tall inductors
• Regulates current even when VIN <gt/> VOUT, operates with VIN as low as 1V
• Quiescent current is 1.2mA typical at (VRSET = 0.2V)
• Operating temperature is -40°C to 85°C
• Package style is 6-lead plastic SOT-23

Ghi chú

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