LX1995-1CSE

Product Summary

The Microsemi LX1995-1CSE is a miniature LED driver with integrated drivers. It is designed to drive white or color LEDs in portable display applications. The LX1995-1CSE is an adjustable step-up boost converter. The device can switch up to 2MHz allowing designers to use a low cost, small inductor and filter capacitor. The driver LX1995-1CSE supports a wide input voltage range (1.6V to 5.5V) with efficiency greater than 85% and can start up at 1.6V input. The LX1995-1CSE is a low cost, high efficiency LED driver. The design is based on a pseudo-hysteretic pulse frequency modulation topology. In portable battery applications the driver offers high system efficiency with low quiescent current: in operation IQ is <70μA and in standby IQ is < 1μA. The LX1995-1CSE output current is programmable using an external current sense resistor in series with LEDs. This configuration provides a feedback to the FB pin which maintains constant output current independent of input voltage and LED forward voltage (VF). LED dimming is accomplished using a PWM signal or varying DC voltage methods. The LX1995-1CSE is available in the 5-Pin TSOT and SOT-23 package.

Parametrics

LX1995-1CSE absolute maximum ratings: (1)Supply Input Voltage: -0.3V to 7.0V; (2)Feedback Peak Pulse Input Voltage (VFB): -0.3V to VIN + 0.3V; (3)Shutdown Input Voltage (VSHDN): -0.3V to VIN + 0.3V; (4)Switch Voltage (VSW): -0.3V to 30V; (5)Switch Current (ISW): 500mA; (6)Operating Temperature Range: -40℃ to 85℃; (7)Maximum Operating Junction Temperature: 125℃; (8)Storage Temperature Range: -65℃ to 150℃; (9)Peak Package Solder Reflow Temp. (40 second max. exposure): 260℃ (+0, -5).

Features

LX1995-1CSE features: (1)< 1μA Shutdown Current; (2)> 85% Maximum Efficiency; (3)Efficient at Low Current Levels; (4)< 70μA Quiescent Supply Current in Operating Mode; (5)VIN Range 1.6V to 5.5V; (6)Logic Controlled Shutdown; (7)Dimming Options: PWM or Varying DC Voltage; (8)Tiny 5-Pin TSOT Package; (9)Smallest External Components.

Diagrams