STLD40DPUR

STLD40DPUR is a boost converter that operates from 3V to 5.5V. It can provide an output voltage as high as 37V and can drive upto 10 white LEDs in series. This converter is a PFM (pulse frequency modulation) inductor switch that can work in discontinuous (DCM) mode operation. A minimum of time of the embedded boost switch TSW is fixed internally and allows limiting the switching frequency. The output current capability is 20mA with an output voltage of 37V. The regulation is done by sensing the LED current through the resistor RLED. This device can be turned ON/OFF through the logic enable signal pin EN. By applying a low frequency PWM signal the LEDs can be dimmed. The maximum peak inductor current can be programmed by connecting a resistor RSET to the pin RSET. It is used in applications such as white LED supply for LCD backlights, mobile phones, PDAs and organizers, and any handsets powered from 3V to 5.5V.

• Inductor switches boost controller, PFM mode control
• Over voltage protection with automatic restart, adjustable peak current limit
• Enable pin with possibility of PWM dimming control, good load and line regulation
• Regulated output current is 20mA minimum at (VO = 36V (10 white LEDs))
• Quiescent current is 0.4mA typical at (VI = 3V to 4.2V, TJ = 25°C)
• Stand-by current is 1µA typical at (VEN = low, VI = 3.6V, TJ = 25°C)
• Feedback voltage is 165mV typical at (VI = 3.6V, TJ = - 40°C to 85°C)
• Boost switch RDSON is 0.4 ohm typical at (VI = 5.5V, I = 100mA)
• Operating ambient temperature range -40°C to 85°C
• QFN8 package