LX1993CDU-T

LX1993CDU-T Datasheet

LX1993 HIGH EFFICIENCY LED DRIVER

Part	Datasheet
LX1993CDU-T	LX1993CDU-T (pdf)

Related Parts	Information
LX1993CDU	LX1993CDU

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LX1993 HIGH EFFICIENCY LED DRIVER New Product Information and Sales Kit Manufactured by Microsemi Power Management Group Garden Grove Telephone 714 898-8121 More than solutions enabling possibilities W.Microsemi .C O M LX1993 High Efficiency LED Driver INTRODUCTION CONFIDENTIAL INFORMATION This new product introduction guide is intended for use only by Microsemi’s sales people and authorized representatives and distributors. This material can be adapted for customer presentations, but the sales strategy and summary [pricing, availability, etc.] is confidential and should not be shown to customers. The LX1993 is a compact high efficiency step-up boost controller for driving white or color LEDs in backlight or front light systems and offers designers maximum flexibility with respect to efficiency and cost. The LX1993 implements a pseudo-hysteretic pulse frequency modulation topology and features an internal N-Channel MOSFET. Further, the LX1993 features control circuitry that is optimized for portable systems e.g., quiescent supply current of 80µA typ and a shutdown current of less than 1µA . These design enhancements provide for improved performance in battery operated systems applications. The device input voltage range is from 1.6V to allowing for a wide selection of system battery voltages and start-up operation is guaranteed at 1.6V input. Programming the output current is readily achieved by using one external current sense resistor in series with the LEDs. In this configuration, LED current provides a feedback signal to the FB pin, maintaining constant current regardless of varying LED forward voltage VF . Moreover, the LX1993 is capable of achieving output currents in excess of 20mA. The LX1993 has an additional feature for simple dynamic adjustment of the output current i.e., up to 100% of the maximum programmed current . Designers can make this adjustment via an analog reference signal or a direct PWM generated signal applied to the ADJ pin and any PWM amplitude is easily accommodated with a single external resistor. The LX1993 is available in both the 8-Pin MSOP, thus requiring minimal PCB area.. The LX1993 is a compact high efficiency step-up boost controller for driving white or color LEDs for improved performance in battery operated systems applications. SALES KIT New Product Information and Sales Kit W.Microsemi .C O M LX1993 High Efficiency LED Driver KEY PRODUCT INFORMATION BLOCK DIAGRAM FB ADJ Reference Logic 50pF Control Logic Driver Shutdown Logic OUT GND 4µA SHDN KEY FEATURES ! >80% Maximum Efficiency ! 70µA Typical Quiescent Supply Current ! Externally Programmable Peak Inductor Current Limit For Maximum Efficiency ! Logic Controlled Shutdown ! < 1µA Shutdown Current ! Dynamic Output Current Adjustment Via Analog Reference Or Direct PWM Input ! Internal Power MOSFET ! 8-Pin MSOP Package SALES KIT New Product Information and Sales Kit W.Microsemi .C O M LX1993 High Efficiency LED Driver

PDF Datasheet Preview

LX1993 HIGH EFFICIENCY LED DRIVER

New Product Information and Sales Kit

Manufactured by Microsemi

Power Management Group Garden Grove

Telephone 714 898-8121

More than solutions enabling possibilities

W.Microsemi .C O M

LX1993

High Efficiency LED Driver

INTRODUCTION

CONFIDENTIAL INFORMATION This new product introduction guide is intended for use only by Microsemi’s sales people and authorized representatives and distributors. This material can be adapted for customer presentations, but the sales strategy and summary [pricing, availability, etc.] is confidential and should not be shown to customers.

The LX1993 is a compact high efficiency step-up boost controller for driving white or color LEDs in backlight or front light systems and offers designers maximum flexibility with respect to efficiency and cost. The LX1993 implements a pseudo-hysteretic pulse frequency modulation topology and features an internal N-Channel MOSFET. Further, the LX1993 features control circuitry that is optimized for portable systems e.g., quiescent supply current of 80µA typ and a shutdown current of less than 1µA . These design enhancements provide for improved performance in battery operated systems applications. The device input voltage range is from 1.6V to allowing for a wide selection of system battery voltages and start-up operation is guaranteed at 1.6V input.

Programming the output current is readily achieved by using one external current sense resistor in series with the LEDs. In this configuration, LED current provides a feedback signal to the FB pin, maintaining constant current regardless of varying LED forward voltage VF . Moreover, the LX1993 is capable of achieving output currents in excess of 20mA.

The LX1993 has an additional feature for simple dynamic adjustment of the output current i.e., up to 100% of the maximum programmed current . Designers can make this adjustment via an analog reference signal or a direct PWM generated signal applied to the ADJ pin and any PWM amplitude is easily accommodated with a single external resistor.

The LX1993 is available in both the 8-Pin MSOP, thus requiring minimal PCB area..

The LX1993 is a compact high efficiency step-up boost controller for driving white or color LEDs for improved performance in battery operated systems applications.

SALES KIT

New Product Information and Sales Kit

W.Microsemi .C O M

LX1993

High Efficiency LED Driver

KEY PRODUCT INFORMATION

BLOCK DIAGRAM

FB ADJ

Reference Logic
50pF

Control Logic

Driver

Shutdown

Logic

OUT GND 4µA

SHDN

KEY FEATURES
! >80% Maximum Efficiency ! 70µA Typical Quiescent Supply Current ! Externally Programmable Peak Inductor Current Limit For Maximum

Efficiency ! Logic Controlled Shutdown ! < 1µA Shutdown Current ! Dynamic Output Current Adjustment Via Analog Reference Or Direct PWM

Input ! Internal Power MOSFET ! 8-Pin MSOP Package

SALES KIT

New Product Information and Sales Kit

W.Microsemi .C O M

LX1993

High Efficiency LED Driver

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LX1993CDU-T Datasheet file may be downloaded here without warranties.

Datasheet ID: LX1993CDU-T 649019