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CAT32RD4-TE7 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT32RD4-TE7 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
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1 / 14 page  1 CAT32 CMOS White LED Driver FEATURES s Low quiescent ground current (0.5mA typical) s Power efficiency over 80% s Compatible pinout with LT1932 s Adjustable output current (up to 40mA) s High frequency 1.2MHz operation s Input voltage operation down to 2.0V s Low resistance (0.5 Ω Ω Ω Ω Ω) high voltage power switch s Drives up to 4 White LEDs in series s Shutdown current less than 1 µA s Load fault protection against open-circuits s Low value external components s Low profile (1mm) 6-lead SOT23 and TDFN (0.8mm) package DESCRIPTION The CAT32 is a DC/DC step up converter that delivers a regulated output current. Operation at a constant switching frequency of 1.2MHz allows the device to be used with very small value external inductor and ceramic capacitors. The CAT32 is targeted to drive multiple white light- emitting diodes (LEDs) connected in series and provides the necessary regulated current to control the brightness and the color purity. An external resistor R SET controls the output current level. LED currents of up to 40mA can be supported over a wide range of input supply voltages from 2V to 7V, making the device ideal for battery-powered applications. © 2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc No. 5001, Rev. AC APPLICATIONS s Color LCD and keypad backlighting s Cellular phones s Handheld terminals A high voltage output stage allows up to 4 White LEDs to be driven in series. Series drive provides inherent current matching. LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with “near zero” quiescent current. In addition to overcurrent limiting protection, the device also includes detection circuitry to ensure protection against open-circuit load fault conditions. The device is available in a low profile (1mm max height) 6-lead thin SOT23 package and in a TDFN (0.8mm max height) package. TYPICAL APPLICATION C1: Taiyo Yuden JMK212BJ475 C2: Taiyo Yuden EMK212BJ105 D1: Zetez ZHCS400 L1: Sumida CLQ4D106R8 (Panasonic ELJEA6R8) s Digital cameras s PDAs/Games s Portable MP3 players 15mA 4 2 3 1 6 5 SW VIN SHDN RSET D1 VIN 2.7V to 4.2V PWM DIMMING CONTROL CAT32 LED GND SOT23 Pin Numbers Figure 1. Li-Ion Driver for Four High-Brightness White LEDs ALO GEN FR TM LEAD FREE |
Similar Part No. - CAT32RD4-TE7 |
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Similar Description - CAT32RD4-TE7 |
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