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CAT37 Datasheet(PDF) 1 Page - Texas Instruments |
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CAT37 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 13 page  CAT37 © Catalyst Semiconductor, Inc. 1 Doc. No. MD-5005 Rev. T Characteristics subject to change without notice 15mA R1 6.34kΩ C1: Taiyo Yuden JMK212BJ475 C2: Taiyo Yuden EMK212BJ105 D1: Zetez ZHCS400 L1: Panasonic ELJEA6R8 or equivalent L1 6.8µH 2 3 1 5 4 SW VIN SHDN D1 C2 1µF C1 1µF VIN 3V to 5V ON OFF CAT37 FB GND CMOS White LED Driver Boost Converter FEATURES Low quiescent ground current (0.5mA typical) Power efficiency over 80% Compatible pinout with LT1932 Adjustable output current (up to 40mA) High frequency 1.2MHz operation Input voltage operation down to 2.5V Low resistance (0.5Ω) power switch Drives up to 4 White LEDs in series Shutdown current less than 1µA Load fault protection against open-circuits Low value external components Low profile (1mm) TSOT-23 5-lead package APPLICATION Color LCD and keypad backlighting Cellular phones Handheld terminals Digital cameras PDAs/Games Portable MP3 players DESCRIPTION The CAT37 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 CAT37 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 R1 controls the output current level. LED currents of up to 40mA can be supported over a wide range of input supply voltages from 2.5V to 7V, making the device ideal for battery-powered applications. 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) 5-lead TSOT-23 package. TYPICAL APPLICATION CIRCUIT Figure 1. Driver for Four High-Brightness White LEDs For Ordering Information details, see page 11. |
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