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MC34271FB bảng dữ liệu(PDF) 1 Page - ON Semiconductor |
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MC34271FB bảng dữ liệu(HTML) 1 Page - ON Semiconductor |
1 / 12 page © Semiconductor Components Industries, LLC, 2000 April, 2000 – Rev. 0 1 Publication Order Number: MC34271/D MC34271 Liquid Crystal Display and Backlight Integrated Controller The MC34271 is a low power dual switching voltage regulator, specifically designed for handheld and laptop applications, to provide several regulated output voltages using a minimum of external parts. Two uncommitted switching regulators feature a very low standby bias current of 5.0 µA, and an operating current of 7.0 mA capable of supplying output currents in excess of 200 mA. Both devices have three additional features. The first is an ELD Output that can be used to drive a backlight or a liquid crystal display. The ELD output frequency is the clock divided by 256. The second feature allows four additional output bias voltages, in specific proportions to VB, one of the switching regulated output voltages. It allows use of mixed logic circuitry and provides a voltage bias for N–Channel load control MOSFETs t. The third feature is an Enable input that allows a logic level signal to turn–“off” or turn–“on” both switching regulators. Due to the low bias current specifications, this device is ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. MC34271 Features: • Low Standby Bias Current of 5.0 µA • Uncommitted Switching Regulators Allow Both Positive and Negative Supply Voltages • Logic Enable Allows Microprocessor Control of All Outputs • Synchronizable to External Clock • Mode Commandable for ELD and LCD Interface • Frequency Synchronizable • Auxiliary Output Bias Voltages Enable Load Control via N–Channel FETs MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.) Rating Symbol Value Unit Input Voltage VDD 16 Vdc Power Dissipation and Thermal Characteristics Maximum Power Dissipation – Case 873 PD 1.43 W Thermal Resistance, Junction–to–Ambient R θJA 100 °C/W Thermal Resistance, Junction–to–Case R θJC 60 °C/W Output #1 and #2 Switch Current ISL & ISB 500 mA Output #1 and #2 “Off”–State Voltage VSL 60 Vdc Feedback Enable MOSFETs “Off”–State Voltage VLF 20 Vdc Operating Junction Temperature TJ 125 °C Operating Ambient Temperature TA 0 to +70 °C Storage Temperature Range Tstg – 55 to +150 °C Device Package Shipping ORDERING INFORMATION MC34271FB QFP–32 250 Units / Tray QFP–32 FB SUFFIX CASE 873 http://onsemi.com PIN CONNECTIONS AND MARKING DIAGRAM (Top View) 1 32 32 DS1 Ref1 FB1 Comp1 SS1 S1 D1 Drv1 DS2 Ref2 FB2 Comp2 SS2 S2 D2 VB 31 30 29 27 28 26 25 124 23 22 21 20 19 18 17 2 3 4 5 6 7 8 910 11 12 14 13 15 16 A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week |
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