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LT1948 Datasheet(PDF) 1 Page - Linear Technology |
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LT1948 Datasheet(HTML) 1 Page - Linear Technology |
1 / 4 page LT1948 1 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights. I TFT-LCD Notebook Display Panels I TFT-LCD Desktop Monitor Display Panels I Digital Cameras I Handheld Computers , LTC and LT are registered trademarks of Linear Technology Corporation. I Complete Solution Under 1.2mm I Develops Three Outputs from a 3.3V or 5V Supply I Externally Programmable VON Delay I Fixed Frequency Low Noise Outputs I All Ceramic Capacitors I Operates at 3MHz Switching Frequency I Fast Transient Response I Few External Components Required I 2.6V to 6V Input Range I Tiny 8-Lead MSOP Package APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO DC/DC Converter for TFT-LCD Panels August 2000 Final Electrical Specifications L2, 2.2 µH BAT54S D3A D3B D1 MBRM120 C5 1 µF C4 0.22 µF C2 2.2 µF C1 2.2 µF VIN 2.5V TO 6V AVDD 8V 260mA VON 23V 10mA 1948 F01 VOFF –8V 15mA FB1 SW1 LT1948 VIN VON CT SW2 VO2 C6 22nF C1, C2: TAIYO YUDEN LMK212BJ225 C3: TAIYO YUDEN TMK316BJ224 C4: TAIYO YUDEN EMK212BJ224 C5: TAIYO YUDEN LMK212BJ105 L1–L3: TAIYO YUDEN LB2012-2R2 GND L1, 2.2 µH D2 CMDSH-3 L3 2.2 µH C3 0.22 µF R1 53.6k R2 10k Figure 1. 3.3V Powered TFT-LCD Bias Generator 2ms/DIV 1948 TA01a VIN 5V/DIV VON 20V/DIV AVDD 10V/DIV VOFF 10V/DIV Start-Up Waveforms The LT®1948 is a highly integrated multiple output DC/DC converter designed for use in TFT-LCD panels. The device contains two independent switching regulators: the main regulator has an adjustable output voltage with an internal 1.1A switch that can generate a boosted voltage as high as 30V while the second regulator generates 23V at up to 10mA for positive bias. A simple level-shift charge pump off the main switch node generates the negative bias voltage. An external capacitor sets the delay time from AVDD reaching final value to 23V appearing at the VON pin. The 3MHz switching frequency allows the use of tiny low profile chip inductors and capacitors throughout, provid- ingalownoise,lowcosttotalsolutionwithallcomponents under 1.25mm in height. The device operates from an input range of 2.6V to 6V and is available in an 8-lead MSOP package. FOR INFORMATION PURPOSES ONLY OBSOLETE: Contact Linear Technology for Potential Replacement |
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