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CD43-4R7 Scheda tecnica(PDF) 1 Page - Linear Technology |
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CD43-4R7 Scheda tecnica(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LT1945 1945f FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Dual Micropower DC/DC Converter with Positive and Negative Outputs The LT ®1945 is a dual micropower DC/DC converter in a 10-pin MSOP package. Each converter is designed with a 350mA current limit and an input voltage range of 1.2V to 15V, making the LT1945 ideal for a wide variety of appli- cations. Both converters feature a quiescent current of only 20 µA at no load, which further reduces to 0.5µA in shutdown. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to ±34V to be easily generated without the use of costly transformers. The LT1945’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. s Generates Well-Regulated Positive and Negative Outputs s Low Quiescent Current: 20 µA in Active Mode (per Converter) <1 µA in Shutdown Mode s Operates with VIN as Low as 1.2V s Low VCESAT Switch: 250mV at 300mA s Uses Small Surface Mount Components s High Output Voltage: Up to ±34V s Tiny 10-Pin MSOP Package s Small TFT LCD Panels s Handheld Computers s Battery Backup s Digital Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. LOAD CURRENT (mA) 0.1 1 10 100 1945 TA01a 90 85 80 75 70 65 60 55 50 +12V OUTPUT –20V OUTPUT Dual Output (+12V, –20V) Converter Efficiency at VIN = 3.6V VIN SW1 FB2 LT1945 4 3 L1 10 µH D1 D2 SHDN2 24.9k 365k C2 1 µF –20V 10mA VIN 2.7V TO 5V 1945 TA01 GND 7 PGND 9 PGND 6 810 SW2 4.7pF C1 4.7 µF C4 0.1 µF NFB1 2 5 1 SHDN1 L2 10 µH D3 1M 115k C3 1 µF 100pF C1: TAIYO YUDEN JMK212BJ475 C2, C3: TAIYO YUDEN TMK316BJ105 C4: TAIYO YUDEN EMK107BJ104 D1, D2, D3: ZETEX ZHCS400 L1, L2: MURATA LQH3C100 12V 20mA |
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