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LTC3521 データシート(PDF) 1 Page - Linear Technology |
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LTC3521 データシート(HTML) 1 Page - Linear Technology |
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1 / 20 page  LTC3521 3521f Typical applicaTion FeaTures applicaTions DescripTion Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters TheLTC®3521combinesa1Abuck-boostDC/DCconverter anddual600mAsynchronousbuckDC/DCconverters.The 1.1MHz switching frequency minimizes the solution foot- printwhilemaintaininghighefficiency.Allthreeconverters feature soft-start and internal compensation to minimize the solution footprint and simplify the design process. The buck converters are current mode controlled and utilize an internal synchronous rectifier to improve ef- ficiency. The buck converters support 100% duty cycle operation to extend battery life. If the PWM pin is held low, the buck converters automatically transition from Burst Mode operation to PWM mode at high loads. With the PWM pin held high, the buck converters remain in low noise, 1.1MHz PWM mode. Thebuck-boostconverterfeaturescontinuousconduction operation to maximize efficiency and minimize noise. At light loads, the buck-boost converter can be operated in Burst Mode operation to improve efficiency and reduce no-load standby current. The LTC3521 provides a <2μA shutdown mode, over- temperature shutdown and current limit protection on all converters. The LTC3521 is available in a 24-pin 0.75mm × 4mm × 4mm QFN package, and a 20-pin thermally enhanced TSSOP package. n Three High Efficiency DC/DC Converters: Buck-Boost (VOUT: 1.8V to 5.25V, IOUT: 1A) Dual Buck (VOUT: 0.6V to VIN, IOUT: 600mA) n 1.8V to 5.5V Input Voltage Range n Pin-Selectable Burst Mode® Operation n 30µA Total Quiescent Current in Burst Mode Operation n Independent Power Good Indicator Outputs n Integrated Soft-Start n Thermal and Overcurrent Protection n <2µA Current in Shutdown n Small 4mm × 4mm QFN and Thermally Enhanced TSSOP Packages n Bar Code Readers n Medical Instruments n Handy Terminals n PDAs, Handheld PCs n GPS Receivers + PVIN1 PVIN2 SW2 SW3 FB2 FB3 VOUT1 LTC3521 SHDN2 SHDN1 1.0M 137k 68.1k 22µF 10µF 4.7µF Li-Ion 4.7µH 4.7µH VOUT1 3.3V 800mA (1A, VIN > 3.0V) VOUT2 1.8V 600mA 100k 100k 10µF 4.7µH VOUT3 1.2V 600mA VIN 2.4V TO 4.2V 221k 3521 TA01a SHDN3 PWM SW1A SW1B FB1 PGOOD2 PGOOD1 PGOOD3 PGND2 GND PGND1 ON OFF PWM BURST VIN (V) 2.4 92 94 96 98 5.4 3521 TA01b 88 90 86 84 82 80 76 78 74 72 70 3.4 4.4 100 VOUT1 = 3.3V IOUT = 500mA VOUT2 = 1.8V IOUT = 200mA VOUT3 = 1.2V IOUT = 200mA Efficiency vs VIN L , LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U. S. Patents, including 6404251, 6166527. |
同様の部品番号 - LTC3521 |
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同様の説明 - LTC3521 |
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