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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3522 датащи(PDF) 1 Page - Linear Technology |
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LTC3522 датащи(HTML) 1 Page - Linear Technology |
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1 / 20 page  LTC3522 1 3522f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Synchronous 400mA Buck-Boost and 200mA Buck Converters The LTC ®3522 combines a 400mA buck-boost DC/DC con- verter with a 200mA synchronous buck DC/DC converter in a tiny 3mm ×3mmpackage.The1MHzswitchingfrequency minimizes the solution footprint while maintaining high efficiency. Both converters feature internal soft-start and compensation, simplifying the design process. The buck converter is current mode controlled and utilizes an internal synchronous rectifier for high efficiency. The buck converter supports 100% duty cycle operation to extend battery life. If the PWM pin is held low, the buck converter automatically transitions from Burst Mode opera- tion to PWM mode. With the PWM pin held high, the buck converter remains in low noise, 1MHz PWM mode. The buck-boost converter provides continuous conduc- tion operation to maximize efficiency and minimize noise. At light loads, the buck-boost converter can be placed in Burst Mode operation to improve efficiency and reduce no-load standby current. The LTC3522 provides a 1μA shutdown mode, overtem- perature shutdown and current limit protection on both converters. The LTC3522 is available in a 16-pin low profile 3mm × 3mm QFN package. ■ Dual High Efficiency DC/DC Converters: Buck-Boost (VOUT: 2.2V to 5.25V, IOUT: 400mA for VIN > 3V, VOUT = 3.3V) Buck (VOUT: 0.6V to VIN, IOUT: 200mA) ■ 2.4V to 5.5V Input Voltage Range ■ Pin Selectable Burst Mode ® Operation ■ 25μA Total Quiescent Current for Both Converters in Burst Mode Operation ■ Independent Power Good Indicator Outputs ■ Integrated Soft-Start ■ Thermal and Overcurrent Protection ■ <1μA Quiescent Current in Shutdown ■ Small 0.75mm × 3mm × 3mm QFN Package ■ Flash-Based MP3 Players ■ Medical Instruments ■ Digital Cameras ■ PDAs, Handheld PCs ■ Personal Navigation Devices , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6404251 and 6166527. + PVIN1 PVIN2 SW2 FB2 VOUT1 LTC3522 SHDN2 1M 137k 68.1k L1: COILCRAFT MSS6132-8.2 μH L2: COILCRAFT MSS6132-4.7 μH 4.7 μF 6.8 μF 4.7 μF 12pF Li-Ion L2 4.7 μH L1 8.2 μH VOUT1 3.3V 300mA (400mA VIN > 3V) VOUT2 1.8V 200mA VIN 2.4V TO 4.2V 432k 3522 TA01a SHDN1 PWM SW1A SW1B FB1 PGOOD2 PGOOD1 PGND1 GND PGND2 ON OFF PWM BURST VIN (V) 2.4 92 94 96 98 5.4 3522 TA01b 88 90 86 84 82 80 76 78 74 72 70 3.4 4.4 100 BUCK-BOOST IOUT = 100mA VOUT = 3.3V BUCK IOUT = 100mA VOUT = 1.8V Efficiency vs VIN |
Аналогичный номер детали - LTC3522 |
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Аналогичное описание - LTC3522 |
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ссылки URL |
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