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LTC3523EUD-2-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3523EUD-2-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC3523/LTC3523-2 1 3523fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters The LTC ®3523/LTC3523-2 combine a 600mA step-up DC/DC converter with a 400mA synchronous step-down DC/DC converter in a tiny 3mm × 3mm package. The 1.2MHz/2.4MHz switching frequencies minimize the solution footprint while maintaining high efficiency. Both converters feature soft-start and internal compensation, simplifying the design. Both the step-up and step-down converters are current mode controlled and utilize an internal synchronous rec- tifier for high efficiency. The step-up supports 0% duty cycle operation and the step-down converter supports 100% duty cycle operation to extend battery run time. If the MODE pin is held high, both converters automati- cally transition between Burst Mode operation and PWM operation improving light load efficiency. Fixed, low noise 1.2MHz/2.4MHz PWM operation is selected when MODE is grounded. The LTC3523/LTC3523-2 provide a sub-3μA shutdown mode, overtemperature shutdown and current limit pro- tection on both converters. The LTC3523/LTC3523-2 are housed in a 16-lead 3mm × 3mm × 0.75mm QFN package. LTC3523 Efficiency and Power Loss vs Load Current n Dual High Efficiency DC/DC Converters: Step-Up (VOUT = 1.8V to 5.25V, ISW = 600mA) Step-Down (VOUT = 0.615V to 5.5V, IOUT = 400mA) n 1.8V to 5.5V Input Voltage Range n Up to 94% Efficiency n Pin Selectable Burst Mode ® Operation n 45μA Quiescent Current in Burst Mode Operation n 1.2MHz (LTC3523) or 2.4MHz (LTC3523-2) Switching Frequency n Independent Power Good Indicator Outputs n Integrated Soft-Start n Thermal and Overcurrent Protection n <3μA Quiescent Current in Shutdown n Small 16-Lead 3mm × 3mm × 0.75mm QFN Package n Digital Cameras n Medical Instruments n Industrial Handhelds n GPS Navigators + VIN1 SW1 SW2 FB2 MODE PGOOD2 SHDN2 FB1 PGOOD1 SHDN1 VOUT 10pF VIN 10μF VOUT2 STEP-DOWN OUTPUT 1.2V 200mA 511k 511k 3523 TA01a 634k 365k 4.7μH 4.7μH VIN2 LTC3523 VBAT GND1 GND2 GND3 47μF 2-CELL ALKALINE VIN 1.8V TO 3.2V VOUT1 STEP-UP OUTPUT 3.3V 200mA 10μF OFF ON OFF ON LOAD CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.1 10 100 1000 3523 TA01b 0 1000 10 100 1 0.1 1 STEP-UP STEP-DOWN VIN = 2.4V VOUT1 = 3.3V VOUT2 = 1.2V fOSC = 1.2MHz EFFICIENCY P0WER LOSS L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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