LTC3108EDE LINER [Linear Technology], LTC3108EDE Datasheet
LTC3108EDE
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LTC3108EDE Summary of contents
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FEATURES Operates from Inputs of 20mV n n Complete Energy Harvesting Power Management System - Selectable V of 2.35V, 3.3V, 4. OUT - LDO: 2.2V at 3mA - Logic Controlled Output - Reserve Energy Output n Power Good ...
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... JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB (NOTE 4) ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC3108EDE#PBF LTC3108EDE#TRPBF LTC3108IDE#PBF LTC3108IDE#TRPBF LTC3108EGN#PBF LTC3108EGN#TRPBF LTC3108IGN#PBF LTC3108IGN#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...
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ELECTRICAL CHARACTERISTICS junction temperature range of –40°C to 85°C, otherwise specifi cations are at T PARAMETER Minimum Start-Up Voltage No-Load Input Current Input Voltage Range Output Voltage V Quiescent Current OUT VAUX Quiescent Current LDO Output Voltage LDO Load Regulation ...
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LTC3108 TYPICAL PERFORMANCE CHARACTERISTICS I and Effi ciency vs V OUT 1:20 Ratio Transformer 3000 2500 EFFICIENCY 2000 1500 1000 I OUT 500 0 200 0 100 V (mV and Effi ciency OUT IN 1:100 ...
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TYPICAL PERFORMANCE CHARACTERISTICS Resonant Switching Waveforms V = 20mV IN 1:100 RATIO TRANSFORMER C1 PIN 2V/DIV C2 PIN 2V/DIV SW PIN 50mV/DIV 3108 G09 10μs/DIV Start-Up Voltage Sequencing V = 50mV IN CH1 1:100 RATIO TRANSFORMER VSTORE C = 220μF ...
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LTC3108 PIN FUNCTIONS (DFN/SSOP) VAUX (Pin 1/Pin 2): Output of the Internal Rectifi er Cir- cuit and V for the IC. Bypass VAUX with at least 1μ capacitance. An active shunt regulator clamps VAUX to 5.25V (typical). VSTORE ...
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BLOCK DIAGRAM (DFN Package Shown) C1 1:100 0.5Ω VAUX 1μF OPERATION (Refer to the Block Diagram) The LTC3108 is designed to use a small external step-up transformer to create an ultralow ...
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LTC3108 OPERATION Oscillator The LTC3108 utilizes a MOSFET switch to form a resonant step-up oscillator using an external step-up transformer and a small coupling capacitor. This allows it to boost input voltages as low as 20mV high enough to provide ...
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OPERATION In a typical application, a storage capacitor (typically a few hundred microfarads) is connected to V VAUX exceeds 2.5V, the V capacitor will be allowed to OUT charge up to its regulated voltage. The current available to charge the ...
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LTC3108 OPERATION 5.0 2.5 0 3.0 2.0 1.0 0 5.0 2.5 0 3.0 2.0 1.0 0 5.0 2 Figure 1. Output Voltage Sequencing (with V 10 VSTORE (V) PGD (V) V (V) OUT VLDO (V) VAUX (V) ...
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APPLICATIONS INFORMATION Introduction The LTC3108 is designed to gather energy from very low input voltage sources and convert it to usable output volt- ages to power microprocessors, wireless transmitters and analog sensors. Such applications typically require much more peak power, ...
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LTC3108 APPLICATIONS INFORMATION The low voltage capability of the LTC3108 design allows it to operate from a TEG with temperature differentials as low as 1°C, making it ideal for harvesting energy in applications in which a temperature difference exists between ...
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APPLICATIONS INFORMATION COMPONENT SELECTION Step-Up Transformer The step-up transformer turns ratio will determine how low the input voltage can be for the converter to start. Using a 1:100 ratio can yield start-up voltages as low as 20mV. Other factors that ...
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LTC3108 APPLICATIONS INFORMATION To minimize losses and capacitor charge time, all capaci- tors used for V and VSTORE should be low leakage. OUT See Table 5 for recommended storage capacitors. Table 5. Recommended Storage Capacitors VENDOR PART NUMBER/SERIES AVX BestCap ...
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APPLICATIONS INFORMATION the capacitor. A method for calculating the maximum rate at which the load pulses can occur for a given output cur- rent from the LTC3108 will also be shown. In this example set to 3.3V, and ...
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LTC3108 APPLICATIONS INFORMATION Design Example 2 In many pulsed load applications, the duration, magnitude and frequency of the load current bursts are known and fi xed. In these cases, the average charge current required from the LTC3108 to support the ...
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TYPICAL APPLICATIONS Li-Ion Battery Charger and LDO Powered by a Solar Cell with Indoor Lighting + + SOLAR CELL – T1: COILCRAFT LPR6235-253PML Supercapacitor Charger and LDO Powered by a Thermopile Generator HONEYWELL CQ200 THERMOPILE + 220μF DC Input Energy ...
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LTC3108 PACKAGE DESCRIPTION 3.60 0.05 2.20 0.05 1.70 0.05 0.25 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED TO BE ...
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PACKAGE DESCRIPTION .254 MIN .0165 ± .0015 RECOMMENDED SOLDER PAD LAYOUT .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS) 3. DRAWING NOT TO SCALE *DIMENSION ...
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LTC3108 TYPICAL APPLICATION Dual TEG Energy Harvester Operates from Temperature Differentials of Either Polarity HOT + TEG TEC COLD LPR6235-752SML COLD + TEC TEG HOT LPR6235-752SML RELATED PARTS PART NUMBER DESCRIPTION LTC1041 Bang-Bang Controller LTC1389 Nanopower Precision Shunt Voltage Reference ...