R1801K Series Buck DC/DC Converter for Energy Harvester with Adjustable Maximum Power Point Control, Adjustable Output Voltage and PG Function No. EA-422-201210 OVERVIEW R1801K is a power-storing buck DC/DC converter for a photovoltaic and vibration energy harvester. The Power Good (PG) function can output PG signal according to the output voltage facilitating to build a system. A low operating quiescent current allows a harvester to be used under a low-illumination environment, and it is suitable for an equipment with low power supplied from a harvester. KEY BENEFITS Providing a low power supply (IQ 200 nA) and a high efficiency (approximately 80% 10 A). Monitoring the output voltage to output Power Good (PG) signal. Adjustable the output voltage and maximum power point control voltage in 100 mV step by the setting pins. KEY SPECIFICATIONS TYPICAL CHARACTERISTICS Input Voltage Range: 2.3 V to 5.5 V Efficiency vs. Output Current VOUT = 3.0 V Output Voltage Range: 2.3 V to 4.5 V 100 Maximum Power Point Control Voltage Range :2.7 V to 5.3 V 80 Output Voltage Accuracy: 3.0% 60 Operating Quiescent Current: Vin= 4 V Typ. 200 nA (Ta =25C, at no load) 40 under condition of V = 4 V, V = 3.0 V IN OUT Vin= 4.5 V 20 Starting Power: 1 W (V = 4 V, V = 3.0 V) IN OUT 0 Reverse Current Protection (VIN 2.0 V) 0.1 1 10 100 1000 Adjustable Maximum Power Point Control, Iout A Adjustable Output Voltage Power Good Function TYPICAL APPLICATION APPLICATION Energy harvesting module of a photovoltaic and vibration energy harvester PACKAGE DFN(PLP)2730-12 3.0 mm x 2.7 mm x 0.6 mm SELECTION GUIDE Product Name Package Quantity per Reel R1801KxxxA-TR DFN(PLP)2730-12 5,000 pcs xxx: Select the ideal combination of the set output voltage (VSET) and the set maximum power point L = 22 H, C = 10 F, C = 47 F IN OUT control voltage (VMPSET) from the code number starting from 001. 1 Efficiency % R1801K No. EA-422-201210 SELECTION GUIDE The set output voltage and the set maximum power point control voltage are user-selectable options. Selection Guide Product Name Package Quantity per Reel Pb Free Halogen Free R1801KxxxA-TR DFN(PLP)2730-12 5,000 pcs Yes Yes xxx: Select the ideal combination of the set output voltage (VSET) and the set maximum power point control voltage (VMPSET) from the code number starting from 001. Refer to CODE LIST for lineup. When use the PG function, put the VSET voltage 2.5 V or higher. It is recommended to set as VMPSET VSET + 0.5 V. BLOCK DIAGRAM VIN VIN VIN VIN VIN VMP 1 VREF Rev er se VMP Vin D I V Onti me 2 Curr ent Gener ator P rote ct ion VMP LX 3 VIN VFB VREF CMP AGND VFB D IV VFB VFB PGND VFB VIN VFB VSET 1 VREF Vref VSET 2 VSET 3 VFB VFB VFB VFB D IV + PG VREF AGND AGND PGND AGND PGND R1801K Block Diagram 2