R1800K Series 144 nA I Low Quiescent Current Buck DC/DC Converter for Energy Harvester Q No. EA-414-200508 OVERVIEW R1800K is a power-storing buck DC/DC converter for a photovoltaic and vibration energy harvester. 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 operating quiescent current (IQ 144 nA) and a high efficiency (approximately 90% 10 A). A Control function that enables a maximum power optimizes a power supply from an energy harvester. KEY SPECIFICATIONS TYPICAL CHARACTERISTICS Input Voltage Range: 2.0 V to 5.5 V Efficiency vs. Output Current VSET = 3.3 V Output Voltage Range: 2.0 V to 4.5 V Output Voltage Accuracy: 3.0% 100 Operating Quiescent Current: Typ.144 nA (Ta = 25C, at no load) 80 Starting Power: 720 nW 60 Reverse Current Protection (VIN 2.0 V) Accuracy of Maximum Power Voltage: 200 mV 40 Vin= 4 V A PPLICATIONS 20 Vin= 4.5 V Vin= 5 V 0 Energy harvesting module of a photovoltaic 0.1 1 10 100 1000 10000 and vibration energy harvester Output Current (uA) PACKAGE TYPICAL APPLICATION DFN(PLP)2730-12 2.7 mm x 3.0 mm x 0.6 mm Photovoltaic VIN LX Element C IN L Load VFB R1800K COUT SELECTION GUIDE AGND TEST1 TEST2 Product Name Package Quantity per Reel PGND VM R1800KxxxA-TR DFN(PLP)2730-12 5,000 pcs xxx: Select the ideal combination of the set output L = 22 H, CIN = 10 F, COUT = 47 F voltage (V ) and the set maximum power SET voltage (V ) from the code number MPSET starting from 002. 1 Efficiency (%)R1800K No. EA-414-200508 SELECTION GUIDE The set output voltage and set maximum power voltage are user-selectable options. Selection Guide Product Name Package Quantity per Reel Pb Free Halogen Free R1800KxxxA-TR DFN(PLP)2730-12 5,000 pcs Yes Yes xxx: Select the ideal combination of the set output voltage (V ) and SET the set maximum power voltage (V ) from the code number starting from 002. MPSET Output voltage: 2.0 V to 4.5 V in 0.1 V step Maximum power voltage: 2.0 V to 5.3 V in 0.1 V step BLOCK DIAGRAM VIN Vin Vin Vref Iref Vin VM AGND AGND Vin Vin TES T1 Vin Vin Vfb TES T2 AGND AGND Reverse Buffer Logic Current On time generator Protection LX Vfb Vin AGND AGND + Vfb P - PGND VFB AGND AGND P AGND PGND AGND PGND R1800K Block Diagram 2