DDDAAATTTAAASSSHHHEEEEEETTT AAAEEEMMM222000999444000 Highly ecient, regulated dual-outputs, ambient energy manager for TEG with optional primary battery Features Description Ultra-low-power start-up: The AEM20940 is an integrated energy management subsys- - Cold start from 60mV input voltage and 150W input tem that extracts DC power from a TEG to simultaneously power with the optional external module (typical) store energy in a rechargeable element and supply the system - Cold start from 380mV and 100W input power without with two independent regulated voltages. The AEM20940 al- the optional external module (typical) lows to extend battery lifetime and ultimately eliminates the primary energy storage element in a large range of wireless Ultra-low-power boost regulator: applications like industrial monitoring, home automation and - Open-circuit voltage sensing for MPPT every 21 s smart agriculture. - Congurable MPPT with 2-pin programming The AEM20940 harvests the available input current up to - Selectable Voc ratios of 50, 55 or 75% 110 mA. It integrates an ultra-low-power boost converter to - Input voltage operation range from 50 mV to 3.5 V charge a storage element, such as a Li-ion battery, a thin lm - MPPT voltage operation range from 50 mV to 3.5 V battery, a supercapacitor or a conventional capacitor. The - Constant impedance matching (ZMPPT) boost converter operates with input voltages in a range from Integrated 1.2/1.8 V LDO regulator: 50 mV to 3.5 V . With its unique cold start circuit, it can start - Up to 20 mA load current operating with empty storage elements at an input voltage as - Power gated dynamically by external control low as 380mVand an input power of just 100W.Thanks to - Selectable output voltage an external optional module, the input voltage for coldstart Integrated 1.8/2.5/3.3 V LDO regulator: lowers to 60mV with an input power of just 150W. - Up to 80 mA load current with 300 mV drop-out The low-voltage supply typically drives a microcontroller at - Power gated dynamically by external control 1.2V or1.8 V.The high-voltagesupplytypicallydrives a radio - Selectable output voltage transceiver at 1.8 V, 2.5 V or 3.3 V. Both are driven by highly- ecient LDO (Low Drop-Out) regulators for low noise and Flexible energy storage management: high stability. - Selectableoverchargeandoverdischargeprotectionforany Conguration pins determine various operating modes by set- type of rechargeable battery or (super)capacitor tingpredenedconditionsfortheenergystorageelement(over- - Fast supercapacitor charging charge oroverdischargevoltages), and by selectingthe voltage - Warning when the battery is running low of the high-voltage supply and the low-voltage supply. - Warning when output voltage regulators are available The chip integrates all the active elements for powering a typ- Optional primary battery: ical wireless sensor. Five capacitors and two inductors are re- - Automatic switching to the primary battery when the sec- quired, available in the small 0402 and 0603 size, respectively. ondary battery is exhausted With only seven external components, integration is maxi- Integrated balun for dual-cell supercapacitor mum, footprint and BOM are minimum, optimizing the time- to-market and the costs of WSN designs. Applications Device information TEG harvesting Smart agriculture Part number Package Body size Industrial monitoring Wireless sensor nodes 20AEM20940C0000 QFN 28-pin 5mm x 5mm Home automation Cold-start circuit Primary (optional) battery BUCK (optional) Thermoelectric SRC generator PRIM R8 (optional) ZMPP FB PRIM U BUFSRC R7 (optional) LBOOST FB PRIM D RZMPP SWBOOST (optional) CSRC Li-ion BATT battery BOOST AEM20940 BAL CBOOST 2 QFN28 5x5 mm STATUS 2 : 0 Micro- SWBUCK LVOUT controller LBUCK BUCK CLV ENHV Radio HVOUT ENLV CBUCK transceiver CHV DDDSSS AAAEEEMMM222000999444000 RRREEEVVV111...222 CCCooopppyyyrrriiiggghhhttt ccc 222000111888 eee---pppeeeaaasss SSSAAA 111 CFG 2 : 0 CSIN SELMPP 1 : 0 CSOUT STONBATT GNDDDDAAATTTAAASSSHHHEEEEEETTT AAAEEEMMM222000999444000 Contents List of Figures 1 Introduction 3 1 Simplied schematic view 3 2 Pinout diagram QFN28 . 4 2 Absolute Maximum Ratings 5 3 Functional block diagram 7 4 Simplied schematic view of the AEM20940 8 3 Thermal Resistance 5 5 Diagram of the AEM20940 modes 8 6 Typical application circuit 1 . 13 4 Typical Electrical Characteristics at 25 C 5 7 Typical application circuit 2 . 14 8 Cold start with a capacitor connected to BATT . 15 5 Recommended Operation Conditions 6 9 Cold start with a battery connected to BATT 15 10 Overvoltage mode 16 6 Functional Block Diagram 7 11 Shutdown mode (without primary battery) . 16 7 Theory of Operation 8 12 Switch to primary battery if the battery is overdis- charged 17 7.1 Deep sleep & Wake up modes . 8 13 Boost eciency for Isrc at 100 A, 1 mA, 10 mA 7.2 Normal mode 9 7.3 Overvoltage mode . 9 and 100 mA with Lboost = 10mH . 18 7.4 Primary mode . 10 14 Boost eciency for Isrc at 100 A, 1 mA, 10 mA 7.5 Shutdown mode 10 and 100 mA with Lboost = 22mH . 19 7.6 Maximum power point tracking 10 15 Quiescent current with LDOs on and o 19 7.7 Balun for dual-cell supercapacitor 10 16 HVOUT at 3.3 V and 2.5 V . 20 17 LVOUT at 1.2 V and 1.8 V . 20 8 System Conguration 11 18 HVOUT eciency at 1.8 V, 2.5 V and 3.3 V 21 8.1 Battery and LDOs conguration 11 19 Eciency of BUCK cascaded with LVOUT at 1.2 V 8.2 MPPT conguration 11 and 1.8 V 21 8.3 Primary battery conguration . 11 20 Schematic example 22 8.4 ZMPPT conguration . 11 21 Layout example for the AEM20940 and its passive 8.5 Start-on-battery conguration . 11 components 23 8.6 No battery conguration 11 22 QFN28 5mm x 5mm . 24 8.7 Storage element information 11 23 Board layout . 24 9 Typical Application Circuits 13 List of Tables 9.1 Example: Circuit 1 . 13 9.2 Example: Circuit 2 . 14 1 Pins description 4 2 Absolute maximum ratings 5 10 Performance Data 18 3 Thermal data . 5 10.1BOOST conversion eciency 10 uH . 18 4 Electrical characteristics . 6 10.2BOOST conversion eciency with 22 uH . 19 5 Recommended operating conditions . 6 10.3Quiescent current . 19 6 LDOs congurations . 9 10.4High-voltage LDO regulation . 20 7 Usage of CFG 2:0 11 10.5Low-voltage LDO regulation 20 8 Usage of SELMPP 1:0 11 10.6High-voltage LDO eciency 21 9 BOMexampleforAEM20940anditsrequiredpassive 10.7Low-voltage LDO eciency 21 components 22 11 Schematic 22 12 Layout 23 13 Package Information 24 13.1Plasticquadatpackno-lead(QFN285mmx5mm) . 24 13.2Board layout 24 DDDSSS AAAEEEMMM222000999444000 RRREEEVVV111...222 CCCooopppyyyrrriiiggghhhttt ccc 222000111888 eee---pppeeeaaasss SSSAAA 222