VISHAY BCCOMPONENTS www.vishay.com Aluminum Capacitors Technical Note Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board By Gerald Tatschl MAL219699003E3 196 HVC ENYCAPTM - MINI CHARGER AND BACKUP BOARD DESCRIPTION The MAL219699003E3 mini charger and backup demonstration circuit is a fully transparent charger unit that uses a BQ24095 charging IC and TPS610997 boost converter IC from Texas Instruments to boost the capacitor voltage up to a 5 V constant output voltage. This mini charger is equipped with a 90 F / 4.2 V 196 HVC ENYCAPTM hybrid energy storage capacitor, which is charged through the power input. This power input is compatible with a USB port. The charged energy is buffered in the 196 HVC capacitor and can be used for backup power. An independent fixed output voltage of 5 V is created from the backup power of the hybrid capacitor by the TPS610997 synchronous boost converter IC, which provides a constant output voltage with very high efficiency. STORAGE Vsupply Charger BQ24095 Vcharge Vcapacitor Boost converter TPS610997 Vbackup Fig. 1 - Typical block diagram for a backup application and fixed output supply. The storage element is charged through a USB socket Vsupply. The constant output voltage Vbackup is provided independently from Vsupply by the boost converter. Alternatively, the path Vcapacitor can be used ENERGY STORAGE CAPACITOR A 90 F / 4.2 V 196 HVC ENYCAP hybrid energy storage capacitor is used as an energy buffer in the MAL219690111E3 mini charger, and will provide a fixed output voltage supply with its backup function. The backup time provided by the capacitor depends mainly on the backup current and is indicated in Fig. 2. In the proposed configuration, minutes to hours are achievable. Revision: 22-May-2018 Document Number: 28451 1 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 TECHNICAL NOTE ENYCAPTM Energy storage capacitor Technical Note www.vishay.com Vishay BCcomponents Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board Axis Title 106 10000 104 1000 1st line 2nd line 2nd line Backup Time (s) 105 103 102 100 10 C = 90 F (1.4 V to 8.4 V) 1 1 10 100 1000 10 10 000 Discharge Current (mA) Fig. 2 - Typical backup time as a function of discharge current CHARGING IC Texas Instruments' BQ24095 is a low cost linear type (LDO) charger with a CC / CV (constant current / constant voltage) mode charging profile of up to 1.25 A. The charging current is adjustable to USB requirements. The charging voltage of the CV mode will be fixed at 4.35 V. The detailing pin assignment is shown in Table 1. The BQ24095 is a highly integrated linear charger device, targeted at space-limited portable applications. The IC operates from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low cost unregulated adapters. The BQ24095 has a single power output that charges a backup system. A load can be placed in parallel with the backup capacitor as long as the average system load does not keep the capacitor from charging fully during the 10-hour safety time. TABLE 1 - PIN ASSIGNMENT BQ24095 PIN # PIN NAME 1 IN FUNCTION Source input Directly connected with a micro USB connector 2 ISET Maximum current setting (CC mode) R5 is assembled with 2 k to GND for a 300 mA limit 3 VSS 4 PRETERM 5 PG Connected to GND Maximum current setting (CV mode) 1 k to GND for a 50 mA limit on CV mode charging LED indicator for input voltage TECHNICAL NOTE ON: input voltage is normal (4.45 V ~ 6.45 V) OFF: UVLO or input voltage is abnormal 6 NC 7 ISET2 Leave it floating Total current limit Connected to GND, means it follows ISET 8 CHG LED indicator for charging state ON: charging OFF: not charging 9 TS Temp sensor Function disabled, 10 k to GND 10 OUT Output of linear charger, directly connected to 196 HVC 4.35 V fixed voltage feedback and regulated Revision: 22-May-2018 Document Number: 28451 2 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Technical Note www.vishay.com Vishay BCcomponents Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board BOOST IC Texas Instruments' TPS610997 is a synchronous boost converter with ultra low quiescent current. This device is designed for products powered by a power backup solution, for which high efficiency under light load conditions (up to 300 mA at 5 V) and long backup life operation are critical to achieve. The TPS610997 supports a true shutdown function when it is disabled, which disconnects the load from the input supply to reduce the current consumption. TABLE 2 - PIN ASSIGNMENT TPS610997 PIN # PIN NAME A1 VIN FUNCTION IC power supply input Directly connected to 196 HVC, plus terminal B1 SW Switch pin of the converter. It is connected to the inductor C1 EN Enable logic input. Logic high voltage enables the device; logic low voltage disables the device. Do not leave it floating A2 GND Ground B2 VOUT Boost converter output; it is fixed at 5 V C2 FB Voltage feedback of adjustable output voltage. Connect to the center tap of a resistor divider to program the output voltage. Connect to GND pin for fixed output voltage versions GETTING STARTED This section provides information on how to start the mini charger. CHARGING Plug the micro USB terminal into the connector on the board, or supply power to the mini charger through another terminal, such as a power bank, a 5 V output, AC/DC adapter, or even just from the USB port of a PC. A voltage between 4.45 V and 6.45 V is allowed for this input. DISCHARGING DIRECTLY FROM THE 196 HVC ENYCAP Connect the load directly to the ENYCAP storage capacitor's pin J2, pin 1 (+), and pin 5 (GND) (take care to stay within the current and power limits of the charger IC). If power input is removed, the load will be powered only by the 196 HVC backup capacitor. In this mode, the voltage of the 196 HVC capacitor will decrease depending on the power consumption of the load. Typical example: a micro controller unit (MCU) may operate in a working voltage range between 2.7 V and 5 V. TECHNICAL NOTE The voltage of the storage capacitor is permitted to drop to n x 0.8 V; n is the number of cells. For example, a 4.2 V 196 HVC capacitor consists of three cells, so that n x 0.8 V = 2.4 V. In this case, the stored energy of the capacitor cannot be fully used. DISCHARGING VIA A 5 V FIXED OUTPUT BOOST CONVERTER For certain load types, such as a fan or LED, fixed voltage output is necessary. In these cases, connect the load to the output of the boost converter J2, pin 6 (VOUT) and pin 5 (GND), and remove the power source as well. In this mode, with the boost converter, all stored energy can be used. The load can be powered until the storage capacitor is completely discharged. Revision: 22-May-2018 Document Number: 28451 3 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Technical Note www.vishay.com Vishay BCcomponents Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board SCHEMATIC DIAGRAM +5 V J1MICRO USB J2 1 2 3 4 5 8 VBUS DD+ ID GND Shield DD+ Cap_out ISET2 5 VOUT 1 2 3 4 5 6 CON6 GND GND +5 V U1 ISET2 0 3 GND R5 2 k R4 1 k R6 0 IN ISET PRETERM ISET2 GND VSS OUT TS CHG PG NC 10 9 8 5 Cap_out 6 R3 10 k C5 10 F C3 1 F C4 CAP-SUPER - C2 1 F + C1 10 F 1 2 4 7 BQ24095 GND D2 GND GND GND GND R2 +5 V 1.5 k L1 LED 2.2 H Cap_out U2 B1 A1 C1 C8 10 F SW VOUT VIN FB EN GND 5 VOUT B2 C2 A2 C6 10 F D1 C7 10 F R1 1.5 k LED TPS610997 GND TECHNICAL NOTE Fig. 3 - Schematic of mini charger Revision: 22-May-2018 Document Number: 28451 4 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Technical Note www.vishay.com Vishay BCcomponents Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board LAYOUT AND CONNECTION Fig. 4 - PCB layout, mini charger TECHNICAL NOTE BILL OF MATERIAL NAME VALUE SPECIFICATION C1, C5, C6, C7, C8 10 F / 16 V MLCC MANUFACTURER C2, C3 1 F / 35 V MLCC C4 90 F / 4.2 V, MAL219690111E3 196 HVC Vishay D1, D2 LED, SMD 0603 IHLP Vishay J1 Micro USB connector L1 IHLP2020ABER2R2M01, 2.2 H R1, R2 1.5 k, 0603 R3 10 k, 0603 R4 1 k, 0603 R5 2 k, 0603 R6 NC U1 BQ24095 U2 TPS610997 Revision: 22-May-2018 Document Number: 28451 5 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Technical Note www.vishay.com Vishay BCcomponents Power Management Solution With 196 HVC ENYCAPTM for Mini Charger and Fixed Voltage Supply Board INCLUDED MATERIALS ENYCAP mini charger kit for 90 F / 4.2 V 1. Board: 30 mm x 40 mm 2. ENYCAP 196 HVC 90 F / 4.2 V, MAL219690111E3 3. USB - micro USB cable 4. This document Link to the product specification: www.vishay.com/doc?28409 Thank you for using and buying the ENYCAP mini charger board. If you need further information, please contact: Vishay BCcomponents - Aluminum Capacitors Mr. Gerald Tatschl, Dipl. Ing. Sr. Manager Product Marketing Aluminum Capacitors Ebentaler Strasse 140 A - 9020 Klagenfurt, Austria, Europe TECHNICAL NOTE Phone: +43 463 3834 314 Mobile: +43 664 395 00 66 E-mail: hybridstorage@vishay.com Revision: 22-May-2018 Document Number: 28451 6 For technical questions, contact: hybridstorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000