Power Management Solution With 196 HVC ENYCAPTM
for Mini Charger and Fixed Voltage Supply Board
TECHNICAL NOTE
Technical Note
www.vishay.com Vishay BCcomponents
Revision: 22-May-2018 3Document Number: 28451
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
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.
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.
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.
TABLE 2 - PIN ASSIGNMENT TPS610997
PIN # PIN NAME FUNCTION
A1 VIN 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