EVAL-ADP5090 Datasheet, PDF (3/8 Pages) Analog Devices – Evaluation Board for the ADP5090 Ultralow Power Boost Regulator

EVAL-ADP5090 User Guide
SETTING UP THE EVALUATION BOARD
POWERING UP THE EVALUATION BOARD
The ADP5090 evaluation board is fully assembled and tested.
Use the following setup procedures before applying power to
the evaluation board,
Jumper Settings
Table 1 describes the jumper settings.
Table 1. Jumper Settings
Jumper
State or
Connection
J1 (DIS_SW) SYS
GND
J2 (PGOOD) Not
applicable
J3 (RDIV)
MPPT
Floating
Function
Disables the main boost
Enables the main boost
Pull high when the SYS voltage
ramps up to preset the SETPG
rising threshold
With MPPT sensing function
Without MPPT sensing function;
provide an external voltage at
the CBP pin as the MPPT voltage
Input Power Source Connection
Energy harvesting power sources are high impedance sources.
As Figure 2 shows, a source meter configured as a current
source with a voltage limit set to the open circuit voltage of the
harvester is the best way to simulate the harvester. For a low
output impedance power supply (voltage source), it is necessary
to simulate the impedance of the harvester with a physical
resistor, R, between the supply and the VIN pin. If the input
current source includes a voltage meter, use the meter to
monitor the input voltage as follows:
1. Connect the positive terminal of the power source to the
VIN terminal (J6) on the evaluation board.
2. Connect the negative terminal of the power source to the
GND terminal (J6) on the evaluation board.
If the input power supply does not include a current meter, connect
a current meter in series with the input power supply as follows:
1. Connect the external series resistor of the power source to
the positive terminal (+) of the current meter.
2. Connect the negative terminal of the power source to the
GND terminal (J6) on the evaluation board.
3. Connect the negative terminal (−) of the current meter to
the VIN terminal (J6) on the evaluation board.
UG-708
Output Load Connection
Before connecting the load to the EVAL-ADP5090 evaluation
board, ensure that the SYS voltage is higher than the end of the
cold-startup threshold (VSYS_TH, 1.93 V typical), or that the
PGOOD signal is high. If the load includes a current meter or if
the current is not measured, connect the load directly to the
evaluation board as follows:
1. Connect the positive load connection (+) to the SYS
terminal (J4) on the evaluation board.
2. Connect the negative load connection (−) to the GND
terminal (J4) on the evaluation board.
If a current meter is used, connect it in series with the load as
follows:
1. Connect the positive terminal (+) of the current meter to
the SYS terminal (J4) on the evaluation board.
2. Connect the negative terminal (−) of the current meter to
the positive terminal (+) of the load.
3. Connect the negative terminal (−) of the load to the GND
terminal (J4) on the evaluation board.
Storage Elements Connection
The EVAL-ADP5090 can charge some types of energy storage
elements, such as rechargeable batteries, super capacitors, and
conventional capacitors. In general, the storage elements
maintain constant power or peak power of the system that
cannot directly come from the input source. It is necessary to
consider any significant leakage current of batteries and super
capacitors. For applications information, refer to the ADP5090
data sheet.
SUPER CAPACITOR
OR RECHARGEABLE
BATTERY
–
+
R
–
+
CURRENT SOURCE VOLTAGE SOURCE
WITH VOLTAGE LIMIT
Figure 2. Setup for the EVAL-ADP5090 Evaluation Board
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