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MAX17710
Energy-Harvesting Charger and Protector
Regulator Voltage Selection
The SEL1 pin selects at which voltage REG operates.
Connect SEL1 to BATT for 1.8V operation, three-state for
3.3V operation, or connect to GND for 2.3V operation.
Note that the voltage regulation value is latched when
enabled. To change the regulation voltage point, the reg-
PCKP Pin Capacitor Selection
There are several cases when the system might overload
the cell, potentially causing damage. They are prevented
with the PCKP load switch block and external capacitor:
U During startup, when there is an inrush current due to
the application’s load and capacitance.
U When the cell is cold (such as -40 N C), and due to
increased cell resistance, it is unable to support high-
load currents.
U If the system requires a load current higher than can be
supported by the cell alone.
The device provides cell undervoltage protection by
limiting the current from BATT to PCKP and guarantee-
ing that the cell voltage does not fall below 2.15V. In
Table 3. Regulator Output Voltage Selection
SEL1 PIN CONNECTION
Connect to BATT
Open circuit
Connect to GND
addition to voltage protection, the ramp of the PCKP
switch impedance is changed slowly (5ms to full on) to
gradually load the cell and not collapse the voltage on a
room-temperature cell. Because of these protection fea-
tures, an application can now support brief high-current
pulses by including a large capacitance at PCKP. This
allows support for pulse loads many times higher than
that naturally supported by the cell alone.
A large PCKP capacitance can be selected to support
a pulse load even while the cell is very cold, and would
normally be incapable of supporting a significant load.
Choose this capacitor according to Table 4 or the follow-
ing equation:
C PCKP = I TASK x t TASK /(3.7 - V MIN )
where:
I TASK is the current required to sustain a required task,
t TASK is the time duration of the task, and V MIN is the
minimum voltage of the load doing the task.
This equation assumes that the BATT impedance is high
and cannot support the load.
REG PIN OUTPUT VOLTAGE (V)
1.8
3.3
2.3
Table 4. PCKP Pin Capacitor Values by Application
V MIN
3.0
3.0
2.8
2.8
2.3
2.3
t TASK (ms)
5
5
5
5
5
5
I TASK (mA)
8
4
5
2.5
5
10
C PCKP (μF)*
100
50
28
14
18
36
*Capacitance value tolerances need to be considered.
Maxim Integrated
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