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MAX17710
Energy-Harvesting Charger and Protector
CHG Capacitor
The CHG pin capacitor should be minimized to 0.1 F F
for highest charge efficiency. However, when charging
from a high-voltage source, at least 0.22 F F is required
for shunt stability.
LX Inductor
The LX pin inductor is not required for high-voltage
charge sources. For low-voltage sources, a minimum
inductor value of 0.68 F H is required to prevent the maxi-
mum current rating of the LX pin from being exceeded.
Minimum inductor value is calculated as follows:
LX inductor = V FB-ON x t BOOST-ON /LX IMAX = 1.0V x
850ns/1A = 0.85 F H
Boost Diode
The boost circuit diode must be a high-speed Schottky,
such as the ZLLS410TA from Diodes Incorporated. The
diode must turn on quickly to clamp the LX pin volt-
age rise at 6.0V or lower when the LX driver turns off.
The LX pin can be damaged if the maximum voltage is
exceeded.
Harvest Source Capacitor
The harvest source capacitor must be a minimum of 70
times larger than the CHG pin capacitor to boost the
charge pin to the maximum charge voltage under worst-
case conditions:
Source capacitor = (4.125V) 2 /(0.485V) 2 x
CHG capacitor
This is the minimum size required for operation. Increasing
the size of the harvest source capacitor beyond this
level improves charge circuit efficiency at extremely low
input power (< 10 F W), but care should be taken not to
increase the capacitor so large that the harvest source
cannot overcome the capacitor’s leakage. A maximum
value of 47 F F is recommended.
Table 2 lists boost converter external component values.
Minimum capacitor and inductor values are required for
proper operation of the charge circuit. Recommended
capacitor and inductor values provide optimum charge
efficiency. Components should be sized as close to
the recommended values that the application allows.
Component values below the minimum values, or above
the optimum values, are not recommended.
FB Divider
Charge sources with operational voltages between 1.0V
and 2.0V require boosting, but are too high a voltage to
control the boost circuit efficiently. Under these condi-
tions, a voltage-divider is required to lower the voltage
seen by the FB pin (see Figure 3 ). The divider formed by
R1 and R2 allows the voltage on the FB pin to transition
properly between the FB ON and FB OFF thresholds during
boosting. The value for R2 is calculated as follows:
V HARVEST-ON = F BON x (R1 + R2)/R1
R2 = (V HARVEST-ON - 1.0V) x 500k I
where V HARVEST-ON is the operational voltage of the
harvest source.
Table 2. Boost Converter External Component Values
APPLICATION
CHARGE SOURCE
High voltage
Low voltage < 10 F W
Low voltage > 10 F W
High voltage and low
voltage < 10 F W
High voltage and low
voltage > 10 F W
CHG
CAPACITOR
(μF)
0.22
0.1
0.1
0.22
0.22
MINIMUM LX
INDUCTOR
(μH)
N/A
0.85
0.85
0.85
0.85
RECOMMENDED
LX INDUCTOR
(μH)
N/A
1.5
1.5
1.5
1.5
MINIMUM
HARVEST SOURCE
CAPACITOR (μF)
N/A
7.0
7.0
15.4
15.4
RECOMMENDED
HARVEST SOURCE
CAPACITOR (μF)
N/A
47
7.0
47
15.4
Maxim Integrated
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