19-5975; Rev 1; 10/11
MAX17710 Evaluation Kit
Evaluates: MAX17710
General Description
The MAX17710 evaluation kit (EV kit) is a fully assem-
bled and tested PCB that contains all the components
necessary to evaluate the performance of the MAX17710
energy-harvesting charger and protector. The EV kit
features the THINERGY
M
micro-energy cell (MEC) from
Infinite Power Solutions, Inc. (IPS), a solid-state, recharge-
able, thin-power solution. Solar cells are installed on the
EV kit as the power source for an energy-harvesting
application. The solar cells demonstrate low-power
charging of the MEC with ambient light. The IC can
regulate and charge from various energy-harvesting
sources that can be added externally.
The EV kit is a self-powered board. The EV kit output
charges the THINERGY MEC with current as low as 1FA.
The EV kit provides test points to monitor the inputs and
outputs, and jumpers to test the various settings. An LED
is included on the CHG output to indicate if the boost is
operating. The IC is available in a 12-pin UTDFN package
with an exposed pad.
Features
S
Self-Powered by On-Board Solar Cells
S
THINERGY Micro-Energy Cell (MEC) Included
S
Variable Switching Frequency Adjusts for Input
Power Levels
S
Various Test Points Included for Evaluation
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Component List
DESIGNATION
AC+, AE, BATT+,
CHG, FB, LCE,
PCKP, REG,
SEL2, SOLAR+
AC-, GND (x4)
BATT
QTY
DESCRIPTION
DESIGNATION
C5
QTY
1
DESCRIPTION
47FF
Q20%,
6.3V X7R ceramic
capacitor (1210)
Murata GRM32ER70J476M
1000pF
Q10%,
50V X7R
ceramic capacitor (0603)
Murata GRM188R71H102K
10V, 570mA Schottky diode
(SOD323)
Diodes Inc. ZLLS410TA
Surface-mount Schottky diode
array (SOT363)
Diodes Inc. BAS70DW-04-7-F
Green LED (0603)
Not installed, zener diode
(SOD123)
6-pin right-angle male header
4-pin (1 x 4) header
3-pin headers
2-pin headers
10
Red multipurpose test points
5
1
Black multipurpose test points
THINERGY1mAh micro-energy
cell (MEC)
IPS MEC101-10PES
Not installed, ceramic
capacitors (0603)
10FF
Q10%,
6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
1FF
Q10%,
16V X7R ceramic
capacitor (0603)
Murata GRM188R71C105K
0.1FF
Q10%,
50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
C6
1
D1
1
C1, C24
0
D2
D5
D6
J1
JU1
JU2, JU4
JU3, JU5, JU6,
JU7
1
1
0
1
1
2
4
C2
1
C3
1
C4, C7
2
THINERGY is a registered trademark of Infinite Power
Solutions, Inc.
_________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX17710 Evaluation Kit
Evaluates: MAX17710
Component List (continued)
DESIGNATION
L1
LX
N1
R1
R2
R3
R4, R5, R7
R6
R9
QTY
1
0
1
1
0
1
3
1
1
DESCRIPTION
1.5FH, 1.5A inductor
Murata LQM2HPN1R5MG0
Not installed, 1-pin header
N-channel digital FET
Fairchild FDV301N
51kI
Q5%
resistor (0603)
Not installed, resistor (0603)
10kI
Q5%
resistor (0603)
1MI
Q5%
resistors (0603)
10I
Q5%
resistor (0603)
150I
Q5%
resistor (0603)
—
—
8
1
U1
1
DESIGNATION
R22
S1–S4
SOLAR1,
SOLAR2, SOLAR3
QTY
1
4
3
DESCRIPTION
620I
Q5%
resistor (0603)
Momentary pushbutton
switches
Amorphous solar cells (single)
China Solar RS-2510
Energy-harvesting charger
and protector (12 UTDFN-EP)
Maxim MAX17710G+U
Shunts
PCB: MAX17710
EVALUATION KIT
Component Suppliers
SUPPLIER
China Solar Ltd.
Diodes Incorporated
Fairchild Semiconductor
Infinite Power Solutions
Murata Electronics North America, Inc
PHONE
86-755-8351-5659
805-446-4800
888-522-5372
303-749-4800
770-436-1300
www.diodes.com
www.fairchildsemi.com
www.infinitepowersolutions.com
www.murata-northamerica.com
WEBSITE
www.solar-china.com
Note:
Indicate that you are using the MAX17710 when contacting these component suppliers.
Quick Start
•
MAX17710 EV kit
•
Oscilloscope
•
Precision voltmeter
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
point. The power-source ground can connect to any
GND test point.
4) Connect the oscilloscope probe to the CHG test point.
The CHG test point is the output of the boost regula-
tor. Set the time division to 200ms and the voltage
division to 1V.
5) Under ambient light, the battery charges with a small
current. The oscilloscope displays voltage pulses
from the boost regulator. The boost output pulses
because of the solar cells’ limited current.
6) Increase the ambient light source on the solar cells and
observe the increase in frequency of pulses at the CHG
test point.
7) To turn on the internal regulator and enable the bat-
tery pack output, press the S1 button.
8) Install shunts on jumpers JU5 and JU6. LED D5
pulses with the voltage pulses at the CHG test point.
D5 is a visual indication of the boost output.
9) To measure the MEC charging current, observe the
voltage across resistor R6. A precision voltmeter is
needed. The charging current can be as low as 1FA and
the voltmeter needs the precision to be able to pulse-
average over several seconds of data. An average volt-
age of 10FV indicates a 1FA average charging current.
Required Equipment
Procedure
1) Verify that two shunts are installed on jumper JU1
(pins 1-2 and 3-4). Solar cells SOLAR1, SOLAR2,
and SOLAR3 are connected in parallel as the power
source.
2) Install a shunt in the 2-3 position on jumper JU2 to
connect the IC to the on-board MEC through a 10I
resistor.
Important:
The MEC (BATT) must always
be connected before the solar cell or damage could
result. Always connect JU2 first and disconnect JU2
last.
3) Install a shunt on jumper JU3 to connect the on-
board solar cells as the power source. The solar cell
voltage can be monitored on the SOLAR+ test point.
If verification with an external energy-harvesting
source is required, remove the shunt from JU3 and
apply the external power source to the SOLAR+ test
_________________________________________________________________
Maxim Integrated Products
2
MAX17710 Evaluation Kit
Evaluates: MAX17710
Table 1. Solar Power Options (JU1)
JUMPER
SHUNT
POSITION
1-2
3-4
JU1
1-2* and 3-4*
2-3 and Open
*Default
position.
DESCRIPTION
SOLAR1 and SOLAR2 are connected in parallel as the power source.
SOLAR2 and SOLAR3 are connected in parallel as the power source.
SOLAR1, SOLAR2, and SOLAR3 are connected in parallel as the power
source.
SOLAR2 is connected as the power source.
INPUT POWER
Medium
Medium
High
Low
Table 2. Jumper Table (JU2–JU7)
JUMPER
SHUNT
POSITION
1-2
JU2
DESCRIPTION
Connects the IC charger output to the MEC (BATT) directly. To prevent possible IC damage,
JU2 must always be the first jumper installed and the last jumper removed.
Connects the IC charger output to the MEC (BATT) through a 10I resistor (R6). Use this setting
to measure the charger current. To prevent possible IC damage, JU2 must always be the first
jumper installed and the last jumper removed.
The IC is not connected to the battery.
The on-board solar cells power the EV kit.
For low-voltage DC external energy-harvesting sources, remove this shunt and apply the power
source to the SOLAR+ test point.
See the
Regulator Output Voltage (SEL1)
section.
Connects LED D5 to the battery pack output (PCKP test point).
Disconnects LED D5 from the PCKP test point. The PCKP output can be used to power an
external load.
Enables the LED indicator.
Disables the LED indicator.
Connects the resistor-divider to FB.
Does not connect the resistor-divider to FB.
2-3
Not installed*
Installed
JU3
JU4
JU5
Not installed*
Not installed*
Installed
Not installed*
Installed
Not installed*
Installed
Not installed*
JU6
JU7
*Default
position.
Detailed Description of Hardware
The MAX17710 EV kit is a fully assembled and tested
PCB that contains all the components necessary to
evaluate the MAX17710 energy-harvesting charger and
protector. The IC is available in a 12-pin UTDFN package
with an exposed pad. The EV kit circuit uses an efficient
boost controller to regulate and charge the on-board
THINERGY MEC (BATT). The EV kit has three on-board
solar cells that are connected in parallel. On-board
jumpers and test points allow external power sources to
power the IC. The IC has low reverse leakage to prevent
discharge of the on-board energy cell. Ambient light can
charge the on-board MEC with current as low as 1FA
200ms/div
Figure 1. CHG Test Point Voltage Using On-Board Solar Cells
as the Power Source
_________________________________________________________________
Maxim Integrated Products
3
MAX17710 Evaluation Kit
Evaluates: MAX17710
The CHG test point monitors the CHG pin. The CHG test
point is connected to the output of the boost regulator
and the CHG pin is the input to the battery charger. The
IC charges the MEC based off the voltage on the CHG
test point. The power sources to the CHG test point can
come from solenoid, piezo, mechanical, or RF sources,
and must exceed the MEC voltage. When CHG exceeds
the MEC voltage by 50mV, the IC uses the CHG supply
to charge the on-board MEC. The IC is designed to use
input supplies from energy-harvesting sources, which
are highly variable, poorly regulated, and usually power-
limited. Apply the variable input supply source to the
AC+ and AC- test points. The power source is rectified
and supplied to the CHG test point through the full-wave
bridge diode (D2).
For power sources that are lower than the battery
voltage, such as solar or the above-mentioned sources,
the IC features a boost converter to step up the voltage to
charge the on-board MEC. The output of the boost is the
CHG test point. The IC uses the voltage on the CHG test
point to charge the MEC. An additional power source can
be present on CHG through the AC+ and AC- test points
while the boost is active.
Figure 1 shows the CHG test-point voltage observed on an
oscilloscope with ambient light using the on-board
solar cells as the power source. The number of pulses
increase as the EV kit is brought closer to the light source
and decrease when taken away from the light source.
The on-board power source is a parallel connection of
three solar cells. The voltage can be monitored on the
SOLAR+ and GND test points. The start-up voltage for
the IC boost is approximately 750mV at the FB pin. To
supply an external power source, remove the shunt from
jumper JU3 and apply the power source to the SOLAR+
and GND test points.
The EV kit features the THINERGY micro-energy cell
(MEC) from IPS as the on-board energy storage cell.
The MEC101 included on the EV kit is roughly the size of
a postage stamp and is soldered directly to the board.
The BATT footprint can also accommodate the MEC201.
Caution:
The MEC case is conductive. To protect the
MEC, do not touch the MEC with conductive material.
The IC has a regulator output and battery pack output
(PCKP) to provide power to external loads. The IC PCKP
test point provides the MEC voltage to external loads
while the REG test point provides a regulated voltage
(Table 3). External unregulated loads from the MEC
should always be connected through the PCKP test
Charger
point. External loads connected directly from the MEC
can cause irreversible damage to the MEC if the voltage
goes too low.
LED Indicator On Pack Power
The D5 LED is connected through a digital FET at the
PCKP test point. The LED blinks as pulses are generated
at the CHG test point. The LED is a visual display that the
boost regulator is operating.
The EV kit provides various pushbutton switches and test
points to evaluate the device. There are two regulators
internal to the IC, which are available through AE and
LCE. AE controls the default regulator and LCE controls
the low-current regulator.
Regulator Output Enable (AE)
The IC features a default regulator that can be enabled
by the AE signal. Press the S1 switch to connect PCKP
and enable the default regulator. Press the S2 switch
to disconnect PCKP and disable the default regulator
output. The output voltage is selected by jumper JU4
(see Table 3). If the MEC voltage drops below 2.15V,
the AE and PCKP outputs are disabled until a charger
is applied.
Low-Current Mode Enable (LCE)
The IC features a low-current regulator that reduces
the quiescent current by a factor of 5. The low-current
regulator can be enabled by the LCE and AE signals.
To enter the low-current mode, first turn on the default
regulator by pressing S1, then press S3 to enable the
low-current regulator, and finally turn off the default regu-
lator by pressing S2. Afterwards, press S4 to disable the
low-current regulator. If low-current mode is enabled,
pressing S1 enables the default regulator, but pressing
S2 switches back to the low-current regulator if originally
enabled. If the MEC voltage drops below 3V, the AE and
PCKP outputs are disabled until a charger is applied.
Regulator Output Voltage (SEL1)
Table 3 shows the regulator output options. SEL1 is con-
nected to jumper JU4. The regulator output is locked
when the regulator is active. To change the regulator
output voltage, first change the setting on jumper JU4 to
obtain the desired output voltage (Table 3), then press
S2 and S4 to disable both the default and low-current
regulators. Lastly, press S1 to enable the default regula-
tor and optionally S3 to enable the low-current regulator.
The regulator output voltage can be monitored on the
REG test point and outputs the new voltage.
Logic Inputs
Internal Boost
Power Sources
On-Board Micro-Energy Cell (BATT)
MEC Pack Power
Table 3. Regulator Output Voltage (SEL1)
SEL1
BATT
GND
Unconnected
*Default
position.
JU4 SHUNT POSITION
1-2
2-3
Not installed*
REG (V)
1.8
2.3
3.3
_________________________________________________________________
Maxim Integrated Products
4
MAX17710 Evaluation Kit
Evaluates: MAX17710
Figure 2. MAX17710 EV Kit Schematic
_________________________________________________________________
Maxim Integrated Products
5
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