19-4996; Rev 0; 10/09
MAX17015 Evaluation Kit
General Description
The MAX17015 evaluation kit (EV kit) is a complete, fully
assembled and tested surface-mount PCB that features
the MAX17015B highly integrated, multichemistry bat-
tery-charger control IC. The MAX17015 EV kit utilizes two
single-package n-channel MOSFETs for high-side and
low-side switching for the MAX17015B internal synchro-
nous step-down converter, and two n-channel MOSFETs
and one p-channel MOSFET for the main power-source
selection.
The MAX17015 EV kit is capable of supplying power to a
system load while simultaneously charging one or more
lithium-ion (Li+) battery cells. During normal operation,
the EV kit circuit automatically selects the ADAPTER
input or the battery as the main power source for sup-
plying power to the system load. If the ADAPTER input
is selected as the main source and the EV kit’s input-
current limit is exceeded, the charge current is reduced
automatically to give priority to the system load.
The EV kit’s input-current limit is set to 4A while the maxi-
mum battery-charge voltage and charge-current thresh-
olds can be configured up to 17.4V and 4A, respectively.
The thresholds can be adjusted by using on-board cir-
cuitry or by connecting analog signals to the respective
test points on the EV kit. A digital output signal (ACOK)
indicates the presence of a valid AC adapter voltage at
the ADAPTER input source.
S
Up to 1.2MHz Switching Frequency
S
Programmable Charge Current Up to 4A
S
Monitors Input/Outputs
Features
S
Analog/PWM Input-Charge-Current Setting
Evaluates: MAX17015B
Analog Input-Charge-Current-Setting Voltage
AC Adapter Input Current
AC Adapter Presence
S
Automatic System Power-Source Selection
S
Up to 17.4V (max) Battery Voltage
S
10V to 25V Adapter-Input Operation
S
Cycle-by-Cycle Current Limit
S
Multichemistry Battery Charger
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX17015EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
ACOK,
IINP,
ISET, TP1–TP4
ADAPTER,
BATT+,
SYS_LOAD
AGND
BATT-, PGND
(x2)
C1
QTY
7
DESCRIPTION
PC mini red test points
DESIGNATION
C4
QTY
1
DESCRIPTION
0.68FFQ 10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61A684K
1FF
Q10%,
10V X5R ceramic
capacitor (0603)
Murata GRM188R61A105K
0.01FF
Q10%,
16V X5R ceramic
capacitor (0603)
Murata GRM188R61C103K
10FF
Q10%,
25V X5R ceramic
capacitor (1206)
Murata GRM31CR61E106K
Not installed, ceramic capacitor
(1206)
Not installed, ceramic capacitor
(0603)
3
1
3
PC large red test points
C7
PC black test point
PC large black test points
1FF
Q10%,
25V X5R ceramic
capacitor (0805)
Murata GRM21BR61E105K
4.7FF
Q10%,
25V X5R ceramic
capacitors (0805)
Murata GRM21BR61E475K
0.1FFQ 10%, 25V X5R ceramic
capacitors (0603)
Murata GRM188R61E104K
C8
1
1
1
C9
1
C2, C5, C6
3
C10
C12
0
0
C3, C11
2
_______________________________________________________________
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.
MAX17015 Evaluation Kit
Evaluates: MAX17015B
Component List (continued)
DESIGNATION
C13, C15
QTY
2
DESCRIPTION
1000pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H102J
Not installed, aluminum electro-
lytic capacitor
200mA, 30V diode (SOD323)
Diodes, Inc. BAT54WS
(Top Mark: L9)
Not installed, diode (SOD323)
2-pin header, 0.1in centers
2FH, 4.3A inductor
Sumida CDR7D28MN-2R0NC
30V, 5.8A n-channel MOSFET
(8 SO)
International Rectifier IRF9410PBF
60V, 115mA n-channel MOSFET
(SOT23)
Vishay 2N7002K (Top Mark: 7K---)
30V, 8.5A n-channel MOSFET
(8 SO)
Fairchild FDS8884
30V, 10A n-channel MOSFET
(8 SO)
Fairchild FDS6690AS
30V, 6.5A/-4.9A dual n-/p channel
MOSFET (8 SO)
International Rectifier IRF7319PBF
DESIGNATION
R1
R2, R10, R22,
R23
R3
R4, R21
R5
R6
R7
R8
R9
R14
R15
R16
R17
R18
R19
R20
U1
—
—
*EP
= Exposed pad.
QTY
1
DESCRIPTION
0.015I
Q1%,
1/2W resistor (1206)
IRC LRC-LRF1206LF-01-R015-F
Not installed, resistors (0603)
R2 and R10 are open; R22 and
R23 are short (PC trace)
1kI
Q1%
resistor (0603)
100kI
Q1%
resistors (0603)
49.9kI
Q1%
resistor (0603)
22.6kI
Q1%
resistor (0603)
113kI
Q1%
resistor (0603)
2MI
Q5%
resistor (0603)
50kI potentiometer (single turn)
Murata PVG3A503C01
150kI
Q1%
resistor (0603)
0I resistor (0603)
0.02I
Q1%,
1/2W resistor (1206)
IRC LRC-LRF1206LF-01-R020-F
30.1kI
Q1%
resistor (0603)
10kI
Q1%
resistor (0603)
140kI
Q1%
resistor (0603)
20kI
Q1%
resistor (0603)
Multichemistry battery charger
(20 TQFN-EP*)
Maxim MAX17015BETP+
Shunt
PCB: MAX17015 EVALUATION
KIT+
C14
0
0
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D1
D2
JU1
L1
1
0
1
1
N1
1
N2
1
N3
1
N4
1
Q1
1
Component Suppliers
SUPPLIER
Diodes, Inc.
Fairchild Semiconductor
International Rectifier
IRC, Inc.
Murata Electronics North America, Inc.
Sumida Corp.
PHONE
805-446-4800
888-522-5372
310-322-3331
361-992-7900
770-436-1300
847-545-6700
www.diodes.com
www.fairchildsemi.com
www.irf.com
www.irctt.com
www.murata-northamerica.com
www.sumida.com
WEBSITE
Vishay
402-563-6866
www.vishay.com
Note:
Indicate that you are using the MAX17015B when contacting these component suppliers.
2
______________________________________________________________________________________
MAX17015 Evaluation Kit
Evaluates: MAX17015B
Quick Start
•
•
•
MAX17015 EV kit
Four voltmeters
Detailed Description of Hardware
The MAX17015 is an evaluation kit (EV kit) for the
MAX17015B that utilizes two single-package MOSFETs
for the MAX17015B internal synchronous step-down
converter.
The MAX17015 EV kit is a complete, fully assembled
and tested surface-mount PCB that demonstrates the
MAX17015B highly integrated, multichemistry battery-
charger controller. The MAX17015B integrates a high-
efficiency, synchronous-rectified step-down DC-DC con-
verter to implement a precision constant-current and
constant-voltage charger. The MAX17015B thermally
optimized high-frequency architecture adjusts the EV
kit’s maximum switching frequency to 1.2MHz to control
the power dissipation in the high-side MOSFET, reducing
output capacitance and inductance.
The MAX17015 EV kit utilizes two single-package n-chan-
nel MOSFETs for high-side and low-side switching for the
MAX17015B synchronous converter, and two n-channel
MOSFETs and one p-channel MOSFET for main power-
source selection. The EV kit is designed to operate from
a single DC power supply that provides 10V to 25V and
5A of current.
The MAX17015 EV kit circuit is capable of supplying
power to a load connected to the SYS_LOAD output
while simultaneously charging the battery pack con-
nected between BATT+ and BATT-. During normal
operation, the EV kit circuit selects the ADAPTER or the
BATT+ input, through MOSFET Q1, as the main power
source for the load connected at SYS_LOAD. Once the
main AC adapter is selected as the power source, the
EV kit circuit monitors the input current through the IINP
connector. The input current is defined as the combined
system-load current and battery-charge current when
the ADAPTER input is the main power source. When
the input current exceeds the EV kit input-current-limit
threshold, the battery-charge current is reduced to give
priority to the system load.
The MAX17015 EV kit’s input-current-limit threshold
is configured to 4A with resistor R1. The EV kit’s cell
count and maximum battery-charge-current thresholds
are programmable with user-adjusted analog signals.
Required Equipment
One 10V to 25V, 5A variable power supply
The MAX17015 EV kit is a fully assembled and tested
surface-mount PCB. Follow the steps below to verify
board operation.
Caution: Do not turn on the power
supply until all connections are completed.
1)
2)
3)
4)
5)
6)
7)
8)
9)
Verify that a shunt is installed across jumper JU1
(battery charging disabled).
Connect the power supply across the ADAPTER and
PGND test points.
Connect a voltmeter across the BATT+ and BATT-
PCB test points.
Connect a voltmeter across the SYS_LOAD and
PGND test points.
Connect a voltmeter across the ISET and AGND test
points.
Connect a voltmeter across the
ACOK
and AGND
test points.
Turn on the power supply.
Set the power-supply voltage to 20V.
Remove the shunt at jumper JU1 (battery charging
enabled).
Procedure
10) Adjust potentiometer R9 until the voltmeter connect-
ed to the ISET pad measures approximately 612mV.
This sets the charge current to 3.5A.
11) Verify the following:
PARAMETER
BATT+ to BATT-
SYS_LOAD
ISET
ACOK
MEASURED OUTPUT (V)
8.4
20
1.23
0
12) The EV kit is ready for additional testing.
_______________________________________________________________________________________
3
MAX17015 Evaluation Kit
Evaluates: MAX17015B
The feedback resistors (R17 and R18) configure the
charge voltage (i.e., cell count) and are initially set for
2-cell evaluation. The charge current can be configured
from 0.14A to 4A by adjusting the analog DC voltage at
the ISET test point connector using potentiometer R9, or
by applying a PWM signal at ISET. The EV kit also fea-
tures an
ACOK
output test point to monitor the presence
of a valid input source connected at ADAPTER.
The MAX17015 EV kit requires a 10V to 25V power
source connected to the ADAPTER and PGND test
points, or a power source with a 6V to 17.4V output-
voltage range connected to the BATT+ and BATT- test
points, to provide power at SYS_LOAD.
In a typical battery-charging application, the battery
pack is connected between the BATT+ and BATT- ter-
minals and an AC adapter power supply is connected
between the ADAPTER and PGND terminals. When the
voltage at the MAX17015B DCIN pin is greater than
BATT+ by 420mV, the MAX17015B BST output drives
the gates of n-channel MOSFETs N1 and Q1-A 5V above
the ADAPTER voltage, selecting ADAPTER as the main
power source for supplying the load at SYS_LOAD. As
long as the ADAPTER power source is present, though
the charger is off, there are forced BST refresh pulses
at a 5ms (min) period at the MAX17015B BST pin to
properly conduct the system-load current through N1
and Q1-A.
The MAX17015 EV kit charges the batteries connected
between the BATT+ and BATT- terminals when the fol-
lowing conditions are met:
1) ADAPTER > (BATT+) + 420mV (300mV falling
hysteresis)
2) SYS_LOAD current is less than the input-current
limit
3) Jumper JU1 is not installed and a DC analog
voltage > 26mV or a PWM signal is present at the
ISET test point
When the ADAPTER power source is removed, the
MAX17015 stops generating BST refresh pulses and N2
forces N1 off. BATT+ is then selected as the SYS_LOAD
power source by conducting the system-load current
through the p-channel MOSFET, Q1-B.
The MAX17015 EV kit features the
ACOK
output-logic
signal that indicates the presence of a valid source con-
nected to the ADAPTER terminal.
ACOK
is pulled low
when the voltage at ADAPTER is greater than 16.9V;
otherwise,
ACOK
is pulled to the MAX17015B reference
output voltage V
AA
(4.2V).
The MAX17015 EV kit input-current limit is set at 4A
using resistor R1. The input current is the sum of the
system-load current and battery-charge current when
the ADAPTER input is the main power source. When
the input current exceeds the input-current limit, the
charging current is reduced to provide priority to the
SYS_LOAD current. As the SYS_LOAD current approach-
es the current-limit threshold, the charge current drops
linearly to zero.
The maximum input-current limit can be set by replacing
sense resistor R1. Use the following equation to select a
new sense-resistor value:
R1(m
Ω
) =
60mV
I
LIMIT
ACOK
Output Logic Signal
Power-Source Selection for System Load
Input-Current Limit
where I
LIMIT
is the input-current limit in amperes and R1
is the value of the sense resistor in milliohms.
Refer to the
Setting Input-Current Limit
section in the
MAX17005B/MAX17006B/MAX17015B IC data sheet for
additional information on setting the input-current limit if
populating resistors at the R2 and R3 PCB pads.
The MAX17015 EV kit supports charging of one or more
series Li+ battery cells. See the following subsections
for details on setting the charge voltage (i.e., battery-
cell count), charge current, and enabling/disabling the
charger.
Battery Charging
4
______________________________________________________________________________________
MAX17015 Evaluation Kit
Evaluates: MAX17015B
Setting Charge Voltage
The MAX17015B battery-charge voltage has a minimum
2.1V FB regulation set-point (V
FB_SETPOINT
) require-
ment. Resistor PCB pads R17 and R18 are available to
set the total battery regulation voltage. Use the following
equation to set the battery regulation voltage:
V
BATT+
R17 = R18 x
−
1
2.1V
Charger Shutdown
Jumper JU1 places the charger in shutdown mode. To
place the charger in shutdown mode, install a shunt
across jumper JU1. To enable the charger, remove the
shunt at jumper JU1 and apply the appropriate analog
DC voltage or PWM signal at ISET. See Table1 for proper
jumper configuration to place the charger in shutdown
mode.
The MAX17015 EV kit features an analog output test
point (IINP) to monitor the adapter current through sense
resistor R1. The measured current is the sum of the
current applied at SYS_LOAD and the battery-charge
current. The system current can be estimated using the
following equation:
V
IINP
I
INPUT
=
R1 x R6 x 2.8mA/V
where V
IINP
is the voltage at the IINP test point, I
INPUT
is the ADAPTER input current, R1 is the value of the
sense resistor (15mI), and R6 is the value of the resis-
tor (22.6kI) connected to the MAX17015B IINP pin and
ground.
The IINP output pad can also be used to monitor the
battery-discharge current. To monitor the battery-dis-
charge current, remove resistor R7 and place a voltage
source between 1V and 5V at the ISET connector. To
limit excessive power dissipated across potentiometer
R9, rotate R9 fully clockwise such that the resistance
measures 0I between terminals 2 and 3.
where R18 is 10kI (typ) and V
BATT+
is the BATT+
battery regulation voltage.
Setting Charge Current
The MAX17015 EV kit charge current can be set up to
4A using an analog DC voltage or PWM signal applied
at the ISET terminal.
Potentiometer R9 adjusts the battery-charge current by
applying the proper analog DC voltage at the ISET pin.
While monitoring the ISET voltage through the EV kit’s
ISET test point, use the following equation to adjust the
maximum battery-charge current to the desired value:
V
ISET
≅
I
CHARGE
x R16 x 4.2
0.24
IINP Output Signal
where V
ISET
is the voltage at the ISET test point, R16 is
the 20mI battery current-sense resistor, and I
CHARGE
is
the desired battery-charge current.
A digital PWM signal with a 128Hz to 500kHz fre-
quency range can be applied at the ISET terminal to
control the battery-charge current. Refer to the
Setting
Charge Current
section in the MAX17005B/MAX17006B/
MAX17015B IC data sheet for proper logic levels and
charge-current setting when using a PWM signal at ISET.
As the duty cycle increases/decreases, the charge cur-
rent linearly increases/decreases.
The EV kit’s actual battery-charge current depends on
the input-current limit and the load connected at SYS_
LOAD. As the battery and SYS_LOAD current exceed
the input-current limit, the charging current is reduced to
provide priority to the SYS_LOAD current.
Table 1. Battery-Charger Control (JU1)
SHUNT
POSITION
Not installed
Installed
EV KIT CHARGE MODE
Charger enabled and charge current
set by R9 or PWM signal at ISET
Charger disabled
_______________________________________________________________________________________
5
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