MAX17015EVKIT [MAXIM]
Automatic System Power-Source Selection;
| 型号： | MAX17015EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Automatic System Power-Source Selection |
| 文件： | 总8页 (文件大小：1139K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4996; Rev 0; 10/09
MAX17015 Evaluation Kit
General Description
Features
S Analog/PWM Input-Charge-Current Setting
S Up to 1.2MHz Switching Frequency
S Programmable Charge Current Up to 4A
S Monitors Input/Outputs
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.
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
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.
S Multichemistry Battery Charger
S Fully Assembled and Tested
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.
Ordering Information
PART
TYPE
MAX17015EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
ACOK, IINP,
ISET, TP1–TP4
0.68FFQ 10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61A684K
7
PC mini red test points
C4
C7
C8
C9
1
1
1
1
ADAPTER,
BATT+,
SYS_LOAD
3
PC large red test points
1FF Q10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61A105K
AGND
1
3
PC black test point
BATT-, PGND
(x2)
0.01FF Q10%, 16V X5R ceramic
capacitor (0603)
Murata GRM188R61C103K
PC large black test points
1FF Q10%, 25V X5R ceramic
capacitor (0805)
Murata GRM21BR61E105K
C1
1
3
2
10FF Q10%, 25V X5R ceramic
capacitor (1206)
Murata GRM31CR61E106K
4.7FF Q10%, 25V X5R ceramic
capacitors (0805)
Murata GRM21BR61E475K
C2, C5, C6
C3, C11
Not installed, ceramic capacitor
(1206)
C10
C12
0
0
Not installed, ceramic capacitor
(0603)
0.1FFQ 10%, 25V X5R ceramic
capacitors (0603)
Murata GRM188R61E104K
_______________________________________________________________ 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
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.015I Q1%, 1/2W resistor (1206)
IRC LRC-LRF1206LF-01-R015-F
1000pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H102J
R1
1
0
C13, C15
C14
2
0
1
Not installed, resistors (0603)
R2 and R10 are open; R22 and
R23 are short (PC trace)
R2, R10, R22,
R23
Not installed, aluminum electro-
lytic capacitor
R3
R4, R21
R5
1
2
1
1
1
1
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)
200mA, 30V diode (SOD323)
Diodes, Inc. BAT54WS
(Top Mark: L9)
D1
D2
0
1
Not installed, diode (SOD323)
2-pin header, 0.1in centers
R6
JU1
R7
R8
2FH, 4.3A inductor
L1
1
Sumida CDR7D28MN-2R0NC
50kI potentiometer (single turn)
Murata PVG3A503C01
R9
1
30V, 5.8A n-channel MOSFET
(8 SO)
International Rectifier IRF9410PBF
N1
1
R14
R15
1
1
150kI Q1% resistor (0603)
0I resistor (0603)
0.02I Q1%, 1/2W resistor (1206)
IRC LRC-LRF1206LF-01-R020-F
60V, 115mA n-channel MOSFET
(SOT23)
R16
1
N2
N3
N4
Q1
1
1
1
1
Vishay 2N7002K (Top Mark: 7K---)
R17
R18
R19
R20
1
1
1
1
30.1kI Q1% resistor (0603)
10kI Q1% resistor (0603)
140kI Q1% resistor (0603)
20kI Q1% resistor (0603)
30V, 8.5A n-channel MOSFET
(8 SO)
Fairchild FDS8884
30V, 10A n-channel MOSFET
(8 SO)
Fairchild FDS6690AS
Multichemistry battery charger
(20 TQFN-EP*)
Maxim MAX17015BETP+
U1
1
—
1
1
Shunt
30V, 6.5A/-4.9A dual n-/p channel
MOSFET (8 SO)
International Rectifier IRF7319PBF
PCB: MAX17015 EVALUATION
KIT+
—
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Diodes, Inc.
805-446-4800
888-522-5372
310-322-3331
361-992-7900
770-436-1300
847-545-6700
402-563-6866
www.diodes.com
www.fairchildsemi.com
www.irf.com
Fairchild Semiconductor
International Rectifier
IRC, Inc.
www.irctt.com
Murata Electronics North America, Inc.
Sumida Corp.
www.murata-northamerica.com
www.sumida.com
www.vishay.com
Vishay
Note: Indicate that you are using the MAX17015B when contacting these component suppliers.
2
______________________________________________________________________________________
MAX17015 Evaluation Kit
Quick Start
Required Equipment
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.
•ꢀ MAX17015 EV kit
•ꢀ One 10V to 25V, 5A variable power supply
•ꢀ Four voltmeters
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.
Procedure
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) Verify that a shunt is installed across jumper JU1
(battery charging disabled).
2) Connect the power supply across the ADAPTER and
PGND test points.
3) Connect a voltmeter across the BATT+ and BATT-
PCB test points.
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.
4) Connect a voltmeter across the SYS_LOAD and
PGND test points.
5) Connect a voltmeter across the ISET and AGND test
points.
6) Connect a voltmeter across the ACOK and AGND
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.
test points.
7) Turn on the power supply.
8) Set the power-supply voltage to 20V.
9) Remove the shunt at jumper JU1 (battery charging
enabled).
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
MEASURED OUTPUT (V)
8.4
20
1.23
0
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.
ACOK
12) The EV kit is ready for additional testing.
_______________________________________________________________________________________
3
MAX17015 Evaluation Kit
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.
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.
ACOK Output Logic Signal
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
Power-Source Selection for System Load
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.
output voltage V (4.2V).
AA
Input-Current Limit
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.
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 maximum input-current limit can be set by replacing
sense resistor R1. Use the following equation to select a
new sense-resistor value:
60mV
R1(mΩ) =
I
LIMIT
where I
is the input-current limit in amperes and R1
LIMIT
is the value of the sense resistor in milliohms.
The MAX17015 EV kit charges the batteries connected
between the BATT+ and BATT- terminals when the fol-
lowing conditions are met:
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.
1) ADAPTER > (BATT+) + 420mV (300mV falling
hysteresis)
Battery Charging
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.
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
4
______________________________________________________________________________________
MAX17015 Evaluation Kit
Setting Charge Voltage
The MAX17015B battery-charge voltage has a minimum
2.1V FB regulation set-point (V ) 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:
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.
FB_SETPOINT
V
BATT+
R17 = R18 x
−1
2.1V
IINP Output Signal
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:
where R18 is 10kI (typ) and V
battery regulation voltage.
is the BATT+
BATT+
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
IINP
I
=
INPUT
R1x R6 x 2.8mA/V
where V
is the voltage at the IINP test point, I
INPUT
IINP
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.
I
x R16 x 4.2
CHARGE
V
≅
ISET
0.24
where V
is the voltage at the ISET test point, R16 is
ISET
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.
the 20mIbattery current-sense resistor, and I
the desired battery-charge current.
is
CHARGE
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.
Table 1. Battery-Charger Control (JU1)
SHUNT
EV KIT CHARGE MODE
POSITION
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.
Charger enabled and charge current
Not installed
set by R9 or PWM signal at ISET
Installed
Charger disabled
_______________________________________________________________________________________
5
MAX17015 Evaluation Kit
Figure 1. MAX17015 EV Kit Schematic
6
______________________________________________________________________________________
MAX17015 Evaluation Kit
1.0’’
1.0’’
Figure 4. MAX17015 EV Kit PCB Layout—Ground Layer
Figure 2. MAX17015 EV Kit Component Placement Guide—
Component Side
1.0’’
1.0’’
Figure 5. MAX17015 EV Kit PCB Layout—Power Layer
Figure 3. MAX17015 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
7
MAX17015 Evaluation Kit
1.0’’
1.0’’
Figure 7. MAX17015 EV Kit Component Placement Guide—
Solder Side
Figure 6. MAX17015 EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
©
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