Evaluates: MAX8904 MAX8904 Evaluation Kit

MAX8904 Evaluation Kit
Evaluates: MAX8904
General Description
The MAX8904 evaluation kit (EV kit) is a fully assembled
and tested PCB that evaluates the MAX8904 powermanagement IC. The MAX8904 EV kit operates from an
input supply range of 3.4V to 13.2V and is controlled by
an I2C interface. The MAX8904 includes five step-down
converters (1V2, 1V8, 3V3, 5V0, and ADJ), a WLED
step-up converter (BST), a current-limited switch (CLS),
a current-sense amplifier (CSA) with differential inputs,
an active-low open-drain comparator (CMP), and an
8-bit GPIO port. The MAX8904 also controls an external
n-MOSFET for input overvoltage protection (13.5V, typ)
and an external p-MOSFET for reverse-polarity protection (up to -28V) of downstream circuits. The I2C interface supports output-voltage setting of the ADJ power
rail and BST regulator (voltage-source mode), WLED
current setting for the BST regulator (WLED current regulator mode), GPIO control, and enable/disable of ADJ,
5V0, BST, CSA, CMP, and CLS blocks.
The MAX8904 EV kit also includes WindowsM 2000-,
Windows XPM-, and Windows VistaM-compatible software that provides a simple graphical user interface
(GUI) for exercising the features of the MAX8904. To
evaluate the MAX8904, order the MINIQUSB+ command
module along with the MAX8904 EV kit.
Features
S Input-Voltage Range of 3.4V to 13.2V
S 1MHz, Up to 90% Efficient, Synchronous DC-DC
Step-Down Converters
S Power Converters 1V2, 1V8, and ADJ Operated
Out-of-Phase with Respect to 3V3 and 5V0
S 667kHz Step-Up Converter Provides Up to 32V
Output for Driving Up to Eight WLEDs
S Internal Compensation on All Power Converters
S Fast Line- and Load-Transient Responses
S Internal Soft-Start and Short-Circuit Protection on
All Power Converter Outputs
S Input Overvoltage and Reverse-Polarity Protection
S 250ms Fault Timer-Based Protection for Overload
and Short Circuit
S I2C Serial Interface for On/Off Control, Output
Voltage, WLED Current, GPIO Setting, and Fault
Monitoring
S < 10µA Standby Current
S Compact, 56-Pin 7mm x 7mm TQFN Package
S Fully Assembled and Tested
Ordering Information
PART
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
TYPE
MAX8904EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
C1
1
0.22FF Q10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C224KA01D
C5
1
2.2FF Q10%, 16V X7R ceramic
capacitor (0805)
Taiyo Yuden EMK212BJ225KG
C2, C10
2
1FF Q10%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J105KA01D
C6
1
1FF Q10%, 50V X7R ceramic
capacitor (1206)
Taiyo Yuden UMK316B7105KL
C3
1
1FF Q10%, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J105K
C7, C15, C18,
C21, C24
5
4.7FF Q10%, 25V X7R ceramic
capacitors (0805)
Taiyo Yuden TMK212BJ475KG
C4
1
1FF Q10%, 16V X7R ceramic
capacitor (0805)
Taiyo Yuden EMK212BJ105KG
C8_1, C8_2
2
22FF Q20%, 4V X5R ceramic
capacitors (0603)
Taiyo Yuden AMK107BJ226MA
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5160; Rev 0; 2/10
MAX8904 Evaluation Kit
Evaluates: MAX8904
Component List (continued)
DESIGNATION
QTY
C9, C12, C13,
C16, C19, C22
6
0.1FF Q10%, 16V X7R ceramic
capacitors (0402)
Taiyo Yuden EMK105BJ104KV
C11
1
680FF Q20%, 16V aluminum
electrolytic capacitor
SANYO 16CE680AX
6
22FF Q10%, 6.3V X5R ceramic
capacitors (1206)
Taiyo Yuden JMK316BJ226ML
C25
0
Not installed, ceramic capacitor
(0603)
C26
1
0.022FF Q10%, 25V X7R ceramic
capacitor (0402)
Taiyo Yuden TMK105BJ223KV
1
0.01FF Q10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
C14_1, C14_2,
C17, C20_1,
C20_2, C23
C27
DESCRIPTION
C28
1
220pF Q10%, 50V X5R ceramic
capacitor (0402)
Taiyo Yuden UMK105BJ221KV
D1, D2
2
40V, 0.5A Schottky diodes
(SOD123)
ON Semi MBR0540T1G
D3–D10, D11
9
Surface-mount LEDs, blue
(0603)
Kingbright APT1608PBCA
D12
1
D13
DESCRIPTION
1
10FH, 1.2A, 145mI DCR
inductor
TOKO DE3518 Series
1127AS-100M
2
4.7FH, 1.75A, 60mI DCR
inductors
TOKO DE3518 Series
1127AS-4R7M
2
4.3FH, 2.65A, 70mI DCR
inductors
TOKO DE4518 Series
1124BS-4R3M
L6
1
10FH, 1.75A, 120mI DCR
inductor
TOKO DE4518 Series
1124BS-100M
Q1
1
30V dual n-/p-MOSFET (8 SO)
Fairchild FDS8958B
R1, R3
2
10I, 1/16W Q1% resistors
(0402)
R2
1
0.015I, 1/4W Q1% resistor
(1206)
Vishay WSL1206R0150FEA
L1
L2, L4
L3, L5
R4
1
0I Q1% resistor (0805)
7
0I Q1% resistors (0402)
Surface-mount LED, green
(0603)
Kingbright APT1608CGCK
R7, R25, R26,
R27
0
Not installed, resistors (0402)
R8–R11
4
100I Q1% resistors (0402)
Surface-mount LED, yellow
(0603)
Kingbright APT1608SYCK
R12–R19
8
100kI Q1% resistors (0402)
R20–R24
5
10kI Q1% resistors (0402)
R28
1
24.9kI Q1% resistor (0402)
U1
1
Power-management IC
(56 TQFN-EP*)
Maxim MAX8904ETN+
—
9
Shunts, 2 positions
Sullins STC02SYAN or equivalent
—
1
PCB: MAX8904 EVALUATION
KIT+
D14
1
J1
1
2 x 8 vertical male header
J2
1
1 x 8 single-row female
receptacle
Samtec SSW-108-01-T-S
10
QTY
R5, R6, R29,
R30–R33
Surface-mount LED, red (0603)
Kingbright APT1608SRCP
JU1, JU2.0–
JU2.7, JU3
2 1
DESIGNATION
2-pin headers, 0.1in
Sullins PEC36SAAN or
equivalent
*EP = Exposed pad.
Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Fairchild Semiconductor
888-522-5372
www.fairchildsemi.com
Kingbright Corporation
909-468-0500
www.kingbrightusa.com
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Samtec, Inc.
800-726-8329
www.samtec.com
SANYO Electric Co., Ltd.
619-661-6835
www.sanyodevice.com
Sullins Electronics Corp.
760-744-0125
www.sullinselecstronics.com
Taiyo Yuden
847-925-0888
www.yuden.co.jp
TOKO
847-297-0070
www.toko.com
ON Semiconductor
888-743-7826
www.onsemi.com
Vishay
402-563-6866
www.vishay.com
Note: Indicate that you are using the MAX8904 when contacting these component suppliers
MAX8904 EV Kit Files
FILES
DESCRIPTION
INSTALL.EXE
Installs the EV kit files on your computer
MAX8904.EXE
Application program
UNINST.INI
Uninstalls the EV kit software
TROUBLESHOOTING_USB.PDF
Quick Start
•
Recommended Equipment
Variable 14V power supply capable of supplying 5A
of output current
•
Voltmeter
•
User-supplied Windows 2000, Windows XP, or
Windows Vista PC with a spare USB port
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system.
Procedure
The MAX8904 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Caution: Do not turn on the power
supply until all connections are completed.
1)Visit www.maximintegrated.com/evkitsoftware to
download the latest version of the EV kit software,
8904Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by running the INSTALL.EXE program inside the tempoMaxim Integrated
USB driver installation help file
rary folder. The program files are copied and icons
are created in the Windows Start | Programs menu.
3) Carefully connect the MINIQUSB+ command module with the MAX8904 EV kit by aligning the
16-pin connector J1 and 8-pin receptacle J2 of the
MAX8904 EV kit with the 16-pin receptacle J3 and
8-pin header J4 of the MINIQUSB+ interface board,
respectively.
4) Connect the USB cable from the PC to the
MINIQUSB+ command module. A Building Driver
Database window pops up in addition to a New
Hardware Found message if this is the first time the
EV kit board is connected to the PC. If a window is
not seen that is similar to the one described above
after 30s, remove the USB cable from the board and
reconnect it. Administrator privileges are required
to install the USB device driver on Windows. Refer
to the TROUBLESHOOTING_USB.PDF document
included with the software if you have any problems
during this step.
5) Follow the directions of the Add New Hardware
Wizard to install the USB device driver. Choose the
Search for the best driver for your device option.
Specify the location of the device driver to be
3
MAX8904 Evaluation Kit
Evaluates: MAX8904
C:\Program Files\MAX8904 (default installation
directory) using the Browse button.
6) Preset the power supply to 7.2V. Turn off the power
supply.
7) Connect the positive lead of the 7.2V power supply
to the VIN pad. Connect the negative lead of the
7.2V power supply to the GND pad.
8) Turn on the power supply.
9) Start the MAX8904 program by opening its icon in
the Start | Programs menu. The EV kit software
main window appears, as shown in Figure 1.
10) Normal device operation is verified when Command
Module Connected, Device Connected is displayed at the top-left side of the MAX8904 EV kit
main window (Figure 1).
11) Verify that the voltage is 1.2V at the 1V2 pad.
12) Verify that the voltage is 1.8V at the 1V8 pad.
13) Verify that the voltage is 3.3V at the 3V3 pad.
14) Verify that the voltage is 5V at the 5V0 pad.
15) Choose 4.000 from the VADJSP (V) group box to
set the ADJ output voltage to 4V and check the
VADJEN checkbox and press the Write button in
the ENABLE/SHUTDOWN group box to turn on the
ADJ step-down converter.
16) Verify that the voltage is 4V at the ADJ pad.
17) Verify that the jumper JU1 shunt is installed.
18)Choose 10 from the BSTCSP (mA) group box
to set the LED current to 10mA. Choose 32 from
the BSTVSP (V)-current mode group box to set
the overvoltage threshold for BST current-mode
operation to 32V. Check the BSTEN checkbox and
press the Write button in the ENABLE/SHUTDOWN
group box to turn on the BST step-up converter.
19) Verify that blue LEDs D3–D10 turn on.
20) Switch to the GPIO Configuration tab, as shown in
Figure 2. Choose Open-Drain/HiZ from the GPIO
Config drop-down list for GPIO4–GPIO7.
21) Verify that LEDs D11–D14 turn on.
Detailed Description of Software
User-Interface Panel
The MAX8904 EV kit uses the MINIQUSB+ command
module for an I2C interface to control the MAX8904 configurations. The EV kit software displays two tabs to set
the MAX8904 configurations, Power Controller, Status
4 and GPIO Configuration. Changes to the controls followed by a Write/Write All update the appropriate registers of the MAX8904. After any write or read operation,
the related command and data sent are shown in the
top-middle box.
Power Controller, Status Tab
The MAX8904 includes five step-down converters (1V2,
1V8, 3V3, 5V0, and ADJ), a WLED step-up converter
(BST), a current-limited switch (CLS), a current-sense
amplifier (CSA) with differential inputs, and an activelow open-drain comparator (CMP). Their configuration
can be set by using the EV kit software. The MODE
group box provides control of CSA gain, ADJ, and BST
operating mode, CSA overcurrent-fault detection, and
overvoltage protection. The output voltage of the ADJ
and BST regulator (voltage-source mode), and WLED
current for the BST regulator (current-regulator mode),
are set through the VADJSP(V), BSTCSP(mA), and
BSTVSP(V) group boxes.
ENABLE(Checked) allows the host processor to
enable/disable the individual block when needed.
SHUTDOWN(Unchecked) works in conjunction with the
MAX8904 SHDN pin to program which function block is
turned off in the event of a power failure.
The Fault Status, Overload Fault Status, and VOK
Fault Register read-only registers monitor the MAX8904
operating state and fault status. They indicate any overload, short circuit, power-ok, input overvoltage fault,
input overcurrent fault, or overtemperature. The STATUS
indicators require a Read if a fault or event has occurred,
in which case the corresponding indicator flag turns red.
Press the CLRFLTS button to clear the status bit and pull
FLT back to high if the fault or event is no longer present.
Press the REARM button to rearm fault detections.
GPIO Configuration Tab
The GPIO Configuration tab sheet allows the MAX8904
to configure the GPIO0–GPIO7 to the following modes:
• Schmitt-trigger input with an internal 1MI pullup
resistor to GPIOPWR
• Open-drain output, with an internal 10kI pullup resistor off-state, capable of sinking up to 20mA current
• Open-drain output with high-impedance state, capable of sinking up to 20mA current
• High-impedance output
The status of eight GPIO bits can be read/written by
the GPIO Data register. The GPIOs can also perform
LED dimming, which is achieved by setting PWM, PWM
Bank, and GPIO PWM Control boxes.
Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
Figure 1. MAX8904 EV Kit Software (Power Controller, Status Tab)
Maxim Integrated
5
MAX8904 Evaluation Kit
Evaluates: MAX8904
Figure 2. GPIO Configuration Tab
6 Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
Simple I2C/SMBus Commands
There are two methods for communicating with the
MAX8904, through the normal user-interface panel
(Figure 1), or through the SMBus commands available
by choosing the Options | 2-wire Interface menu item
from the menu bar. The I2C/SMBus commands allow
low-level I2C commands to be sent and are typically
used for debugging purposes. The Maxim Command
Module Interface (CmodGUIForm) window (Figure 3)
pops up and includes a 2-wire interface tab that allows
for execution of the simple I2C commands.
It is necessary to first properly identify the slave address
of the MAX8904. This is done by pressing the Hunt for
active listeners button. The PWREN pin must be driven
high prior to searching for the active listeners, since
PWREN enables the 3.3V step-down converter, which
powers the I2C pullup resistors and the internal I2C circuitry.
The WriteByte and ReadByte protocols can be used
to send and receive 8-bit commands directly to the
MAX8904 registers. Refer to the MAX8904 IC data sheet
for command-byte format. For the Write Byte protocol,
the register address is entered in the Command Byte
combo box, and the 8-bit data contents are entered in
the Data Out combo box. For the Read Byte protocol,
the register address is entered in the Command Byte
combo box, and the register contents are read back into
the Data In edit box. Pressing the Execute button sends
the command. The PASS/FAIL indicator flag indicates a
successful transaction by turning green.
The SMBus dialog boxes accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers should
be prefixed by $ or 0x. Binary numbers must be exactly
eight digits. See Figure 3 for an illustration of this tool.
Figure 3. Maxim Command Module Interface (CmodGUIForm) Window
Maxim Integrated
7
MAX8904 Evaluation Kit
Evaluates: MAX8904
Detailed Description of Hardware
Step-Down Converters
The MAX8904 has four fixed-voltage step-down converters (1V2, 1V8, 3V3, and 5V0) and an adjustable voltage
step-down converter ADJ. Table 1 lists the output voltages and currents for each converter. The ADJ converter
output voltage can be programmed from 3V to 5.067V in
33.3mV increments using the MAX8904 EV kit software.
The PWREN logic-high input turns on the 1V2, 1V8, 3V3,
and 5V0 power converters. Once the 5V0 converter is
in regulation, it can be disabled by the 5V0EN bit in the
Enable register. The ADJ converter can be enabled by
checking the ADJEN bit in the Enable register.
BST Step-Up Converters
The MAX8904 EV kit contains a BST step-up converter
that can operate in either current mode or voltage mode.
When the Current Mode radio button in the BSTIV group
box is selected, select the value from 1mA to 63mA from
the BSTCSP(mA) group box to set the current flowing
through D3–D10. Select a value from the BSTVSP(V)current mode group box to set the overvoltage threshold for WLED protection.
Click on the Voltage Mode radio button to operate the
BST converter in voltage mode. The BST output voltage
can be programmed by the BSTVSP(V) from 12.5V to
18.7V with 100mV increments. In voltage mode, the BST
converter can provide up to 63mA output current. Ensure
that the jumper JU1 shunt is not installed and the jumper
JU3 shunt is installed to short PCS to GND in voltage
mode.
Current-Limit Switch
The current-limited switch (CLS) allows the MAX8904
to control the amount of current that an external device
draws from the input-voltage source. The CLS is connected between the input-voltage source and the target
peripheral device. It provides at least 450mA current and
is protected under short-circuit conditions. A short-circuit
condition that lasts greater than 250ms latches the CLS
Table 1. Step-Down Converter Output
Voltage and Output Current
8 OUTPUT
VOLTAGE (V)
1V2
1.2
CURRENT (mA)
600
1V8
1.8
975
3V3
3.3
1250
5V0
5
800
ADJ
3 to 5.067
1500
off. The CLS can be enabled/disabled by checking/
unchecking the CLSEN bit in the Enable register.
Current-Sense Amplifier
The current-sense amplifier (CSA) measures the
MAX8904 input current and provides an analog voltage
output. The CSOUT voltage is given by the following
equation:
VCSOUT = A V × R2 × IIN
where AV = 20V/V or 40V/V (programmed by the CSAG
bit in the Mode register), R2 = 0.015I, and IIN = input
current. The CSA allows full-scale (1.2V) output for 4A
(20V/V) and 2A (40V/V) currents.
The CSFLGEN bit is used to enable/disable the CSA
input overcurrent-fault-detection feature. If CSFLGEN
is set to Enable, the MAX8904 sets the OCIN bit in the
Fault Status register and pulls FLT to low when an input
overcurrent is sensed at CSOUT. The input overcurrentfault detection is disabled if CSFLGEN is set to Disable.
The CSA can be enabled or disabled by checking/
unchecking the CSAEN bit in the Enable register.
Open-Drain Comparator
The open-drain comparator (CMP) is an uncommitted,
14V, open-drain output comparator with 20mA of sinking capability. The CMP can be enabled or disabled
by checking/unchecking the CMPEN bit in the Enable
register.
Overvoltage and Reverse-Polarity Protection
The MAX8904 supports input overvoltage protection
(OVP) at 13.5V (typ) by controlling an external n-MOSFET
and reverse-polarity protection (down to -28V) of downstream circuits by controlling an external p-MOSFET.
As the VIN voltage rises above 4V, the overvoltage
charge-pump gate drive is powered up and OVGATE
turns on the Q1 n-MOSFET. Once VIN approaches
13.5V, OVGATE is discharged, turning off the Q1 n-MOSFET and disconnecting the downstream circuit from the
high input. When the input voltage goes negative, the
MAX8904 pulls RPGATE to OVPWR voltage to turn off the
external p-MOSFET. When the input voltage rises in the
positive direction to a maximum of 30V, RPGATE pulls
low and turns on the Q1 p-MOSFET.
Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
GPIO Port
The MAX8904 EV kit features an 8-bit GPIO port controller with PWM capability. The GPIO0–GPIO7 can be configured by using the MAX8904 EV kit software as:
• Schmitt-trigger input with an internal 1MI pullup
resistor to GPIOPWR
• Open-drain output, with an internal 10kI pullup resistor off-state, capable of sinking up to 20mA current
• Open-drain output with high-impedance state, capable of sinking up to 20mA current
• High-impedance output
The D11–D14 LEDs are controlled by GPIO4–GPIO7 on
the MAX8904 EV kit. Their brightness can be controlled
by selecting PWM Enable and setting the PWM duty
cycle through PWM Bank Control. Each LED can also
be switched between two intensities by toggling its PWM
Bank assignment between Bank 0 and Bank 1.
A VOK fault occurs either when an output voltage fails
to soft-start or due to overload/short-circuit conditions
under normal operation, causing the output voltage to fall
below its VOK threshold. When a VOK fault occurs on a
particular converter or CLS, press the Read button in the
VOK Fault Register box to see the corresponding _OK
indicator flag turns red.
Power Enable Input (PWREN)
The Overload register indicates if any overload occurs
on the power converters or CLS. The corresponding
_OL indicator flag turns red after pressing Read in the
Overload Fault Status group box.
Shutdown Input (SHDN)
The Fault Status register reports all the system faults
(fault on BST, VOK, overload, overtemperature, input
overcurrent, or input overvoltage). Refer to the MAX8904
IC data sheet for more information. The FLT output goes
low immediately after any fault detection.
Driving PWREN logic input high turns on 1V2, 1V8, 3V3,
and 5V0 default power rails. The 5V0 converter can also
be turned on/off through the Enable register once it is
in 5V regulation. The 1V2, 1V8, and 3V3 power rails can
only be turned off by driving PWREN logic input low.
The MAX8904 features an emergency shutdown input
(SHDN) to turn off the function blocks preselected by
the Shutdown register under power-fail conditions.
When an active-low SHDN is asserted, the function
blocks whose corresponding bits are programmed to
0 in the Shutdown register are immediately turned off,
and the blocks whose bits in the Shutdown register are
programmed to 1 remain enabled. The function blocks
include CSA, CMP, BST, ADJ, 5V0, and CLS.
Fault Handling
The MAX8904 EV kit software provides all the fault information in the STATUS group box. The three read-only
Maxim Integrated
registers, Fault Status, Overload Fault Status, and
VOK Fault Register monitor the MAX8904 fault status. They indicate any VOK, overload, or system fault.
The STATUS indicators require a Read if a fault has
occurred, in which case the corresponding indicator flag
turns red. A second Read clears the status bit if the fault
is no longer present.
Press the Read All button to update all the fault information in the Status registers.
User-Supplied I2C Interface
To use the MAX8904 EV kit with a user-supplied I2C
interface, connect the SDA, SCL, and GND lines from
the user-supplied I2C interface to the SDA, SCL, and
GND pads on the EV kit. Remove pullup resistors R21
and R22 and install resistors R26 and R27 for the usersupplied I2C interface. For resistors R26 and R27, 2.2kI
is recommended.
9
MAX8904 Evaluation Kit
Evaluates: MAX8904
VINT
5
R4
0Ω
1
R5
0Ω
R2
0.015Ω
CLSOUT
VIN
VSYS
LVROUT
Q1
6
4
3
C27
0.01µF
7 8
C11
680µF
2
14
53
R32 0Ω 54
55
56
4
R31
0Ω
R30
0Ω
R29
3
2
0Ω
VSYS
8
C15
L3 4.7µF
4.3µ
H
ADJ
7
6
C13
0.1µF
GPIO[0:7]
PWREN
TP1
SHDN
FLT
TP2
1
3
5
J1
2
4
6
7
8
9
10
12
14
16
11
13
15
SDA
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GND
VSYS
50
C4
1µF
49
C6
1µF
JU1
D1
D2
GND R3
10Ω
TP4
51
CMPO
D3 D4D5D6D7 D8D9 D10
28
VSYS
R24
10kΩ
CMPI
R23
10kΩ
CSOUT
12
CLSIN
CS-
1V2LX
CS+
OVGATE
1V2BST
1V2FB
OVPWR
RPGATE
1V8IN
ADJIN
1V8LX
ADJLX1
ADJLX2
1V8BST
1V8FB
ADJBST
ADJFB
3V3IN
U1
BSTIN
MAX8904
3V3LX
BSTSW
3V3BST
3V3FB
BSTLX
5V0IN
BSTFB
5V0LX
PCS
5V0BST
5V0FB
CMPO
TEST
38
1
39
SHDN
SHDN
SDA
R21
10kΩ
FLT
R20
10kΩ
35
40
41
R28 24.9kΩ C28
220pF
GPIOPWR
PWREN
NOTE: J2 IS FOR MECHENICAL PURPOSE
PWREN
SCL
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
SDA
FLT
SHDN
PWREN
42
C8_1
C8_2
22µF
45
46
C18
4.7µF L4
4.7µH
47
C16
0.1µF
REF GND
C12
0.1µF
10
1V8
C17
22µF
GND
31
VSYS
C21
4.7µF
L5
4.3µH
32
33
3V3
C19
0.1µF
30
C20_1
C20_2
22µF
16
C24
4.7µF L6
18
GND
VSYS
5V0
10µH
17
C22
0.1µF
C23
22µF
15
GND
43
C25
OPEN
19
20
R6
0Ω
C10
1µF
TP6
3V3
5V0
R7 R8
OPEN 100Ω
R9 R10
D1 100Ω 100Ω
4
D13 D12
21
22
23
24
25
26
27
5V0
R11
100Ω
D11
GPIO[0:7]
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
JU2
EP
11
GND
VSYS
44
3V3
CSOUT
1V2
C9
0.1µF
36
CMPI
JU2.7 JU2.6 JU2.5 JU2.4 JU2.3 JU2.2 JU2.1 JU2.0
R19
100kΩ
AGND
3V3
R22
10kΩ
L2
4.7µH
37
SCL
34
VSYS
C7
4.7µF
R25
OPEN
29
J2
13
LVRPWR LVROUT LVRIN5V
CLSOUT
1V2IN
JU3
52
R26
OPEN
C3
1µF
L1
10µH
48
SCL
TP3
9
C14_1
C14_2
22µF
BST
R27
OPEN
5
C5
2.2µF
C2
1µF
C1
0.22µF
R33
0Ω
C26
0.022µF
R1
10Ω
R12
100kΩ
R18 R17 R16 R15 R14 R13
100k 100k 100k 100k 100k 100k
Figure 4. MAX8904 EV Kit Schematic
10 Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
4362Mils
2802Mils
1.0”
Figure 5. MAX8904 EV Kit Component Placement
4362Mils
2802Mils
1.0”
Figure 6. MAX8904 EV Kit PCB Layout—Top Layer 1
Maxim Integrated
11
MAX8904 Evaluation Kit
Evaluates: MAX8904
4362Mils
2802Mils
1.0”
Figure 7. MAX8904 EV Kit PCB Layout—PGND Layer 2
4362Mils
2802Mils
1.0”
Figure 8. MAX8904 EV Kit PCB Layout—Power Layer 3
12 Maxim Integrated
MAX8904 Evaluation Kit
Evaluates: MAX8904
4362Mils
2802Mils
1.0”
Figure 9. MAX8904 EV Kit PCB Layout—Routing Layer 4
4362Mils
2802Mils
1.0”
Figure 10. MAX8904 EV Kit PCB Layout—GND Layer 5
Maxim Integrated
13
MAX8904 Evaluation Kit
Evaluates: MAX8904
4362Mils
2802Mils
1.0”
Figure 11. MAX8904 EV Kit PCB Layout—Bottom Layer 6
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
14
© 2010
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.