_______________________________________________________________ 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.
MAX16927 Evaluation Kit
Evaluates: MAX16927
19-5602; Rev 0; 10/10
General Description
The MAX16927 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that provides the
voltages and features required for display systems in auto-
motive applications. The EV kit contains a buck converter,
boost converter, Cuk converter, positive gate-voltage linear
regulator, negative gate-voltage linear-regulator control-
ler, DAC-adjustable positive VCOM buffer, and DAC-
adjustable negative VCOM buffer.
The EV kit operates from +6V to +16V or +3V to +5.5V DC
supply voltage ranges. The EV kit’s default input range is
configured to +6V to +16V. The buck converter (VCC3)
is configured for a +3.3V output providing at least 2A.
The boost converter (VSH) is configured for a +7V output
providing at least 200mA. The Cuk converter (VSL) is
configured for a -7V output providing at least 100mA. The
positive gate-voltage linear regulator (VGH) is configured
for a +12V output providing at least 20mA. The negative
gate-voltage linear-regulator controller (VGL) is configured
for a -12V output providing at least 20mA. The negative
VCOM buffer (VCOML) is DAC adjustable between -1V
and +1V and can source or sink 10mA. The positive VCOM
buffer (VCOMH) is DAC adjustable between +2.5V and
+4.5V and can source or sink 100mA.
The EV kit provides an on-board USB interface circuit
to communicate with the SPIK interface circuits in the
MAX16927 IC.
The EV kit also includes WindowsM 2000-, Windows XPM-,
and Windows VistaM-compatible software that provides
the user interface for exercising the features of the IC. The
program is menu driven and offers a graphical user inter-
face (GUI).
Features
S +6V to +16V Single-Supply Operation
S +3V to +5.5V Single-Supply Operation
S Output Voltages
+3.3V Output at 2A (VCC3 Buck Converter)
+7V Output at 200mA (VSH Boost Converter)
-7V Output at 100mA (VSL Cuk Converter)
+12V Output at 20mA (VGH Positive
Gate-Voltage Linear Regulator)
-12V Output at 20mA (VGL Negative
Gate-Voltage Linear-Regulator Controller)
S DAC-Controlled VCOM Buffers
-1V to +1V DAC-Adjustable VCOML (±10mA), or
+2.5V to +4.5V DAC-Adjustable VCOMH
(±100mA)
S 2.1MHz PWM Switching Frequency (Buck
Converter)
S 1.2MHz PWM Switching Frequency (Boost and
Cuk Converters)
S All Output Voltages are Resistor Adjustable
(Except for the Buck Converter)
S On-Board USB Interface Circuit Generates
SPI-Compatible Signals
S USB-PC Connection and Power (Cable Included)
S PCB Header for User-Supplied SPI-Compatible
Signals
S Evaluates the MAX16927GTM/V+ in a 48-Pin
TQFN (7mm x 7mm x 0.8mm) Package with an
Exposed Pad
S Windows 2000-, Windows XP-, and Windows Vista
(32-Bit)-Compatible Software
S Fully Assembled and Tested
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
SPI is a trademark of Motorola, Inc.
Ordering Information
+Denotes lead(Pb)-free and RoHS compliant.
PART TYPE
MAX16927EVKIT+ EV Kit
MAX16927 Evaluation Kit
Evaluates: MAX16927
2 ______________________________________________________________________________________
Component List
DESIGNATION QTY DESCRIPTION
C1, C4, C5,
C22, C24 5
10FF Q20%, 25V X7R ceramic
capacitors (1210)
Murata GRM32DR71E106M
C2, C3, C14,
C17, C25, C27 6
0.1FF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
C6, C12, C13,
C16, C21, C29 6
1FF Q10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E105K
C7 1
4.7FF Q20%, 50V X7R ceramic
capacitor (1210)
Murata GRM32ER71H475M
C8, C11 2
220pF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H221K
C9, C10 2
22pF Q5%, 50V C0G ceramic
capacitors (0805)
Murata GRM2165C1H220J
C15 1
47FF Q20%, 25V aluminum
electrolytic capacitor
(6.3mm x 6mm)
SANYO 25CE47AX
C18, C19 2
22FF Q20%, 25V X7R ceramic
capacitors (1210)
Murata GRM32ER71E226M
C20, C32 2
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
C23, C34 0Not installed, ceramic capacitors
(1210)
C26 1
4.7FF Q20%, 25V X5R ceramic
capacitor (1206)
Murata GRM31CR71E475M
C30, C31, C33,
C35, C36 0Not installed, ceramic capacitors
(0805)
C37, C38 0Not installed, ceramic capacitors
(1206)
C101,
C103–C110,
C117, C121
11
0.1FF Q10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
DESIGNATION QTY DESCRIPTION
C102, C113,
C115 3
10FF Q20%, 6.3V X5R ceramic
capacitors (0805)
Murata GRM21BR60J106M
C111, C112 2
10pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
C114,
C122–C127 7
1FF Q10%, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A105K
C116 1
2.2FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J225K
C118, C119 2
22pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J
C120 1
3300pF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H332K
D1, D2, D3 3
3A, 30V Schottky diodes
(M-FLAT)
Toshiba CMS02(TE12L,Q)
(Top Mark: S2)
D4 1
2A, 50V fast-recovery diode
(SMB)
Fairchild ES2A
D5, D6 2
200mA, 100V dual diodes
(SOT23)
Fairchild MMBD4148SE
(Top Mark: D4)
Central Semi CMPD7000+
(Top Mark: C5C)
D7 1 Red SMT LED (0603)
D101 1 Green SMT LED (0603)
FB101 0 Not installed, ferrite bead—short
(PC trace) (0603)
J1 1 12-pin header
JU1, JU2 22-pin headers
JU4–JU8,
JU14–JU17 93-pin headers
JU9 1 4-pin, 3-way jumper
JU10–JU13 4 5-pin, 4-way jumpers
L1, L2 25.6FH, 2A inductors
Sumida CDRH6D26-5R6NC
MAX16927 Evaluation Kit
Evaluates: MAX16927
_______________________________________________________________________________________ 3
Component List (continued)
*EP = Exposed pad.
/V denotes an automotive qualified part.
µMAX is a registered trademark of Maxim Integrated Products,
Inc.
DESIGNATION QTY DESCRIPTION
L3 1 3FH, 3A inductor
Sumida CDRH6D28-3R0
L4 1 2.2FH, 9A inductor
Würth 744314330
L5 0 Not installed, inductor—short (PC
trace) (CDRH6D28)
N1 1
20V, 0.9A n-channel MOSFET
(SOT23)
Fairchild FDV305N
(Top mark 305)
P1, P101 2
-20V, -2.4A p-channel MOSFETs
(3 SuperSOT)
Fairchild FDN304P_NL
(Top Mark: 304)
Q1 1
npn bipolar transistor (SOT23)
Fairchild MMBT3904_NL
(Top Mark: 1A)
R1, R10, R31 3100kI Q5% resistors (0603)
R2 1 100kI Q1% resistor (0603)
R3 1 715kI Q1% resistor (0603)
R4, R5 247kI Q5% resistors (0603)
R6 1 110kI Q1% resistor (0603)
R7 1 10kI Q1% resistor (0603)
R8, R9, R16,
R18, R19,
R103
610kI Q5% resistors (0603)
R11 1 71.5kI Q1% resistor (0603)
R12 1 12.1kI Q1% resistor (0603)
R13 1 6.8kI Q5% resistor (0603)
R14 1 619kI Q1% resistor (0603)
R15 1 51.1kI Q1% resistor (0603)
R17 1 2kI Q5% resistor (0603)
R21, R34 20I Q5% resistors (0805)
R22, R23,
R26–R30, R35,
R36
0Not installed, resistors (0805)
R24 1 0I Q5% resistor (1206)
R25 0 Not installed, resistor—short (PC
trace) (1206)
R32, R33 2499kI Q1% resistors (0603)
DESIGNATION QTY DESCRIPTION
R37, R101 20I Q5% resistors (0603)
R102 1 220I Q5% resistor (0603)
R104 1 2.2kI Q5% resistor (0603)
R105 1 1.5kI Q5% resistor (0603)
R106, R107 227I Q5% resistors (0603)
R108 1 1kI Q5% resistor (0603)
U1 1
TFT-LCD power supply
(48 TQFN-EP*)
Maxim MAX16927GTM/V+
U101 1
32-bit microcontroller
(68 QFN-EP*)
Maxim MAXQ2000-RAX+
U102 1 EEPROM, 93C46-type 3-wire
(8 SO)
U103 1 UART-to-USB converter
(32 TQFP)
U104 1
3.3V, 300mA regulator (5 SOT23)
Maxim MAX8888EZK33+
(Top Mark: ADQC)
U105 1
2.5V, 120mA regulator (5 SC70)
Maxim MAX8511EXK25+
(Top Mark: ADV)
U106, U107,
U108 3
Low-voltage level translators
(10 FMAXM)
Maxim MAX1840EUB+
USB 1 Type-B right-angle female USB
connector
Y101 1
16MHz crystal
Hong Kong X’tals
SSM16000N1HK188F0-0
Y102 1
6MHz crystal
Hong Kong X’tals
SSL60000N1HK188F0-0
— 1 USB-A male to USB-B male
cable, 6ft (beige)
— 16 Shunts
— 1 PCB: MAX16927 EVALUATION
KIT+
MAX16927 Evaluation Kit
Evaluates: MAX16927
4 ______________________________________________________________________________________
Quick Start
Required Equipment
• MAX16927EVkit(USBcableincluded)
• User-supplied Windows 2000, Windows XP, or
Windows Vista PC with a spare USB port
• +6Vto+16V,1ADCpowersupply
• Voltmeter
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 under-
lined refers to items from the Windows operating system.
The test procedure assumes that Windows XP SP2 is
being used. Similar steps are required for the other sup-
ported operating systems.
Procedure
The EV kit is fully assembled and tested. Follow the
steps below to verify board operation. Caution: Do not
turn on the power supply until all connections are
completed.
1) Visit www.maxim-ic.com/evkitsoftware to down-
load the latest version of the EV kit software,
16927Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP files.
2) Install the EV kit software on the computer by run-
ning the INSTALL.EXE program inside the temporary
folder. The program files are copied and icons are
created in the Windows Start | Programs menu.
3) Verify that shunts are installed in their default posi-
tions, as shown in Table 1.
4) Turn on the power supply and set it to +6V; disable
the power supply.
5) Connect the positive terminal of the power supply
to the IN3 pad on the EV kit. Connect the negative
terminal of the power supply to the PGND3 pad.
6) Connect the USB cable from the PC to the EV kit
board. A New Hardware Found window pops up
when installing the USB driver for the first time. 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.
7) Follow the directions of the Found New Hardware
window to install the USB device driver. Manually
specify the location of the device driver to be
C:\Program Files\MAX16927 (default installation
directory) using the Browse button. During device
driver installation, Windows may show a warning
Component Suppliers
Note: Indicate that you are using the MAX16927 when contacting these component suppliers.
MAX16927 EV Kit Files
SUPPLIER PHONE WEBSITE
Central Semiconductor Corp. 631-435-1110 www.centralsemi.com
Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com
Hong Kong X’tals Ltd 852-35112388 www.hongkongcrystal.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
SANYO Electric Co., Ltd. 619-661-6835 www.sanyo.com
Sumida Corp. 847-545-6700 www.sumida.com
Toshiba America Electronic Components, Inc. 949-623-2900 www.toshiba.com/taec
Würth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com
FILE DESCRIPTION
INSTALL.EXE Installs the EV kit files on the computer
MAX16927.EXE Application program
FTD2XX.INF USB driver file
UNINST.INI Uninstalls the EV kit software
USB_Driver_Help.PDF USB driver installation help file
MAX16927 Evaluation Kit
Evaluates: MAX16927
_______________________________________________________________________________________ 5
message indicating that the device driver Maxim
uses does not contain a digital signature. This is not
an error condition and it is safe to proceed with instal-
lation. Refer to the USB_Driver_Help.PDF document
included with the software for additional information.
8) Enable the power supply.
9) Start the EV kit software by opening its icon in the
Start | Programs menu.
10) Observe as the program automatically detects the
connection of the device and starts the main pro-
gram. After successful connection, the EV kit software
main window appears in the upper-left corner of the
window, as shown in Figure 1.
11) Select Enabled in the +3.3V (EN3) radio group box.
This enables the buck (+6V to +16V to +3.3V) DCDC.
12) Verify that the VCC3 buck-converter output (VCC3) is
+3.3V.
13) Select Enabled in the Input Pwr (ENP) radio group
box.
14) Select Seq 0: SPI determines which regulator is on
in the Power Sequencing (EN2, EN1) radio group
box.
15) Select Enabled in the VSH radio group box.
16) Verify that the VSH boost-converter output (VSH) is
+7V.
17) Select Enabled in the VSL radio group box.
18) Verify that the VSL Cuk converter output (VSL) is -7V.
19) Select Enabled in the VSLS radio group box.
20) Verify that the VSLS sequenced Cuk converter output
(VSLS) is -7V.
21) Select Enabled in the VGH radio group box.
22) Verify that the VGH positive gate-voltage linear-regu-
lator output (VGH) is +12V.
23) Select Enabled in the VGL radio group box.
24) Verify that the VGL negative gate-voltage linear-
regulator controller output (VGL) is -12V.
25) Select Positive in the DAC Direction radio group
box.
26) Enter 7F into the DAC Value edit box.
27) Verify that the VCOML buffer output (VCOML) is +1V.
28) The EV kit is now ready for additional testing.
Table 1. Default Shunt Positions
JUMPER SHUNT POSITION PIN CONNECTION EV KIT FUNCTION
JU1 Not installed PGOOD not con-
nected to ENP ENP controlled by JU10
JU2 Installed FLT to LLT_ FLT J1-6 and the on-board SPI interface circuit (LED indication is active)
JU4 1-2 LXN to R21 Charge pumps powered by LXN
JU5 1-2 VSL to D6, pin 2 Negative charge pump refers to VSL
JU6 2-3 FBN to R2/R3 divider FBN receives feedback from VSL through R2/R3 divider
JU7 1-2 VCOMN to VSL VCOMN is powered by VSL
JU8 1-2 SYNC to AVL DCDC3 skip mode enabled under light load
JU9 1-2 SSEN to INA Spread spectrum enabled
JU10 1-2 ENP to LLT_ENP On-board SPI interface controls ENP
JU11 1-2 EN1 to LLT_EN1 On-board SPI interface controls EN1
JU12 1-2 EN2 to LLT_EN2 On-board SPI interface controls EN2
JU13 1-2 EN3 to LLT_EN3 On-board SPI interface controls EN3
JU14 2-3 CS to LLT_ CS On-board SPI interface controls CS
JU15 2-3 CLK to LLT_CLK On-board SPI interface controls CLK
JU16 2-3 DIN to MAXQ_DOUT On-board SPI interface controls DIN
JU17 2-3 DOUT to LLT_DIN On-board SPI interface controls DOUT
MAX16927 Evaluation Kit
Evaluates: MAX16927
6 ______________________________________________________________________________________
Figure 1. MAX16927 EV Kit Software Main Window
MAX16927 Evaluation Kit
Evaluates: MAX16927
_______________________________________________________________________________________ 7
Detailed Description of Software
Note: Text in bold indicates user-selectable features in
the MAX16927 EV kit software.
Graphic User Interface (GUI) Panel
The GUI shown in Figure 1 displays the EV kit software
main window. This window provides a convenient means
to control the device. Use the mouse or press the Tab
key to navigate through the GUI controls. The correct
SPI write operation is generated to update the device’s
internal memory registers when any of these controls are
executed.
The EV kit software main window (Figure 1) divides
the EV kit software functions into logical sections: The
+3.3V (EN3) and Input Pwr (ENP) sections, the Power
Sequencing (EN2, EN1) section, the VSH, VSL, VSLS,
VGL, and VGH sections, the VCOMH and VCOML
sections, and the Over Temperature and Fault Condition
displays. +3.3V (EN3) enables or disables the +3.3V buck
converter. Input Pwr (ENP) enables or disables all the
outputs on the EV kit, except for the buck-converter out-
put. Power Sequencing (EN2, EN1) selects the power-on
sequence. VSH, VSL, VSLS, VGL, and VGH control the
VSH, VSL, VSLS, VGL, and VGH, respectively. VCOMH
and VCOML control the VCOMH or VCOML directions
and outputs.
The bottom-left status bar on the main window provides
the USB interface circuit connectivity status. The bottom-
right status bar indicates the EV kit operational status.
Software Startup
Upon startup of the program, the EV kit software auto-
matically searches for the USB interface circuit connec-
tion. The EV kit enters the normal operating mode when
the USB connection is detected. The +3.3V (EN3) is
Enabled and the Input Pwr (ENP) and VSH, VSL, VSLS,
VGL, and VGH are Disabled. The Power Sequencing
(EN2, EN1) is set to Seq 0: SPI determines which
regulator is on. The VCOMH and VCOML are Off.
The DAC Direction is set to Positive. The DAC Value
is set to 00. Both the Over Temperature and the Fault
Condition display Off. The bottom-left status bar indi-
cates Hardware: Connected, and the bottom-right
status bar indicates EV Kit Operational. If the USB con-
nection is not detected, the software prompts the user to
retry, exit the program, or enter the demo mode.
Demo Mode
The EV kit software can enter the demo mode when the
USB connection is not detected, by selecting Cancel on
the EV kit Software Interface Circuit pop-up window
(Figure 2). The software can also enter the demo mode
at any time by selecting the Options | Demo Mode
menu item in the main window. When in demo mode, all
software communication to the EV kit circuit is disabled;
however, most of the software GUI is functional. Demo
mode allows the user to evaluate the software without
hardware connectivity. To exit demo mode, select the
Options | Demo Mode menu item.
+3.3V (EN3)
The +3.3V (EN3) radio group box enables or disables
the buck converter. When +3.3V (EN3) is Enabled,
VCC3 is On and all 32 bits in the register are set low.
When +3.3V (EN3) is Disabled, VCC3 is Off and all 32
bits in the register are set high.
Input Pwr (ENP)
The Input Pwr (ENP) radio group box enables or dis-
ables the device except for the buck converter. When
+3.3V (EN3) and Input Pwr (ENP) are Enabled, VSH,
VSL, VSLS, VGL, and VGH are controlled by their
respective Enabled/Disabled commands. When Input
Pwr (ENP) is Disabled, VSH, VSL, VSLS, VGL, and VGH
are Off, regardless of their respective Enabled/Disabled
commands.
Power Sequencing (EN2, EN1)
The Power Sequencing (EN2, EN1) radio group box
selects the EV kit power sequence. When the Seq 0: SPI
determines which regulator is on is selected, the SPI
interface determines which regulator is on or off. When
Seq 1: (1) VSH, (2) VSL, (3) VGH, (4) VGL is selected,
VSH, VSL, VGH, and VGL are powered in the sequence
Figure 2. MAX16927 EV Kit Software Interface Circuit Pop-Up Window
MAX16927 Evaluation Kit
Evaluates: MAX16927
8 ______________________________________________________________________________________
stated by the number inside their respective preceding
parentheses, and likewise for Seq 2 and Seq 3.
VCOMH, VCOML, DAC Direction, DAC Value
The EV kit software features a panel that contains
the VCOMH and VCOML status displays, the DAC
Direction radio group box, and the DAC Value edit
box. The VCOMH and VCOML status boxes display the
VCOMH and VCOML ON/Off states. The DAC Direction
radio group box selects the DAC’s Positive or Negative
direction. The DAC Value edit box accepts a hex
number between 00 and 7F to scale the VCOMH or
VCOML values. The VCOML values are scaled to
between 0 and +1V when the DAC Direction is Positive,
or between 0 and -1V when the DAC Direction is
Negative.
Over Temperature
The EV kit software features a panel that displays
the device’s overtemperature condition. The Over
Temperature panel displays On when the device’s
internal die temperature exceeds +165NC (typ).
Fault Condition
The EV kit software features a panel that displays the
device’s fault condition. The Fault Condition panel dis-
plays On when one or more of the device’s output volt-
ages (except for the buck-converter output) is less than
85% of their regulated values.
Reset
The Reset button resets the EV kit to the following
condition: +3.3V (EN3) = Disabled, Input Pwr (ENP)
= Disabled, Power Sequence (EN2, EN1) = Seq 0:
SPI determines which regulator is on, DAC Direction
= Positive, DAC Value = 00, VSH = Disabled, VSH
Current Limit = 100%, VSH Soft Start = checked, VSL
= Disabled, VSL Current Limit = 100%, VSL Soft Start
= checked, VSLS = Disabled, VGH = Disabled, VGH
Soft Start Time = 6.784 mSec, VGL = Disabled, and
VGL Soft Start Time = 6.784 mSec.
VSH Enabled/Disabled, Current Limit,
VSH Soft-Start, and VSH Status
The EV kit software features a panel that includes the
VSH Enabled/Disabled radio buttons, the Current Limit
drop-down list, the VSH Soft Start checkbox, and the
VSH Status display. The VSH Enabled/Disabled radio
buttons enable or disable the VSH regulator. Enable
the +3.3V (EN3) and Input Pwr (ENP) before enabling
VSH. The Current Limit drop-down list selects the VSH
current limit. The VSH Soft Start checkbox enables or
disables the VSH soft-start feature. VSH Status displays
the VSH On/Off status.
VSL Enabled/Disabled, Current Limit,
VSL Soft-Start, and VSL Status
The EV kit software features a panel that includes the
VSL Enabled/Disabled radio buttons, the Current Limit
drop-down list, the VSL Soft Start checkbox, and the
VSL Status display. The VSL Enabled/Disabled radio
buttons enable or disable the VSL regulator. Enable the
+3.3V (EN3) and Input Pwr (ENP) before enabling VSL.
The Current Limit drop-down list selects the VSL current
limit. The VSL Soft Start check box enables or disables
the VSL soft-start feature. VSL Status displays the VSL
On/Off status.
VSLS Enabled/Disabled and VSLS Status
The EV kit software features a panel that includes
the VSLS Enabled/Disabled radio buttons and the
VSLS Status display. The VSLS Enabled/Disable radio
buttons enable or disable the VSLS switch. Enable the
+3.3V (EN3), Input Pwr (ENP), and VSL before enabling
VSLS. VSLS Status displays the VSLS On/Off status.
VGH Enabled/Disabled, Soft-Start Time,
and VGH Status
The EV kit software features a panel that includes the
VGH Enabled/Disabled radio buttons, the Soft Start
Time drop-down list, and the VGH Status display. The
VGH Enabled/Disabled radio buttons enable or disable
the VGH regulator. Enable the +3.3V (EN3), Input Pwr
(ENP), VSH, and VSL before enabling VGH. The Soft
Start Time drop-down list selects the VGH soft-start
time. VGH Status displays the VGH On/Off status.
VGL Enabled/Disabled, Soft-Start Time,
and VGL Status
The EV kit software features a panel that includes the
VGL Enabled/Disabled radio buttons, the Soft Start
Time drop-down list, and the VGL Status display. The
VGL Enabled/Disabled radio buttons enable or disable
the VGL regulator. Enable the +3.3V (EN3), Input Pwr
(ENP), VSH, and VSL before enabling VGL. The Soft
Start Time drop-down list selects the VGL soft-start time.
VGL Status displays the VGL On/Off status.
Keyboard Navigation
Press the Tab key to select each GUI control. Most of the
selected control is indicated by a dotted outline. Using
Shift + Tab moves the selection to the previously select-
ed control. Buttons respond to the keyboard’s space bar.
Some controls respond to the keyboard’s up-and-down
arrow keys. Activate the program’s menu bar by press-
MAX16927 Evaluation Kit
Evaluates: MAX16927
_______________________________________________________________________________________ 9
ing the F10 key, then press the letter of the desired menu
item. When the Alt key is pressed and released, most
menu items show one letter underlined, indicating their
shortcut key.
General Troubleshooting
Problem: software reports it cannot find the interface
circuit.
• Is the interface circuit power LED lit?
• Is the USB cable connected?
• Has Windows plug-and-play detected the board?
Bring up Control Panel → System → Device
Manager, and look at what device nodes are
indicated for USB. If there is an “unknown device”
node attached to the USB, delete it; this forces plug-
and-play to try again.
• Are jumpers JU10–JU17 properly configured?
Detailed Description of Hardware
The MAX16927 EV kit contains a buck converter for
the VCC3 supply, boost converter for the VSH supply,
Cuk converter for the VSL supply, single-stage posi-
tive charge-pump for the positive gate-voltage linear-
regulator supply (VGH), single-stage negative charge
pump for the negative gate-voltage linear-regulator
controller supply (VGL), DAC-adjustable positive VCOM
buffer (VCOMH), and DAC-adjustable negative VCOM
buffer (VCOML).
Input Power Supply
The EV kit operates from +6V to +16V or +3V to +5.5V
DC supply voltage ranges. When operating the EV kit
from a +6V to +16V power supply, connect the power
supply between the IN3 and PGND3 PCB pads. When
operating the EV kit from a +3V to +5.5V power sup-
ply, connect the power supply between the VCC3 and
PGND3 PCB pads. Refer to the Detailed Description
section in the MAX16927 IC data sheet for additional
information. The EV kit’s default input range is configured
to +6V to +16V.
VCC3, PGOOD, and AVL (Buck Converter)
The VCC3 buck converter is configured for a +3.3V
output providing at least 2A. The VCC3 buck converter
switches at 2.1MHz in a default spread-spectrum mode.
The VCC3 buck-converter output is available between
the VCC3 and AGND3 PCB pads.
The EV kit provides a PGOOD PCB pad that indicates
the buck-converter output status. PGOOD is an active-
high output that pulls low when the buck output voltage
is below 90% of its nominal value and pulls high when
the output voltage is above 92% of its nominal value.
The EV kit provides an AVL PCB pad to verify the buck
converter’s 5V bias voltage.
VSH (Boost Converter)
The VSH boost converter is configured for a +7V output
providing at least 200mA. The VSH boost-converter
output voltage can be adjusted from INA to +18V by
replacing feedback resistors R11 and R12 (refer to the
Boost Converter section in the MAX16927 IC data sheet).
Operation at significantly higher output voltages can
reduce the available output current and require changes
in component values or component voltage rating.
VSL (Cuk Converter)
The VSL inverted switching regulator is configured for a
-7V output providing at least 100mA. The VSL inverted
switching-regulator output voltage can be adjusted from
-4V to -7V by replacing feedback resistors R2 and R3. If
the Cuk converter output is set more negative than -7V,
VSL must be disconnected from the VCOMN (refer to the
Cuk Converter section in the MAX16927 IC data sheet).
Operation at higher negative output voltages can reduce
the available output current.
VSLS (Sequenced VSL Output)
The VSLS output is a sequenced VSL. The VSLS output
is controlled by an external n-channel MOSFET (switch).
This switch is controlled by the SPI command avail-
able at the device’s VSLS pin. When the VSLS switch
is on, the VSLS PCB pad is connected to the VSL PCB
pad through the n-channel MOSFET, allowing VSLS to
share the voltage and current with the VSL output for
sequencing.
VGH, VCP (Positive Gate-Voltage
Linear Regulator/Charge Pump)
The VGH positive gate-voltage regulator is configured
for a +12V output providing at least 20mA. The VGH
positive gate-voltage regulator receives power from the
VCP. VCP is a single-stage, positive charge pump. The
VGH positive gate-voltage regulator’s output voltage can
be adjusted from +4.5V to +16V by replacing feedback
resistors R6 and R7 (refer to the Positive Gate-Voltage
Linear Regulator (VGH) section in the MAX16927 IC data
sheet).
MAX16927 Evaluation Kit
Evaluates: MAX16927
10 _____________________________________________________________________________________
VGL, VCN (Negative Gate-Voltage
Linear-Regulator Controller/Charge Pump)
The VGL negative gate-voltage regulator is configured
for a -12V output providing at least 20mA. The VGL
negative gate-voltage regulator receives power from the
VCN. VCN is a single-stage, negative charge pump. The
VGL negative gate-voltage regulator’s output voltage
can be adjusted from -4.5V to -16V by replacing feed-
back resistors R14 and R15 (refer to the Negative Gate-
Voltage Linear-Regulator Controller (VGL) section in the
MAX16927 IC data sheet). Note that a short circuit at
VGL can destroy the external npn transistor on the EV kit.
VCOMN, VCINL, VCOML
(Negative VCOM Buffer)
The EV kit provides the VCOMN, VCINL, and VCOML
PCB pads to access the negative VCOM buffer. The
VCOMN PCB pad accepts the power supply to the nega-
tive VCOM buffer. The VCINL PCB pad accepts an offset
voltage to the negative VCOM DAC output. The VCOML
is the negative VCOM buffer output. The negative VCOM
buffer output (VCOML) is DAC adjustable between -1V
and +1V and can source or sink 10mA.
The EV kit can only activate VCOML or VCOMH, but not
both. The EV kit is configured with the VCOML active and
VCOMH inactive by default. To activate VCOMH on the
EV kit, see the VCOMP, VCINH, and VCOMH (Positive
VCOM Buffer) section.
VCOMP, VCINH, VCOMH
(Positive VCOM Buffer)
The EV kit provides the VCOMP, VCINH, and VCOMH PCB
pads to access the positive VCOM buffer. The VCOMP
PCB pad accepts the power supply to the positive VCOM
buffer. The VCINH PCB pad accepts an offset voltage
to the positive VCOM DAC output. The VCOMH is the
positive VCOM buffer output. The positive VCOM buffer
output (VCOMH) is DAC adjustable between +2.5V and
+4.5V and can source or sink 100mA.
VCINH features an internal voltage-divider that sets
VCOMH to VCOMP/2 voltage. This voltage is DAC adjust-
able by Q1V (VSH/2 Q 1V). Also, the basic voltage
VCOMP/2 can be overwritten by driving VCINH (this range
is +2V to (VCOMP - 2V).
The EV kit can only activate VCOML or VCOMH, but not
both. The EV kit is configured with the VCOML active and
VCOMH inactive by default. To activate VCOMH on the EV
kit, follow the steps below:
1) Install a shunt on pins 2-3 of jumper JU4 (charge
pump’s source from LXP).
2) Install a shunt on pins 2-3 of jumper JU5 (VCN
discharge to GNDCP).
3) Install a shunt on pins 1-2 of jumper JU6 (VCOMH on,
VCOML off).
4) Replace resistor R14 with a lower value (R14 value
is application dependent; refer to the Negative Gate-
Voltage Linear-Regulator Controller (VGL) section in the
MAX16927 IC data sheet for additional information).
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 11
Table 2. JU1, JU10 Jumper Selection (ENP)
*Default position.
*Default position.
Table 3. JU2 Jumper Selection (FLT)
Table 4. JU4 and JU5 Jumper Selection (VCP, VCN)
*Default position.
Jumper Selection
Primary Enable (ENP)
Jumpers JU1 and JU10 enable or disable the device,
except for the buck converter. See Table 2 for shunt
positions.
Fault Output (FLT)
Jumper JU2 selects the destination for the fault output
signal from the FLT pin. See Table 3 for shunt positions.
Charge-Pump Input Source (LXN, LXP) and
VCN Discharging Level (VSL, GNDCP)
Jumper JU4 selects the charge-pump input source. This
input source determines the charge-pump output volt-
ages (VCP, VCN). In addition, jumper JU5 selects the
negative charge-pump VCN discharging level. This dis-
charging level further controls the VCN magnitude. See
Table 4 for shunt positions.
Note: If the CUK converter is not operated, JU4 must be
set to the 2-3 position; JU5 is not used.
SHUNT POSITION ENP PIN CONNECTED TO EV KIT OUTPUTS
(NOT INCLUDING THE BUCK CONVERTER)
JU1 JU10
Installed Not installed PGOOD
(U1, pin 14)
ENP follows status of buck PGOOD (i.e., if buck is running, it
activates the ENP automatically)
Not installed* 1-2* U107, pin 8 On-board SPI controlled
Not installed 1-3 INA
(through resistor R16) Enabled
Not installed 1-4 J1-8 External logic controlled
Not installed 1-5 AGND Disabled
Not installed Not installed Pulldown Disabled
SHUNT POSITION FLT PIN CONNECTED TO FLT PIN OUTPUTS SIGNALS TO
Installed* J1-6 and U108, pin 10 J1-6 and the on-board SPI interface circuit
(LED indication active)
Not installed J1-6 J1-6
SHUNT POSITION VCN DISCHARGES TO CHARGE-PUMP OUTPUT
VOLTAGES
JU4 JU5
1-2*
(C2 and C3 connected to LXN)
1-2* VSL VCP = +16.6V
VCN = -16.6V
2-3 GNDCP VCP = +16.6V
VCN = -9.8V
2-3
(C2 and C3 connected to LXP)
1-2 VSL VCP = +13.3V
VCN = -13.3V
2-3 GNDCP VCP = +13.3V
VCN = -6.5V
MAX16927 Evaluation Kit
Evaluates: MAX16927
12 _____________________________________________________________________________________
Table 8. JU9 Jumper Selection (SSEN)Table 6. JU7 Jumper Selection (VCOMN)
*Default position.
*Default position.
Cuk Converter Feedback (FBN)
The Cuk converter feedback FBN pin has two functions.
The FBN can be used to regulate the Cuk converter out-
put. It can be used to configure the boost convert for a
higher power output, and to select whether VCOMH or
VCOML is enabled. Refer to the MAX16927 IC data sheet
for more advanced features and operations. Jumper JU6
selects the device’s Cuk converter’s feedback input. See
Table 5 for shunt positions.
Negative VCOM Buffer Supply (VCOMN)
Jumper JU7 selects the device’s negative VCOM Buffer
supply. See Table 6 for shunt positions.
Buck-Converter Sync Input (SYNC)
Jumper JU8 selects the device’s buck-converter sync
input. See Table 7 for shunt positions.
Spread-Spectrum Enable (SSEN)
Jumper JU9 enables or disables the device’s spread-
spectrum mode for the boost and Cuk converters. See
Table 8 for shunt positions.
Table 7. JU8 Jumper Selection (SYNC)
*Default position.
Table 5. JU6 Jumper Selection (FBN)
*Default position.
SHUNT
POSITION
SYNC PIN
CONNECTED
TO
BUCK-CONVERTER
OPERATING MODE OR
SYNCHRONIZATION
1-2* AVL DCDC3 skip mode enabled
under light load
2-3 J1-12
DCDC3 synchronized to
externally provided clock
signal
SHUNT
POSITION
SSEN PIN
CONNECTED
TO
BOOST AND CUK
CONVERTERS SPREAD-
SPECTRUM MODE
1-2* INA Enabled
1-3 J1-7 External logic controlled
1-4 AGND Fixed 1.2MHz switching
frequency
Not installed Internal
pulldown
Fixed 1.2MHz switching
frequency
SHUNT
POSITION
VCOMN PIN
CONNECTED
TO
NEGATIVE VCOM
BUFFER
SUPPLIED BY
1-2* VSL VSL
2-3 VCGND Not powered
Not installed Not connected Not powered
SHUNT POSITION FBN PIN
CONNECTED TO CUK CONVERTER OUTPUT (VSL) REGULATED TO
1-2 INA
• Not regulated (Cuk converter off)
• Install a 0I resistor to R35 to configure the VSH output to +18V at 200mA
• VCOMH active and VCOML inactive
2-3*
VSL (through voltage
dividing-resistors R2
and R3)
• -7V (if the Cuk converter is set more negative than -7V, VSL must be
disconnected from the VCOMN)
• VCOML active and VCOMH inactive
Not installed Not connected Not regulated
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 13
Table 9. JU11, JU12 Jumper Selection
(EN1, EN2)
*Default position.
Table 13. JU16 Jumper Selection (DIN)
Table 14. JU17 Jumper Selection (DOUT)
*Default position.
*Default position.
Output Sequencing (EN1, EN2)
Jumpers JU11 and JU12 select the device’s output
sequencing for the VSH, VSL, VSLS, VGH, and VGL. See
Table 9 for shunt positions.
Buck-Converter Enable (EN3)
Jumper JU13 enables or disables the device’s buck con-
verter. See Table 10 for shunt positions.
SPI Chip Select (CS)
Jumper JU14 selects the device’s SPI chip-select con-
trolling source. See Table 11 for shunt positions.
SPI Clock (CLK)
Jumper JU15 selects the device’s SPI clock source. See
Table 12 for shunt positions.
SPI Data Input (DIN)
Jumper JU16 selects the device’s SPI data-input source.
See Table 13 for shunt positions.
SPI Data Output (DOUT)
Jumper JU17 selects the device’s SPI data-out destina-
tion. See Table 14 for shunt positions.
*Default position.
*Default position.
Table 11. JU14 Jumper Selection (CS)
Table 12. JU15 Jumper Selection (CLK)
*Default position.
Table 10. JU13 Jumper Selection (EN3)
SHUNT
POSITION VSH, VSL, VSLS, VGH, AND VGL
OUTPUT SEQUENCING
JU11
(EN1)
JU12
(EN2)
1-2* 1-2* On-board SPI controlled
1-4 1-4
External logic controlled;
Connect EN1 to J1-9;
Connect EN2 to J1-10
1-5 1-5 Seq 0: SPI determines which regulator
is on
1-3 Seq 1: (1) VSH, (2) VSL, (3) VGH, (4) VGL
1-3
1-5 Seq 2: (1) VSL, (2) VSH, (3) VGL, (4) VGH
1-3 Seq 3: (1) VSL, (2) VSH, (3) VGH,
(4) VGL, (5) VSLS
SHUNT
POSITION
DIN PIN
CONNECTED TO
SPI DATA INPUT
SUPPLIED BY
1-2 J1-3 External SPI controller
2-3* U101, pin 39 On-board SPI controller
Not
installed Not connected No data-input source
SHUNT
POSITION
DOUT PIN
CONNECTED TO
SPI DATA OUTPUT
SENT TO
1-2 J1-4 External SPI controller
2-3* U106, pin 10 On-board SPI controller
Not
installed Not connected No data-output
destination
SHUNT
POSITION
EN3 PIN
CONNECTED TO
BUCK-CONVERTER
OUTPUT
1-2* U101, pin 63 On-board SPI
controlled
1-3 IN3
(through resistor R8) Enabled
1-4 J1-11 External logic
controlled
1-5 AGND3 Disabled
Not
installed Not allowed Not allowed
SHUNT
POSITION
CS PIN
CONNECTED TO
SPI CHIP SELECT
CONTROLLED BY
1-2 J1-1 External SPI controller
2-3* U106, pin 8 On-board SPI controller
Not
installed Internal pullup No controlling source
SHUNT
POSITION
CLK PIN
CONNECTED TO
SPI CLOCK
SUPPLIED BY
1-2 J1-2 External SPI controller
2-3* U107, pin 7 On-board SPI controller
Not
installed Not connected No clock source
MAX16927 Evaluation Kit
Evaluates: MAX16927
14 _____________________________________________________________________________________
Figure 3a. MAX16927 EV Kit Schematic (Sheet 1 of 2)
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 15
Figure 3b. MAX16927 EV Kit Schematic (Sheet 2 of 2)
MAX16927 Evaluation Kit
Evaluates: MAX16927
16 _____________________________________________________________________________________
Figure 4. MAX16927 EV Kit Component Placement Guide—Component Side
1.0”
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 17
Figure 5. MAX16927 EV Kit PCB Layout—Component Side
1.0”
MAX16927 Evaluation Kit
Evaluates: MAX16927
18 _____________________________________________________________________________________
Figure 6. MAX16927 EV Kit PCB Layout—GND Layer 2
1.0”
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 19
Figure 7. MAX16927 EV Kit PCB Layout—PWR Layer 3
1.0”
MAX16927 Evaluation Kit
Evaluates: MAX16927
20 _____________________________________________________________________________________
Figure 8. MAX16927 EV Kit PCB Layout—Solder Side
1.0”
MAX16927 Evaluation Kit
Evaluates: MAX16927
______________________________________________________________________________________ 21
Figure 9. MAX16927 EV Kit Component Placement Guide—Solder Side
1.0”
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.
22 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX16927 Evaluation Kit
Evaluates: MAX16927
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/10 Initial release —
