General Description
The MAX8630X evaluation kit (EV kit) is a fully assem-
bled and tested circuit for evaluating the MAX8630X
charge-pump white LED driver. The MAX8630X EV kit
operates from a 2.7V to 5.5V supply. Two pulse genera-
tor circuits are included on the board for evaluating the
serial-pulse dimming feature. The EV kit can also be
used to evaluate the MAX8630W with PWM dimming.
Features
o93% Max/85% Avg Efficiency (PLED/PBATT) Over
Li+ Battery Discharge
oAdaptive 1x/1.5x Mode Switchover
o32-Step Serial-Pulse Dimming
oIndependent On/Off/Dimming for Main and Sub
Displays
o25mA per LED Output Current
oLow 0.1µA Shutdown Current
o2.7V to 5.5V Supply Voltage Range
oOn-Board Pulse Generators and White LEDs
o14-Pin, 3mm x 3mm TDFN IC Package
oLead-Free and RoHS Compliant
oFully Assembled and Tested
Evaluates: MAX8630X/MAX8630W
MAX8630X Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
19-4272; Rev 0; 9/08
Component List
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.
DESIGNATION QTY DESCRIPTION
C1–C4 4
1µF ±20%, 6.3V X5R ceramic
capacitors (0402)
Panasonic ECJ0EB0J105M
TDK C1005X5R0J105M
Murata GRM1555R60J105M
C5, C8 2
2.2µF ±10%, 6.3V X5R ceramic
capacitors (0603)
Panasonic ECJ1VB0J225K
TDK C1608X5R0J225K
Murata GRM188R60J225K
C6, C7 2
1000pF ±10%, X7R ceramic
capacitors (0402)
TDK C1005X7R1H102K
C9 0 N ot i nstal l ed , cer am i c cap aci tor ( 0402)
D1–D5 5 White LEDs
Nichia NSCW215T
DESIGNATION QTY DESCRIPTION
D6, D7 2 Diodes (SOD-323)
Central Semi CMDD4448
JU1, JU2 2 3-pin headers
JU3, JU4, JU5 0 PCB shorts
R1, R2 2 10kΩ ±5% resistors (0402)
S1, S2 2 Momentary pushbutton switches
Panasonic EVQ-PHP03T
U1 1
Charge pump (14 TDFN)
Maxim MAX8630XETD25
(Top Mark: ADX)
U2, U3 2 C M O S sw i tch d eb ouncer s ( 4 S OT143)
Maxim MAX6816EUS-T
— 2 Shunts, 2-position
— 1 PCB: MAX8630X Evaluation Kit+
Ordering Information
PART TYPE
MAX8630XEVKIT+ EV Kit
+
Denotes lead-free and RoHS compliant.
Component Suppliers
SUPPLIER PHONE WEBSITE
Central Semiconductor Corp. 631-435-1110 www.centralsemi.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Nichia Corp. 248-352-6575 www.nichia.com
Panasonic Corp. 800-344-2112 www.panasonic.com
TDK Corp. 847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX8630X or MAX8630W when contacting these component suppliers.
Evaluates: MAX8630X/MAX8630W
MAX8630X Evaluation Kit
2 _______________________________________________________________________________________
Table 1. Jumper Settings
JUMPER SHUNT
POSITION FUNCTION
1-2 ENM is pulled up to IN with a 10kΩ resistor, enabling the main LED group. The pulse
generator for the main LED group is powered.
JU1
2-3 ENM is pulled down to GND, disabling the main LED group. The pulse generator for the main
LED group is not powered.
1-2 ENS is pulled up to IN with a 10kΩ resistor, enabling the sub LED group. The pulse generator
for the sub LED group is powered.
JU2
2-3 ENS is pulled down to GND, disabling the sub LED group. The pulse generator for the sub
LED group is not powered.
Short Connects the on-board LEDs to the MAX8630 output.
JU3 Open Disconnects the on-board LEDs from the MAX8630 output.
Short Connects ENM to the on-board main pulse generator.
JU4 Open Disconnects ENM from the on-board main pulse generator.
Short Connects ENS to the on-board sub pulse generator.
JU5 Open Disconnects ENS from the on-board sub pulse generator.
Quick Start
Recommended Equipment
Before beginning, the follow equipment is needed:
• 2.7V to 5.5V power supply capable of delivering
500mA
Procedure
Follow the steps below to verify board operation:
1) Place shunts across pins 1-2 of JU1 and JU2 to
enable the main and sub LEDs.
2) Set the power-supply voltage between 2.7V to 5.5V.
Turn the power supply off. Do not turn on the power
supply until all connections are completed.
3) Connect the positive power-supply lead to the EV
kit pad labeled IN. Connect the power-supply
ground to the EV kit pad labeled GND.
4) Turn on the power supply. When turned on, the
LEDs are at full brightness.
5) To dim the main LEDs in 1/32nd steps, press S1
repeatedly. The main LEDs return to full brightness
after 32 button presses.
6) To dim the sub LEDs in 1/32nd steps, press S2
repeatedly. The sub LEDs return to full brightness
after 32 button presses.
Detailed Description of Hardware
Serial-Pulse Dimming
On-board pulse generators are provided to evaluate
the serial-pulse dimming feature of the MAX8630X. To
enable or disable the main or sub group of LEDs and
the corresponding pulse generator, use JU1 and JU2
(see Table 1). When first enabled, the LEDs are at full
brightness. To dim the main LEDs, press S1 repeated-
ly; for the sub LEDs, press S2 repeatedly. Dimming is
done in 32 linear steps. On the 32nd button press, the
LEDs return to full brightness.
To use external pulse generators, cut the traces short-
ing JU4 and JU5 to disconnect the on-board pulse
generators. Connect the external pulse generator to the
pads labeled ENM (main) and ENS/PWM (sub).
Using Fewer than 5 LEDs
To disable any of the LEDs, connect the square pad next
to that particular LED to the square pad labeled OUT.
Evaluating Other Versions of
the MAX8630
The MAX8630XETD25 (25mA serial-pulse dimming ver-
sion) comes installed on the MAX8630X EV kit. To eval-
uate other versions of the MAX8630X, simply replace
the IC with a part having the desired factory-pro-
grammed, full-scale output current.
To evaluate the MAX8630W_ with direct PWM dimming
control, replace U1 with the MAX8630W_, cut the
traces shorting JU4 and JU5, and install capacitor C9
(typically 0.1µF). Apply the PWM dimming signal to the
EV kit pad labeled ENS/PWM.
Evaluates: MAX8630X/MAX8630W
MAX8630X Evaluation Kit
_______________________________________________________________________________________ 3
IN
C1P C1N
C2P C2N
IN
IN
1
JU1 2
3
3OUT
D1
7
LED1 14
C3
1μF
C9
OPEN
C2
1μF
C1
1μF
GND
GND
3
D6
OUT
C6
1000pF
C5
2.2μFR1
10kΩ
VCC
GND
1
ENM
ENM 9
ENS
ENS/PWM 8
IN
JU4
2
1
4
4
1
IN
S1
MAX8630X
U1
MAX6816
U2
C4
1μF
JU3
OUT
D2
LED2 13
D3
LED3 12
D4
LED4 11
D5
LED5 10
45
26
1
JU2 2
3
3
D7
OUT
C7
1000pF
C8
2.2μFR2
10kΩ
VCC
GND
IN
JU5
2IN
S2
MAX6816
U3
Figure 1. MAX8630X EV Kit Schematic
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.
4
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Evaluates: MAX8630X/MAX8630W
MAX8630X Evaluation Kit
Figure 2. MAX8630X EV Kit Component Placement Guide—
Component Side
Figure 3. MAX8630X EV Kit PCB Layout—Component Side
Figure 4. MAX8630X EV Kit PCB Layout—Solder Side
