19-4272; Rev 0; 9/08
MAX8630X Evaluation Kit
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
o
93% Max/85% Avg Efficiency (P
LED
/P
BATT
) Over
Li+ Battery Discharge
o
Adaptive 1x/1.5x Mode Switchover
o
32-Step Serial-Pulse Dimming
o
Independent On/Off/Dimming for Main and Sub
Displays
o
o
o
o
o
25mA per LED Output Current
Low 0.1µA Shutdown Current
2.7V to 5.5V Supply Voltage Range
On-Board Pulse Generators and White LEDs
14-Pin, 3mm x 3mm TDFN IC Package
Evaluates: MAX8630X/MAX8630W
Ordering Information
PART
MAX8630XEVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS compliant.
o
Lead-Free and RoHS Compliant
o
Fully Assembled and Tested
Component List
DESIGNATION
QTY
DESCRIPTION
1µF ±20%, 6.3V X5R ceramic
capacitors (0402)
Panasonic ECJ0EB0J105M
TDK C1005X5R0J105M
Murata GRM1555R60J105M
2.2µF ±10%, 6.3V X5R ceramic
capacitors (0603)
Panasonic ECJ1VB0J225K
TDK C1608X5R0J225K
Murata GRM188R60J225K
1000pF ±10%, X7R ceramic
capacitors (0402)
TDK C1005X7R1H102K
Not installed, ceramic capacitor (0402)
White LEDs
Nichia NSCW215T
DESIGNATION
D6, D7
JU1, JU2
JU3, JU4, JU5
R1, R2
S1, S2
QTY
2
2
0
2
2
DESCRIPTION
Diodes (SOD-323)
Central Semi CMDD4448
3-pin headers
PCB shorts
10kΩ ±5% resistors (0402)
Momentary pushbutton switches
Panasonic EVQ-PHP03T
Charge pump (14 TDFN)
Maxim MAX8630XETD25
(Top Mark: ADX)
CMOS switch debouncers (4 SOT143)
Maxim MAX6816EUS-T
Shunts, 2-position
PCB: MAX8630X Evaluation Kit+
C1–C4
4
C5, C8
2
U1
1
C6, C7
C9
D1–D5
2
0
5
U2, U3
—
—
2
2
1
Component Suppliers
SUPPLIER
Central Semiconductor Corp.
Murata Electronics North America, Inc.
Nichia Corp.
Panasonic Corp.
TDK Corp.
PHONE
631-435-1110
770-436-1300
248-352-6575
800-344-2112
847-803-6100
WEBSITE
www.centralsemi.com
www.murata-northamerica.com
www.nichia.com
www.panasonic.com
www.component.tdk.com
Note:
Indicate that you are using the MAX8630X or MAX8630W when contacting these component suppliers.
________________________________________________________________
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.
MAX8630X Evaluation Kit
Evaluates: MAX8630X/MAX8630W
Quick Start
Recommended Equipment
Before beginning, the follow equipment is needed:
• 2.7V to 5.5V power supply capable of delivering
500mA
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).
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.
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.
FUNCTION
Table 1. Jumper Settings
JUMPER
SHUNT
POSITION
1-2
JU1
2-3
1-2
JU2
2-3
JU3
JU4
JU5
Short
Open
Short
Open
Short
Open
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.
ENM is pulled down to GND, disabling the main LED group. The pulse generator for the main
LED group is not powered.
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.
ENS is pulled down to GND, disabling the sub LED group. The pulse generator for the sub
LED group is not powered.
Connects the on-board LEDs to the MAX8630 output.
Disconnects the on-board LEDs from the MAX8630 output.
Connects ENM to the on-board main pulse generator.
Disconnects ENM from the on-board main pulse generator.
Connects ENS to the on-board sub pulse generator.
Disconnects ENS from the on-board sub pulse generator.
2
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