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19-2774; Rev 0; 2/03
MAX1910 Evaluation Kit
General Description
The MAX1910 evaluation (EV) kit is a fully assembled and tested circuit board containing a complete circuit driving four parallel white LEDs. The circuit operates from a 2.7V to 5.3V input supply. A MAX1910 comes installed on the board, but the EV kit can also be used to evaluate the MAX1912. o Current-Regulated Charge Pump o 60mA Output Current o No Inductor Required o 750kHz Operation Minimizes Input Ripple o Uses Small Ceramic Capacitors o Load Disconnected in Shutdown o 1A Shutdown Current o Small 10-Pin MAX Package o Fully Assembled and Tested
Features
Evaluates: MAX1910/MAX1912
Component List
DESIGNATION QTY C1, C2 2 DESCRIPTION 0.47F 10%, 10V X5R ceramic capacitors (0603) Taiyo Yuden LMK107BJ474KA 2.2F 10%, 10V X5R ceramic capacitors (0805) Taiyo Yuden LMK212BJ225KG 15 5% resistors (0805) Not installed (0805) PC board shorts Not installed (0805) 1 5% resistor (0805) 100k 5% resistor (0805) White LEDs (surface mount 3mm x 2mm) Kingbright AA3020PWC, Nichia: NSCW455, or Nichia: NSCW215T 3-pin header MAX1910EUB (10-pin MAX) Shunt MAX1910 EV kit PC board
C3, C4 R1-R4 R5, R7 R6 R11 R13
2 4 0 0 1 1
Ordering Information
PART MAX1910EVKIT TEMP RANGE -40C to +85C IC PACKAGE 10 MAX
Quick Start
The MAX1910 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed: 1) Preset the power supply to between 2.7V and 4.2V. 2) Verify shunt JU1 is on pins 1 and 2 (enable). 3) Connect the positive (+) lead of the power supply to the IN1 pad. 4) Connect the negative (-) lead of the power supply to the GND pad.
D1-D4
4
JU1 U1 None None
1 1 1 1
Component Suppliers
SUPPLIER Kamaya Kingbright Nichia Taiyo Yuden PHONE 260-489-1533 888-546-4533 248-352-6575 408-573-4150 WEBSITE www.kamaya.com www.kingbright.com www.nichia.com www.t-yuden.com
5) Turn on the power supply. 6) Verify that the LEDs are lit. 7) Vary the power supply from 2.7V to 4.2V. 8) To verify shutdown mode, move shunt JU1 to pins 2 and 3. The LEDs turn off. 9) Move shunt JU1 back to pins 1 and 2. The LEDs turn back on.
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1910 Evaluation Kit Evaluates: MAX1910/MAX1912
Detailed Description
Jumper Selection
Shutdown Mode The MAX1910 features a shutdown mode that reduces input current to 0.1A (typ). Place the shunt across pins 1 and 2 of JU1 for normal operation. Place the shunt across pins 2 and 3 of JU1 for shutdown mode (Table 1). 1) Cut the PC board traces that short the pads for R5 and R7. 2) Short the pads of R6. 3) R5 remains open. 4) Install a resistor in R7. R7 sets the sum of all LED currents, and its value is found from: R7 = 0.2 IL
Table 1. Jumper JU1 Functions
SHUNT LOCATION 1 and 2 2 and 3 SHDN PIN Connected to IN Connected to GND OUTPUT Enabled Shutdown
Connecting an External Load
To use an external load in place of the four LEDs (such as an LED module), first follow the steps listed in the Regulating the Total Current Through LEDs section. Next, remove the four LEDs (D1-D4), or the four ballast resistors (R1-R4). An external load can now be connected from OUT1+ to OUT1-. The current through the external load is regulated to the current set by R7.
Regulating the Total Current Through LEDs
In the default configuration, the current through LED D4 is set by the resistor R4. The current through the other LEDs tracks the current in the regulated LED. Refer to the MAX1910/MAX1912 data sheet for other LED matching and ballasting configurations. The EV kit can also be configured to regulate the total current through the LEDs by following these steps:
Evaluating the MAX1912
To evaluate the MAX1912, carefully remove U1 from the PC board and replace it with the MAX1912. Free samples of the MAX1912 can be obtained from Maxim.
1 JU1 2 3 IN R11 1 C3 2.2F GND 8 2 4 C1 0.47F 9 7 C2 0.47F 3 IN1 IN2 C1+ C1C2+ SET C2GND 1 10 U1 MAX1910 6 SHDN OUT 5
R13 100k
OUT1+ R5 SHORT
D4
D3
D2
D1
C4 2.2F
R6 OPEN
R4 15
R3 15
R2 15
R1 15
OUT1-
R7 SHORT
Figure 1. MAX1910 EV Kit Schematic
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MAX1910 Evaluation Kit Evaluates: MAX1910/MAX1912
Figure 2. MAX1910 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1910 EV Kit PC Board Layout--Component Side
Figure 4. MAX1910 EV Kit PC Board 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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