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19-1218; Rev 2; 2/98
MAX863 Evaluation Kit
_______________General Description
The MAX863 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX863 dual, step-up DC-DC controller. The EV kit is factory preset to provide 5V and 3.3V outputs at 700mA and 1.1A, respectively (VIN = 2.4V). Both outputs can also be set to other voltages by pin-strapping or with external resistors.
____________________________Features
o Output Voltages: Preset 5V and 3.3V, or User-Defined o Output Currents: 700mA at 5V, 1.1A at 3.3V (VIN = 2.4V) 350mA at 5V, 600mA at 3.3V (VIN = 1.5V) o Low-Battery Detector o Fully Assembled and Tested o Proven PC Board Layout
Evaluates: MAX863
____________________Component List
DESIGNATION QTY C1 1 DESCRIPTION 330F, 10V tantalum capacitor 0.060 max ESR Sprague 594D337X0010R2 100F, 16V tantalum capacitor 0.1 max ESR AVX TPSE107M016R0100 Open 10F, 16V tantalum capacitor 220F, 16V tantalum capacitor 0.060 max ESR Sprague 594D227X0016R2 0.1F ceramic capacitor 3A, 40V Schottky diode Motorola MBRS340T3 3-pin headers 10H, 2.5A inductor Sumida CD75-10uH (2.3A, 0.07) Open 0.050, 1% sense resistor Dale WSL-2010-0.050 1% or IRC LR2010-R050-F 165k, 1% resistor 100k, 1% resistors Maxim MAX863EEE Dual, logic-level N-channel FET International Rectifier IRF7301 (VT < 0.70V, RDS(ON) = 0.070 at 2.7V) PC board
______________Ordering Information
PART MAX863EVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
C2, C9 C3, C6, C10, C11 C4 C5 C7, C8 D1, D2 JU1-JU5 L1, L2 R1, R3, R7, R9 R2, R4 R5 R6, R8 U1 U2 None
2 0 1 1 1 2 5 2 0 2 1 2 1 1 1
______________Component Suppliers
SUPPLIER* AVX Dale International Rectifier IRC Motorola Sprague Sumida USA Japan PHONE (803) 946-0690 (800) 282-4975 (605) 668-4131 (310) 322-3331 (512) 992-7900 (602) 303-5454 (603) 224-1961 (847) 956-0666 81-3-3607-5111 FAX (803) 626-3123 (605) 665-1627 (310) 322-3332 (512) 992-3377 (602) 994-6430 (603) 224-1430 (847) 956-0702 81-3-3607-5144
*Please indicate that you are using the MAX863 when contacting these suppliers.
_________________________Quick Start
This section describes how to operate the MAX863 EV kit and evaluate its performance. Do not turn on the power supply until all connections are completed. 1) Configure the jumpers in accordance with Table 1. 2) Connect a 1.5V to 3.3V DC power supply between the VIN and GND input pads. 3) Turn on the power supply. With no load and the output in regulation, supply current for the board should be less than a few hundred microamperes. 4) Measure the output voltage at OUT1. With FB1 = GND (JU3 = 1-2), OUT1 will be preset to 5V. 5) Measure the output voltage at OUT2. The standard factory setting of R5 = 165k and R6 = 100k sets OUT2 to 3.3V.
1
________________________________________________________________ Maxim Integrated Products
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.
MAX863 Evaluation Kit Evaluates: MAX863
_Detailed Description of Hardware
Adjustable Output Voltage
OUT2 must be set with a resistor divider. The EV kit board provides R5 and R6 for this purpose. OUT1 can be set with a resistor divider (R1 and R3) or configured for a preset value (JU3). The EV kit board is preset for a 5.0V output. To configure OUT1 for an adjustable output, open jumper JU3 and then install resistors at sites R1 and R3. Select the resistors according to the following formulas: R1 / R3 = (VOUT1 / VREF) - 1 R5 / R6 = (VOUT2 / VREF) - 1 where VREF = 1.25V. Note: Output capacitors C1 and C5 are rated for 10V and 16V, respectively. For higher output voltages, replace these capacitors. The EV kit board provides space at C3, C6, C10, and C11 for optional compensation capacitors. Refer to the Set Feedback Compensation section in the MAX863 data sheet for more information.
Low-Battery Detector
The EV kit board provides pads at R7 and R8 for an optional resistor divider for the low-battery voltage detector. When the voltage at the LBI pin falls below 1.25V, the LBO pin is pulled low. Select the resistors according to the following formula: R7 / R8 = (VLOW / VREF) - 1 where VREF = 1.25V.
Table 1. Jumper Settings
FUNCTION JUMPER STATE 1-2* BOOT Pin JU1 2-3 1-2* VDD Select JU2 2-3 1-2* OUT1 Set JU3 2-3 Open 1-2* OUT1 Shutdown JU4 2-3 1-2* JU5 2-3 SHDN2 = GND; OUT2 disabled VDD = VIN; non-bootstrapped mode (VIN > 2.7V) FB1 = GND; OUT1 set to 5V; R1 and R3 should be open. FB1 = VDD; OUT1 set to 3.3V; R1 and R3 should be open. OUT1 determined by R1 and R3 SHDN1 = VDD; OUT1 enabled SHDN1 = GND; OUT1 disabled; OUT1 and OUT2 can be independently disabled. SHDN2 = VDD; OUT2 enabled DESCRIPTION BOOT = VDD; bootstrapped mode (VIN < 2.7V). If BOOT is high, VDD must be connected to OUT1. BOOT = GND; non-bootstrapped mode (VIN > 2.7V). When using a non-bootstrapped circuit configuration, connect BOOT to GND. VDD = OUT1; bootstrapped mode (VIN < 2.7V)
OUT2 Shutdown
* Indicates default factory settings.
2
_______________________________________________________________________________________
VIN VIN 3 2 3 1 1 BOOT LBO V DD 1 2 FB1 R3 OPEN C8 0.1F 3 3 SENSE1 VDD 15 14 13 12 11 10 9 C6 OPEN C11 OPEN R6 100k 1% VIN REF 16 C4 10F 16V C7 0.1F JU4 1 SHDN1 2 JU5 1 SHDN2 2 JU3 3 R8 100k 1% 2 JU1 R7 OPEN R9 OPEN V DD
GND
JU2
OUT1
R1
Figure 1. MAX863 EV Kit Schematic Diagram
1 C10 OPEN 2 3
OPEN
FB1 C3 OPEN
U1 MAX863
FB2 SHDN1 CS2 EXT2 LBI LBO
REF SHDN2
VIN
FB1 4 BOOT 5 CS1 6 EXT1 7 GND 8 PGND C9 100F 16V TEST POINTS J2-1 VDD REF SHDN2 LBO SHDN1 GND 2 1 8 7 U2A D2 IRF7301 MBRS340T3 J2-2 J2-3 D1 MBRS340T3 J2-4 5 6 J2-5 4 J2-6 U2B IRF7301 3 L1 10H 2.5A C2 100F 16V L2 10H 2.5A
R5 165k 1%
OUT1
OUT2
Evaluates: MAX863
_______________________________________________________________________________________
R2 0.050 R4 0.050 C5 220F 16V GND GND
GND
C1 330F 10V
MAX863 Evaluation Kit
3
MAX863 Evaluation Kit Evaluates: MAX863
1.0"
1.0"
Figure 2. MAX863 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX863 EV Kit Component Placement Guide-- Solder Side
1.0"
1.0"
Figure 4. MAX863 EV Kit PC Board Layout--Component Side
Figure 5. MAX863 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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