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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 (V
IN
= 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 (V
IN
= 2.4V)
350mA at 5V, 600mA at 3.3V (V
IN
= 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
330µF, 10V tantalum capacitor
0.060Ω max ESR
Sprague 594D337X0010R2
100µF, 16V tantalum capacitor
0.1Ω max ESR
AVX TPSE107M016R0100
Open
10µF, 16V tantalum capacitor
220µF, 16V tantalum capacitor
0.060Ω max ESR
Sprague 594D227X0016R2
0.1µF ceramic capacitor
3A, 40V Schottky diode
Motorola MBRS340T3
3-pin headers
10µH, 2.5A inductor
Sumida CD75-10uH (2.3A, 0.07Ω)
Open
0.050Ω, 1% sense resistor
Dale WSL-2010-0.050Ω ±1% or
IRC LR2010-R050-F
165kΩ, 1% resistor
100kΩ, 1% resistors
Maxim MAX863EEE
Dual, logic-level N-channel FET
International Rectifier IRF7301
(V
T
< 0.70V, R
DS(ON)
= 0.070Ω at 2.7V)
PC board
______________Ordering Information
PART
MAX863EVKIT
TEMP. RANGE
0°C to +70°C
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 contact-
ing 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 out-
put 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 = 165kΩ and R6 = 100kΩ sets
OUT2 to 3.3V.
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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 for-
mulas:
R1 / R3 = (V
OUT1
/ V
REF
) - 1
R5 / R6 = (V
OUT2
/ V
REF
) - 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 = (V
LOW
/ V
REF
) - 1
where V
REF
= 1.25V.
Table 1. Jumper Settings
FUNCTION
JUMPER
STATE
1-2*
BOOT Pin
JU1
2-3
1-2*
V
DD
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
V
DD
= VIN; non-bootstrapped mode (V
IN
> 2.7V)
FB1 = GND; OUT1 set to 5V; R1 and R3 should be open.
FB1 = V
DD
; OUT1 set to 3.3V; R1 and R3 should be open.
OUT1 determined by R1 and R3
SHDN1
= V
DD
; OUT1 enabled
SHDN1
= GND; OUT1 disabled; OUT1 and OUT2 can be
independently disabled.
SHDN2
= V
DD
; OUT2 enabled
DESCRIPTION
BOOT = V
DD
; bootstrapped mode (V
IN
< 2.7V).
If BOOT is high, V
DD
must be connected to OUT1.
BOOT = GND; non-bootstrapped mode (V
IN
> 2.7V).
When using a non-bootstrapped circuit configuration,
connect BOOT to GND.
V
DD
= OUT1; bootstrapped mode (V
IN
< 2.7V)
OUT2
Shutdown
*
Indicates default factory settings.
2
_______________________________________________________________________________________
VIN
VIN
3
JU2
3
1
OUT1
LBO
V
DD
1
2
FB1
R3
OPEN
C8
0.1µF
3
3
SENSE1
VDD
15
14
13
12
11
10
9
C6
OPEN
C11
OPEN
R6
100k
1%
VIN
REF
16
C4
10µF
16V
C7
0.1µF
JU4 1
SHDN1 2
JU5 1
SHDN2 2
JU3
3
R8
100k
1%
BOOT
2
JU1
1
2
R7
OPEN
R9
OPEN
V
DD
GND
R1
Figure 1. MAX863 EV Kit Schematic Diagram
1
C10
OPEN
2
3
FB1
C3
OPEN
OPEN
U1
MAX863
FB2
SHDN1
CS2
EXT2
LBI
LBO
REF
SHDN2
VIN
FB1
4 BOOT
5
CS1
6
EXT1
7
GND
8
PGND
C9
100µF
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
10µH
2.5A
C2
100µF
16V
L2
10µH
2.5A
R5
165k
1%
OUT1
OUT2
Evaluates: MAX863
_______________________________________________________________________________________
C1
330µF
10V
R2
0.050Ω
R4
0.050Ω
C5
220µF
16V
GND
GND
GND
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
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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