MAX1639 Evaluation Kit
________________General Description
The MAX1639 evaluation kit (EV kit) provides a 2.5V out-
put voltage from a +4.5V to +5.5V input supply. It deliv-
ers up to 8A output current with greater than 90% effi-
ciency. Features include pin-selectable switching fre-
quencies of 300kHz, 600kHz, and 1MHz, as well as cur-
rent-mode operation for superior load- and line-transient
response. This EV kit operates at 600kHz switching fre-
quency. It can also be used to evaluate other output volt-
ages by changing the feedback resistors R2 and R3.
This EV kit is fully assembled and tested, and is offered
in a 16-pin narrow SO package.
____________________________Features
o
+4.5V to +5.5V Input Voltage Range
o
2.5V Output Voltage (1.1V to 4.0V adjustable)
o
8A Output Current
o
Power-Good Output
o
600kHz Switching Frequency
o
16-Pin Narrow SO Package
o
Fully Assembled and Tested
Evaluates: MAX1639
_______________Ordering Information
PART
MAX1639EVKIT
TEMP. RANGE
0擄C to +70擄C
PIN-PACKAGE
16 Narrow SO
____________________Component List
DESIGNATION QTY
C1
C2, C3
C4, C5, C9
CC1
CC2
C6
C7
C8
C10, D1
D2
L1
N1, N2
R1
R2
R3
R4
R5
R6
U1
JU1
None
None
None
1
2
3
1
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
DESCRIPTION
330碌F, 6.3V, low-ESR capacitor
Sanyo 6SA330M
560碌F, 4V, low-ESR capacitors
Sanyo 4SP560M
0.1碌F ceramic capacitors
1000pF ceramic capacitor
0.056碌F ceramic capacitor
2.2碌F, 10V ceramic capacitor
TDK C3216X7R1C225M or
Taiyo Yuden EMK316BJ225ML
10碌F, 10V tantalum capacitor
Sprague 595D106X0010A2T
4.7碌F, 16V tantalum capacitor
Sprague 595D475X0016A2T
Not installed
Schottky diode
Central Semiconductor CMPSH-3
1.0碌H power inductor
Coiltronics UP2B-1R0 or
Coilcraft DO3316P-102HC
N-channel MOSFETs (SO-8)
Fairchild FDS6680
0.009鈩? 1%, 1W resistor
Dale WSL-2512-R009-F or
IRC LR2512-01-R009-F
12.7k鈩? 1% resistor
10k鈩? 1% resistor
10鈩? 5% resistor
100k鈩? 5% resistor
1k鈩? 5% resistor
MAX1639ESE
2-pin header
Shunt
MAX1639 PC board
MAX1639 data sheet
_________________________Quick Start
The MAX1639 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) Connect a +5V supply voltage to the VIN pad.
Connect ground to the GND pad.
2) Connect a voltmeter and load, if any, to the VOUT
pad.
3) Remove the shunt from JU1.
4) Turn on the power supply to the board. Verify that
the output voltage is 2.5V.
_______________Detailed Description
The MAX1639 provides a 2.5V output from 4.5V to 5.5V
input voltage. It delivers up to 8A and operates at
600kHz. Other output voltages can be programmed by
changing the feedback resistor R2. R2 is given by:
錚?/div>
V
錚?/div>
R2 = R3
錚?/div>
OUT
鈭?/div>
1
錚?/div>
錚?/div>
1.1
錚?/div>
where R3 =10k鈩?
For output voltages greater than 3.3V, use appropriate-
ly rated output capacitors (C2, C3).
Jumper Selection
The 2-pin header JU1 selects the shutdown mode.
Table 1 lists the selectable jumper options.
The 4-pin header JU2 selects the switching frequency.
Table 2 lists the selectable jumper options. The EV kit鈥檚
components are selected for 600kHz operation. If 300kHz
or 1MHz operation is selected, component values need to
be changed and the PC board trace between pins 1 and
2 of JU2 must be cut (refer to the
Design Procedure
section in the MAX1639 data sheet).
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
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