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MAX1625 Evaluation Kit
_______________General Description
The MAX1625 evaluation kit (EV kit) provides a 2.5V
output voltage from a 4.5V to 5.5V input. It delivers up
to 5A output current with greater than 90% efficiency.
The MAX1625 features a resistor-programmable switch-
ing frequency from 100kHz to 1MHz, as well as current-
mode operation for superior load- and line-transient
response. This EV kit operates at a 500kHz switching
frequency. It can also be used to evaluate other output
voltages by changing feedback resistors R2 and R3.
____________________________Features
o
4.5V to 5.5V Input Voltage Range
o
2.5V Output Voltage (1.1V to 4.0V adjustable)
o
5A Output Current
o
Efficiency = 91%, V
IN
= 5V,
V
OUT
= 2.5V @ I
OUT
= 2.5A
o
Power-OK Output
o
500kHz Switching Frequency
o
16-Pin Narrow SO
o
Low-Profile Components
o
Fully Assembled and Tested
Evaluates: MAX1625
______________Ordering Information
PART
MAX1625EVKIT
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
_____________________________________________________________Component List
DESIGNATION QTY
C1
C2, C3
C4, C5, C9
C6
C7, C8
C10
C11, C12
CC1
CC2
D1
(optional)
D2
1
2
3
1
2
0
2
1
1
1
DESCRIPTION
100µF, 10V electrolytic capacitor
Sanyo 10SL100M
220µF, 4V electrolytic capacitors
Sanyo 4SP220M
0.1µF ceramic capacitors
2.2µF ceramic capacitor
4.7µF, 16V tantalum capacitors
Sprague 595D475X0016A2T
Open
4700pF ceramic capacitors
1000pF ceramic capacitor
0.056µF ceramic capacitor
Schottky diode
Nihon NSQ03A02 or
Motorola MBRS340T3
Schottky diode
Central Semiconductor CMPSH-3
1.5µH power inductor
Coiltronix UP2-1R5,
Coilcraft DO3316P-152, or
Sumida CDRH127-1R3
R2
R3
R4
R5
R6
R7, R8
R9
U1
JU1
None
None
None
1
1
1
1
1
2
1
1
1
1
1
1
127kΩ, 1% resistor
100kΩ, 1% resistor
40.2kΩ, 1% resistor
100kΩ, 5% resistor
100Ω, 5% resistor
39Ω, 5% resistors
1kΩ, 5% resistor
MAX1625ESE
2-pin header
Shunt
MAX1625 PC board
MAX1625 data sheet
R1
1
DESIGNATION QTY
N1, N2
2
DESCRIPTION
N-channel MOSFETs (SO-8)
International Rectifier IRF7413 or
Siliconix Si4410DY
0.012Ω, 1%, 1W resistor
Dale WSL-2512-R012-F or
IRC LR2512-01-R012-F
1
L1
1
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX1625 Evaluation Kit
Evaluates: MAX1625
______________Component Suppliers
SUPPLIER*
AVX
Central
Semiconductor
Coilcraft
Dale-Vishay
International Rectifier
IRC
Motorola
Nihon
Sanyo
Siliconix
Sprague
Sumida
Vishay/Vitramon
PHONE
(803) 946-0690
(516) 435-1110
(708) 639-6400
(402) 564-3131
(310) 322-3331
(512) 992-7900
(602) 303-5454
(805) 867-2555
(619) 661-6835
(408) 988-8000
(603) 224-1961
(847) 956-0666
(203) 268-6261
FAX
(803) 626-3123
(516) 435-1824
(708) 639-1469
(402) 563-6418
(310) 322-3332
(512) 992-3377
(602) 994-6430
(805) 867-2698
(619) 661-1055
(408) 970-3950
(603) 224-1430
(847) 956-0702
(203) 452-5670
_______________Detailed Description
The MAX1625 provides a 2.5V output from 4.5V to 5.5V
input voltage. It delivers up to 5A and operates at
500kHz. Other output voltages can be programmed by
changing the feedback resistor R2. R2 is given by:
V
R2 = R3
OUT
−
1
1.1
where R3 = 100kΩ.
Jumper Selection
The 2-pin header JU1 selects the shutdown mode.
Table 1 lists the selectable jumper options.
Table 1. Jumper JU1 Functions
SHUNT
LOCATION
On
Off
REF PIN
Connected to GND
Floating
MAX1625
OUTPUT
Shutdown mode,
V
OUT
= 0V
MAX1625 enabled,
V
OUT
= 2.5V
*
Please indicate that you are using the MAX1625 when
contacting these component suppliers.
_________________________Quick Start
The MAX1625 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. The
ground connects 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.
2
_______________________________________________________________________________________
VIN
4.5V TO 5.5V
1
2
L
R
D2
CMPSH-3
C11
4700pF
3
R7
39Ω
C1
100µF
10V
R6
100Ω
Figure 1. MAX1625 EV Kit Schematic
C9
0.1µF
C12
4700pF
C7
4.7µF
16V
5
V
CC
V
DD
CSH
4
3
16
N1
1
C4
0.1µF
L1
1.5µH
N2
C10
OPEN
D1
NSQ03A02
(OPTIONAL)
R2
127k
1%
C2
220µF
4V
C3
220µF
4V
VOUT
2.5V, 5A
R8
39Ω
R1
0.012Ω
12
C5
0.1µF
CSL
DH
REF
BST
C8
4.7µF
16V
U1
MAX1625
ON/OFF
6
C6
2.2µF
R5
100k
LX
2
PWROK
DL
9
CC1
PGND
CC2
FREQ
AGND
7
FB
8
14
10
11
13
R11
1k
15
JU1
VIN
PWROK
CC1
1000pF
CC2
0.056µF
Evaluates: MAX1625
_______________________________________________________________________________________
R3
100k
1%
R4
40.2k
1%
MAX1625 Evaluation Kit
3
MAX1625 Evaluation Kit
Evaluates: MAX1625
1.0"
1.0"
Figure 2. MAX1625 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1625 EV Kit PC Board Layout—Component Side
1.0"
1.0"
Figure 4. MAX1625 EV Kit PC Board Layout—Two Internal
Ground Planes
Figure 5. MAX1625 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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