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MAX1638VRM Evaluation Kit
_______________General Description
The MAX1638VRM evaluation kit (EV kit) provides a digi-
tally programmable output voltage between 1.3V and
3.5V from a 5V input supply. It delivers up to 14A output
current with greater than 90% efficiency. The MAX1638
features 1% output accuracy as well as 1% AC-load reg-
ulation. The EV kit operates at a 600kHz switching fre-
quency and has excellent dynamic response to correct
for fast output transients.
A separate test-fixture PC board emulates a system
motherboard and contains a 22µF ceramic capacitor
that models the local CPU bypass capacitors. The test
fixture also puts the GlitchCatcher MOSFETs on the cor-
rect side of the VRM connector, in order to reduce stray
inductance.
____________________________Features
4.5V to 5.5V Input Voltage Range
1.3V to 3.5V Output Voltage Range
14A Output Current Capability
1% AC-Load Regulation
Power-Good Output
600kHz Switching Frequency
GlitchCatcher
®
Provides Excellent Load-
Transient Response (MAX1638VRM test fixture)
o
24-Pin SSOP Package
o
Fully Assembled and Tested
o
o
o
o
o
o
o
Evaluates: MAX1638
MAX1638VRM EV Board
_____________________Component List
DESIGNATION QTY
C1, C2, C3
3
4
3
1
1
1
1
1
1
1
DESCRIPTION
220µF, 10V, low-ESR capacitors
Sanyo 10SA220M
220µF, 4V, low-ESR capacitors
Sanyo 4SP220M
0.1µF ceramic capacitors
10µF, 10V tantalum capacitor
Sprague 595D106X0010A
4.7µF, 16V tantalum capacitor
Sprague 595D475X0016A2T
2.2µF, 10V ceramic capacitor
TDK C3216X7R1C225M or
Taiyo Yuden EMK316BJ225ML
1000pF ceramic capacitor
0.056µF ceramic capacitor
Schottky diode
Central Semiconductor CMPSH-3
0.47µH power inductor
Coiltronics UP4-R47 (0.47µH) or
Panasonic ETQP1F0R7H (0.7µH)
N-channel MOSFET (D2PAK)
Fairchild FDB7030L or
International Rectifier IRL3803S
0.009Ω, 1%, 1W resistors
Dale WSL-2512-R009-F
100Ω, 5% resistor
10Ω, 5% resistor
1kΩ, 5% resistor
100kΩ, 5% resistor
MAX1638EAG (SSOP-24)
40-pin power connector
AMP 532956-7
MAX1638VRM PC board
1
_______________Ordering Information
PART
MAX1638VRMEVKIT
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
C5–C8
C9, C10, C14
C11
MAX1638VRM Test-Fixture
_____________________Component List
DESIGNATION QTY
C1
C2
U1
1
1
1
DESCRIPTION
22µF, 10V ceramic capacitor
TDK C4532X5RA226M or
Taiyo Yuden LMK432BJ226K
1µF ceramic capacitor
N- and P-channel MOSFET (SO-8)
International Rectifier IRF7105
0.5Ω, 5%, 1/2W resistor (not installed)
Dale WSL-2010-R5-J or
IRC LR2010-01-R5-J
5-position dip switch
40-pin male power connector
AMP 146315-1
MAX1638VRM test-fixture PC board
C12
C13
CC1
CC2
D1
L1
R1
SW1
P1
None
0
1
1
1
N1, N2
R1, R2
R3
R4
R5
R6
U1
J1
None
2
2
1
1
1
1
1
1
1
GlitchCatcher is a registered trademark of Maxim Integrated
Products.
________________________________________________________________
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.
MAX1638VRM Evaluation Kit
Evaluates: MAX1638
______________Component Suppliers
SUPPLIER
AVX
Central
Semiconductor
Coilcraft
Coiltronics
Dale-Vishay
Fairchild
International
Rectifier
IRC
Kemet
Panasonic
Sanyo
Sprague
Sumida
Taiyo Yuden
TDK
Vishay/Vitramon
PHONE
(803) 946-0690
(516) 435-1110
(847) 639-6400
(561) 241-7876
(402) 564-3131
(408) 721-2181
(310) 322-3331
(512) 992-7900
(864) 963-6300
(201) 392-7522
(619) 661-6835
(603) 224-1961
(847) 956-0666
(408) 573-4150
(847) 390-4373
(203) 268-6261
FAX
(803) 626-3123
(516) 435-1824
(847) 639-1469
(561) 241-9339
(402) 563-6418
(408) 721-1635
(310) 322-3332
(512) 992-3377
(864) 963-6521
(201) 392-4441
(619) 661-1055
(603) 224-1430
(847) 956-0702
(408) 573-4159
(847) 390-4428
(203) 452-5670
SHUNT
LOCATION
2&3
Not installed
1&2
LG PIN
Connected to GND
Floating
Connected to V
CC
AC LOOP
REGULATION
(%)
0.5
1
2
0
1
1
—
1
1
1
0
0
—
1
1
1
0
0
—
1
1
1
0
0
—
1
1
1
0
1
—
0
1
Table 1. MAX1638 Output Voltage
Adjustment Settings (abbreviated)
D4
0
0
—
D3
0
0
—
D2
0
0
—
D1
0
0
—
D0
0
1
—
OUTPUT VOLTAGE (V)
2.050
2.000
Decreases in 50mV
increments
1.3
3.5
3.4
Decreases in 100mV
increments
2.1
Off
Table 2. Jumper JU1 Functions
Note:
Please indicate that you are using the MAX1638 when con-
tacting these component suppliers.
_________________________Quick Start
The MAX1638VRM 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 located on the
MAX1638VRM test board.
2) Connect a voltmeter and load, if any, to the VOUT
pad.
3) Turn on the power supply to the board.
4) Set switch SW1 per Table 1 to get the desired out-
put voltage.
Table 3. Jumper JU2 Functions
SHUNT
LOCATION
1&4
1&2
1&3
FREQ PIN
Connected to GND
Connected to REF
Connected to V
CC
SWITCHING
FREQUENCY
(kHz)
300
600
1000
_______________Detailed Description
Jumper Selection
The 3-pin jumper JU1 selects the AC loop gain. Table 2
lists the selectable jumper options. JU1 allows the user
to trade off gain response to AC-load regulation and
transient response. AC-load regulation can be set to
0.5%, 1%, and 2%. The default value is 1%.
The 4-pin jumper JU2 selects the switching frequency.
Table 3 lists the selectable jumper options. The EV kit’s
components are selected for 600kHz operation. If
300kHz or 1MHz operation is selected, component val-
ues might 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 MAX1638 data sheet).
2
_______________________________________________________________________________________
4.5V TO 5.5V
VCC
C14
0.1µF
1
L
C11
10µF 10V
3
R
2
R4
10Ω
D1
CMPSH-3
C1
220µF
10V
C2
220µF
10V
C3
220µF
10V
VIN
VIN
VIN
VIN
VIN
J1–1
J1–2
J1–3
J1–21
J1–22
9
20
V
DD
DH
R2
0.009Ω
8
LG
LX
DL
PWROK
PGND
10
REF
CSH
CSL
7
D0
FB
PDRV
NDRV
CC1
CC2
FREQ
AGND
11
REF
VCC
2
3
15
1
14
CC2
0.056µF
13
R5
1k
18
J1–23 NDRV
19
J1–5 PDRV
D1
D2
D3
D4
12
6
5
17
16
3
4
22
21
N2
C5
220µF
4V
C6
220µF
4V
C7
220µF
4V
23
C9
0.1µF
C8
220µF
4V
L1
0.47µH
R1
0.009Ω
BST
1
V
CC
N1
24
Figure 1. MAX1638VRM EV Kit Schematic
J1–11
J1–13
J1–15
J1–17
J1–19
J1–30
J1–32
J1–34
J1–36
J1–38
J1–40
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC
C12
4.7µF
16V
C10
0.1µF
2%
1% 2
0.5%
1
JU1
3
VIN
R6
100k
MAX1638
2
REF
PWRGD J1–29
R3*
100Ω
OUTEN J1–26
C13
2.2µF
10V
J1–10
J1–12
J1–14
J1–16
J1–18
J1–20
J1–31
J1–33
J1–35
J1–37
J1–39
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
SENSE
VID0
J1–7
VID1
J1–27
VID2
J1–8
VID3
J1–28
VID4
J1–9
CC1
1000pF
J1-4
12VIN
J1-6
ISHARE
J1-24
12VIN
JU2
4
J1-25
UP
Evaluates: MAX1638
_______________________________________________________________________________________
*R3 RECOMMENDED FOR REMOTE SENSING
MAX1638VRM Evaluation Kit
3
MAX1638VRM Evaluation Kit
Evaluates: MAX1638
GlitchCatcher Current-Boost Driver
Drivers for an optional current-boost circuit
(GlitchCatcher) are included in the MAX1638. The cur-
rent-boost circuit is intended to improve transient
response to fast-load step changes by bypassing the
inductor’s lowpass filter operation. When the output
voltage drops out of regulation by more than ±2%, the
P-channel or N-channel switches turn on and force the
output back into regulation. The GlitchCatcher circuit is
located on the solder side of the MAX1638VRM test
fixture. For more information, refer to the section
Choosing the GlitchCatcher
MOSFETs in the MAX1638
data sheet.
1.0"
Figure 2. MAX1638VRM EV Kit Component Placement Guide—Component Side
1.0"
Figure 3. MAX1638VRM EV Kit Component Placement Guide—Solder Side
4
_______________________________________________________________________________________
MAX1638VRM Evaluation Kit
Evaluates: MAX1638
1.0"
Figure 4. MAX1638VRM EV Kit PC Board Layout—Component Side
1.0"
Figure 5. MAX1638VRM EV Kit PC Board Layout—Internal Signal Plane (Layer 2)
_______________________________________________________________________________________
5

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