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19-1293; Rev 0; 10/97
MAX1649 Evaluation Kit
________________General Description
The MAX1649 evaluation kit (EV kit) provides a regulat-
ed 5V output voltage from a 5.5V to 16.5V source. The
circuit is configured to deliver up to 1.5A of output cur-
rent using all surface-mount components. The
MAX1649’s low quiescent current and unique current-
limited PFM control scheme provide high efficiency
over a wide range of load currents.
The MAX1649 EV kit can also be used to evaluate the
MAX1651 (3.3V output), MAX649, MAX651, and
MAX652. However, the MAX1649/MAX1651 are
improved versions of the MAX649/MAX651, and are
recommended for new designs.
____________________________Features
o
+5.5V to +16.5V Input Supply Range
o
Over 90% Efficiency for 10mA to 1.5A Loads
o
100µA (max) Quiescent Supply Current
o
Fixed 5V or Optional Adjustable Output Voltage
o
1.5A Output Current Capability
o
Fully Assembled and Tested
Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651
______________Ordering Information
PART
TEMP. RANGE
0°C to +70°C
BOARD TYPE
Surface Mount
MAX1649EVKIT-SO
____________________Component List
DESIGNATION QTY
C1, C6
C2
C3, C4
C5, C7
D1
JU1
L1
P1
2
1
2
0
1
1
1
1
DESCRIPTION
68µF, 20V, low-ESR tantalum capacitors
AVX TPSE686M020R0150
330µF, 10V, low-ESR tantalum capacitor
AVX TPSE337K010R0060 or
Sprague 595D337X0010R
0.1µF ceramic capacitors
Not installed
Schottky diode
Nihon NSQ03A03 (3A) or
SGS Thomson STP52L25L (2A)
3-pin header
47µH inductor (SMT)
Sumida CDRH125-470
P-channel MOSFET (SO-8)
International Rectifier IRF7416 or
Fairchild NDS8435A
0.05Ω, 5% resistor (SMT)
IRC LR2010-01-R050-J or
Dale WSL-2010-R050-J
Not installed
MAX1649ESA
Shunt
MAX1649/MAX1651 data sheet
______________Component Suppliers
Supplier
AVX
Dale-Vishay
Fairchild
International
Rectifier
IRC
Motorola
Nihon
SGS Thomson
Sprague
Sumida–USA
Phone
(803) 946-0690
(402) 564-3131
(408) 721-2181
(310) 322-3331
(512) 992-7900
(303) 675-2140
(805) 867-2555
(617) 259-0300
(603) 224-1961
(847) 956-0666
Fax
(803) 626-3123
(402) 563-6418
(408) 721-1635
(310) 322-3332
(512) 992-3377
(303) 675-2150
(805) 867-2698
(617) 259-9442
(603) 224-1430
(847) 956-0702
Note:
Please indicate that you are using the MAX1649 when
contacting these component suppliers.
R1
R2, R3
U1
None
None
1
0
1
1
1
________________________ Quick Start
The MAX1649 evaluation kit (EV) kit is fully assembled
and tested. Follow the steps below to verify board
operation.
Do not turn on the power supply until all
connections are completed.
1) Connect a +5.5V to +16.5V power supply to the
pad marked VIN.
2) Connect ground to the GND pad.
3) Connect a voltmeter and load (if any) to the VOUT
pad.
4) For normal operation, place the shunt across pins
1 and 2 of jumper JU1.
5) Turn on the power supply and verify that the output
voltage is 5V.
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.
MAX1649 Evaluation Kit
Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651
_______________Detailed Description
Shutdown Control
The MAX1649 provides a SHDN pin to disable the out-
put. Table 1 lists the options available for shutdown
control jumper JU1. An external controller can be used
by removing the shunt on JU1 completely and connect-
ing the external controller to the pad labeled SHDN.
SHDN is a TTL/CMOS logic-level input.
able. However, the input voltage must be high enough
to avoid dropout (see the
Typical Operating Charac-
teristics
section of the MAX1649/MAX1651 data sheet).
Evaluating the MAX649/MAX651/MAX652
The MAX1649 EV kit can also be used to evaluate the
MAX649/MAX651/MAX652. In addition to replacing the
MAX1649 with a MAX649, change resistor R1 to 0.1Ω.
Contact Maxim for free samples of the MAX649CSA,
MAX651CSA, or MAX652CSA. Note that the MAX1649/
MAX1651 are recommended over the MAX649/
MAX651/MAX652 for new designs.
Output Voltage Adjustment
The output voltage can be adjusted with minor modifi-
cations to the EV kit board. First, select output voltage
divider resistors R2 and R3 (refer to the
Setting the
Output Voltage
section of the MAX1649 data sheet).
Second, open jumper JU3 and resistor R3 by cutting
the thin PC board trace between their pads. Finally,
install R2 and R3. The standard output filter capacitor is
rated at 10V. Use a higher-rated capacitor if necessary.
When using the MAX1651 or when adjusting the output
of either device, an input voltage below 5.5V is accept-
Table 1. Jumper JU1 Functions
SHUNT LOCATION
1&2
2&3
SHDN PIN
Connected to GND
Connected to V
IN
MAX1649 OUTPUT
MAX1649 enabled,
V
OUT
= 5V
Shutdown mode,
V
OUT
= 0V
V
IN
5.5V to 16.5V
C1
68µF
20V
5
OFF
3
SHDN
JU1
1
2
4
C3
0.1µF
ON
C4
0.1µF
3
V+
U1
CS
3 2 1
7
4
P1
8 7 6 5
OUT
1
JU3
CUT HERE
8
GND
FB
2
R2
OPEN
D1
C2
330µF
10V
C7
OPEN
C6
68µF
20V
6
R1
0.05Ω
GND
MAX1649
SHDN
EXT
L1
47µH
V
OUT
REF
R3
0Ω
(PCB TRACE)
C5
OPEN
Figure 1. MAX1649 EV Kit Schematic
2
_______________________________________________________________________________________
MAX1649 Evaluation Kit
Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651
1.0"
Figure 2. MAX1649 EV Kit Component Placement Guide—
Component Side
1.0"
Figure 3. MAX1649 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX1649 EV Kit PC Board Layout—Solder Side
_______________________________________________________________________________________
3
MAX1649 Evaluation Kit
Evaluates: MAX649/MAX651/MAX652/MAX1649/MAX1651
NOTES
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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