19-2198; Rev 1; 9/02
MAX1830 Evaluation Kit
General Description
The MAX1830 evaluation kit (EV kit) provides a 1.8V
output from a 3V to 5.5V input voltage source. It deliv-
ers up to 3A output current with a 94% (max) efficiency.
The MAX1830 EV kit includes the MAX1830 step-down
switching regulator with an internal synchronous rectifi-
er to increase efficiency and reduce the number of
external components. The resistor-programmable fixed-
off-time, current-mode architecture allows an optimum
response to load and line transients. This EV kit, as
configured, operates at approximately 550kHz from
3.3V inputs and 770kHz from 5V inputs.
The MAX1830 EV kit can be configured to produce a
preset output voltage of 1.5V, 1.8V, 2.5V, or is feedback
adjustable from 1.1V to V
IN
.
This EV kit can also be used to evaluate the MAX1831
with preset output voltages of 1.5V/1.8V and 3.3V, or
adjustable output voltage from 1.1V to V
IN
.
o
Delivering 3A Output Current
94% Efficiency
o
Synchronous Rectifier Improves Efficiency
o
Output Voltage Preset to 1.8V
o
1.5V, 1.8V, or 2.5V Selectable
1.1V to V
IN
Adjustable
o
3V to 5.5V Input Voltage Range
o
No External Schottky Diode Required
o
Less than 1碌A(chǔ) (typ) IC Shutdown Current
o
Surface-Mount Construction
o
Fully Assembled and Tested
Features
Evaluates: MAX1830/MAX1831
Component List
PART
DESIGNATION
C1
QTY
1
DESCRIPTION
22碌F, 6.3V ceramic capacitor (1210)
TDK C3225X5R0J226M
2.2碌F, 10V ceramic capacitor (0805)
TDK C2012X5R1A225M or
Taiyo Yuden LMK212BJ225MG
470pF ceramic capacitor (0603)
1碌F, 10V ceramic capacitor (0805)
TDK C2012X5R1A105M or
Taiyo Yuden LMK212BJ105MG
120碌F, 4V, SP capacitor
Panasonic EEFUD0G121R
Schottky diode
(not installed)
1.5碌H inductor
Sumida CDRH6D28鈥?762T064
10鈩?/div>
鹵5%
resistor (0603)
1M鈩?/div>
鹵5%
resistor (0603)
84.5k鈩?/div>
鹵1%
resistor (0805)
Not installed (0805)
Not installed (0805)
MAX1830EEE (16-pin QSOP)
2-pin header
4-pin header
Not installed (shorted with PC board
trace)
Shunts
SUPPLIER
Panasonic
Sumida
C3
C4
1
1
Taiyo Yuden
TDK
MAX1830EVKIT
Ordering Information
TEMP RANGE
0擄C to +70擄C
IC PACKAGE
16 QSOP
Component Suppliers
PHONE
201-392-7522
847-956-0666
408-573-4150
847-803-6100
FAX
201-392-4441
847-956-0702
408-573-4159
847-803-6296
C2
1
Note:
Please indicate that you are using the MAX1830 when
contacting these component suppliers.
C5
D1
L1
R1
R2
R3
R4
R5
U1
JU1
JU2
JU3
None
1
1
1
1
1
1
1
1
1
1
1
0
2
Quick Start
The MAX1830 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for proper
board operation.
Do not turn on the power supply
until all connections are completed:
1) Connect a voltmeter and load (if any) from VOUT to
GND.
2) Verify that there is a shunt on JU1 (shutdown dis-
abled).
3) Verify that the JU2 shunt is connected across pins
1 and 4 to set the output to 1.8V.
4) Connect a 3V to 5.5V supply to the pads marked
VIN and GND (supply off).
5) Turn on the power supply and verify that the output
voltage is 1.8V.
6) See the
Output Voltage Selection
section to modify
the board for a different output voltage.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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