MAX1818EVKIT [MAXIM]
Evaluation Kit for the MAX1818EUT15/MAX1818EUT18/MAX1818EUT20/MAX1818EUT25/MAX1818EUT33/MAX1818EUT50 ; 评估板MAX1818EUT15 / MAX1818EUT18 / MAX1818EUT20 / MAX1818EUT25 / MAX1818EUT33 / MAX1818EUT50
| 型号： | MAX1818EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1818EUT15/MAX1818EUT18/MAX1818EUT20/MAX1818EUT25/MAX1818EUT33/MAX1818EUT50
|
| 文件： | 总3页 (文件大小：94K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2052; Rev 0; 5/01
MAX1818 Evaluation Kit
General Description
The MAX1818 linear regulator evaluation kit (EV kit) pro-
vides a regulated +1.8V output voltage from a +2.5V to
+5.5V input source. It delivers up to 500mA output current.
Features
ꢀ +2.5V to +5.5V Input Voltage Range
ꢀ Up to 500mA Output Current
ꢀ Output Voltage
The EV kit is a fully assembled and tested surface-
mount PC board. It can also evaluate other preset volt-
ages and other output voltages in the +1.25V to +5.0V
range by using external resistors.
+1.8V Fixed Output Voltage (MAX1818EUT18)
+1.25 to +5.0V Adjustable Output Voltage
(External Divider)
ꢀ Power-OK Output
ꢀ 6-Pin SOT23 Package
ꢀ Surface-Mount Construction
ꢀ Fully Assembled and Tested
Component List
DESIGNATION QTY
DESCRIPTION
1µF 10%, 10V X7R ceramic
capacitor (0805)
C1
1
Taiyo Yuden LMK212BJ105KG
Ordering Information
4.7µF 20%, 6.3V X5R ceramic
capacitor (0805)
PART
TEMP. RANGE
IC-PACKAGE
C2
1
Taiyo Yuden JMK212BJ475MG or
TDK C2012X5R0J475M
MAX1818EVKIT
0 C to +70 C
6 SOT23
Note: To evaluate the MAX1818EUT15, /20, /25, /33, or /50,
request a MAX1818EUT15, /20, /25, /33, or /50 free sample with
the MAX1818 EV kit. Refer to soldering information in Absolute
Maximum Rating section of MAX1818 data sheet for mass
production solder reflow advice.
R1
R2
0
0
Not installed (0603)
Not installed, pads shorted with PC
trace (0603)
R3
1
1
1
1
1
1
1
100k
5% resistor (0603)
U1
MAX1818EUT18 (6-pin SOT23)
3-pin header
Quick Start
The MAX1818 EV Kit is fully assembled and tested.
Follow these steps to verify board operation.
JU1
None
None
None
None
Shunt
MAX1818 PC board
MAX1818 EV kit data sheet
MAX1818 data sheet
Do not turn on the power supply until all connec-
tions are completed.
1) Verify that the shunt is across pins 1 and 2 of
jumper JU1 (SHDN) (Table 1).
2) Connect a voltmeter to the VOUT pad. Connect the
ground to the GND pad closest to VOUT.
3) Connect a +2.5V to +5.5V supply to the VIN pad.
Connect the supply ground to the GND pad closest
to VIN.
Component Suppliers
SUPPLIER
Taiyo Yuden
TDK
PHONE
FAX
4) Turn on the power supply, and verify that the output
is the preset voltage: +1.8V.
408-573-4150
847-390-4373
408-573-4159
847-390-4428
To evaluate other voltages, refer to Evaluating Other
Output Voltages.
Note: Please indicate that you are using the MAX1818 when
contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX1818 Evaluation Kit
Detailed Description
Table 1. Jumper JU1 Functions
The MAX1818 EV kit contains a low-dropout, linear reg-
ulator circuit, which provides a +1.8V output from a
+2.5V to +5.5V input voltage. The EV kit provides up to
500mA output current. Power-OK will provide a logical
low output when the output voltage falls below 93% of
its nominal voltage.
SHUNT
SHDN
MAX1818 OUTPUT
LOCATION
PIN
MAX1818 enabled,
1 and 2
2 and 3
Connected to VIN
Connected to GND
V
= +1.8V
OUT
Shutdown mode,
= 0V
The MAX1818 EV kit features a shutdown mode that
reduces quiescent current to 0.1µA (typ) to preserve
the battery life.
V
OUT
Connected external
source to SHDN
pad
MAX1818 output
depends on external
SHDN signal
None
Evaluating Other Output Voltages
The output voltage of the MAX1818 EV kit is preset to
+1.8V. To generate an output voltage other than the
preset output voltage, cut open the PC trace shorting
R2, and install feedback resistors R1 and R2. Select R2
in the 25k to 100k range.
Table 2. MAX1818 EV Kit Corresponding
Output Voltage
V
OUT
= V
(1 + R1 / R2)
SET
MAX1818 PART
AND SUFFIX
MAX1818 EV KIT FIXED
OUTPUT VOLTAGE
R1 = R2 [(V
/ V ) - 1]
SET
OUT
where V
= 1.25V.
SET
MAX1818EUT15
MAX1818EUT18
MAX1818EUT20
MAX1818EUT25
MAX1818EUT33
+1.5V
+1.8V
+2.0V
+2.5V
+3.3V
The MAX1818 EV kit can also be used to evaluate the
MAX1818EUT15, /20, /25, /33, or /50. Replace
MAX1818EUT18 with a MAX1818EUT15, /20, /25, /33,
or /50. Hand soldering for single unit evaluation on the
EV kit is acceptable. Table 2 lists the corresponding
output voltage.
MAX1818EUT50
+5.0V
R3
100k
5%
VOUT
+1.8V
POK
6
5
2
1
POK
OUT
SET
C2
U1
4.7
F
GND
6.3V
MAX1818EUT18
R1
VIN
OPEN
+2.5V TO +5.5V
IN
C1
1.0
10V
R2
SHORT
F
GND
1
SHDN
3
4
2
3
JU1
GND
SHDN
Figure 1. MAX1818 EV Kit Schematic
2
_______________________________________________________________________________________
MAX1818 Evaluation Kit
1.0"
1.0"
Figure 2. MAX1818 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1818 EV Kit PC Board Layout—Component Side
1.0"
1.0"
Figure 4. MAX1818 EV Kit PC Board Layout—Solder Side
Figure 5. MAX1818 EV Kit Component Placement Guide—
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.
3 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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