MAX1819EVKIT [MAXIM]
Evaluation Kit for the MAX1819EBL18 ; 评估板MAX1819EBL18\n
| 型号： | MAX1819EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1819EBL18
|
| 文件： | 总3页 (文件大小：93K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2341; Rev 0; 2/02
MAX1819 Evaluation Kit
General Description
The MAX1819 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 output voltages in
the 1.25V to 5.0V range by using external resistors.
1.8V Fixed Output Voltage (MAX1819EBL18)
1.25V to 5.0V Adjustable Output Voltage
(External Divider)
ꢀ Power-OK Output
ꢀ 6-Bump UCSP Package
ꢀ Surface-Mount Construction
ꢀ Fully Assembled and Tested
Component List
DESIGNATION QTY
DESCRIPTION
1µF 10%, 10V X7R ceramic
capacitor (0805)
Taiyo Yuden LMK212BJ105KG or
Murata GRM40X7R105K010AD
Ordering Information
C1
C2
1
1
PART
TEMP RANGE
IC PACKAGE
MAX1819EVKIT
0°C to +70°C
6 UCSP
Note: To evaluate the MAX1819EBL15/20/25/33/50, use
external feedback resistors.
4.7µF 20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ475MG or
TDK C2012X5R0J475M
Quick Start
The MAX1819 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
JU1
R1
1
0
3-pin header
Not installed (0603)
Not installed, pads shorted with PC
trace (0603)
Do not turn on the power supply until all connec-
tions are completed:
R2
R3
U1
0
1
1
100kΩ 5% resistor (0603)
1) Verify that the shunt is across pins 1 and 2 of
jumper JU1 (SHDN) (Table 1).
MAX1819EBL18 (6-bump UCSP)
Top mark AAG
2) Connect a voltmeter to the VOUT pad. Connect the
ground to the GND pad closest to VOUT.
None
None
None
None
1
1
1
1
Shunt
MAX1819 PC board
MAX1819EVKIT data sheet
MAX1819 data sheet
3) Connect a 2.5V to 5.5V supply to the VIN pad.
Connect the supply ground to the GND pad closest
to VIN.
4) Turn on the power supply and verify that the output
is the preset voltage of 1.8V.
To evaluate other voltages, see the Evaluating Other
Output Voltages section.
Component Suppliers
SUPPLIER
PHONE
FAX
WEBSITE
www.murata.com
Murata
770-436-1300
800-348-2496
847-803-6100
770-436-3030
847-925-0899
847-390-4405
Taiyo Yuden
TDK
www.t-yuden.com
www.component.tdk.com
Note: Please indicate that you are using the MAX1819 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.
MAX1819 Evaluation Kit
Detailed Description
Table 1. Jumper JU1 Functions
The MAX1819 EV kit contains a low-dropout, linear-
regulator 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
MAX1819 OUTPUT
LOCATION
PIN
MAX1819 enabled,
1 and 2
2 and 3
Connected to VIN
Connected to GND
V
= 1.8V
OUT
Shutdown mode,
= 0V
The MAX1819 EV kit features a shutdown mode that
reduces quiescent current to 0.1µA (typ) to preserve
the battery life.
V
OUT
Connected to an
external source
through SHDN pad
MAX1819 output
depends on external
SHDN signal levels
None
Evaluating Other Output Voltages
The output voltage of the MAX1819 EV kit is preset to
1.8V. To generate an output voltage other than the pre-
set output voltage, cut open the PC trace shorting R2,
and install feedback resistors R1 and R2. Select R2 in
the 25kΩ to 100kΩ range, then R1 is given by:
V
OUT
= V
(1 + R1 / R2)
SET
R1 = R2 [(V
/ V ) - 1]
SET
OUT
where V
= 1.25V.
SET
R3
100kΩ
VOUT
1.8V
POK
C1
A2
A1
POK
OUT
C2
U1
4.7µF
GND
6.3V
MAX1819EBL18
R1
VIN
2.5V TO 5.5V
OPEN
C2
SET
IN
C1
1.0µF
10V
R2
GND
SHORT
(PC TRACE)
1
SHDN
A3
C3
2
3
JU1
GND
SHDN
Figure 1. MAX1819 EV Kit Schematic
2
_______________________________________________________________________________________
MAX1819 Evaluation Kit
Figure 2. MAX1819 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1819 EV Kit PC Board Layout—Component Side
Figure 4. MAX1819 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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