MAXIM MAX1819EVKIT

19-2341; Rev 0; 2/02
MAX1819 Evaluation Kit
Features
♦ 2.5V to 5.5V Input Voltage Range
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.
♦ Output Voltage
1.8V Fixed Output Voltage (MAX1819EBL18)
1.25V to 5.0V Adjustable Output Voltage
(External Divider)
♦ Up to 500mA Output Current
♦ Power-OK Output
♦ 6-Bump UCSP Package
Component List
DESIGNATION
C1
QTY
1
♦ Surface-Mount Construction
♦ Fully Assembled and Tested
DESCRIPTION
1µF ±10%, 10V X7R ceramic
capacitor (0805)
Taiyo Yuden LMK212BJ105KG or
Murata GRM40X7R105K010AD
Ordering Information
PART
MAX1819EVKIT
TEMP RANGE
0°C to +70°C
IC PACKAGE
6 UCSP
C2
1
4.7µF ±20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ475MG or
TDK C2012X5R0J475M
JU1
1
3-pin header
R1
0
Not installed (0603)
The MAX1819 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
R2
0
Not installed, pads shorted with PC
trace (0603)
Do not turn on the power supply until all connections are completed:
R3
1
100kΩ ±5% resistor (0603)
U1
1
MAX1819EBL18 (6-bump UCSP)
Top mark AAG
1) Verify that the shunt is across pins 1 and 2 of
jumper JU1 (SHDN) (Table 1).
None
1
Shunt
None
1
MAX1819 PC board
None
1
MAX1819EVKIT data sheet
None
1
MAX1819 data sheet
Note: To evaluate the MAX1819EBL15/20/25/33/50, use
external feedback resistors.
Quick Start
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.
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
Murata
770-436-1300
770-436-3030
www.murata.com
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
847-803-6100
847-390-4405
www.component.tdk.com
TDK
WEBSITE
Note: Please indicate that you are using the MAX1819 when contacting these component suppliers.
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates: MAX1819EBL18
General Description
The MAX1819 linear regulator evaluation kit (EV kit) provides a regulated 1.8V output voltage from a 2.5V to 5.5V
input source. It delivers up to 500mA output current.
Evaluates: MAX1819EBL18
MAX1819 Evaluation Kit
Detailed Description
Table 1. Jumper JU1 Functions
The MAX1819 EV kit contains a low-dropout, linearregulator 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.
SHDN
PIN
SHUNT
LOCATION
The MAX1819 EV kit features a shutdown mode that
reduces quiescent current to 0.1µA (typ) to preserve
the battery life.
MAX1819 OUTPUT
1 and 2
Connected to VIN
MAX1819 enabled,
VOUT = 1.8V
2 and 3
Connected to GND
Shutdown mode,
VOUT = 0V
None
Connected to an
external source
through SHDN pad
MAX1819 output
depends on external
SHDN signal levels
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 preset 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:
VOUT = VSET (1 + R1 / R2)
R1 = R2 [(VOUT / VSET) - 1]
where VSET = 1.25V.
R3
100kΩ
POK
A2
POK
OUT
VOUT
1.8V
C1
C2
4.7µF
6.3V
U1
MAX1819EBL18
R1
OPEN
VIN
2.5V TO 5.5V
GND
GND
A1
IN
SET
C2
C1
1.0µF
10V
R2
SHORT
(PC TRACE)
1
SHDN
2
3
JU1
A3
SHDN
GND
C3
Figure 1. MAX1819 EV Kit Schematic
2
_______________________________________________________________________________________
MAX1819 Evaluation Kit
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.
Evaluates: MAX1819EBL18
Figure 2. MAX1819 EV Kit Component Placement Guide—
Component Side