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MAX38903 TDFN Evaluation Kit
Evaluates: MAX38903A/MAX38903B
General Description
The MAX38903 TDFN evaluation kit (EV kit) evaluates
the MAX38903A/MAX38903B IC family of low noise linear
regulators. The EV kit operates over an input range of
1.7V to 5.5V and provides any output voltage range from
0.6V to 5.3V, and delivers up to 1A of current. The EV kit
comes with the MAX38903BATB+ installed.
Quick Start
Required Equipment
●
●
●
●
MAX38903 TDFN EV kit
5.5V, 1A DC power supply
Electronic load capable of 1A
Digital voltmeter (DVM)
Features
●
Evaluates the MAX38903A/MAX38903B IC in a
10-pin (3mm x 3mm) TDFN
●
1.7V to 5.5V Input Range
●
0.6V to 5.3V Resistor Configurable Output Voltage
(MAX38903B, On Board with Output Set to 3.3V)
●
1.2V to 5.0V Jumper Configurable Output Voltage
(MAX38903A, with IC Replacement)
●
Up to 1A Output Current
●
Proven 2-Layer 1 oz Copper PCB Layout
●
Demonstrates Compact Solution Size
●
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on power supply until all connections
are completed.
1)
2)
3)
4)
5)
6)
7)
Verify that jumpers JU101, SELA and SELB are in
their default positions, as shown in Tables 1, 2, and 3.
Connect the 5.5V power supply between the IN and
nearest GND terminal posts.
Connect the 1A electronic load between the OUT
and nearest GND terminal posts.
Connect the DVM between the OUT and nearest
GND terminal posts.
Turn on the power supply.
Enable the electronic load.
Verify that the voltage at the OUT terminal post is
approximately 3.3V.
MAX38903 TDFN EV Kit Files
FILE
MAX38903 TDFN EV Kit BOM
MAX38903 TDFN EV Kit PCB Layout
MAX38903 TDFN EV Kit Schematic
DECRIPTION
EV Kit Bill of Material
EV Kit Layout
EV Kit Schematic
319-100262; Rev 0; 10/18
MAX38903 TDFN Evaluation Kit
Evaluates: MAX38903A/MAX38903B
Detailed Description of Hardware
The MAX38903 TDFN EV kit evaluates the MAX38903A/
MAX38903B IC family. The MAX38903A/MAX38903B
are low noise linear regulators that deliver 1A of output
current with only 12uV
RMS
of output noise from 10Hz to
100kHz. These regulators require only 100mV of input-to-
output headroom at full load.
The MAX38903 TDFN EV kit operates over an input range
of 1.7V to 5.5V. The EV Kit comes with the MAX38903BATB
+ installed and the output voltage is resistor configured to
3.3V and can deliver 1A of current. The output voltage on
the MAX38903B can be reconfigured to other voltages
from 0.6V to 5.3V by replacing feedback resistors R101
and R102. Refer to the MAX38903 IC data sheet for feed-
back resistor calculation.
Table 1. EN on MAX38903A/B (JU101)
JU101
SHUNT POSITION
1-2*
2-3
*Default
position.
DESCRIPTION
Enabled. EN = IN
Disabled. EN = GND
Table 2. GS on MAX38903B (SELA)
SELA
SHUNT POSITION
1-2
2-3*
*Default
position.
DESCRIPTION
Not allowed (for MAX38903A output
selection)
GS = GND
EN for the MAX38903A/B
The EV kit provides a jumper JU101 to enable or disable
the MAX38903B (or the MAX38903A after IC replace-
ment). Refer to
Table 1
for jumper setting of jumper JU101.
Table 3. POK on MAX38903B (SELB)
SELA
SHUNT POSITION
1-2
2-3
Not Installed*
*Default
position.
DESCRIPTION
Not allowed (for MAX38903A output
selection)
Not allowed (for MAX38903A output
selection)
Access signal at the POK test point
GS for the MAX38903B
When evaluating the MAX38903B, the Ground Sense (GS)
pin must be connected to ground to stabilize the output
with load. The EV kit provides a jumper SELA to con-
nect the MAX38903B GS pin to ground. Refer to
Table 2
for jumper setting of jumper SELA.
POK for the MAX38903B
The EV kit provides a test point to access the POK output
signal from the MAX38903B. Remove shunt from jumper
SELB to access the MAX38903B POK test point. Refer to
Table 3
for jumper setting of jumper SELB.
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MAX38903 TDFN Evaluation Kit
Evaluates: MAX38903A/MAX38903B
Evaluating the MAX38903A
The EV kit can evaluate the MAX38903A after IC (U1)
replacement. When evaluating the MAX38903A, modify
the EV kit with the steps listed below:
1)
2)
3)
4)
Replace U1 with the MAX38903AATB+.
Replace R101 with a 0Ω resistor.
Remove R102.
Refer to
Table 4
to configure the MAX38903A
output voltage using jumpers SELA and SELB.
Output Selection (SELA and SELB) for the
MAX38903A
The EV kit provides a set of jumpers SELA and SELB to
configure the output voltage of the MAX38903A, after IC
(U1) replacement. Refer to
Table 4
for jumper setting of
jumpers SELA and SELB.
Table 4. SELA and SELB on MAX38903A (SELA, SELB)
SELA
SHUNT POSITION
Not Installed
1-2
Not Installed
Not Installed
2-3
2-3
2-3
1-2
1-2*
*Default
position.
SELA
CONNECTION
Hi-Z
IN
Hi-Z
Hi-Z
GND
GND
GND
IN
IN
SHUNT POSITION
1-2
Not Installed
2-3
Not Installed
2-3
1-2
Not Installed
2-3
1-2*
SELB
SELB
CONNECTION
IN
Hi-Z
GND
Hi-Z
GND
IN
Hi-Z
GND
IN
OUTPUT
VOLTAGE
1.2
1.5
1.8
2.5
3.0
3.1
3.3
4.0
5.0
Component Suppliers
SUPPLIER
Murata/TOKO
TDK
Samsung Electro-Mechanics America. Inc.
www.murata.com
www.tdk.com
www.samsungsem.com
WEBSITE
Note:
Indicate that you are using the MAX38903A/B when contacting these component suppliers.
Ordering Information
PART
MAX38903EVKIT#TDFN
#Denotes
RoHS
TYPE
EV Kit
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MAX38903 TDFN Evaluation Kit
Evaluates: MAX38903A/MAX38903B
MAX38903 TDFN EV Kit Bill of Materials
ITEM
1
REF_DES
C101
DNI/DNP
-
QTY
1
MFG PART #
C0603C473K5RAC;
GCM188R71H473K;
GRM188R71H473K
MANUFACTURER
KEMET;MURATA;
MURATA
VALUE
0.047UF
DESCRIPTION
CAPACITOR; SMT (0603);
CERAMIC CHIP; 0.047UF; 50V;
TOL=10%; MODEL=X7R; TG=-55
DEGC TO +125 DEGC; TC=
CAPACITOR; SMT (0603);
CERAMIC CHIP; 10UF; 6.3V;
TOL=20%; MODEL=CL SERIES;
TG=-55 DEGC TO +125 DEGC;
TC=X7R
CONNECTOR; MALE;
PANELMOUNT; BANANA JACK;
STRAIGHT; 1PIN
EVK KIT PARTS; MAXIM
PAD; WIRE; NATURAL; SOLID;
WEICO WIRE; SOFT DRAWN BUS
TYPE-S; 20AWG
CONNECTOR; MALE;
THROUGH HOLE; BREAKAWAY;
STRAIGHT; 3PINS
TEST POINT; PIN DIA=0.1IN;
TOTAL LENGTH=0.3IN; BOARD
HOLE=0.04IN; WHITE; PHOSPHOR
BRONZE WIRE SILVER;
RESISTOR; 0603; 909K OHM;
1%; 100PPM; 0.1W; THICK FILM
RESISTOR; 0603; 200K OHM;
1%; 100PPM; 0.1W; THICK FILM
RESISTOR; 0603; 100K; 1%;
100PPM; 0.10W; THICK FILM
TEST POINT; JUMPER; STR;
TOTAL LENGTH=0.256IN; BLACK;
INSULATION=PBT
CONTACT=PHOSPHOR BRONZE;
COPPER PLATED TIN OVERALL
CONNECTOR;WIREMOUNT;
CIRCUITBOARDTESTPOINTMINIAT
UREPROBE;STRAIGHT;4PINS
TEST POINT; PIN DIA=0.1IN;
TOTAL LENGTH=0.3IN; BOARD
HOLE=0.04IN; BLACK; PHOSPHOR
BRONZE WIRE SILVER PLATE
FINISH;
TEST POINT; PIN DIA=0.1IN;
TOTAL LENGTH=0.3IN; BOARD
HOLE=0.04IN; RED; PHOSPHOR
BRONZE WIRE SILVER PLATE
FINISH;
EVKIT PART-IC; PACKAGE
CODE: T1033+1C; PACKAGE
OUTLINE NUMBER: 21-0137
PCB:MAX38903TDFN
PACKAGE OUTLINE 0603
NON-POLAR CAPACITOR
PACKAGE OUTLINE 0603
RESISTOR
PACKAGE OUTLINE 0603
RESISTOR
-
(TP1:IN)
(TP6:OUT)
COMMENTS
2
C102, C103
-
2
CL10B106MQ8NRN
SAMSUNG
ELECTRONICS
10UF
3
GND, IN, OUT
GND_PAD,
IN_PAD,
OUT_PAD
JU101, SELA,
SELB
-
3
108-0740-001
EMERSON
NETWORK POWER
108-0740-001
4
-
3
9020 BUSS
WEICO WIRE
MAXIMPAD
5
-
3
PEC03SAAN
SULLINS
PEC03SAAN
6
POK
-
1
5002 KEYSTONE
N/A
7
8
9
R101
R102
R103
-
-
-
1
1
1
CRCW0603909KFK
ERJ-3EKF2003
CRCW0603100KFK
VISHAY DALE
PANASONIC
VISHAY DALE
909K
200K
100K
10
SU1-SU3
-
3
STC02SYAN
SULLINS ELECTRONICS
STC02SYAN
CORP.
11
TP1, TP6
-
2
131-4353-00
TEKTRONICS
131-4353-00
12
TP_GND
-
1
5001 KEYSTONE
N/A
13
TP_OUT
-
1
5000 KEYSTONE
N/A
14
15
16
17
18
TOTAL
U1
PCB
C104
R104
R105
-
-
DNP
DNP
DNP
1
1
0
0
0
25
MAX38903BATB+
MAX38903TDFN
N/A
N/A
N/A
MAXIM
MAXIM
N/A
N/A
N/A
MAX38903BATB+
PCB
OPEN
OPEN
SHORT
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4
4
JU101
PEC03SAAN
3
SELB
PEC03SAAN
2
C102
OPEN
C104
11
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U1
MAX38903BATB+
1
IN
OUT
OUT
BYP
OUTS_FB
SELB_POK
EP
TP_OUT
MAXIMPAD
IN
10
9
8
0.047UF
MAXIMPAD
OUT
OUT
MAX38903 TDFN Evaluation Kit
MAX38903 TDFN EV Kit Schematic
IN
1.7V TO 5.5V
2
R105
3
4
5
SELA_GS
EN
6
GND
7
IN
C101
108-0740-001
108-0740-001
IN
131-4353-00
SHORT
OUT
131-4353-00
1
1
10UF
R104
909K
R101
100K
R103
C103
10UF
2
3
4
OPEN
GND_IN
PEC03SAAN
R102
SELA
TP_GND
200K
GND_OUT
GND
108-0740-001
Evaluates: MAX38903A/MAX38903B
POK
GND
MAXIMPAD
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