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MAX77324 Evaluation Kit
Evaluates: MAX77324
General Description
The MAX77324 evaluation kit (EV kit) provides a proven
design to evaluate a high-efficiency synchronous step-
down DC-DC converter with integrated MOSFETs that
operate over a 2.5V to 4.8V input voltage range, 0.6V to
2V output voltage range, and supports up to 1.5A of load
current. The device automatically transitions between
PWM and SKIP modes of operation when the load condi-
tion changes.
Benefits and Features
● Proven PCB Reference Design and Layout
● Fully Assembled and Tested
● Sense Points for High-Accuracy Measurements
● Test Point and Jumper for Enable
Ordering Information
appears at end of data sheet.
Figure 1. MAX77324 EV Kit Photo
319-100200; Rev 0; 5/18
MAX77324 Evaluation Kit
Evaluates: MAX77324
Quick Start
Required Equipment
●
●
●
●
MAX77324 EV kit
Power supply with 6V and 1A capability
Two digital voltmeter (DVM)
Ammeter
Detailed Description
Enabling and Disabling the Regulator
Turn on the device by installing a jumper between posi-
tions 1-2 on J1. The jumper connects the EN pin to V
IN
,
enabling the regulator with soft-start. Remove jumper
J1 to disable the regulator. EN has an internal pulldown
resistor to ground.
Procedure
1)
2)
The EV kit is fully assembled and tested. Follow these
steps to verify board operation:
Install J1 as recommended in
Table 1.
Connect a disabled 3.8V bench power supply through
an ammeter to the V
IN
and PGND inputs. Set the in-
put current limit of the bench power supply to 100mA.
Set the ammeter range to its 10mA setting.
Do not
enable the output of the bench supply until prompted.
Connect a voltmeter to the VINS and GNDS terminals
to measure input voltage.
Connect a voltmeter to the VOUTS and GNDS termi-
nals to measure output voltage.
Enable the output of the bench power supply.
At this point, your setup is complete and the device
under test (DUT) is Enabled. Confirm that your input
current ammeter has ~45μA.
If the input current in the above step is correct, in-
crease the input current limit of the bench supply to
1A. Also, increase the input ammeter range to 3A.
Observe the output voltage on the voltmeter between
VOUTS and GNDS. Confirm that the output voltage
matches the expected output voltage (refer to the
Set-
ting the Output Voltage
section of the data sheet).
●
At higher load/input currents, the input current
ammeter must either be set to a higher range
or bypassed, so as not to drop the input voltage
(measured at VINS) below operating voltages.
Table 1. Default Shunt Positions and
Jumper Descriptions
REFERENCE
DESIGNATOR
DEFAULT
POSITION
FUNCTION
1-2:
Connects EN to V
IN
to
enable the regulator.
Open:
Disconnect EN from
V
IN
to disable the regulator.
EN has an internal
pulldown resistor to ground.
J1
1-2
3)
4)
5)
6)
7)
8)
Table 2. Setting the Output Voltage
V
OUT
(V)
0.6
0.85
0.9
0.95
1.0
1.1
1.2
1.35
1.5
1.8
2.0
R
TOP
(kΩ
)
Short
12.4
15
17.8
20
24.8
30.1
37.4
45.3
60.4
69.8
R
BOT
(kΩ)
Open
30.1
30.1
30.1
30.1
30.1
30.1
30.1
30.1
30.1
30.1
C
TOP
(pF)
Open
220
220
220
220
220
220
220
220
220
220
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MAX77324 Evaluation Kit
Evaluates: MAX77324
Setting the Output Voltage
The device uses resistors to set the output voltage
between 0.6V and 2V. Connect a resistor divider between
V
OUT
, FB, and AGND as shown in
Figure 2.
Choose
R
BOT
(FB to AGND) to be less than or equal to 30.1kΩ.
One percent accuracy resistors are highly recommended
to keep the accuracy of V
OUT
. Calculate the value of
R
TOP
(V
OUT
to FB) for a desired output voltage with
Equation 1.
Equation 1:
V
R
T O P
=
B O T
×
O U T
−
1
R
V
FB
Where V
FB
is 0.6V and V
OUT
is the desired output
voltage.
CTOP is to maintain the stability of the device. Suggest
CTOP to be 220pF for the full operation range of the
device.
On the MAX77324 evaluation board, default V
OUT
is set
to 1.2V by choosing the value of both R
BOT
and R
TOP
to
be equal (30.1kΩ).
V
OUT
MAX77324
R
TOP
FB
R
BOT
C
TOP
Figure 2. Setting the Output Voltage for MAX77324
Ordering Information
PART
MAX77324EVKIT#
#Denotes
RoHS compliant.
TYPE
EV Kit
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Maxim Integrated │
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MAX77324 Evaluation Kit
Evaluates: MAX77324
MAX77324 EV Kit Bill of Materials
PART
C2, C3
C4
C7
J1
L1
R1, R2
U1
C1, C5
C6, C8
—
—
QTY
2
1
1
1
1
2
1
0
0
1
1
DESCRIPTION
22µF ±20%,
6.3V, X5R ceramic capacitor (0603)
C1608X5R0J226M080AC
220pF ±10%, 50V, X7R ceramic capacitor (0402)
GRM155R71H221KA01
100µF
±20%, 6.3V, tantalum capacitor (3528)
TCJB107M006R0070
2-Pin header
0.47µH ±20%, 4.90A inductor (2520)
GLULKR4701A
30.1kΩ ±1% resistor (0402)
MAX77324EWTAD+
(6 WLP)
Not installed, capacitor (0603)
Not installed, capacitor (0402)
Shunt
PCB: MAX77324 EV Kit
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Maxim Integrated │
4
PGND3
MAXIMPAD
PBC02SAAN
OPEN
22UF
0603
C1
C2
+
1
6.3V
LX
0.47UH
A2
1
2
LX
L1
2
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U1
EN
J1
MAX77324 EV Schematic
MAX77324 Evaluation Kit
TP
B1
EN
VINS
MAX77324
PGND2
MAXIMPAD
VIN
1
VIN
2
A1
EN
VIN
VIN
MAXIMPAD
100UF
C7
VOUT
0603_FF
0402_FF
VOUT
MAXIMPAD
0402_FF
4.90A
GLULKR4701A
VOUTS
22UF
0603
6.3V
C3
OPEN
C5
OPEN
C6
OPEN
C8
GNDS
PGND
A3
PGND
MAXIMPAD
C4
220PF
0402
B2
AGND
FB
B3
FB
R1
R2
30.1K
0402
0402
30.1K
Evaluates: MAX77324
Maxim Integrated │
5
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