MAX15034BEVKIT+ Maxim Integrated Products, MAX15034BEVKIT+ Datasheet - Page 22

• Manufacturer Part Number: MAX15034BEVKIT+
• Description: KIT EVALUATION FOR MAX15034
• Manufacturer: Maxim Integrated Products

Specifications of MAX15034BEVKIT+

• Main Purpose: DC/DC, Step Down
• Voltage - Input: 5 ~ 28V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: MAX15034
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Frequency - Switching: -
• Outputs And Type: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
The MAX15034 provides precision average current-limit
programmability while using standard sense resistors
or shunts. Use the equation below to determine the
appropriate V
AVGLIMIT:
For example, assuming the desired average current
limit is 18A, and R
where R
rent, wattage rating, and circuit parasitics (see above)
and I
the average current-limit reference voltage selected for
a desired I
divider from REG to AGND. See the Programming the
Average Current Limit section.
The second current-protection circuit is the hiccup fault
protection as explained in the Hiccup Fault Protection
section. The average current during a short at the out-
put is given by:
Figure 10. Inductive Sense Resistor
22
V
AVGLIMIT
______________________________________________________________________________________
LOAD(MAX)
V
SENSE
AVGLIMIT
I
=
LOAD(MAX)
AVG SHORT
(
56
AVGLIMIT
(
is determined from maximum load cur-
×
from circuit requirements. V
R
MAX15034
SENSE
=
=
SENSE
1910
(
2
)
m
and is set by a resistive voltage-
=
Ω
external reference voltage at
[
= 2mΩ.
mV
0 0625
m
CSN_
×
.
CSP_
Ω
LX_
36 18
]
=
×
1 91
×
I
LOAD MAX
.
×
V
I
A
LOAD MAX
(
)
+
612 5
(
)
[ ]
A
.
)
AVGLIMIT
mV
)
C2
+
6 6 12 5 . mV
L
OUT
is
The MAX15034 average current-limit reference voltage
is set by connecting a resistor-divider network from
REG to AGND, the center node is connected to
AVGLIMIT. The resistive divider’s upper resistor, R1, is
connected between REG and the AVGLIMIT. The resis-
tive divider’s lower resistor, R2, is connected between
the AVGLIMIT and AGND.
The resistor-divider values are determined by first,
choosing R2. To minimize reference noise select R2
such that (R1 + R2) < 100kΩ; a typical value is 10kΩ.
Next, determine R1 from:
From the example above, assuming V
A standard value for R1 is 16.2kΩ. Connect AVGLIMIT
to AGND for default current limit
Programming the Average Current Limit
SENSE RESISTOR (INDUCTIVE)
R
R
ESL
1
R1
1 10
=
=
=
10
R
2
k
×
k
Ω
Ω
⎛
⎝ ⎜
×
R
V
SENSE
×
C1
⎛
⎜
⎝
AVGLIMIT
⎛
⎝ ⎜
V
V
1 91
REG
AVGLIMT
.
5
V
V
−
5
1
−
R2
V
⎞
⎠ ⎟
( (
1
MAX
=
⎞
⎠ ⎟
⎛
⎝ ⎜
R
16 18
20 4 .
AVGLIMIT
SENSE
)
.
[ ]
C3
V
mV
k
−
Ω
V
⎟ 1
OUT
⎞
⎠ ⎟
⎞
⎠
.
= 1.91V: