MAX5090EVKIT Maxim Integrated Products, MAX5090EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5090EVKIT
• Description: EVAL KIT FOR MAX5090
• Manufacturer: Maxim Integrated Products

Specifications of MAX5090EVKIT

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 2A
• Voltage - Input: 7.5 ~ 76V
• Regulator Topology: Buck
• Frequency - Switching: 125kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX5090
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5090C step-down DC-DC switching regulator
output is set to 5V by feedback resistors R1 and R2. To
generate output voltages other than 5V (1.25V to 11V),
select a different external inductor, output capacitor, and
voltage-divider resistors R1 and R2. Choose R2 less
than 10kΩ and then calculate R1 as follows:
Figure 1. MAX5090 EV Kit Schematic
+7.5V TO +76V
PGND
SYNC
SGND
VIN
Evaluating Other Output Voltages
+
R
1
10kΩ
C1
68µF
100V
=
_______________________________________________________________________________________
R5
(
V
OUT
+
VIN
1 228
.
C2
68µF
100V
−
1 228
.
V
1MΩ
0.47µF
JU1
3.3µF
100V
R4
25V
V
C3
C5
VIN
)
×
R
2
R3
10Ω
10
9
4
6
5
V
ON/OFF
SYNC
VD
SGND
IN
0.047µF
14
DRAIN
C6
MAX5090C
MAX5090 Evaluation Kit
7
U1
SS
The minimum input voltage for a given output voltage is
dependent on the maximum duty cycle. Refer to the
MAX5090 IC data sheet for additional information.
The MAX5090 EV kit can also evaluate the fixed output-
voltage versions MAX5090A (3.3V) and MAX5090B
(5.0V) step-down DC-DC converters. To evaluate the
MAX5090A or MAX5090B, remove resistor R2 and
replace resistor R1 with a short or 0Ω resistance. Refer
to the MAX5090 data sheet to select components for
output voltages other than 5V.
13
DRAIN
Evaluating the MAX5090A and MAX5090B
PGND
BST
N.C.
N.C.
N.C.
FB
LX
LX
C4
1µF
100V
16
8
3
1
12
11
15
2
R2
4.42kΩ
1%
13.3kΩ
1%
R1
C7
0.22µF
16V
D1
100µH
L1
C8
100µF
+5V, 2A
VOUT
PGND
3