MAX5035EVKIT Maxim Integrated Products, MAX5035EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5035EVKIT
• Description: EVAL KIT FOR MAX5035
• Manufacturer: Maxim Integrated Products

Specifications of MAX5035EVKIT

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 1A
• Voltage - Input: 8 ~ 76V
• Regulator Topology: Buck
• Frequency - Switching: 125kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX5035
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX5035 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 12V),
select different external voltage-divider resistors for R1
and R2. Refer to the Setting the Output Voltage section
in the MAX5035 data sheet for instructions on selecting
the resistors. The minimum input voltage for a given
output voltage is maximum duty-cycle dependent for
that input voltage. Refer to the MAX5035 data sheet for
additional information.
The MAX5035 EV kit can be configured for various
startup delays. To evaluate a startup delay, cut open
the PCB trace shorting resistor R4 and install the
desired surface-mount resistor (0805 case). Capacitor
C5 (0805 case) must also be selected and installed.
Refer to the MAX5035 data sheet’s Shutdown Mode
and Undervoltage Lockout (UVLO) sections to select
values for resistor R4 and capacitor C5.
Figure 1. MAX5035 EV Kit Schematic
SHDN
GND
VIN
VIN
Sequencing Two DC-DC Converters
Evaluating Other Output Voltages
130kΩ
68µF
100V
JU1
C1
1%
R3
_______________________________________________________________________________________
1
2
3
0.22µF
45.3kΩ
100V
C6
1%
R5
PC TRACE
Startup Delays/
SHORT
R4
OPEN
0.1µF
C5
C4
3
5
7
2
SGND
SHDN
V
VD
IN
MAX5035
MAX5035 Evaluation Kit
GND
U1
6
The MAX5035 EV kit’s startup delay can also be utilized
to sequence two MAX5035 EV kits. Components
R4
the startup delay between the two EV kits. The following
equation can be used to select values for R4 and C5:
where Time_delay is the desired startup delay time,
V
pad on the EV kit and 1.69V (typ) is the on/off threshold
voltage of the MAX5035.
SHUT_DOWN
EVKIT1
BST
FB
LX
, R4
C
5
4
1
8
=
EVKIT2
is the desired startup voltage at the SHDN







−
R x
R2
13.3kΩ
1%
D1
C3
0.1µF
4
, C5
ln
EVKIT1
Time delay
41.2kΩ



100µH
1
1%
R1
L1
−
V
_
SHUT DOWN
and C5
1 69
.
_
V
EVKIT2
C2
68µF
10V










determine
VOUT
GND
3