MAX5080EVKIT Maxim Integrated Products, MAX5080EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5080EVKIT
• Description: EVAL KIT FOR MAX5080
• Manufacturer: Maxim Integrated Products

Specifications of MAX5080EVKIT

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 1A
• Voltage - Input: 4.5 ~ 40V
• Regulator Topology: Buck
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX5080
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

where, V
R1 is typically 6.81kΩ.
Reconfiguring the MAX5080 EV kit for a new output
voltage may require replacing inductor L1, capacitors
C3 and/or C4. To select a new value for inductor L1 or
capacitors C3 and C4, refer to the Inductor Selection,
Output Capacitor Selection, and Input Capacitor
Selection sections, respectively, in the MAX5080 IC
data sheet.
The MAX5080 EV kit UVLO threshold is configured to
4.1V with resistors R3 and R4. The MAX5080 turns on
when the input voltage V
is 1.23V or more. The UVLO threshold can be reconfig-
ured to a desired value above 4.1V by appropriately
selecting resistors R3 and R4. To reconfigure the UVLO
threshold use the following equation:
where resistor R4 should be in the 100kΩ to 600kΩ
range and V
The MAX5080 features a default 4.1V internal UVLO
threshold. Connect the ON/OFF PC board pad to VIN
PC board pad for always-on operation.
Configuring the Undervoltage Lockout
OUT
UVLO
R
3
is the desired output voltage in volts and
=
R x
is the desired UVLO threshold in volts.
_______________________________________________________________________________________
4



V
1 23
UVLO
IN
.
is above 4.1V and ON/OFF
−
1



(UVLO)
MAX5080 Evaluation Kit
The MAX5080 EV kit circuit is set to a fixed 250kHz
switching frequency by connecting the SYNC pin to
GND through resistor R8. The EV kit’s SYNC PC board
pad can be used to synchronize the MAX5080 with an
external digital clock in the 150kHz to 350kHz range.
When SYNC is driven with an external digital clock, the
MAX5080 synchronizes to the rising edge of the exter-
nal clock.
The MAX5080 IC provides the flexibility of externally
compensating its internal error amplifier to achieve sta-
bility for various applications. The MAX5080 EV kit cir-
cuit is compensated by appropriately choosing values
for resistors R1, R5, R7, and capacitors C5, C7, and
C8. To reconfigure the compensation network for spe-
cific requirements, refer to the Compensation Design
section in the MAX5080 IC data sheet.
The MAX5080 EV kit can also evaluate the MAX5081,
MAX5082, or MAX5083 step-down converters. The
MAX5080 IC must be removed and replaced with the
desired IC. Refer to MAX5080/MAX5081 or
MAX5082/MAX5083 IC data sheets for detailed infor-
mation about these parts. Some of the EV kit’s compo-
nents may need replacement when evaluating
MAX5081, MAX5082, or MAX5083 ICs.
Evaluating MAX5081/MAX5082/MAX5083
Synchronization Input (SYNC)
Compensation Network
3