MAX15118EVKIT# Maxim Integrated, MAX15118EVKIT# Datasheet - Page 3

• Manufacturer Part Number: MAX15118EVKIT#
• Description: Power Management IC Development Tools MAX15118 Eval Kit
• Manufacturer: Maxim Integrated
• Type: Power Switchesr
• Series: MAX15118r

Specifications of MAX15118EVKIT#

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: MAX15118
• Input Voltage: 2.7 V to 5.5 V
• Output Voltage: 1.5 V
• Description/function: Evaluates high-efficiency step down regulator
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 18 A
• For Use With: MAX15118

The device utilizes an adjustable soft-start function to
limit inrush current during startup. The soft-start time is
adjusted by the value of C16, the external capacitor from
SS/REFIN to GND. By default, C16 is currently 0.1FF,
which gives a soft-start time of approximately 6ms.
To adjust the soft-start time, determine C16 using the
following formula:
where t
and C16 is in farads. C16 should be a minimum of 1nF
capacitor between SS/REFIN and GND. The resistor,
in series with the soft-start capacitor (R14), improves
load regulation.
When no external reference is applied at SS/REFIN, the
device uses the internal 0.6V reference. An external
tracking reference with steady-state value between 0
and V
the Setting the Soft-Start Time section in the MAX15118
IC data sheet for a more detailed description. During
1ms hiccup timeout, the SS/REFIN pin is pulled to GND
internally to discharge the soft-start capacitor. R6 limits
the currents from an externally supplied reference during
the 1ms hiccup timeout event.
The EV kit can be adjusted from 0.6V up to 0.94 x V
changing the values of resistors R1 and R2. To determine
the value of the resistor-divider, first select R2 between
1kI and 20kI. Then use the following equation to
calculate R1:
where V
SS/REFIN and V
is applied at SS/REFIN, the internal reference is automati-
cally selected and V
V
connected from FB to GND.
When R1 is changed, compensation components C14,
R3, and C15 must be changed to ensure loop stability
(refer to the Compensation Design Guidelines section in
the MAX15118 IC data sheet).
Maxim Integrated
OUT
=
IN
= 0.6V in skip mode, set R1 to 0I and keep R2
SS
- 2.5V can be applied to SS/REFIN. Refer to
FB
is the required soft-start time in seconds
is equal to the reference voltage at
=
R1 R2
OUT
C16
is the output. If no external reference
FB
Reference Input (SS /REFIN)
Setting the Output Voltage
(
10µA t


becomes 0.6V. When regulating
(
V
OUT FB
×
/V
SS
)
/0.6V
)
−
1
Soft-Start and


IN
by
The device features a regulator enable input. For normal
operation, a shunt should be installed on jumper JU1. To
disable the output, remove the shunt on JU1 and the EN
pin is pulled to PGND through resistor R4. See Table 1
for JU1 settings.
The device offers selectable skip-mode functionality
to reduce current consumption and achieve a higher
efficiency at light loads. To operate in skip mode, install
a shunt on pins 1-2 on jumper JU2. See Table 2 for JU2
settings. Caution: Do not change the setting of the
skip jumper while the device is operating.
The EV kit includes a 305-020-520-202-compatible edge
connector to facilitate testing of the board. Use of the
connector simplifies electrical connections in thermal
chambers, EMI chambers, and other setups that use
remote wiring. The connector places the high-power
connections on the top of the board, and the control and
measurement connections on the bottom of the board.
When interfacing to the connector, connect the negative
lead of all instruments to pin 5 of EC1 to make proper
Kelvin measurements. Q1 is optional for board-temper-
ature measurement using a MAX1617, MAX6654, or a
similar remote temperature sensor.
Table 1. Regulator Enable (EN) Jumper
JU1 Description
*Default position.
Table 2. Skip-Mode Input (SKIP) Jumper
JU2 Description
*Default position.
Not installed
POSITION
POSITION
Installed*
SHUNT
SHUNT
Evaluates: MAX15118
2-3*
1-2
Quick-Test Edge Connector (EC1)
Connected to EN
Connected to IN
Pulled to PGND
Connected to
through R4
SKIP PIN
EN PIN
PGND
Skip-Mode Input (SKIP)
Regulator Enable (EN)
DEVICE OUTPUT
Forced-PWM
Skip-mode
operation
operation
Disabled
Enabled
MODE
3