MAX15090EVKIT# Maxim Integrated, MAX15090EVKIT# Datasheet - Page 3

• Manufacturer Part Number: MAX15090EVKIT#
• Description: Power Management IC Development Tools MAX15090 Eval Kit
• Manufacturer: Maxim Integrated

Specifications of MAX15090EVKIT#

• Rohs: yes

MAX15090/MAX15090A
Evaluation Kits
Table 2. JU2 Jumper Selection (EN)
*Default position.
Setting Time-Out Delay for EN (CDLY)
Capacitor C4 is used to set the time-out delay for EN to go
low to prevent internal MOSFET shutdown after power-
up. This is set at a rate of 1s/µF. The EV kit is configured
for a 47ms time-out delay.
Delayed EN
The IC’s EN pin must be pulled low before the time-out
delay set by capacitor C4 elapses. The EV kit provides
a simple timer circuit comprised of U2, R7, and C5 to
pull the EN pin low before the time-out delay. Once PG
asserts as open-drain, R7 begins to charge C5 to the
output voltage (OUT). When C5 charges to 2/3 x OUT, U2
pulls the EN pin low. The EV kit is configured to have EN
pulled low after ~22ms.
Jumper JU2 is also provided to bypass the time-out delay
and force EN low, if installed. See Table 2 for JU2 settings.
Setting the Output Slew Rate
An external capacitor (C3) is connected from GATE to
GND on the IC to reduce the output slew rate during
startup. During startup, a 5.7µA (typ) current is sourced to
enhance the internal MOSFET with 10V/ms (typ). C3 can
be calculated according to the following formula:
where I
and ∆V
MOSFET at turn-on.
www.maximintegrated.com
Not installed*
POSITION
Installed
SHUNT
GATE
GATE
is 5.7µA (typ), ∆t is the desired slew rate,
is the voltage at the gate of the internal
C3 = (I
GATE
x ∆t)/∆V
Set low when C5 is charged to 2/3 x OUT; timing is set by R7/C5
GATE
Forced to GND
EN PIN
Undervoltage Lockout
The EV kit provides an option to configure the undervolt-
age-lockout threshold. The undervoltage-lockout thresh-
old for the device is configured by the IN voltage level
divided by R1 and (R2 + R3) at the UV pin. By default, the
undervoltage-lockout threshold is set to 10.8V.
Overvoltage Lockout
The EV kit provides an option to configure the overvolt-
age-lockout threshold. The overvoltage-lockout threshold
for the device is configured by the IN voltage level divided
by (R1 + R2) and R3 at the OV pin. By default, the over-
voltage-lockout threshold is set to 13.2V.
Current-Sense Output (ISENSE)
The IC’s ISENSE pin is the output of an accurate current-
sense amplifier and provides a source current propor-
tional to the load current flowing into the main switch. The
factory-trimmed current ratio is set to 220µA/A. On the
EV kit, this allows producing a scaled voltage by routing
resistor R6 from ISENSE to GND. This voltage signal then
goes to an ADC and provides digitized information of the
current supplied to the powered system.
Evaluate: MAX15090/MAX15090A
TIME-OUT DELAY
47ms (set by C4)
Maxim Integrated │ 3
Bypassed