Datasheet

Evaluates: MAX17502G in TDFN Package
MAX17502G Evaluation Kit
3Maxim Integrated
Regulator Enable/Undervoltage-Lockout
Level (EN/UVLO)
The device features an EN/UVLO input. For normal oper-
ation, no shunts should be installed across pins 1-2 or
2-3onjumperJU1.Todisabletheoutput,installashunt
across pins 2-3 on JU1 and the EN/UVLO pin is pulled
toGND.SeeTable1forJU1settings.
Setting the Undervoltage-Lockout Level
The device offers an adjustable input undervoltage-
lockout level. Set the voltage at which the device turns
on with a resistive voltage-divider connected from VIN
to GND (see Figure 1). Connect the center node of the
divider to EN/UVLO.
ChooseR1tobe3.3MI and then calculate R2 as follows:
INU
R1 1.218
R2
(V 1.218)
×
=
−
where V
INU
is the voltage at which the device is required
to turn on. Ensure that V
INU
is higher than 0.8 x V
OUT
.
Adjusting the Output Voltage
Thedevice offers an adjustable output voltage. Set the
output voltage with a resistive voltage-divider connected
from the positive terminal of the output capacitor (V
OUT
)
to GND (see Figure 6). Connect the center node of the
voltage-divider to FB.
To choose the values of R4 and R5, select the parallel
combinationofR4andR5,withR
P
less than 15kΩ. Once
R
P
is selected, calculate R4 as follows:
P OUT
RV
R4
0.9
×
=
Calculate R5 as follows:
OUT
R4 0.9
R5
(V 0.9)
×
=
−
Table 1. Regulator Enable (EN/UVLO) Jumper JU1 Settings
*Default position.
EV Kit Performance Report
Figure 1. MAX17502G Load and Line Regulation Figure 2. MAX17502G Load and Line Regulation
SHUNT POSITION EN/UVLO PIN MAX17502G OUTPUT
Not installed*
Connected to the center node of resistor-divider
R1 and R2
Enabled,UVLOlevelsetthroughtheR1andR2
resistor-divider
2-3 Connected to GND Disabled
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
900800600 700200 300 400 500100
12.20
0 1000
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
LOAD vs. LINE REGULATION
12.02
12.04
12.06
12.08
12.12
12.14
12.16
12.18
12.00
12.10
LOAD CURRENT (mA)
EFFICIENCY (%)
82
84
86
90
88
94
92
96
80
V
IN
= 24V
V
IN
= 48V
EFFICIENCY vs. LOAD CURRENT
900800600 700200 300 400 500100 1000
V
IN
= 36V