Datasheet

MaximIntegrated │ 3
MAX17502F Evaluation Kit Evaluates: MAX17502F in TDFN Package
www.maximintegrated.com
Regulator Enable/Undervoltage-
Lockout Level (EN/UVLO)
The device features an EN/UVLO input. For normal
operation,ashuntshouldbeinstalledacrosspins1-2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-lock-
outlevel.Setthevoltageatwhichthedeviceturnsonwith
a resistivevoltage-dividerconnected from VIN toGND.
ConnectthecenternodeofthedividertoEN/UVLO.
ChooseR1tobe3.3MΩandthencalculateR2asfollows:
INU
R1 1.218
R2
(V 1.218)
×
=
−
where V
INU
isthevoltageatwhichtheICisrequiredto
turn on.
Table 1. Regulator Enable (EN/UVLO) Jumper JU1 Settings
*EP = Exposed pad.
Figure 1. MAX17502F Load and Line Regulation
Figure 2. MAX17502F Efficiency
SHUNT POSITION EN/UVLO PIN MAX17501_ OUTPUT
1-2*
ConnectedtoIN Enabled
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 AND LINE REGULATION
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
900800600700200300 400500100
4.96
4.97
4.98
4.99
5.00
5.01
5.02
5.03
5.04
5.05
4.95
01
000
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
EFFICIENCY vs. LOAD CURRENT
LOAD CURRENT (mA)
EFFICIENCY (%)
900800600700300400 500200
60
70
80
90
100
50
10
01
000
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V