Datasheet

Maxim Integrated │ 4
MAX17503 4.5V-60V, 2.5A, High-Efciency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
www.maximintegrated.com
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
=24V,R
RT
= 40.2kI(500kHz),C
VCC
=2.2μF,V
PGND
= V
SGND
= V
MODE
= V
SYNC
= 0V, LX = SS = RESET = open,
V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= T
J
= -40ºC to +125ºC, unless otherwise noted. Typical values are at T
A
= +25ºC. All voltages are
referencedtoSGND,unlessotherwisenoted.)(Note2)
Note 2: All limits are 100% tested at +25ºC. Limits over temperature are guaranteed by design.
Note 3: See the Overcurrent Protection/Hiccup Mode Section for more details.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYNC Pulse Width 50 ns
SYNC Threshold
V
IH
2.1
V
V
IL
0.8
FB Undervoltage Trip Level to
CauseHiccup
V
FB-HICF
0.56 0.58 0.65 V
HiccupTimeout (Note 3) 32,768 Cycles
Minimum On-Time t
ON-MIN
135 ns
Minimum Off-Time t
OFF-MIN
140 160 ns
LX Dead Time 5 ns
RESET
RESET Output Level Low I
RESET
= 10mA 0.4 V
RESET Output Leakage Current T
A
= T
J
= +25ºC, V
RESET
= 5.5V -0.1 +0.1 µA
FB Threshold for RESET Assertion V
FB-OKF
V
FB
falling 90.5 92 94.6
%V
FB-
REG
FB Threshold for RESET
Deassertion
V
FB-OKR
V
FB
rising 93.8 95 97.8
%V
FB-
REG
RESET Deassertion Delay After FB
Reaches95%Regulation
1024 Cycles
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Temperature rising 165 ºC
Thermal-ShutdownHysteresis 10 ºC