MAX15118 Datasheet, PDF (3/23 Pages) Maxim Integrated Products – High-Efficiency, 18A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches

MAX15118
High-Efficiency, 18A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
DC ELECTRICAL CHARACTERISTICS (continued)
(V_IN = 5V, see the Typical Operating Circuits, T_A = -40NC to +85NC. Typical values are at T_A = +25NC, unless otherwise noted.) (Note 4)
PARAMETER
GROUND SENSE
SYMBOL
CONDITIONS
MIN
TYP MAX UNITS
GSNS Output Current
POWER SWITCHES
Current-Limit Threshold
V_SS/REFIN = 0.6V, V_GSNS = 0V
High-side switch
Low-side switch, sinking
Low-side switch, sourcing
56
FA
30
30
A
30
LX Leakage Current
BST Leakage Current
BST On-Resistance
LX RMS Output Current
OSCILLATOR
R_{ON_BST}
V_EN = 0V
V_EN = 0V
I_BST = 50mA
3
FA
3
FA
0.63
I
18
A
Switching Frequency
Maximum Duty Cycle
f_SW
D_MAX
PWM mode
Skip mode
850
1000 1150
kHz
94
%
85
Minimum Controllable On-Time
t_ON
ENABLE FUNCTIONALITY
70
ns
EN Input High Threshold
V_IH
V_EN rising
EN Input Low Threshold
V_IL
V_EN falling
EN Input Leakage Current
SKIP FUNCTIONALITY (Note 5)
1.4
V
0.4
V
-1
+1
FA
SKIP Input High Threshold
SKIP Input Low Threshold
SKIP Pulldown Resistor
V_SKIP rising
V_SKIP falling
1.4
V
0.4
V
210
kI
Minimum LX On-Current in Skip
Mode
3.6
A
Zero-Crossing LX Threshold
SOFT-START AND PREBIAS FUNCTIONALITY
0.5
A
Soft-Start Current
SS/REFIN Discharge Resistance
SS/REFIN Prebias Mode Stop
Voltage
I_SS
V_SS/REFIN = 0.45V, sourcing
R_SS
I_SS/REFIN = 10mA, sinking
V_SS/REFIN rising
6.8
10
12.5
FA
7
I
0.58
V
SS/REFIN External Reference
Input Range
V_IN -
2.5
V
HICCUP MODE
Number of Consecutive Current-
Limit Events to Hiccup Mode
N_HIC
8
Events
Hiccup Mode Timeout
1024
Clock
Cycles
����������������������������������������������������������������� Maxim Integrated Products   3