MAX15118 Datasheet, PDF (10/23 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
Pin Configuration
TOP VIEW
(BUMP ON THE BOTTOM)
MAX15118
+
BST
LX
LX
LX
IN PGOOD GSNS
A1
A2
A3
A4
A5
A6
A7
GND
LX
GND
LX
B1
B2
B3
B4
IN
N.C.
FB
B5
B6
B7
GND
LX
GND
LX
C1
C2
C3
C4
IN
SKIP SS/REFIN
C5
C6
C7
GND GND GND
AIN
IN
EN COMP
D1
D2
D3
D4
D5
D6
D7
WLP
Pin Description
PIN
A1
A2, A3, A4,
B2, B4, C2,
C4
A5, B5, C5,
D5
A6
A7
B1, B3,
C1, C3,
D1, D2, D3
B6
B7
C6
C7
D4
D6
D7
NAME
BST
LX
IN
PGOOD
GSNS
GND
N.C.
FB
SKIP
SS/REFIN
AIN
EN
COMP
FUNCTION
Boost Input for the High-Side Switch Driver. Connect a capacitor from BST to LX.
Inductor Connection. Connect LX to the switching side of the inductor. LX is high impedance when
the MAX15118 is in shutdown mode.
Input Power Supply. Bypass IN to GND with at least two 22FF low-ESR ceramic capacitors with suf-
ficient ripple current ratings.
Power-Good Open-Drain Output. PGOOD asserts high when V_FB is above 0.555V (typ) and
deasserts when V_FB falls below 0.530V (typ).
Remote Ground-Sense Input. Connect GSNS to the ground terminal of the load and to the bottom of
the feedback resistors.
Ground Connection. GND is the source terminal of the internal low-side switch. Connect all GND
bumps to a component-side PCB copper ground plane at a single point near the input bypass capac-
itor return terminal.
No Connection. Do not connect.
Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to the
output capacitor return terminal to set the output voltage from 0.6V to 0.94 x V_IN.
Skip Mode Selector Input. Connect SKIP to EN for skip mode operation. Connect SKIP to GND
or leave unconnected for continuous mode operation. Do not change the state of SKIP when EN is high.
Soft-Start and External Voltage Reference Input. Connect a capacitor from SS/REFIN to GND to set
the soft-start delay. See the Setting the Soft-Start Time section for more information. To use SS/REFIN
as an external voltage reference, apply a voltage ranging from 0V to (V_IN - 2.5V) to SS/REFIN to exter-
nally control the soft-start time and feedback voltage.
Filtered Input Voltage
Enable Input. Drive EN high to enable the MAX15118. Connect EN to IN for always-on operation.
Error Amplifier Output. Connect the compensation network from COMP to GND. See the
Compensation Design Guidelines section for more information.
���������������������������������������������������������������� Maxim Integrated Products   10