MAX15112 Datasheet, PDF (10/23 Pages) Maxim Integrated Products – High-Efficiency, 12A, Current-Mode Synchronous Step-Down Regulator with Integrated Switches

MAX15112
High-Efficiency, 12A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
Pin Configuration
TOP VIEW
(BUMP ON THE BOTTOM)
+
GND
LX
A1
A2
MAX15112
LX
BST PGOOD GSNS
A3
A4
A5
A6
GND
LX
LX
IN
N.C.
FB
B1
B2
B3
B4
B5
B6
GND
LX
LX
IN
SKIP SS/REFIN
C1
C2
C3
C4
C5
C6
GND GND
AIN
IN
EN
COMP
D1
D2
D3
D4
D5
D6
WLP
Pin Description
PIN
A1, B1, C1,
D1, D2
A2, A3, B2,
B3, C2, C3
A4
A5
A6
B4, C4, D4
B5
B6
C5
C6
D3
D5
D6
NAME
GND
LX
BST
PGOOD
GSNS
IN
N.C
FB
SKIP
SS/REFIN
AIN
EN
COMP
FUNCTION
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
capacitor return terminal.
Inductor Connection. Connect LX to the switching side of the inductor. LX is high impedance when
the MAX15112 is in shutdown mode.
Boost Input for the High-Side Switch Driver. Connect a capacitor from BST to LX.
Power-Good Open-Drain Output. PGOOD asserts high when V_FB is above 0.554V (typ) and
deasserts when V_FB falls below 0.529V (typ).
Remote Ground-Sense Input. Connect GSNS to the ground terminal of the load and to the bottom of
the feedback resistors.
Input Power Supply. Bypass IN to GND with at least two 22FF low-ESR ceramic capacitors with suf-
ficient ripple current ratings.
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
externally control the soft-start time and feedback voltage.
Filtered Input Voltage
Enable Input. Drive EN high to enable the MAX15112. 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.
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