Datasheet

MAX8655
Highly Integrated, 25A, Wide-Input,
Internal MOSFET, Step-Down Regulator
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Pin Description (continued)
PIN NAME FUNCTION
40 ILIM2
Programmable Current-Limit Input. Connect a resistor from ILIM2 to GND to set the valley current
limit. See the Setting the Current Limit section.
41 SCOMP
Programmable Slope-Compensation Input. Internal slope-compensation voltage rate is the voltage at
SCOMP times 0.1 divided by the oscillator period (T). Connect SCOMP to AVL or GND to set to the
default of 250mV/T or 125mV/T, respectively.
43 POK
Open-Drain Power-OK Output. POK goes high impedance when the output voltage rises above 91%
of the nominal regulation voltage. POK pulls low during shutdown or when the output drops below
88% of the nominal regulation voltage.
44 FSYNC
Frequency Set and Synchronization Input. Connect a resistor from FSYNC to GND to set the switching
frequency, or drive with a clock signal to synchronize between 160kHz and 1.2MHz. See the
Switching Frequency and Synchronization section.
45 MODE
Current-Limit Operating Mode Selection. Connect MODE to AVL for latch-off current limit or connect
MODE to GND for automatic recovery current limit.
46 SYNCO
Synchronization Output. Provides a clock output for synchronizing another MAX8655 with 180°
out-of-phase operation.
47 BST Boost Capacitor Connection. Connect a 0.22µF ceramic capacitor from BST to LXB.
50 LXB LX Boost Capacitor Connection. Connect a 0.22µF ceramic capacitor between LXB and BST.
— GND-EP Exposed Pad. Connect to GND externally. See the Pin Configuration.
— PVIN-EP Exposed Pad. Internally connected to PVIN. See the Pin Configuration.
— LX-EP Exposed Pad. Internally connected to LX. See the Pin Configuration.