Datasheet
9Maxim Integrated
High-Efficiency, 4A, Step-Down DC-DC
Regulators with Internal Power Switches
MAX15066/MAX15166
Pin Description
Pin Configuration
BUMP NAME FUNCTION
A1, A2 GND Ground. Connect A1 and A2 together as close as possible to the device.
A3, A4 IN
Power-Supply Input. Input supply range is from 4.5V to 16V. Connect A3 and A4 together as close as
possible to the device. Bypass IN to GND with a minimum 22FF ceramic capacitor as close as
possible to the device.
B1, B2, B3 LX
Inductor Connection. Connect an inductor between LX and the regulator output. LX is high
impedance when the device is in shutdown mode. Connect all LX nodes together as close as possible
to the device.
B4 V
DD
Internal 5V LDO Output. V
DD
powers the internal analog core. Connect a minimum of 1FF ceramic
capacitor from V
DD
to GND.
C1 BST
High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.01FF capacitor. BST is internally
connected to the V
DD
regulator through a pMOS switch.
C2, C3 I.C. Internal Connection. Leave unconnected.
C4 EN
Enable Input. Connect EN to GND to disable the device. Set EN to above 1.9V (typ) to enable the
device. EN can be shorted to IN for always-on operation.
D1 PGOOD
Power-Good Output. PGOOD is an open-drain output that goes high impedance when V
FB
exceeds
0.56V (typ). PGOOD is internally pulled low when V
FB
falls below 0.545V (typ). PGOOD is internally
pulled low when the device is in shutdown mode, V
DD
is below the UVLO threshold, or the device is in
thermal shutdown.
D2 FB
Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to GND to
set the output voltage from 0.606V to 90% of V
IN
.
D3 COMP
Voltage-Error Amplifier Output. Connect the necessary compensation network from COMP to GND
(see the Compensation Design section).
D4 SS
Soft-Start Timing Capacitor Connection. Connect a capacitor from SS to GND to set the startup time
(see the Setting the Soft-Start Time section).
WLP
+
TOP VIEW
(BUMPS ON BOTTOM)
I.C.BST
PGOOD
I.C.
LX LX LX
GND INGND
A1
B1
C1
D1
C2 C3
FB COMP
D2 D3
B2 B3
A3
EN
V
DD
IN
C4
SS
D4
B4
A4A2