MAX15108 Datasheet, PDF (8/19 Pages) Maxim Integrated Products – High-Efficiency, 8A, Current-Mode Synchronous Step-Down Switching Regulator

High-Efficiency, 8A, Current-Mode
Synchronous Step-Down Switching Regulator
Pin Configuration
BUMP VIEW
MAX15108
5
4
3
2
1
PGND PGOOD
LX
LX
PGND A
FB
I.C.
IN
LX
PGND B
SS
SKIP
IN
LX
PGND C
COMP
EN
IN
INX
PGND D
WLP
BUMP
A1, A5, B1,
C1, D1
A2, A3,
B2, C2
A4
B3, C3, D3
B4
B5
C4
C5
D2
D4
D5
NAME
PGND
LX
PGOOD
IN
I.C.
FB
SKIP
SS
INX
EN
COMP
Pin Description
FUNCTION
Power Ground. Low-side switch source terminal. Connect PGND and the return terminals of
input and output capacitors to the power ground plane.
Inductor Connection. Connect LX to the switching side of the inductor. LX is high impedance
when the device is in shutdown mode.
Open-Drain Power-Good Output. PGOOD goes low when VFB is below 530mV.
Input Power Supply. Input supply range is 2.7V to 5.5V. Bypass IN with a minimum 10FF ceramic
capacitor to PGND. See the Typical Application Circuit.
Internally Connected. Leave unconnected.
Feedback Input. Connect FB to the center tap of an external resistive voltage-divider from the
output to PGND to set the output voltage from 0.6V to 95% of VIN.
Skip Mode Input. Connect SKIP to EN to select skip mode or leave unconnected for fixed-
frequency PWM operation.
Soft-Start. Connect a capacitor from SS to PGND to set the startup time. See the Soft-Start
section for details on setting the soft-start time. SS is also an external reference input. Apply an
external voltage reference from 0V to VIN - 1.5V to drive soft-start externally.
Internally Unconnected. INX is not internally connected to IN. However, do externally connect
INX to IN to increase the area of the power plane for optimal heat dissipation.
Enable Input. EN is a digital input that turns the regulator on and off. Drive EN high to turn on the
regulator. Connect to IN for always-on operation.
Error Amplifier Output. Connect compensation network from COMP to signal ground (SGND).
See the Compensation Design Guidelines section.
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