MAX15109 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 with VID Control
Pin Configuration
BOTTOM VIEW
MAX15109
5
4
3
2
1
VID0 PGOOD
LX
LX
PGND A
FB
I.C.
IN
LX
PGND B
SS
VID1
IN
LX
PGND C
COMP
EN
IN
INX
PGND D
WLP
BUMP
A1, B1,
C1, D1
A2, A3,
B2, C2
A4
A5
B3, C3, D3
B4
B5
C4
C5
D2
D4
D5
NAME
PGND
LX
PGOOD
VID0
IN
I.C.
FB
VID1
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 the PGOOD threshold.
VID0 Logic Input. Use VID0 and VID1 to select output voltage.
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 sense the output voltage.
VID1 Logic Input. Use VID0 and VID1 to select output voltage.
Soft-Start and VID Transition Timing Control. Connect a capacitor from SS to PGND to set the
startup time and the output voltage transition timing. See the Output Voltage Transition Timing
section for details.
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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