High-Efficiency, 8A, Current-Mode Synchronous

Step-Down Switching Regulator with VID Control

8 ______________________________________________________________________________________

Pin Description

Pin Configuration

BUMP

NAME

FUNCTION

A1, B1,

C1, D1

PGND

Power Ground. Low-side switch source terminal. Connect PGND and the return terminals of

input and output capacitors to the power ground plane.

A2, A3,

B2, C2

LX

Inductor Connection. Connect LX to the switching side of the inductor. LX is high impedance

when the device is in shutdown mode.

A4

PGOOD

A5

VID0

VID0 Logic Input. Use VID0 and VID1 to select output voltage.

B3, C3, D3

IN

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.

B4

I.C.

Internally Connected. Leave unconnected.

B5

FB

Feedback Input. Connect FB to the sense the output voltage.

C4

VID1

VID1 Logic Input. Use VID0 and VID1 to select output voltage.

C5

SS

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.

D2

INX

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.

D4

EN

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.

D5

COMP

Error Amplifier Output. Connect compensation network from COMP to signal ground (SGND).

See the Compensation Design Guidelines section.

WLP

BOTTOM VIEW

5

4

3

2

1

B

C

D

A

MAX15109

VID0

PGOOD

LX

LX

PGND

FB

I.C.

IN

LX

PGND

SS

VID1

IN

LX

PGND

COMP

EN

IN

INX

PGND