© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5902 • Rev. 1.0.2.short

3

Pin Configurations

Figure 3.

12-Lead MLP

(Top View)

Figure 4.

12-Bump WLCSP

(Top View)

Pin Definitions

MLP

Pin #

WLCSP

Pin #

Name

Description

(*)

(*)

AGND

Analog ground, reference ground for the IC. Follow PCB routing notes for

connecting this pin.

VOUTSNS

regulation.

EN

Enables switcher when HIGH, shutdown mode when LOW. This pin should not

be left floating.

VCON

Analog control input from an external D-to-A converter.

AVIN

Analog bias supply voltage input. Connect to PVIN.

AGND

Connect to analog ground.

BPEN

Force bypass transistor when HIGH; auto-bypass when LOW. This pin should

not be left floating

SYNC

External clock synchronization input and PFM lockout. When SYNC remains

HIGH, the DC-to-DC does not allow PFM mode. Tie SYNC to AGND if not used.

PGND

Power ground of the internal MOSFET switches. Follow routing notes for

connections between PGND and AGND.

SW

Switching node of the internal MOSFET switches. Connect to output inductor.

PVIN

Supply voltage input to the internal MOSFET switches. Connect to input power

source.

(*) Pinout available upon request