FAN5902 Fairchild Semiconductor, FAN5902 Datasheet - Page 3

• Manufacturer Part Number: FAN5902
• Description: The FAN5902 is a high-efficiency, low-noise, synchronous, step-down DC-to-DC converter designed for powering the radio frequency power amplifiers (RFPA) in 3G mobile handsets and other mobile applications
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN5902 • Rev. 1.0.2.short
Pin Configurations
Pin Definitions
(*) Pinout available upon request
Pin #
MLP
(*)
WLCSP
Pin #
(*)
Figure 3.
(Top View)
VOUTSNS
Name
AGND
VCON
AGND
PGND
BPEN
SYNC
AVIN
PVIN
SW
12-Lead MLP
EN
Analog ground, reference ground for the IC. Follow PCB routing notes for
connecting this pin.
Output voltage sense pin. Connect to V
regulation.
Enables switcher when HIGH, shutdown mode when LOW. This pin should not
be left floating.
Analog control input from an external D-to-A converter.
Analog bias supply voltage input. Connect to PVIN.
Connect to analog ground.
Force bypass transistor when HIGH; auto-bypass when LOW. This pin should
not be left floating
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.
Power ground of the internal MOSFET switches. Follow routing notes for
connections between PGND and AGND.
Switching node of the internal MOSFET switches. Connect to output inductor.
Supply voltage input to the internal MOSFET switches. Connect to input power
source.
3
Description
Figure 4.
OUT
to establish feedback path for
(Top View)
12-Bump WLCSP
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