FAN5033 datasheet(4/39 Pages) FAIRCHILD

Part #	FAN5033

Description	8-Bit Programmable, 2- to 3-Phase, Synchronous Buck Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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FAN5033 Rev. 1.0.0

4 of 39

Pin #

Name

Description

14

GND

Ground. All internal biasing and logic output signals of the device are referenced to this

ground.

15

OD

Output Disable. This pin is actively pulled low when the EN input is low or when VCC is

below its UVLO threshold to disable the external MOSFET drivers. (Also referred to as

OD# in the text of this document.)

16

NC

No Connection. This pin is not connected internally.

17 to 19

SW3 to

SW1

Switching Node Current Balance Inputs. Sense the switching side of the inductor and

used to measure the current level in each phase. The SW pins of unused phases should

be left open.

20 to 22

PWM3 to

PWM1

PWM Outputs. Each output is connected to the input of an external MOSFET driver,

such as the FAN5109. Connecting the PWM3 output to VCC disables that phase,

allowing the FAN5033 to operate as a two-phase controller.

23

VCC

Supply Voltage for the Device.

24 to 31

VID7 to

VID0

Voltage Identification Code Inputs. These digital inputs are connected to the internal

DAC and used to program the output voltage. These pins have 1µA internal pull-down;

so if they are left open, the input state is decoded as logic low.

32

VIDSEL

VID Table Select Input. A logic low selects the extended VR10 DAC table and a logic

high selects the VR11 DAC table. This pin has a 1µA internal pull-down; so if left open,

the input state is decoded as logic low.

-

Exposed

Paddle

Internally connected to die ground. May be connected to ground or left floating.

Connect to ground for lowest package thermal resistance.

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