FAN50FC3MPX datasheet(8/21 Pages) FAIRCHILD

No de pièce	FAN50FC3MPX

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

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Fabricant	FAIRCHILD [Fairchild Semiconductor]

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FAN50FC3 Rev. 1.0.0

8 of 21

Electrical Characteristics (Continued)

VCC = 12V, FBRTN = GND, and TA = +25°C. The • denotes specifications which apply over the full operating

temperature range.

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

Power-Good Comparator (Continued)

VCROWBAR

Crowbar Trip Point

Relative to Nominal DAC Output

• 100

150

200

mV

VCR_RST

Crowbar Reset Point

Relative to FBRTN

• 250

300

350

mV

t1CROWBAR

Crowbar Delay Time 1

VID Code Change

Over-Voltage to PWM Going LOW

Crowbar Blanking Time

• 100

250

µs

t2CROWBAR

Crowbar Delay Time 2

VID Code Static

Over-Voltage to PWM going LOW

Crowbar Blanking Time

•

400

ns

PWM Outputs

VOL(VRTM)

Output Voltage Low

IPWM(SINK) = 400µA

•

160

400

mV

VOH(VRTM)

Output Voltage High

IPWM(SOURCE) = 400µA

•

4

5

V

VDIS

Phase Disable Voltage

Applicable to PWM3 pins only.

Connect this pin to VCC to disable

the phase.

(4)

• VCC -.1

V

Input Supply

IDC

DC Supply Current

EN = Logic HIGH

•

8

12

mA

VUVLO

UVLO Threshold

VCC Rising

•

6.5

6.9

7.3

V

VUVLO_HYS

UVLO Hysteresis

•

0.7

0.9

1.1

V

Notes:

2.

Limits at operating temperature extremes are guaranteed by design, characterization, and statistical quality control.

3.

AC specifications are guaranteed by design and characterization; not production tested.

4.

To operate the FAN50FC3 with fewer than three phases, PWM3 should be connected to VCC to disable this

phase. See the Theory of Operation section for details.

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ON Semiconductor	ADP3193A	577Kb / 29P	8-Bit, Programmable, 2- to 3-Phase, Synchronous Buck Controller February 2008 ??Rev. 1
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