FAN5033 datasheet(7/39 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

7 of 39

Electrical Characteristics (Continued)

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

temperature range.

Symbol

Parameter

Conditions

Min.

Typ. Max.

Unit

Current Sense Amplifier

VOS(CSA)

Offset Voltage

CSSUM – CSREF

Figure 4

•

-1.0

+1.0

mV

IBIAS(CSSUM)

Input Bias Current (for CSSUM)

•

-50

+50

nA

IBIAS(CSREF)

Input Current (for CSREF)

Current drawn by

CSREF Pin

•

-3

+3

µA

GBW(CSA)

Gain Bandwidth Product

CSSUM = CSCOMP

(2)

10

MHz

Slew Rate

CCSCOMP = 10pF

(2)

10

V/µs

VCSACM

Input Common-Mode Range

CSSUM and CSREF

•

0

3.2

V

Output Voltage Range

•

0.05

3.2

V

ICSCOMP

Output Current

1

mA

tOC(DELAY)

Current Limit Latch-off Delay Time

CDELAY = 10nF

5

ms

Current Balance Circuit

VSW(x)CM

Common Mode Range

(2)

•

-600

+200

mV

RSW(x)

Input Resistance

SW(x) = 0V

•

35

50

65

k

Ω

ISW(x)

Input Current

SW(x) = 0V

•

1.6

3.3

5.0

µA

ΔISW(x)

Input Current Matching

SW(x) = 0V

•

-5

+5

%

Current Limit Comparator

VILIMIT

Output Voltage

RILIMT = 143kΩ

•

1.6

1.7

1.8

V

IILIMIT

Output Current

RILIMT = 143kΩ

12

µA

Maximum Output Current

•

60

µA

VCL

Current Limit Threshold Voltage

VCSREF − VCSCOMP, RILIMT

= 143k

Ω

•

100

120

140

mV

Current Limit Setting Ratio

VCL / IILIMT

10

mV/µA

Delay Timer

IDELAY

Normal Mode Output Current

•

12

15

18

µA

IDELAY(CL)

Output Current in Current Limit

•

3.0

3.75

4.5

µA

VDELAY(TH)

Threshold Voltage

•

1.6

1.7

1.8

V

Soft-Start

I(SS)

Output Current

During Start-up

•

12

15

18

µA

Enable Input

VTH(EN)

Threshold Voltage

•

800

850

900

mV

VHYS(EN)

Threshold Hysteresis

•

80

100

120

mV

IIN(EN)

Enable Input Current

1

µA

tDELAY(EN)

Turn-on Delay

Start-up sequence,

EN>950mV, CDELAY =

10nF

2

ms

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