LM3489_14 datasheet(7/23 Pages) TI1

部件名	LM3489

功能描述	Hysteretic PFET Buck Controller with Enable Pin

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制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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7 / 23 page

VOUT RIPPLE

(50 mVac/Div)

Switch Node Voltage, VD1 (10V/Div)

IL (1A/Div)

TIME (2 Ps/DIV)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

OUTPUT CURRENT (A)

40

50

60

70

80

90

100

L = 22 PH

R1 = 60.7k

R2 = 20k

VIN = 24V

VIN = 12V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

OUTPUT CURRENT (A)

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

VIN = 24V

VIN = 12V

L = 22 PH

R1 = 60.7k

R2 = 20k

0.0

0.2

0.4

0.6

0.8

1.0

1.2

OUTPUT CURRENT (A)

40

50

60

70

80

90

100

VIN = 4.5V

VIN = 24V

VIN = 12V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

OUTPUT CURRENT (A)

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

VIN = 4.5V

VIN = 24V

VIN = 12V

LM3489

www.ti.com

SNVS443A – MAY 2006 – REVISED JUNE 2008

Typical Performance Characteristics (continued)

All curves taken at VIN = 12V with configuration in typical application circuit shown in Application Information section of this

datasheet. TJ = 25°C, unless otherwise specified.

Efficiency

VOUT Regulation

vs

Load Current

(VOUT = 3.3V, L = 22µH)

Efficiency

VOUT Regulation

vs

Load Current

(VOUT = 5V, L = 22µH)

Power Up

Continuous Mode Operation

(No Load, CADJ = 1nF)

(VIN = 12V, VOUT = 3.3 V, IOUT = 500mA)

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