LM2731 datasheet(4/22 Pages) TI1

No de pièce	LM2731

Description	0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23

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Fabricant	TI1 [Texas Instruments]

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LM2731

SNVS217E – MAY 2004 – REVISED APRIL 2010

www.ti.com

Electrical Characteristics

Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range

(

−40°C ≤ TJ ≤ +125°C). Unless otherwise specified: VIN = 5V, VSHDN = 5V, IL = 0A.

Min

Typical

Max

Symbol

Parameter

Conditions

Units

(1)

(2)

(1)

VIN

Input Voltage

2.7

14

V

VOUT (MIN)

Minimum Output Voltage

RL = 43Ω

VIN = 2.7V

5.4

7

V

Under Load

X Option

VIN = 3.3V

8

10

(3)

VIN = 5V

13

17

RL = 43Ω

VIN = 2.7V

8.25

10

Y Option

VIN = 3.3V

10.5

12

(3)

VIN = 5V

14

16

RL = 15Ω

VIN = 2.7V

3.75

5

X Option

VIN = 3.3V

5

6.5

(3)

VIN = 5V

8.75

11

RL = 15Ω

VIN = 2.7V

5

6

Y Option

VIN = 3.3V

5.5

7.5

(3)

VIN = 5V

9

11

ISW

Switch Current Limit

(4)

1.8

2

A

1.4

RDS(ON)

Switch ON Resistance

ISW = 100 mA

260

400

m

Ω

Vin = 5V

500

ISW = 100 mA

300

450

Vin = 3.3V

550

SHDNTH

Shutdown Threshold

Device ON

1.5

V

Device OFF

0.50

ISHDN

Shutdown Pin Bias Current VSHDN = 0

0

µA

VSHDN = 5V

0

2

VFB

Feedback Pin Reference

VIN = 3V

1.205

1.230

1.255

V

Voltage

IFB

Feedback Pin Bias Current

VFB = 1.23V

60

500

nA

IQ

Quiescent Current

VSHDN = 5V, Switching "X"

2

3.0

mA

VSHDN = 5V, Switching "Y"

1.0

2

VSHDN = 5V, Not Switching

400

500

µA

VSHDN = 0

0.024

1

FB Voltage Line

2.7V

≤ VIN ≤ 14V

0.02

%/V

Regulation

(1)

FSW

Switching Frequency

“X” Option

1

1.6

1.85

MHz

(5)

“Y” Option

0.40

0.60

0.8

DMAX

Maximum Duty Cycle

“X” Option

86

93

%

(5)

“Y” Option

92

96

IL

Switch Leakage

Not Switching VSW = 5V

1

µA

(1)

Limits are guaranteed by testing, statistical correlation, or design.

(2)

Typical values are derived from the mean value of a large quantity of samples tested during characterization and represent the most

likely expected value of the parameter at room temperature.

(3)

L = 10 µH, COUT = 4.7 µF, duty cycle = maximum

(4)

Switch current limit is dependent on duty cycle (see Typical Performance Characteristics).

(5)

Guaranteed limits are the same for Vin = 3.3V input.

4

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