LM2678S-3.3 datasheet(6/36 Pages) TI1

No. de pieza	LM2678S-3.3

Descripción Electrónicos	LM2678 SIMPLE SWITCHER짰 High Efficiency 5-A Step-Down Voltage Regulator

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6

LM2678

SNVS029J – MARCH 2000 – REVISED JULY 2016

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Product Folder Links: LM2678

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(1)

All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are specified

through correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level

(AOQL).

(2)

Typical values are determined with TA = TJ = 25°C and represent the most likely norm.

6.7 Electrical Characteristics – 12 V

Specifications apply for TA = TJ = 25°C and RADJ = 5.6 kΩ (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN(1)

TYP(2)

MAX(1)

UNIT

VOUT

Output voltage

VIN = 15 V to 40 V,

100 mA

≤ IOUT ≤ 5 A

TJ = 25°C

11.76

12

12.24

V

TJ = –40°C to 125°C

11.64

12.36

η

Efficiency

VIN = 24 V, ILOAD = 5 A

92%

(1)

All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are specified

through correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level

(AOQL).

(2)

Typical values are determined with TA = TJ = 25°C and represent the most likely norm.

6.8 Electrical Characteristics – Adjustable

Specifications apply for TA = TJ = 25°C and RADJ = 5.6 kΩ (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN(1)

TYP(2)

MAX(1)

UNIT

VFB

Feedback voltage

VIN = 8 V to 40 V,

100 mA

≤ IOUT ≤ 5 A

VOUT programmed for 5 V

TJ = 25°C

1.186

1.21

1.234

V

TJ = –40°C to 125°C

1.174

1.246

η

Efficiency

VIN = 12 V, ILOAD = 5 A

84%

(1)

The peak switch current limit is determined by the following relationship: ICL = 37,125 / RADJ

6.9 Electrical Characteristics – All Output Voltage Versions

Specifications are for TA = TJ = 25°C, VIN = 12 V for the 3.3-V, 5-V, and adjustable versions, and VIN = 24 V for the 12-V

version (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IQ

Quiescent current

VFEEDBACK = 8 V for 3.3-V, 5-V, and adjustable versions,

VFEEDBACK = 15 V for 12-V version

4.2

6

mA

ISTBY

Standby quiescent current

ON/OFF pin = 0 V

TJ = 25°C

50

100

µA

TJ = –40°C to 125°C

150

ICL

Current limit

RADJ = 5.6 kΩ

(1)

TJ = 25°C

5.5

6.3

7.6

A

TJ = –40°C to 125°C

5.3

8.1

IL

Output leakage current

VIN = 40 V, soft-start pin = 0 V

VSWITCH = 0 V

1

1.5

mA

VSWITCH = –1 V

6

15

RDS(ON)

Switch ON-Resistance

ISWITCH = 5 A

TJ = 25°C

0.12

0.14

Ω

TJ = –40°C to 125°C

0.225

fO

Oscillator frequency

Measured at switch pin

TJ = 25°C

260

kHz

TJ = –40°C to 125°C

225

280

D

Duty cycle

Maximum duty cycle

91%

Minimum duty cycle

0%

IBIAS

Feedback bias

current

VFEEDBACK = 1.3 V (adjustable version only)

85

nA

VON/OFF

ON/OFF threshold voltage

TJ = 25°C

1.4

V

TJ = –40°C to 125°C

0.8

2

ION/OFF

ON/OFF input current

ON/OFF input = 0 V

TJ = 25°C

20

μA

TJ = –40°C to 125°C

45

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