LM2574HVM-ADJ datasheet(5/38 Pages) TI1

部件名	LM2574HVM-ADJ

功能描述	SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator

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制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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5 / 38 page

5

LM2574, LM2574HV

www.ti.com

SNVS104D – JUNE 1999 – REVISED APRIL 2016

Product Folder Links: LM2574 LM2574HV

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(1)

All limits specified at room temperature TYP and MAX. All room temperature limits are 100% production tested. All limits at temperature

extremes are specified through correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate

Average Outgoing Quality Level.

(2)

The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated

output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power

dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2% (see Figure 6).

(3)

Output pin sourcing current. No diode, inductor or capacitor connected to output pin.

(4)

Feedback pin removed from output and connected to 0 V.

(5)

Feedback pin removed from output and connected to 12 V for the adjustable, 3.3-V, and 5-V versions, and 25 V for the 12-V and 15-V

versions, to force the output transistor OFF.

(6)

VIN = 40 V (60 V for high voltage version).

6.5 Electrical Characteristics for All Output Voltage Versions

TJ = 25°C, and MIN and MAX apply over full operating temperature range. VIN = 12 V for the 3.3-V, 5-V, and adjustable

version, VIN = 25 V for the 12-V version, and VIN = 30 V for the 15-V version, ILOAD = 100 mA (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN(1)

TYP

MAX(1)

UNIT

Ib

Feedback bias current

Adjustable version

only, VOUT = 5 V

TJ = 25°C

50

100

nA

–40°C < TJ < 125°C

500

fO

Oscillator frequency

See(2)

TJ = 25°C

47

52

58

kHz

–40°C < TJ < 125°C

42

63

VSAT

Saturation voltage

IOUT = 0.5 A

(3)

TJ = 25°C

0.9

1.2

V

–40°C < TJ < 125°C

1.4

DC

Maximum duty cycle (ON)

See(4)

93%

98%

ICL

Current limit

Peak current(3)(2)

0.7

1

1.6

A

0.65

1.8

IL

Current output leakage

Output = 0 V

2

mA

Output = –1 V(5)(6)

7.5

30

IQ

Quiescent current

See(5)

5

10

mA

ISTBY

Standby quiescent current

ON/OFF pin = 5 V (OFF)

50

200

μA

ON/OFF CONTROL (SEE Figure 27)

VIH

ON/OFF pin logic input level

VOUT = 0 V

TJ = 25°C

2.2

1.4

V

–40°C < TJ < 125°C

2.4

VIL

VOUT = Nominal output

voltage

TJ = 25°C

1.2

1

V

–40°C < TJ < 125°C

0.8

IH

ON/OFF pin input current

ON/OFF pin = 5 V (OFF)

12

30

μA

IIL

ON/OFF pin = 0 V (ON)

0

10

μA

(1)

Test Circuit in Figure 22 and Figure 27.

(2)

All limits specified at room temperature and at temperature extremes . All room temperature limits are 100% production tested. All limits

at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to

calculate Average Outgoing Quality Level.

6.6 Electrical Characteristics – 3.3-V Version

TJ = 25°C, and all MIN and MAX apply over full operating temperature range (unless otherwise noted).

PARAMETER(1)

TEST CONDITIONS

MIN(2)

TYP

MAX(2)

UNIT

VOUT

Output voltage

VIN = 12 V, ILOAD = 100 mA

3.234

3.3

3.366

V

LM2574, 4.75 V

≤ VIN ≤ 40 V,

0.1 A

≤ ILOAD ≤ 0.5 A

TJ = 25°C

3.168

3.3

3.432

−40°C ≤ TJ ≤ 125°C

3.135

3.465

LM2574HV, 4.75 V

≤ VIN ≤ 60 V,

0.1 A

≤ ILOAD ≤ 0.5 A

TJ = 25°C

3.168

3.3

3.45

−40°C ≤ TJ ≤ 125°C

3.135

3.482

η

Efficiency

VIN = 12 V, ILOAD = 0.5 A

72%

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