LM22671QMRX-5.0 datasheet(4/25 Pages) TI

部件名	LM22671QMRX-5.0

功能描述	LM22671/LM22671-Q1 42V, 500mA SIMPLE SWITCHER짰 Step-Down Voltage Regulator

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制造商	TI [Texas Instruments]

网页	http://www.ti.com

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LM22671

SNVS589M – SEPTEMBER 2008 – REVISED APRIL 2013

www.ti.com

Electrical Characteristics

Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +125°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TA = TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified:

VIN = 12V.

Symbol

Parameter

Conditions

Min(1)

Typ(2)

Max(1)

Units

LM22671-5.0

VFB

Feedback Voltage

VIN = 8V to 42V

4.925/4.9

5.0

5.075/5.1

V

LM22671-ADJ

VFB

Feedback Voltage

VIN = 4.7V to 42V

1.266/1.259

1.285

1.304/1.311

V

All Output Voltage Versions

IQ

Quiescent Current

VFB = 5V

3.4

6

mA

ISTDBY

Standby Quiescent Current

EN Pin = 0V

25

40

µA

ICL

Current Limit

0.62/0.56

0.7

0.84/0.9

A

IL

Output Leakage Current

VIN = 42V, EN Pin = 0V, VSW = 0V

0.2

2

µA

VSW = -1V

0.1

3

µA

RDS(ON)

Switch On-Resistance

0.2

0.24/0.32

Ω

fO

Oscillator Frequency

400

500

600

kHz

TOFFMIN

Minimum Off-time

100

200

300

ns

TONMIN

Minimum On-time

100

ns

IBIAS

Feedback Bias Current

VFB = 1.3V (ADJ Version Only)

230

nA

VEN

Enable Threshold Voltage

Falling

1.3

1.6

1.9

V

VENHYST

Enable Voltage Hysteresis

0.6

V

IEN

Enable Input Current

EN Input = 0V

6

µA

FSYNC

Maximum Synchronization

VSYNC = 3.5V, 50% duty-cycle

1

MHz

Frequency

VSYNC

Synchronization Threshold

1.75

V

Voltage

ISS

Soft-Start Current

30

50

70

µA

TSD

Thermal Shutdown Threshold

150

°C

θJA

Thermal Resistance

MR package, Junction to ambient

60

°C/W

thermal resistance(3)

(1)

Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation

using Statistical Quality Control (SQC) methods. Limits are used to calculate TI's Average Outgoing Quality Level (AOQL).

(2)

Typical values represent most likely parametric norms at the conditions specified and are not ensured.

(3)

The value of

θJA for the SO PowerPAD exposed pad (MR) package of 60°C/W is valid if package is mounted to 1 square inch of copper.

The

θJA value can range from 42 to 115°C/W depending on the amount of PCB copper dedicated to heat transfer.

4

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