LM25141-Q1 datasheet(8/50 Pages) TI1

部品番号	LM25141-Q1

部品情報	Wide Input Range Synchronous Buck Controller

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LM25141

SNVSAU1 – MARCH 2017

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Electrical Characteristics (continued)

TJ = –40°C to +125°C, Typical values TJ = 25°C, VIN = 12 V, VCCX = 5 V, VOUT = 5 V, EN = 5 V, OSC = VDD, FSW = 2.2

MHz, no-load on the Drive Outputs (HO, HOL, LO, and LOL outputs), over operating free-air temperature range (unless

otherwise noted)

(1)(2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ENABLE INPUT

VIL

Enable input low threshold

VCCX = 0 V

0.8

V

VIH

Enable input high threshold

VCCX = 0 V

2.0

V

IIkg

Leakage

EN logic input only

1

µA

SYN INPUT (DEMB pin)

VIL

DEMB input low threshold

0.8

V

VIH

DEMB input high threshold

2.0

V

DEMB input low frequency range

440 kHz

350

550

kHz

DEMB input high frequency range

2.2 MHz

1800

2600

kHz

DITHER

IDITHER

Dither source/sink current

20

µA

VDITHER

Dither high threshold

1.26

V

Dither low threshold

1.14

V

SOFT-START

ISS

Soft-Start current

16

22

28

µA

RDS(ON)

Soft-Start pull-down resistance

3

Ω

THERMAL

TSD Thermal Shutdown

175

ºC

Thermal shutdown hysteresis

15

ºC

6.6 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Oscillator Frequency 2.2 MHz

OSC = VDDA, VIN = 8–18 V

2100

2200

2300

kHz

Oscillator Frequency 440 kHz

OSC = GND, VIN = 8–18 V

420

440

460

kHz

RT

Adjustment

Range

Minimum

OSC = VDD, RTMIN = 61.9 kΩ

1710

1800

1890

kHz

Typical

OSC = VDD, RTTYP = 49.9 kΩ

2100

2200

2300

kHz

2.2 MHz

Maximum

OSC = VDD, RTMAX = 43.2 kΩ

2405

2530

2655

kHz

RT

Adjustment

Range

Minimum

OSC = GND, RTMIN = 73.2 k

285

300

315

kHz

Typical

OSC = GND, RTTYP = 49.9 kΩ

420

440

460

kHz

440 kHz

Maximum

OSC = GND, RTMAX = 44.2 kΩ

475

500

525

kHz

RT

Response

time

RT= 61.9–43.2 k

Ω

2

µs

RT

Response

time

RT = 43.2–61.9 k

Ω

3.5

µs

RT

Response

time

16

µs

ton

Minimum on-time

45

66

ns

toff

Minimum off-time

100

ns

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