LM25005 datasheet(5/21 Pages) NSC

部件名	LM25005

功能描述	42V, 2.5A STEP-DOWN SWITCHING REGULATOR

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制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN to GND

45V

BST to GND

60V

PRE to GND

45V

SW to GND (Steady State)

-1.5V

BST to V

CC

45V

V

CC to GND

14V

BST to SW

14V

OUT to GND

Limited to Vin

SD, SYNC, SS, FB to GND

7V

ESD Rating (Note 2)

Human Body Model

2kV

Storage Temperature Range

-65˚C to +150˚C

Operating Ratings (Note 1)

V

IN

7V to 42V

Operation Junction Temperature

−40˚C to + 125˚C

Electrical Characteristics Specifications with standard typeface are for T

J = 25˚C, and those with boldface

type apply over full Operating Junction Temperature range.V

IN = 24V, RT = 32.4k

Ω unless otherwise stated. (Note 3)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

STARTUP REGULATOR

VccReg

Vcc Regulator Output

6.85

7.15

7.45

V

Vcc LDO Mode turn-off

9

V

Vcc Current Limit

Vcc = 0V

20

mA

VCC SUPPLY

Vcc UVLO Threshold

(Vcc increasing)

5.95

6.35

6.75

V

Vcc Undervoltage Hysteresis

1

V

Bias Current (Iin)

FB = 1.3V

3

4.5

mA

Shutdown Current (Iin)

SD = 0V

50

85

µA

SHUTDOWN THRESHOLDS

Shutdown Threshold

(SD Increasing)

0.5

0.7

0.9

V

Shutdown Hysteresis

0.1

V

Standby Threshold

(Standby Increasing)

1.18

1.225

1.27

V

Standby Hysteresis

0.1

V

SD Pull-up Current Source

5

µA

SWITCH CHARACTERSICS

Buck Switch Rds(on)

160

320

m

Ω

BOOST UVLO

3.8

V

BOOST UVLO Hysteresis

0.56

V

Pre-charge Switch Rds(on)

75

Ω

Pre-charge Switch on-time

275

ns

CURRENT LIMIT

Cycle by Cycle Current Limit

RAMP = 0V

3

3.5

4.25

A

Cycle by Cycle Current Limit Delay

RAMP = 2.5V

100

ns

SOFT-START

SS Current Source

7

10

14

µA

OSCILLATOR

Frequency1

180

200

220

KHz

Frequency2

RT = 11k

Ω

425

485

525

KHz

SYNC Source Impedance

10

k

Ω

SYNC Sink Impedance

160

Ω

SYNC Threshold (falling)

1.4

V

Upper SYNC Frequency

550

KHz

SYNC Pulse Width Minimum

15

ns

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类似零件编号 - LM25005

制造商	部件名	数据表	功能描述
National Semiconductor ...	LM25005	414Kb / 22P	42V, 2.5A Step-Down Switching Regulator
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类似说明 - LM25005

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National Semiconductor ...	LM25005	414Kb / 22P	42V, 2.5A Step-Down Switching Regulator
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