LM2717MT-ADJ datasheet(5/16 Pages) NSC

部件名	LM2717MT-ADJ

功能描述	Dual Step-Down DC/DC Converter

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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

−0.3V to 22V

SW1 Voltage

−0.3V to 22V

SW2 Voltage

−0.3V to 22V

FB1 Voltage

−0.3V to 7V

FB2 Voltage

−0.3V to 7V

V

C1 Voltage

1.75V

≤ V

C1

≤ 2.25V

V

C2 Voltage

0.965V

≤ V

C2

≤ 1.565V

SHDN1 Voltage

−0.3V to 7.5V

SHDN2 Voltage

−0.3V to 7.5V

SS1 Voltage

−0.3V to 2.1V

SS2 Voltage

−0.3V to 2.1V

FSLCT Voltage

AGND to 5V

Maximum Junction Temperature

150˚C

Power Dissipation(Note 2)

Internally Limited

Lead Temperature

300˚C

Vapor Phase (60 sec.)

215˚C

Infrared (15 sec.)

220˚C

ESD Susceptibility (Note 3)

Human Body Model

2kV

Operating Conditions

Operating Junction

Temperature Range

(Note 4)

−40˚C to +125˚C

Storage Temperature

−65˚C to +150˚C

Supply Voltage

4V to 20V

SW1 Voltage

20V

SW2 Voltage

20V

Switching Frequency

300kHz to 600kHz

Electrical Characteristics

Specifications in standard type face are for T

J = 25˚C and those with boldface type apply over the full Operating Tempera-

ture Range (T

J = −40˚C to +125˚C). VIN = 5V, IL = 0A, and FSW = 300kHz unless otherwise specified.

Symbol

Parameter

Conditions

Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

I

Q

Total Quiescent Current (both

switchers)

Not Switching

2.7

6

mA

Switching, switch open

6

12

mA

V

SHDN =0V

9

27

µA

V

BG

Bandgap Voltage

1.248

1.230

1.267

1.294

1.299

V

%V

BG/

∆V

IN

Bandgap Voltage Line

Regulation

-0.01

0.01

0.125

%/V

V

FB1

Buck 1 Feedback Voltage

1.236

1.214

1.258

1.286

1.288

V

FB2

Buck 2 Feedback Voltage

1.236

1.214

1.258

1.286

1.288

V

I

CL1(Note 6)

Buck 1 Switch Current Limit

V

IN = 8V (Note 7)

2.2

A

V

IN = 12V, VOUT = 3.3V

1.4

1.65

2.0

I

CL2(Note 6)

Buck 2 Switch Current Limit

V

IN = 8V (Note 7)

3.2

A

V

IN = 12V, VOUT = 5V

2.6

3.05

3.5

I

B1

Buck 1 FB Pin Bias Current

(Note 8)

V

IN = 20V

70

400

nA

I

B2

Buck 2 FB Pin Bias Current

(Note 8)

V

IN = 20V

65

400

nA

V

IN

Input Voltage Range

420

V

g

m1

Buck 1 Error Amp

Transconductance

∆I = 20µA

1340

µmho

g

m2

Buck 2 Error Amp

Transconductance

∆I = 20µA

1360

µmho

A

V1

Buck 1 Error Amp Voltage

Gain

134

V/V

A

V2

Buck 2 Error Amp Voltage

Gain

136

V/V

D

MAX

Maximum Duty Cycle

89

93

%

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