LM2645 datasheet(8/20 Pages) NSC

부품명	LM2645

상세설명	Advanced Two-Phase Switching Controller With Two Linear Outputs

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홈페이지	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.

Voltages from the indicated pins to SGND/PGND:

VIN, ILIM1, ILIM2, KS1, KS2,

LDODRV

−0.3V to 31V

SW1, SW2, RSNS1, RSNS2

−0.3 to (V

IN +

0.3)V

VO1, VO2, FB1_FIX, FB2_FIX,

VDD1, VDD2, EXT

−0.3V to 6V

SD, ON1, SS1, ON2, SS2, LDOFB,

F

SEL, UV_DELAY, PGOOD1, OUT3,

PGOOD2, COMP1, COMP2,

FPWM/2NDFB

−0.3V to (VLIN5

+0.3)V

CBOOT

1 to SW1, CBOOT2 to SW2

−0.3V to 7V

LDRV1, LDRV2

−0.3V to

(VDD+0.3)V

HDRV1 to SW1, HDRV2 to SW2

−0.3V

HDRV1 to CBOOT1, HDRV2 to

CBOOT2

+0.3V

Power Dissipation (T

A = 25˚C,

(Note 2)

1.56W

Junction Temperature (T

J)

(Note 2)

+150˚C

Ambient Storage Temperature

Range

−65˚C to +150˚C

Soldering Dwell Time, Temperature

(Note 3)

Wave

Infrared

Vapor Phase

4 sec, 260˚C

10sec, 240˚C

75sec, 219˚C

ESD Rating (Note 4)

2kV

Operating Ratings(Note 1)

VIN (VIN and VLIN5 separate)

5.5V to 30V

VIN (VLIN5 tied to VIN)

4.5V to 5.5V

Junction Temperature

0˚C to +125˚C

EXT

5.5V max.

Electrical Characteristics

Unless otherwise specified, V

IN = 15V, SGND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type ap-

ply over the entire operating junction temperature range, 0˚C to +125˚C. Specifications appearing in plain type are measured

using low duty cycle pulse testing with T

A = 25˚C (Note 5), (Note 6). Min/Max limits are guaranteed by design, test, or statisti-

cal analysis.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

SYSTEM

∆V

OUT/VOUT

Load Regulation

V

IN =15V, Vcompx = 0.5V to 1.5V

0.04

%

∆V

OUT/VOUT

Line Regulation

5.5V

≤ V

IN ≤ 30V, Vcompx =1.25V

0.04

%

V

FBX_FIX

Feedback Voltage in

Adjustable Mode

5.5V

≤ VIN ≤ 30V

1.217

1.238

1.259

V

OUT

V

OUTx accuracy at fixed

output mode

5.5V

≤ V

IN ≤ 30V, VOUT1 = 5V, VOUT2

= 3.3V

−2.4

+2.4

%

I

VIN

Input Supply Current

ON1 = ON2 = 5V and

5.5V

≤ V

IN ≤ 30V

1.5

2.8

mA

ON1 = ON2 = 5V and

4.5V

≤ V

IN = VLIN5 ≤ 5.5V

1.3

2.8

mA

Standby (Note 7)

ON1 = ON2 = 0V, V

SD =5V

50

120

µA

Shutdown V

SD =0V

5

30

µA

VLIN5

VLIN5 Output

Voltage(Note 8)

IVLIN5 = 0 to 25mA, EXT = 0V,

5.5V

≤ VIN ≤ 30V, SD = 5V

4.65

5

5.35

V

CLos

Current Limit

Comparator Offset

(VILIMX −VRSNSX)

VKS1−VILIM1 = VKS2-VILIM2

=140mV

±2mV

I

CL

Current Limit Sink

Current

8

10

12

µA

I

ss_SC

Soft-Start Source

Current

V

ss1 =Vss2 =1V

0.5

2

3.5

µA

I

ss_SK

Soft-Start Sink Current

V

ss1 =Vss2 =1V

24

µA

V

ssto

Soft-Start Timeout

Threshold

(Note 9)

2V

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