LP2981-36DBVT_技术文档

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SLVS521B − JULY 2004 − REVISED OCTOBER 2004

DBV (SOT-23) PACKAGE

(TOP VIEW)

D

Available in the Texas Instruments

NanoStar Chip Scale Package

D

Fixed/ADJ Versions

V

GND

ON/OFF

V

OUT

1

2

3

5

4

IN

D

Output Tolerance of:

− 0.75% (A Grade)

− 1.25% (Standard Grade)

†

ADJ/NC

D

Ultra-Low Dropout, Typically

− 200 mV at Full Load of 100 mA

− 7 mV at 1 mA

YEQ, YEU, YZQ, OR YZU (WCSP) PACKAGE

(TOP VIEW)

D

Wide V Range . . . 16 V Max

IN

GND

1 5

ON/OFF

†

Low I . . . 600 µA Typ at Full Load of

2

ADJ/NC

Q

100 mA

V

3 4

OUT

IN

D

Shutdown Current . . . 0.01 µA Typ

Fast Transient Response to Line and Load

Overcurrent and Thermal Protection

High Peak Current Capability

†

Must be left open in fixed-output versions

Portable Applications

− Mobile Phones

− Laptops

− Personal Digital Assistants (PDAs)

− Digital Cameras and Camcorders

− CD and MP3 Players

description/ordering information

The LP2981 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for

both portable and nonportable applications. Available in adjustable version and in fixed voltages of 1.8 V,

2.5 V, 2.7 V, 2.8 V, 2.9 V, 3 V, 3.2 V, 3.3 V, 3.6 V, and 5 V, the family has an output tolerance of 0.75% for the

A-grade devices (1.25% for the standard grade) and is capable of delivering 100-mA continuous load current.

Standard regulator features, such as over-current and over-temperature protection, are included.

The LP2981 has features that make the regulator an ideal candidate for a variety of portable applications:

• Low dropout: A PNP pass element allows a typical dropout of 200 mV at 100-mA load current and 7 mV

at 1-mA load.

• Low quiescent current: The use of a vertical PNP process allows for quiescent currents that are

considerably lower than those associated with traditional lateral PNP regulators.

• Shutdown: A shutdown feature is available, allowing the regulator to consume only 0.01 µA when the

ON/OFF pin is pulled low.

• Small packaging: For the most space-constraint needs, the regulator is available in SOT-23 package

and NanoStar chip scale packaging. NanoStar package technology is a major breakthrough in IC

packaging concepts, using the die as the package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

NanoStar is a trademark of Texas Instruments.

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Copyright  2004, Texas Instruments Incorporated

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1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ꢀ ꢁ ꢂꢃ ꢄꢅ

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ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

description/ordering information (continued)

ORDERING INFORMATION

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

Reel of 3000 LP2981DBVR

Reel of 250 LP2981DBVT

Reel of 3000 LP2981A-125DBVR

Reel of 250 LP2981A-125DBVT

Reel of 3000 LP2981A-18DBVR

Reel of 250 LP2981A-18DBVT

Reel of 3000 LP2981A-25DBVR

Reel of 250 LP2981A-25DBVT

Reel of 3000 LP2981A-27DBVR

Reel of 250 LP2981A-27DBVT

Reel of 3000 LP2981A-28DBVR

Reel of 250 LP2981A-28DBVT

Reel of 3000 LP2981A-29DBVR

Reel of 250 LP2981A-29DBVT

Reel of 3000 LP2981A-30DBVR

Reel of 250 LP2981A-30DBVT

Reel of 3000 LP2981A-32DBVR

Reel of 250 LP2981A-32DBVT

Reel of 3000 LP2981A-33DBVR

Reel of 250 LP2981A-33DBVT

Reel of 3000 LP2981A-36DBVR

Reel of 250 LP2981A-36DBVT

Reel of 3000 LP2981A-50DBVR

Reel of 250 LP2981A-50DBVT

PREVIEW

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

PREVIEW

LP6_

A grade:

0.75% tolerance

−40°C to 125°C

SOT23-5 (DBV)

PREVIEW

LP8_

PREVIEW

3.2 V

3.3 V

3.6 V

5 V

LPC_

PREVIEW

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

DBV: The actual top-side marking has one additional character that designates the assembly/test site.

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

ORDERING INFORMATION (continued)

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

LP2981YEQR

LP2981A-125YEQR

LP2981A-18YEQR

LP2981A-25YEQR

LP2981A-27YEQR

LP2981A-28YEQR

LP2981A-29YEQR

LP2981A-30YEQR

LP2981A-32YEQR

LP2981A-33YEQR

LP2981A-50YEQR

LP2981YZQR

NanoStar − WCSP

0.17-mm Bump (YEQ)

Reel of 3000

3.2 V

3.3 V

5 V

A grade:

0.75% tolerance

−40°C to 125°C

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

LP2981A-125YZQR

LP2981A-18YZQR

LP2981A-25YZQR

LP2981A-27YZQR

LP2981A-28YZQR

LP2981A-29YZQR

LP2981A-30YZQR

LP2981A-32YZQR

LP2981A-33YZQR

LP2981A-50YZQR

NanoFree − WCSP

0.17-mm Bump

(YZQ, Pb-free)

Reel of 3000

3.2 V

3.3 V

5 V

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

YEQ/YZQ: The actual top-side marking has three preceding characters to denote year, month, and sequence code, and one following character

^{to designate the assembly/test site. Pin 1 identifier indicates solder-bump composition (1 = SnPb,}• = Pb-free).

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ꢀ ꢁ ꢂꢃ ꢄꢅ

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ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

ORDERING INFORMATION (continued)

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

LP2981YEUR

LP2981A-125YEUR

LP2981A-18YEUR

LP2981A-25YEUR

LP2981A-27YEUR

LP2981A-28YEUR

LP2981A-29YEUR

LP2981A-30YEUR

LP2981A-32YEUR

LP2981A-33YEUR

LP2981A-50YEUR

LP2981YZUR

NanoStar − WCSP

0.30-mm Bump (YEU)

Reel of 3000

3.2 V

3.3 V

5 V

A grade:

0.75% tolerance

−40°C to 125°C

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

LP2981A-125YZUR

LP2981A-18YZUR

LP2981A-25YZUR

LP2981A-27YZUR

LP2981A-28YZUR

LP2981A-29YZUR

LP2981A-30YZUR

LP2981A-32YZUR

LP2981A-33YZUR

LP2981A-50YZUR

NanoFree − WCSP

0.30-mm Bump

(YZU, Pb-free)

Reel of 3000

3.2 V

3.3 V

5 V

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

YEU/YZU: The actual top-side marking has three preceding characters to denote year, month, and sequence code, and one following character

^{to designate the assembly/test site. Pin 1 identifier indicates solder-bump composition (1 = SnPb,}• = Pb-free).

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ꢀꢁ ꢂꢃ ꢄꢅ

ꢅ ꢆ ꢆ ꢇꢈꢉ ꢊꢀꢋ ꢌꢉꢇꢀ ꢍ ꢎ ꢏꢌꢍ ꢁꢍ ꢊꢋ ꢌꢐꢑ ꢊ ꢀꢉꢋꢍ ꢌ

ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

ORDERING INFORMATION (continued)

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

Reel of 3000 LP2981DBVR

Reel of 250 LP2981DBVT

Reel of 3000 LP2981-125DBVR

Reel of 250 LP2981-125DBVT

Reel of 3000 LP2981-18DBVR

Reel of 250 LP2981-18DBVT

Reel of 3000 LP2981-25DBVR

Reel of 250 LP2981-25DBVT

Reel of 3000 LP2981-27DBVR

Reel of 250 LP2981-27DBVT

Reel of 3000 LP2981-28DBVR

Reel of 250 LP2981-28DBVT

Reel of 3000 LP2981-29DBVR

Reel of 250 LP2981-29DBVT

Reel of 3000 LP2981-30DBVR

Reel of 250 LP2981-30DBVT

Reel of 3000 LP2981-32DBVR

Reel of 250 LP2981-32DBVT

Reel of 3000 LP2981-33DBVR

Reel of 250 LP2981-33DBVT

Reel of 3000 LP2981-36DBVR

Reel of 250 LP2981-36DBVT

Reel of 3000 LP2981-50DBVR

Reel of 250 LP2981-50DBVT

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

2.9 V

3 V

PREVIEW

LP5_

Standard grade:

1.25% tolerance

−40°C to 125°C

SOT-23 (DBV)

PREVIEW

LP7_

PREVIEW

3.2 V

3.3 V

3.6 V

5 V

LPB_

PREVIEW

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

DBV: The actual top-side marking has one additional character that designates the assembly/test site.

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ꢀ ꢁ ꢂꢃ ꢄꢅ

ꢅꢆ ꢆꢇꢈ ꢉ ꢊ ꢀꢋ ꢌ ꢉꢇꢀ ꢍꢎ ꢏꢌ ꢍꢁ ꢍꢊ ꢋ ꢌꢐ ꢑ ꢊꢀꢉꢋꢍ ꢌ

ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

ORDERING INFORMATION (continued)

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

3 V

LP2981YEQR

LP2981−125YEQR

LP2981−18YEQR

LP2981-25YEQR

LP2981-27YEQR

LP2981-28YEQR

LP2981-29YEQR

LP2981-30YEQR

LP2981-32YEQR

LP2981-33YEQR

LP2981-50YEQR

LP2981YZQR

NanoStar − WCSP

0.17-mm Bump (YEQ)

Reel of 3000

3.2 V

3.3 V

5 V

Standard grade:

1.25% tolerance

−40°C to 125°C

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

3 V

LP2981−125YZQR

LP2981−18YZQR

LP2981-25YZQR

LP2981-27YZQR

LP2981-28YZQR

LP2981-29YZQR

LP2981-30YZQR

LP2981-32YZQR

LP2981-33YZQR

LP2981-50YZQR

NanoFree − WCSP

0.17-mm Bump

(YZQ, Pb-free)

Reel of 3000

3.2 V

3.3 V

5 V

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

YEQ/YZQ: The actual top-side marking has three preceding characters to denote year, month, and sequence code, and one following character

^{to designate the assembly/test site. Pin 1 identifier indicates solder-bump composition (1 = SnPb,}• = Pb-free).

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

ꢀꢁ ꢂꢃ ꢄꢅ

ꢅ ꢆ ꢆ ꢇꢈꢉ ꢊꢀꢋ ꢌꢉꢇꢀ ꢍ ꢎ ꢏꢌꢍ ꢁꢍ ꢊꢋ ꢌꢐꢑ ꢊ ꢀꢉꢋꢍ ꢌ

ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

ORDERING INFORMATION (continued)

V

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

OUT

†

PACKAGE

T

J

PART GRADE

‡

(NOM)

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

3 V

LP2981YEUR

LP2981−125YEUR

LP2981−18YEUR

LP2981-25YEUR

LP2981-27YEUR

LP2981-28YEUR

LP2981-29YEUR

LP2981-30YEUR

LP2981-32YEUR

LP2981-33YEUR

LP2981-50YEUR

LP2981YZUR

NanoStar − WCSP

0.30-mm Bump (YEU)

Reel of 3000

3.2 V

3.3 V

5 V

Standard grade:

1.25% tolerance

−40°C to 125°C

ADJ

1.25 V

1.8 V

2.5 V

2.7 V

2.8 V

3 V

LP2981−125YZUR

LP2981−18YZUR

LP2981-25YZUR

LP2981-27YZUR

LP2981-28YZUR

LP2981-29YZUR

LP2981-30YZUR

LP2981-32YZUR

LP2981-33YZUR

LP2981-50YZUR

NanoFree − WCSP

0.30-mm Bump

(YZU, Pb-free)

Reel of 3000

3.2 V

3.3 V

5 V

†

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

YEU/YZU: The actual top-side marking has three preceding characters to denote year, month, and sequence code, and one following character

^{to designate the assembly/test site. Pin 1 identifier indicates solder-bump composition (1 = SnPb,}• = Pb-free).

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

functional block diagram

V

IN

ON/OFF

1.23 V

V

REF

−

+

†

ADJ/NC

R

1

V

OUT

R

Overcurrent/

Overtemperature

Protection

2

GND

†

Fixed versions: Must be left open

ADJ versions: R = ∞, R = ∞

1

2

Figure 1

basic application circuit

LP2981A-xxDBVR (Fixed Version)

V

OUT

V

1

2

5

IN

†

3.3 µF

†

1 µF

GND

‡

§

ON/OFF

3

4

NC

†

‡

§

Minimum C

out

value for stability (can be increased without limit for improved stability and transient response)

ON/OFF must be actively terminated. Connect to V if shutdown feature is not used.

IN

Must be left open

Figure 2

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

basic application circuit (continued)

LP2981-xxDBVR (Adjustable Version)

R_ADJ

ǒ_{1 )}Ǔ

V

OUT

= V

REF

V

1

2

5

IN

R₁

†

3.3 µF

†

1 µF

R

ADJ

GND

ADJ

‡

ON/OFF

3

4

‡

3 39.5 kW

R

1

†

‡

Minimum C

value for stability (can be increased without limit for improved stability and transient response)

See Application Information

out

Figure 3

†

absolute maximum ratings over the virtual junction temperature range (unless otherwise noted)

Continuous input voltage range, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 16 V

IN

ON/OFF input voltage range, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 16 V

ON/OFF

Output voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 9 V

Input/output voltage differential range, V -V

(see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 16 V

IN OUT

Output current, I

(see Note 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited (short-circuit protected)

OUT

Package thermal impedance, θ (see Notes 3 and 4): DBV package . . . . . . . . . . . . . . . . . . . . . . . . 206°C/W

JA

YEQ/YZQ package . . . . . . . . . . . . . . . . . . TBD°C/W

YEU/YZU package . . . . . . . . . . . . . . . . . . . TBD°C/W

Operating virtual junction temperature, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

J

Storage temperature range, T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C

stg

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. If load is returned to a negative power supply, the output must be diode clamped to GND.

2. The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse biased

(V > V

for more details).

), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see Application Information

IN OUT

3. Maximum power dissipation is a function of T (max), q , and T . The maximum allowable power dissipation at any allowable

J

JA

A

ambient temperature is P = (T (max) − T )/q . Operating at the absolute maximum T of 150°C can affect reliability.

D

J

A

JA

J

4. The package thermal impedance is calculated in accordance with JESD 51-7.

9

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ꢅꢆ ꢆꢇꢈ ꢉ ꢊ ꢀꢋ ꢌ ꢉꢇꢀ ꢍꢎ ꢏꢌ ꢍꢁ ꢍꢊ ꢋ ꢌꢐ ꢑ ꢊꢀꢉꢋꢍ ꢌ

ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

recommended operating conditions

MIN

MAX

UNIT

V

†

2.2

V

Supply input voltage

ON/OFF input voltage

Input-output differential

Output current

16

IN

0

V

ON/OFF

IN

-V

0.7

11

100

125

V

IN OUT

I

mA

°C

OUT

Virtual junction temperature

T

J

−40

†

Minimum V of 2.2 V is needed for proper biasing of LDO control circuitry.

IN

electrical characteristics at specified free-air temperature range, V = V

+ 1 V,

OUT

IN

OUT(NOM)

V

= 2 V, C = 1 mF, IL = 1 mA, C

= 4.7 mF, ADJ version: ADJ connected to V

(unless

ON/OFF

IN

OUT

otherwise noted)

LP2981A-XX

MIN TYP MAX

0.75 −1.25

LP2981-XX

PARAMETER

TEST CONDITIONS

UNIT

T

A

MIN

TYP MAX

I

= 1 mA

25°C

−0.75

−1

1.25

L

Output voltage

tolerance

(see Note 5)

1

2.5

−2

2

3.5

nV

%V

NOM

OUT

= 1 mA to 100 mA

L

−40°C to 125°C

25°C

−2.5

−3.5

0.007 0.014

0.032

0.007 0.014

0.032

Output voltage

line regulation [V

V

=

IN

/nV

IN

%/V

OUT

+ 1 V] to 16 V

−40°C to 125°C

25°C

OUT(NOM)

1

3

5

1

3

5

I

L

I

L

I

L

I

L

I

L

I

L

I

L

I

L

= 0

−40°C to 125°C

25°C

7

10

7

10

= 1 mA

= 25 mA

= 100 mA

= 0

Dropout

−40°C to 125°C

25°C

15

voltage

(see Note 6)

V

-V

mV

IN OUT

70

100

150

250

375

95

70

100

150

250

375

95

−40°C to 125°C

25°C

200

65

200

65

−40°C to 125°C

25°C

−40°C to 125°C

25°C

125

110

170

300

550

800

1500

0.8

2

125

110

170

300

550

800

1500

0.8

2

80

= 1 mA

= 25 mA

= 100 mA

−40°C to 125°C

25°C

200

600

200

600

Ground pin

current

−40°C to 125°C

25°C

I

µA

GND

−40°C to 125°C

25°C

V

< 0.3 V (OFF)

< 0.15 V (OFF)

0.01

0.05

0.01

0.05

ON/OFF

−40°C to 105°C

−40°C to 125°C

25°C

V

5

1.4

0.5

1.4

0.5

High = O/P ON

Low = O/P OFF

ON/OFF input

voltage

(see Note 7)

−40°C to 125°C

25°C

1.6

V

ON/OFF

−40°C to 125°C

0.15

NOTES: 5. V

= V

for ADJ version

OUT

REF

6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured

with a 1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum V = 2.2 V must be observed

IN

for proper biasing of LDO control circuitry.

7. The ON/OFF input must be actively terminated. Connect to V if this function is not used (see Application Information).

IN

10

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ꢅ ꢆ ꢆ ꢇꢈꢉ ꢊꢀꢋ ꢌꢉꢇꢀ ꢍ ꢎ ꢏꢌꢍ ꢁꢍ ꢊꢋ ꢌꢐꢑ ꢊ ꢀꢉꢋꢍ ꢌ

ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

electrical characteristics at specified free-air temperature range, V = V

+ 1 V,

OUT

IN

OUT(NOM)

V

= 2 V, C = 1 mF, IL = 1 mA, C

= 4.7 mF, ADJ version: ADJ connected to V (unless

ON/OFF

IN

OUT

otherwise noted) (continued)

LP2981A-XX

MIN TYP MAX

LP2981-XX

PARAMETER

TEST CONDITIONS

UNIT

T

A

MIN

TYP MAX

25°C

0.01

−1

5

V

= 0

ON/OFF

−40°C to 125°C

25°C

−1

15

ON/OFF input

current

I

µA

ON/OFF

5

V

= 5 V

ON/OFF

−40°C to 125°C

15

Peak output

current

≥V

OUT OUT(NOM)

− 5%

25°C

150

400

160

63

150

400

160

63

mA

µV

OUT(PK)

Output noise

voltage (RMS)

BW = 300 Hz to 50 kHz,

C = 10 µF

OUT

V

n

Ripple

rejection

nV /nV

OUT IN

f = 1kHz, C

OUT

= 10 µF

dB

Short-circuit

current

I

R

= 0 (steady state)

L

150

mA

OUT(MAX)

11

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ꢅꢆ ꢆꢇꢈ ꢉ ꢊ ꢀꢋ ꢌ ꢉꢇꢀ ꢍꢎ ꢏꢌ ꢍꢁ ꢍꢊ ꢋ ꢌꢐ ꢑ ꢊꢀꢉꢋꢍ ꢌ

ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

APPLICATION INFORMATION

capacitors

input capacitor (C )

in

A minimum value of 1 mF (over the entire operating temperature range) is required at the input of the LP2981.

In addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog

ground. There is no Equivalent Series Resistance (ESR) requirement for this capacitor, and the capacitance

can be increased without limit. A good quality ceramic or tantalum capacitor can be used.

output capacitor (C

)

out

As a PNP regulator, the LP2981 requires the output capacitor to meet both a minimum capacitance and ESR

value. Required ESR values as a function of load current are provided for various output voltages, load currents,

and capacitances (see Figures 1–4).

Minimum C : 3.3 µF (can be increased without limit to improve transient response stability margin)

out

ESR range: see Figures 1–4

Load Current − mA

Figure 4. 5-V/3.3-µF ESR Curves

Figure 5. 5-V/10-µF ESR Curves

Load Current − mA

Figure 6. 3-V/3.3-µF ESR Curves

Figure 7. 3-V/10-µF ESR Curves

12

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ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

APPLICATION INFORMATION

output capacitor (C ) (continued)

out

It is critical that both the minimum capacitance and ESR requirement be met over the entire operating

temperature range. Depending on the type of capacitor used, both of these parameters can vary significantly

with temperature (see capacitor characteristics section).

capacitor characteristics

ceramics

Due to their very low ESR values, ceramic capacitors are not suitable for use as the output capacitor. For

instance, a typical 2.2-µF ceramic capacitor has an ESR in the range of 10 mΩ to 20 mΩ and, thus, easily can

fall out of minimum ESR requirements under certain operating conditions.

If a ceramic capacitor is used at the output, a 1-Ω resistor should be placed in series with the capacitor to raise

the ESR seen by the regulator.

tantalum

Solid tantalum capacitors are optimal choices for the LP2981, but they still must meet the minimum ESR

requirement. Note that the ESR of a tantalum capacitor increases as temperature drops, as much as double

from 25°C to −40°C. Thus, ESR margins must be maintained over the temperature range to prevent regulator

instability. For operation at very low temperatures, paralleling a tantalum capacitor with a ceramic one keeps

the combined ESR from increasing near the upper limit of the ESR curve.

aluminum

Aluminum capacitors can be used, but use with the LP2981 is impractical due to their large physical dimensions.

They also must meet the ESR requirements over the full temperature range. In this regard, aluminium capacitors

are at a big disadvantage due to their sharp ESR increase as temperature drops. For example, over a

temperature drop from 20°C to −40°C, the ESR of an aluminum electrolytic capacitor can increase by a factor

of 50. In addition, some of the electrolytes used in these capacitors can freeze at −25°C, making the capacitor

nonoperational.

ON/OFF operation

The LP2981 allows for a shutdown mode via the ON/OFF pin. If the shutdown feature is not used, ON/OFF

should be connected to the input to ensure that the regulator is on at all times. To drive ON/OFF:

• A LOW (≤0.3 V) turns the regulator OFF; a HIGH (≥1.6 V) turns it ON.

• Use either a totem-pole output or an open-collector output with a pullup resistor tied to V (or another

IN

logic supply). The HIGH signal can exceed V , but must not exceed the absolute maximum ratings of

IN

20 V for the ON/OFF pin.

• Apply a signal with a slew rate of ≥40 mV/µs. A slow slew rate can cause the shutdown function to

operate incorrectly.

ADJ version

From Figure 3, V

is set according to the following equation:

OUT

R_ADJ

R₁

ǒ_{1 )}Ǔ

V

= V

OUT

REF

where V

= 1.23 V (nominal). Under no-load conditions, a minimum “bias” current is required through the R

REF

ADJ

and R divider to maintain regulator stability. Therefore, the maximum value for R should be X39.5 kΩ.

1

13

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ꢅꢆ ꢆꢇꢈ ꢉ ꢊ ꢀꢋ ꢌ ꢉꢇꢀ ꢍꢎ ꢏꢌ ꢍꢁ ꢍꢊ ꢋ ꢌꢐ ꢑ ꢊꢀꢉꢋꢍ ꢌ

ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

APPLICATION INFORMATION

reverse input-output voltage

An inherent diode is present across the PNP pass element of the LP2981.

V

IN

V

OUT

With the anode connected to the output, this diode is reverse biased during normal operation, since the input

voltage is higher than the output. However, if the output is pulled one V higher than the input, or if the input

BE

is abruptly stepped below the output, this diode is forward biased and can cause a parasitic silicon-controlled

rectifier (SCR) to latch, resulting in current flowing from the output to the input (values in excess of 100 mA can

cause damage). Thus, to prevent possible damage to the regulator in any application where the output may be

pulled above the input, an external Schottky diode must be connected between the output and input. With the

anode on output, this Schottky limits the reverse voltage across the output and input pins to ꢀ0.3 V, preventing

the regulator’s internal diode from forward biasing.

Schottky

V

IN

V

OUT

LP2981

pin 4: NC

Pin 4 must be left OPEN. Do not connect anything to this pin, as it is used for post package trim.

14

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ꢎ ꢒꢋ ꢓ ꢔꢓꢊ ꢋꢏ ꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

WAFER CHIP SCALE INFORMATION

LP2981x-xxYEQ NanoStar (0.17-mm Bump)

LP2981x-xxYZQ NanoFree (0.17-mm Pb-Free Bump)

987

1,037

1,287

1,337

Pin A1 Index Area

0,19

0,15

0,625 Max

0,15

0,10

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. NanoStar package configuration.

D. This package is tin-lead (SnPb); consult the factory for availability of lead-free material.

15

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ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ

SLVS521B − JULY 2004 − REVISED OCTOBER 2004

WAFER CHIP SCALE INFORMATION

LP2981x-xxYEU NanoStar (0.30-mm Bump)

LP2981x-xxYZU NanoFree (0.30-mm Pb-Free Bump)

987

1,037

1,287

1,337

Pin A1 Index Area

0,35

0,25

0,75 Max

0,30

0,20

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. NanoStar package configuration.

D. This package is tin-lead (SnPb); consult the factory for availability of lead-free material.

16

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PACKAGE OPTION ADDENDUM

www.ti.com

24-Jun-2005

PACKAGING INFORMATION

Orderable Device

LP2981-28DBVR

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

SOT-23

DBV

5

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-28DBVRE4

LP2981-28DBVT

SOT-23

DBV

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-28DBVTE4

LP2981-30DBVR

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-30DBVRE4

LP2981-30DBVT

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-30DBVTE4

LP2981-33DBVR

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-33DBVRE4

LP2981-33DBVT

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

LP2981-33DBVTE4

LP2981A-28DBVR

LP2981A-28DBVRE4

LP2981A-28DBVT

LP2981A-28DBVTE4

LP2981A-30DBVR

LP2981A-30DBVRE4

LP2981A-30DBVT

LP2981A-30DBVTE4

LP2981A-33DBVR

LP2981A-33DBVRE4

LP2981A-33DBVT

LP2981A-33DBVTE4

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

⁽¹⁾The marketing status values are defined as follows:

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

24-Jun-2005

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 2

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process

in which TI products or services are used. Information published by TI regarding third-party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

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Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

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Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

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is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products

Applications

Audio

Amplifiers

amplifier.ti.com

www.ti.com/audio

Data Converters

dataconverter.ti.com

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www.ti.com/automotive

DSP

dsp.ti.com

Broadband

Digital Control

Military

www.ti.com/broadband

www.ti.com/digitalcontrol

www.ti.com/military

Interface

Logic

interface.ti.com

logic.ti.com

Power Mgmt

Microcontrollers

power.ti.com

Optical Networking

Security

www.ti.com/opticalnetwork

www.ti.com/security

www.ti.com/telephony

www.ti.com/video

microcontroller.ti.com

Telephony

Video & Imaging

Wireless

www.ti.com/wireless

Mailing Address:

Texas Instruments

Post Office Box 655303 Dallas, Texas 75265


型号：	LP2981-36DBVT
厂家：	TEXAS INSTRUMENTS
描述：	100-MA ULTRA DROPOUT REGULATOR WITH SHUTDOWN 具有关断功能100 -MA超差稳压器线性稳压器IC 调节器电源电路光电二极管输出元件
文件：	总20页 (文件大小：344K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LP2981-36DBVT [TI]

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