LP2981-29YEUR [TI]
100-MA ULTRA DROPOUT REGULATOR WITH SHUTDOWN; 具有关断功能100 -MA超差稳压器型号: | LP2981-29YEUR |
厂家: | TEXAS INSTRUMENTS |
描述: | 100-MA ULTRA DROPOUT REGULATOR WITH SHUTDOWN |
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 |
ꢀꢁ ꢂꢃ ꢄꢅ
ꢅ ꢆ ꢆ ꢇꢈꢉ ꢊꢀꢋ ꢌꢉꢇꢀ ꢍ ꢎ ꢏꢌꢍ ꢁꢍ ꢊꢋ ꢌꢐ ꢑ ꢊꢀ ꢉꢋꢍ ꢌ
ꢎ ꢒꢋ ꢓ ꢔꢓ ꢊꢋ ꢏꢍ ꢎ ꢕ
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
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
V
3 4
OUT
IN
D
D
D
D
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
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
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
PREVIEW
PREVIEW
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
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
ꢀꢁ 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
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
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
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
PREVIEW
PREVIEW
PREVIEW
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
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
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
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
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
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
ꢀ ꢁ 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
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
ꢀꢁ 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
basic application circuit (continued)
LP2981-xxDBVR (Adjustable Version)
RADJ
ǒ1 ) 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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ꢎꢒ ꢋ ꢓ ꢔꢓ ꢊ ꢋ ꢏꢍ ꢎꢕ
SLVS521B − JULY 2004 − REVISED OCTOBER 2004
recommended operating conditions
MIN
MAX
UNIT
V
†
2.2
V
V
V
Supply input voltage
ON/OFF input voltage
Input-output differential
Output current
16
IN
0
V
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
I
= 1 mA
25°C
25°C
−0.75
−1
1.25
L
Output voltage
tolerance
(see Note 5)
1
2.5
−2
2
3.5
nV
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
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
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
ON/OFF
−40°C to 105°C
−40°C to 125°C
25°C
V
5
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
1.6
V
V
ON/OFF
−40°C to 125°C
0.15
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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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
0.01
−1
5
V
= 0
ON/OFF
−40°C to 125°C
25°C
−1
15
ON/OFF input
current
I
I
µA
ON/OFF
5
V
V
= 5 V
ON/OFF
−40°C to 125°C
15
Peak output
current
≥V
OUT OUT(NOM)
− 5%
25°C
25°C
25°C
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
150
mA
OUT(MAX)
11
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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
Load Current − mA
Figure 4. 5-V/3.3-µF ESR Curves
Figure 5. 5-V/10-µF ESR Curves
Load Current − mA
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
RADJ
R1
ǒ1 ) 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
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
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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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
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
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOT-23
DBV
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
LP2981-28DBVRE4
LP2981-28DBVT
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
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
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for
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Post Office Box 655303 Dallas, Texas 75265
Copyright 2005, Texas Instruments Incorporated
相关型号:
LP2981-30DBVTG4
100-mA Ultra-Low Dropout Regulator With Shutdown, 1.25% Tolerance 5-SOT-23 -40 to 125
TI
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