LP2981-50 [TI]
100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN; 100毫安，带有关断超低压差稳压器
| 型号： | LP2981-50 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN |
| 文件： | 总14页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
FEATURES
PORTABLE APPLICATIONS
•
•
•
•
•
Mobile Phones
Laptops
Personal Digital Assistants (PDAs)
Digital Cameras and Camcorders
CD and MP3 Players
•
Output Tolerance of
–
–
0.75% (A Grade)
1.25% (Standard Grade)
•
Ultra-Low Dropout, Typically
–
–
200 mV at Full Load of 100 mA
7 mV at 1 mA
DBV (SOT-23) PACKAGE
(TOP VIEW)
•
•
•
•
•
•
Wide VIN Range…16 V Max
Low IQ…600 µA Typ at Full Load of 100 mA
Shutdown Current…0.01 µA Typ
Fast Transient Response to Line and Load
Overcurrent and Thermal Protection
High Peak Current Capability
V
GND
V
OUT
1
2
3
5
4
IN
ON/OFF
NC
NC − No connect; must be left open
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 fixed voltages of 2.9 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 overcurrent and overtemperature 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-constrained needs, the regulator is available in the SOT-23 package.
ORDERING INFORMATION(1)
VOUT
(NOM)
ORDERABLE
PART NUMBER
TOP-SIDE
TJ
PART GRADE
PACKAGE(2)
MARKING(3)
Reel of 3000
LP2981A-29DBVR
LP2981A-29DBVT
LP2981A-50DBVR
LP2981A-50DBVT
LP2981-29DBVR
LP2981-29DBVT
LP2981-50DBVR
LP2981-50DBVT
2.9 V
5 V
SOT-23-5 – DBV
SOT-23-5 – DBV
SOT-23-5 – DBV
SOT-23-5 – DBV
LRB_
Reel of 250
Reel of 3000
Reel of 250
Reel of 3000
Reel of 250
Reel of 3000
Reel of 250
A grade:
0.75% tolerance
LPE_
LP3_
LPD_
–40°C to 125°C
2.9 V
5 V
Standard grade:
1.25% tolerance
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
(3) The actual top-side marking has one additional character that designates the assembly/test site.
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
FUNCTIONAL BLOCK DIAGRAM
V
IN
ON/OFF
1.23 V
V
REF
−
+
R
1
V
OUT
Overcurrent/
R
2
Overtemperature
Protection
GND
BASIC APPLICATION CIRCUIT
LP2981
V
OUT
V
1
2
5
IN
3.3 µF
(see Note A)
1 µF
(see Note A)
GND
ON/OFF
(see Note B)
NC
(see Note C)
3
4
A. Minimum COUT value for stability (can be increased without limit for improved stability and transient response)
B. ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
C. Pin 4 (NC) must be left open. Do not connect anything to this pin.
Figure 1.
2
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LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
Absolute Maximum Ratings(1)
over virtual junction temperature range (unless otherwise noted)
MIN
–0.3
–0.3
–0.3
–0.3
MAX
16
16
9
UNIT
VIN
Continuous input voltage range
ON/OFF input voltage range
Output voltage range(2)
V
V
V
V
VON/OFF
VO
VIN – VOUT
Input/output voltage differential range(3)
16
Internally limited
(short-circuit protected)
IOUT
Output current(4)
θJA
TJ
Package thermal impedance(4)(5)
Operating virtual junction temperature
Storage temperature range
206
150
°C/W
°C
Tstg
–65
150
°C
(1) 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.
(2) If load is returned to a negative power supply, the output must be diode clamped to GND.
(3) The PNP pass transistor has a parasitic diode connected between the input and output. This diode normally is reverse biased
(VIN > VOUT), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see Application Information for
more details).
(4) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
(5) The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions
MIN
2.2(1)
0
MAX
16
UNIT
V
VIN
Supply input voltage
ON/OFF input voltage
Input-output differential
Output current
VON/OFF
VIN – VOUT
IOUT
VIN
11
V
0.7
V
100
125
mA
°C
TJ
Virtual junction temperature
–40
(1) Minimum VIN of 2.2 V is needed for proper biasing of LDO control circuitry.
3
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LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
Electrical Characteristics
at specified free-air temperature range, VIN = VOUT(NOM) + 1 V, VON/OFF = 2 V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF (unless
otherwise noted)
LP2981A-xx
MIN TYP MAX
0.75 –1.25
LP2981-xx
PARAMETER
TEST CONDITIONS
IL = 1 mA
IL = 1 mA to 100 mA
TA
UNIT
%VNOM
%/V
MIN TYP MAX
25°C
25°C
–0.75
–1
1.25
Output voltage
tolerance
∆VOUT
1
2.5
–2
2
3.5
–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 VIN = (VOUT(NOM) + 1 V) to
line regulation
∆VOUT/∆VIN
16 V
–40°C to 125°C
25°C
1
3
5
1
3
5
IL = 0
–40°C to 125°C
25°C
7
10
7
10
IL = 1 mA
IL = 25 mA
IL = 100 mA
IL = 0
–40°C to 125°C
25°C
15
15
Dropout
VIN – VOUT
mV
voltage(1)
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
125
110
170
300
550
80
80
IL = 1 mA
IL = 25 mA
–40°C to 125°C
25°C
200
200
Ground pin
current
IGND
–40°C to 125°C
25°C
µA
600 1000
1700
600 1000
1700
IL = 100 mA
–40°C to 125°C
25°C
VON/OFF < 0.3 V (OFF)
VON/OFF < 0.15 V (OFF)
0.01
0.05
0.8
2
0.01
0.05
0.8
2
–40°C to 105°C
–40°C to 125°C
25°C
5
5
1.4
0.5
0.01
5
1.4
0.5
0.01
5
High = O/P ON
Low = O/P OFF
VON/OFF = 0
–40°C to 125°C
25°C
1.6
1.6
ON/OFF input
voltage(2)
VON/OFF
V
–40°C to 125°C
25°C
0.15
–1
0.15
–1
–40°C to 125°C
25°C
ON/OFF input
current
ION/OFF
µA
VON/OFF = 5 V
–40°C to 125°C
15
15
Peak output
current
IOUT(PK)
Vn
V
OUT ≥ VOUT(NOM) – 5%
25°C
150
400
400
mA
Output noise
voltage (RMS)
BW = 300 Hz to 50 kHz,
COUT = 10 µF
25°C
25°C
25°C
160
63
160
63
µV
dB
∆VOUT/∆VIN Ripple rejection f = 1 kHz, COUT = 10 µF
Short-circuit
current
IOUT(MAX)
RL = 0 (steady state)
150
150
mA
(1) 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 VIN = 2.2 V must be observed for proper
biasing of LDO control circuitry.
(2) The ON/OFF input must be actively terminated. Connect to VIN if this function is not used (see Application Information).
4
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LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
APPLICATION INFORMATION
Capacitors
Input Capacitor (Cin)
A minimum value of 1 µF (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 (Cout
)
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 Figure 2 through Figure 5).
•
•
Minimum Cout: 3.3 µF (can be increased without limit to improve transient response stability margin)
ESR range: see Figure 2 through Figure 5
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).
Load Current − mA
Load Current − mA
Figure 2. 5-V/3.3-µF ESR Curves
Figure 3. 5-V/10-µF ESR Curves
Load Current − mA
Load Current − mA
Figure 4. 3-V/3.3-µF ESR Curves
Figure 5. 3-V/10-µF ESR Curves
5
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LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
APPLICATION INFORMATION (continued)
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 doubling
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 VIN (or another logic
supply). The HIGH signal can exceed VIN, but must not exceed the absolute maximum ratings of 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.
6
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LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS768–MARCH 2007
APPLICATION INFORMATION (continued)
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 VBE higher than the input, or if the input 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
7
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PACKAGE OPTION ADDENDUM
www.ti.com
29-May-2007
PACKAGING INFORMATION
Orderable Device
LP2981-29DBVR
Status (1)
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
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
LP2981-29DBVRG4
LP2981-29DBVT
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
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
LP2981-29DBVTG4
LP2981-50DBVR
250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
LP2981-50DBVRG4
LP2981-50DBVT
3000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
250 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
LP2981-50DBVTG4
LP2981A-29DBVR
LP2981A-29DBVRG4
LP2981A-29DBVT
LP2981A-29DBVTG4
LP2981A-50DBVR
LP2981A-50DBVRG4
LP2981A-50DBVT
LP2981A-50DBVTG4
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:
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), Pb-Free (RoHS Exempt), 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.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
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)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
29-May-2007
(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
PACKAGE MATERIALS INFORMATION
www.ti.com
9-Jun-2007
TAPE AND REEL INFORMATION
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
9-Jun-2007
Device
Package Pins
Site
Reel
Reel
A0 (mm)
B0 (mm)
K0 (mm)
P1
W
Pin1
Diameter Width
(mm) (mm) Quadrant
(mm)
180
180
180
180
180
180
180
180
(mm)
LP2981-29DBVR
LP2981-29DBVT
LP2981-50DBVR
LP2981-50DBVT
LP2981A-29DBVR
LP2981A-29DBVT
LP2981A-50DBVR
LP2981A-50DBVT
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
5
5
5
5
5
5
5
5
LEN
LEN
LEN
LEN
LEN
LEN
LEN
LEN
9
9
9
9
9
9
9
9
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
1.4
1.4
1.4
1.4
1.4
1.4
1.4
1.4
4
4
4
4
4
4
4
4
8
8
8
8
8
8
8
8
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
TAPE AND REEL BOX INFORMATION
Device
Package
Pins
Site
Length (mm) Width (mm) Height (mm)
LP2981-29DBVR
LP2981-29DBVT
LP2981-50DBVR
LP2981-50DBVT
LP2981A-29DBVR
LP2981A-29DBVT
LP2981A-50DBVR
LP2981A-50DBVT
DBV
DBV
DBV
DBV
DBV
DBV
DBV
DBV
5
5
5
5
5
5
5
5
LEN
LEN
LEN
LEN
LEN
LEN
LEN
LEN
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
182.0
20.0
20.0
20.0
20.0
20.0
20.0
20.0
20.0
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
9-Jun-2007
Pack Materials-Page 3
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TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would
reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement
specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications
of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related
requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any
applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its
representatives against any damages arising out of the use of TI products in such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DSP
Applications
Audio
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/audio
Automotive
Broadband
Digital Control
Military
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
interface.ti.com
logic.ti.com
Logic
Power Mgmt
Microcontrollers
RFID
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
www.ti-rfid.com
www.ti.com/lpw
Telephony
Low Power
Wireless
Video & Imaging
Wireless
www.ti.com/wireless
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