TI LP2981A

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
•
•
•
•
•
•
•
•
•
•
•
•
•
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
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
Mobile Phones
Laptops
Personal Digital Assistants (PDAs)
Digital Cameras and Camcorders
CD and MP3 Players
DBV (SOT-23) PACKAGE
(TOP VIEW)
VIN
GND
ON/OFF
1
5
VOUT
4
NC
2
3
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)
TJ
PART GRADE
VOUT
(NOM)
PACKAGE (2)
2.9 V
SOT-23-5 – DBV
5V
SOT-23-5 – DBV
2.9 V
SOT-23-5 – DBV
5V
SOT-23-5 – DBV
A grade:
0.75% tolerance
–40°C to 125°C
Standard grade:
1.25% tolerance
(1)
(2)
(3)
ORDERABLE
PART NUMBER
Reel of 3000
LP2981A-29DBVR
Reel of 250
LP2981A-29DBVT
Reel of 3000
LP2981A-50DBVR
Reel of 250
LP2981A-50DBVT
Reel of 3000
LP2981-29DBVR
Reel of 250
LP2981-29DBVT
Reel of 3000
LP2981-50DBVR
Reel of 250
LP2981-50DBVT
TOP-SIDE
MARKING (3)
LRB_
LPE_
LP3_
LPD_
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.
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
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
VIN
ON/OFF
1.23 V
VREF
−
+
R1
VOUT
Overcurrent/
Overtemperature
Protection
R2
GND
BASIC APPLICATION CIRCUIT
LP2981
VIN
1
VOUT
5
3.3 µF
(see Note A)
1 µF
(see Note A)
GND
ON/OFF
(see Note B)
2
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
NC
(see Note C)
Submit Documentation Feedback
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
MAX
VIN
Continuous input voltage range
–0.3
16
UNIT
V
VON/OFF
ON/OFF input voltage range
–0.3
16
V
VO
Output voltage
range (2)
–0.3
9
V
VIN – VOUT
Input/output voltage differential range (3)
–0.3
16
V
Internally limited
(short-circuit protected)
IOUT
Output current (4)
θJA
Package thermal impedance (4) (5)
206
°C/W
TJ
Operating virtual junction temperature
150
°C
Tstg
Storage temperature range
150
°C
(1)
(2)
(3)
(4)
(5)
–65
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.
If load is returned to a negative power supply, the output must be diode clamped to GND.
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).
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.
The package thermal impedance is calculated in accordance with JESD 51-7.
Recommended Operating Conditions
VIN
Supply input voltage
VON/OFF
ON/OFF input voltage
VIN – VOUT
Input-output differential
IOUT
Output current
TJ
Virtual junction temperature
(1)
MIN
MAX
2.2 (1)
16
V
0
VIN
V
0.7
11
V
100
mA
125
°C
–40
UNIT
Minimum VIN of 2.2 V is needed for proper biasing of LDO control circuitry.
Submit Documentation Feedback
3
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)
PARAMETER
∆VOUT
∆VOUT/∆VIN
Output voltage
tolerance
Output voltage
line regulation
TEST CONDITIONS
IL = 1 mA
IL = 1 mA to 100 mA
VIN = (VOUT(NOM) + 1 V) to
16 V
Dropout
voltage (1)
IL = 1 mA
2.5
–3.5
–40°C to 125°C
–40°C to 125°C
1
10
70
100
3
7
10
70
100
80
15
200
65
110
600
1000
80
110
170
200
300
600
1000
550
–40°C to 125°C
95
125
170
25°C
250
375
95
300
550
1700
0.01
0.8
0.01
0.8
–40°C to 105°C
0.05
2
0.05
2
5
25°C
–40°C to 125°C
1.6
0.5
25°C
0.01
25°C
Vn
Output noise
voltage (RMS)
BW = 300 Hz to 50 kHz,
COUT = 10 µF
∆VOUT/∆VIN
Ripple rejection
IOUT(MAX)
Short-circuit
current
0.01
5
–40°C to 125°C
VOUT ≥ VOUT(NOM) – 5%
0.15
–1
25°C
–1
5
15
150
V
0.5
0.15
–40°C to 125°C
Peak output
current
1.4
1.6
–40°C to 125°C
IOUT(PK)
5
1.4
25°C
µA
1700
25°C
–40°C to 125°C
mV
150
250
200
%/V
5
125
–40°C to 125°C
VON/OFF = 0
1
375
65
0.014
0.032
150
25°C
ON/OFF input
voltage (2)
3.5
15
200
UNIT
2 %VNOM
0.007
3
7
MAX
1.25
5
25°C
IL = 25 mA
0.014
TYP
0.032
–40°C to 125°C
VON/OFF = 5 V
(2)
0.007
–40°C to 125°C
Low = O/P OFF
(1)
–2.5
25°C
25°C
High = O/P ON
4
–2
–40°C to 125°C
VON/OFF < 0.15 V (OFF)
ION/OFF
–1.25
1
25°C
VON/OFF < 0.3 V (OFF)
ON/OFF input
current
0.75
–1
–40°C to 125°C
IL = 100 mA
VON/OFF
–0.75
25°C
IL = 1 mA
MIN
25°C
–40°C to 125°C
IL = 0
LP2981-xx
MAX
25°C
25°C
IL = 100 mA
IGND
TYP
–40°C to 125°C
IL = 25 mA
Ground pin
current
LP2981A-xx
MIN
25°C
IL = 0
VIN – VOUT
TA
µA
15
400
400
mA
25°C
160
160
µV
f = 1 kHz, COUT = 10 µF
25°C
63
63
dB
RL = 0 (steady state)
25°C
150
150
mA
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.
The ON/OFF input must be actively terminated. Connect to VIN if this function is not used (see Application Information).
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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
ESR − Ω
ESR − Ω
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 3. 5-V/10-µF ESR Curves
ESR − Ω
ESR − Ω
Figure 2. 5-V/3.3-µF ESR Curves
Load Current − mA
Load Current − mA
Figure 4. 3-V/3.3-µF ESR Curves
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Figure 5. 3-V/10-µF ESR Curves
5
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.
VIN
VOUT
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
VIN
VOUT
LP2981
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7
PACKAGE OPTION ADDENDUM
www.ti.com
29-May-2007
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
LP2981-29DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-29DBVRG4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-29DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-29DBVTG4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-50DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-50DBVRG4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-50DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-50DBVTG4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-29DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-29DBVRG4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-29DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-29DBVTG4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-50DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-50DBVRG4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-50DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-50DBVTG4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
Lead/Ball Finish
MSL Peak Temp (3)
(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
Device
9-Jun-2007
Package Pins
Site
Reel
Diameter
(mm)
Reel
Width
(mm)
A0 (mm)
B0 (mm)
K0 (mm)
P1
(mm)
W
Pin1
(mm) Quadrant
LP2981-29DBVR
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981-29DBVT
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981-50DBVR
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981-50DBVT
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981A-29DBVR
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981A-29DBVT
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981A-50DBVR
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
LP2981A-50DBVT
DBV
5
LEN
180
9
3.15
3.2
1.4
4
8
Q3
TAPE AND REEL BOX INFORMATION
Device
Package
Pins
Site
Length (mm)
Width (mm)
Height (mm)
LP2981-29DBVR
DBV
5
LEN
182.0
182.0
20.0
LP2981-29DBVT
DBV
5
LEN
182.0
182.0
20.0
LP2981-50DBVR
DBV
5
LEN
182.0
182.0
20.0
LP2981-50DBVT
DBV
5
LEN
182.0
182.0
20.0
LP2981A-29DBVR
DBV
5
LEN
182.0
182.0
20.0
LP2981A-29DBVT
DBV
5
LEN
182.0
182.0
20.0
LP2981A-50DBVR
DBV
5
LEN
182.0
182.0
20.0
LP2981A-50DBVT
DBV
5
LEN
182.0
182.0
20.0
Pack Materials-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
9-Jun-2007
Pack Materials-Page 3
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Telephony
www.ti.com/telephony
Low Power
Wireless
www.ti.com/lpw
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
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