TI LP2981A

LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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 2.8 V, 3 V, 3.3 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.
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 © 2004–2005, Texas Instruments Incorporated
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
ORDERING INFORMATION
TJ
PART GRADE
VOUT
(NOM)
PACKAGE (1)
2.8 V
3V
A grade:
0.75% tolerance
3.3 V
5V
–40°C to 125°C
SOT-23-5 – DBV
2.8 V
3V
Standard grade:
1.25% tolerance
3.3 V
5V
(1)
(2)
2
ORDERABLE
PART NUMBER
Reel of 3000
LP2981A-28DBVR
Reel of 250
LP2981A-28DBVT
Reel of 3000
LP2981A-30DBVR
Reel of 250
LP2981A-30DBVT
Reel of 3000
LP2981A-33DBVR
Reel of 250
LP2981A-33DBVT
Reel of 3000
LP2981A-50DBVR
Reel of 250
LP2981A-50DBVT
Reel of 3000
LP2981-28DBVR
Reel of 250
LP2981-28DBVT
Reel of 3000
LP2981-30DBVR
Reel of 250
LP2981-30DBVT
Reel of 3000
LP2981-33DBVR
Reel of 250
LP2981-33DBVT
Reel of 3000
LP2981-50DBVR
Reel of 250
LP2981-50DBVT
TOP-SIDE
MARKING (2)
LP6_
LP8_
LPC_
PREVIEW
LP5_
LP7_
LPB_
PREVIEW
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.
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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
NC
(see Note C)
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.
3
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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)
4
Minimum VIN of 2.2 V is needed for proper biasing of LDO control circuitry.
MIN
MAX
2.2 (1)
16
V
0
VIN
V
0.7
11
V
100
mA
125
°C
–40
UNIT
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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
IL = 0
VIN – VOUT
Dropout
voltage (1)
IL = 1 mA
IL = 25 mA
IL = 100 mA
IL = 0
IL = 1 mA
IGND
Ground pin
current
IL = 25 mA
IL = 100 mA
VON/OFF < 0.3 V (OFF)
VON/OFF < 0.15 V (OFF)
High = O/P ON
VON/OFF
ON/OFF input
voltage (2)
Low = O/P OFF
ION/OFF
ON/OFF input
current
VON/OFF = 0
VON/OFF = 5 V
TA
LP2981-xx
MAX
MIN
–0.75
0.75
–1.25
25°C
–1
1
–2
2.5
–3.5
–40°C to 125°C
–2.5
25°C
0.007
–40°C to 125°C
0.014
TYP
25°C
1
3.5
0.007
7
10
70
100
–40°C to 125°C
1
3
7
10
70
100
–40°C to 125°C
15
150
25°C
200
–40°C to 125°C
65
–40°C to 125°C
200
25°C
80
65
200
–40°C to 125°C
110
80
600
–40°C to 125°C
110
170
300
200
550
25°C
95
125
170
25°C
250
375
95
125
–40°C to 125°C
300
550
800
600
1500
1500
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
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
Vn
0.15
–1
25°C
–1
5
15
150
V
0.5
0.15
–40°C to 125°C
25°C
1.4
1.6
–40°C to 125°C
VOUT ≥ VOUT(NOM) – 5%
5
1.4
25°C
µA
800
25°C
–40°C to 125°C
mV
150
250
375
25°C
%/V
5
15
25°C
0.014
0.032
3
UNIT
2 %VNOM
5
25°C
MAX
1.25
0.032
–40°C to 125°C
Peak output
current
(2)
TYP
25°C
IOUT(PK)
(1)
LP2981A-xx
MIN
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).
5
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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 Figures 1–4).
• 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
Load Current − mA
Figure 4. 3-V/3.3-µF ESR Curves
6
Figure 3. 5-V/10-µF ESR Curves
ESR − Ω
ESR − Ω
Figure 2. 5-V/3.3-µF ESR Curves
Load Current − mA
Figure 5. 3-V/10-µF ESR Curves
www.ti.com
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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.
7
LP2981
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
www.ti.com
SLVS521C – JULY 2004 – REVISED AUGUST 2005
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
8
PACKAGE OPTION ADDENDUM
www.ti.com
18-Jul-2006
PACKAGING INFORMATION
(1)
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
LP2981-28DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-28DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-28DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-28DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-30DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-30DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-30DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-30DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-33DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-33DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-33DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981-33DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-28DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-28DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-28DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-28DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-30DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-30DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-30DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-30DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-33DBVR
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-33DBVRE4
ACTIVE
SOT-23
DBV
5
3000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-33DBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
LP2981A-33DBVTE4
ACTIVE
SOT-23
DBV
5
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
The marketing status values are defined as follows:
Addendum-Page 1
Lead/Ball Finish
MSL Peak Temp (3)
PACKAGE OPTION ADDENDUM
www.ti.com
18-Jul-2006
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)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 2
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