LP2982AIM5X-3.0/NOPB [NSC]
IC VREG 3 V FIXED POSITIVE LDO REGULATOR, 0.225 V DROPOUT, PDSO5, SOT-23, 5 PIN, Fixed Positive Single Output LDO Regulator;
| 型号： | LP2982AIM5X-3.0/NOPB |
| 厂家： | 
National Semiconductor |
| 描述： | IC VREG 3 V FIXED POSITIVE LDO REGULATOR, 0.225 V DROPOUT, PDSO5, SOT-23, 5 PIN, Fixed Positive Single Output LDO Regulator 光电二极管 |
| 文件： | 总14页 (文件大小：376K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
January 14, 2009
LP2982
Micropower 50 mA Ultra Low-Dropout Regulator in SOT-23
Package
General Description
The LP2982 is a 50 mA, fixed-output voltage regulator de-
signed to provide ultra low dropout and lower noise in battery
powered applications.
Using an optimized VIP® (Vertically Integrated PNP) process,
the LP2982 delivers unequaled performance in all specifica-
tions critical to battery-powered designs:
Features
Ultra low dropout voltage
■
■
■
■
Guaranteed 50 mA output current
Typical dropout voltage 180 mV @ 80 mA
Requires minimum external components
< 1 μA quiescent current when shutdown
Low ground pin current at all loads
■
■
■
■
■
■
■
■
Dropout Voltage: Typically 120 mV @ 50 mA load, and 7 mV
@ 1 mA load.
Output voltage accuracy 1.0% (A Grade)
High peak current capability (150 mA typical)
Wide supply voltage range (16V max)
Low ZOUT 0.3Ω typical (10 Hz to 1 MHz)
Over-Temperature/Over-Current protection
−40°C to +125°C junction temperature range
Ground Pin Current: Typically 375 μA @ 50 mA load, and
80 μA @ 1 mA load.
Sleep Mode: Less than 1 μA quiescent current when on/off
pin is pulled low.
Precision Output: 1.0% tolerance output voltages available
(A grade).
Low Noise: By adding an external bypass capacitor, output
noise can be reduced to 30 μV (typical).
Four output voltage versions, from 3.0V to 5.0V, are available
as standard products.
Applications
Cellular Phone
■
■
■
Palmtop/Laptop Computer
Personal Digital Assistant (PDA)
Camcorder, Personal Stereo, Camera
■
Block Diagram
1267901
VIP® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation
12679
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Connection Diagram
5-Lead Small Outline Package (SOT-23)
1267903
Top View
See NS Package Number MF05A
ꢀ
Pin Descriptions
Pin
Number
Name
Function
VIN
1
2
3
4
5
Input Voltage
GND
Common Ground (device substrate)
Logic high enable input
ON/OFF
BYPASS
VOUT
Bypass capacitor for low noise operation
Regulated output voltage
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output
Grade
Order Information
Package Marking Supplied as:
Voltage (V)
LP2982AIM5X-3.0
LP2982AIM5-3.0
LP2982IM5X-3.0
LP2982IM5-3.0
LP2982AIM5X-3.3
LP2982AIM5-3.3
LP2982IM5X-3.3
LP2982IM5-3.3
LP2982AIM5X-3.8
LP2982AIM5-3.8
LP2982IM5-3.8
LP2982AIM5X-5.0
LP2982AIM5-5.0
LP2982IM5X-5.0
LP2982IM5-5.0
L20A
L20A
L20B
L20B
L19A
L19A
L19B
L19B
L76A
L76A
L76B
L18A
L18A
L18B
L18B
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
A
3.0
STD
A
3.3
STD
A
3.8
STD
A
5.0
STD
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2
Power Dissipation (Note 3)
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
Shutdown Input Voltage (Survival)
Output Voltage (Survival, (Note 4))
IOUT (Survival)
Internally Limited
−0.3V to +16V
2.1V to +16V
−0.3V to +16V
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
−0.3V to +9V
Storage Temperature Range
−65°C to +150°C
Short Circuit Protected
Operating Junction Temperature Range −40°C to +125°C
Input-Output Voltage (Survival, (Note 5))
−0.3V to +16V
Lead Temperature (Soldering, 5 sec.)
ESD Rating (Note 2)
260°C
2 kV
Electrical Characteristics
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless
otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 μF, COUT = 4.7 μF, VON/OFF = 2V.
Symbol
Parameter
Conditions
Typ
LP2982AI-X.X
LP2982I-X.X
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
Output Voltage Tolerance
IL = 1 mA
−1.0
+1.0
−1.5
+1.5
ΔVO
%VNOM
%/V
1 mA < IL < 50 mA
−1.5
+1.5
+2.0
−2.0
+2.0
+3.5
−2.0
−3.5
Output Voltage Line
Regulation
0.007
0.014
0.014
VO(NOM) + 1V ≤ VIN ≤ 16V
IL = 0
0.032
0.032
VIN–VO
Dropout Voltage
(Note 7)
3
5
3
5
1
IL = 1 mA
10
10
7
15
15
mV
IL = 10 mA
IL = 50 mA
IL = 0
60
60
40
90
90
150
225
95
150
225
95
120
65
IGND
Ground Pin Current
125
110
170
220
460
600
1200
0.8
2.0
125
110
170
220
460
600
1200
0.8
2.0
IL = 1 mA
80
IL = 10 mA
IL = 50 mA
140
375
μA
VON/OFF < 0.3V
VON/OFF < 0.15V
High = O/P ON
Low = O/P OFF
VON/OFF = 0
0.01
0.10
1.4
VON/OFF
ON/OFF Input Voltage
(Note 8)
1.6
1.6
V
0.55
0.01
5
0.15
−2
0.15
−2
ION/OFF
ON/OFF Input Current
μA
VON/OFF = 5V
15
15
IO(PK)
Peak Output Current
Dropout Voltage
150
100
100
mA
mV
VOUT ≥ VO(NOM) − 5%
IL = 80 mA
VIN–VO
180
225
325
225
325
IGND
Ground Pin Current
IL = 80 mA
525
750
750
μA
μV
1400
1400
en
Output Noise Voltage
(RMS)
BW = 300 Hz–50 kHz,
COUT = 10 μF
30
CBYPASS = 0.01 μF
3
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Symbol
Parameter
Conditions
Typ
LP2982AI-X.X
LP2982I-X.X
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
Ripple Rejection
f = 1 kHz
45
dB
COUT = 10 μF
IO(MAX)
Short Circuit Current
RL = 0 (Steady State)
(Note 9)
150
mA
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the
device outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 for the SOT-23 package, or pins 5 and 2 for the micro SMD package, is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA
,
and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of θJA for the SOT-23 package is 220°C/W. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator
will go into thermal shutdown.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2982 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to
VOUT will turn on this diode. (See REVERSE CURRENT PATH.)
Note 6: Temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's
Average Outgoing Quality Level (AOQL).
Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.
Note 8: The ON/OFF inputs must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 9: See Typical Performance Characteristics curve(s).
Typical Application Circuit
1267902
*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.
**Minimum capacitance is shown to insure stability over full load current range. More capacitance provides superior dynamic performance (see Application Hints).
***See Application Hints.
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4
Typical Performance Characteristics Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V,
COUT = 4.7 μF, CIN = 1 μF, all voltage options, ON/OFF pin tied to VIN.
Output Voltage vs
Temperature
Output Voltage vs
Temperature
1267905
1267904
Output Voltage vs
Temparature
Dropout Characteristics
ꢀ
1267907
1267906
Dropout Characteristics
Dropout Characteristics
ꢀ
ꢀ
1267909
1267908
5
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Dropout Voltage vs
Temperature
Dropout Voltage vs
Load Current
1267910
1267911
Ground Pin Current vs
Temperature
Ground Pin Current vs
Load Current
1267913
1267912
Input Current vs VIN
Input Current vs VIN
ꢀ
ꢀ
1267915
1267914
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Line Transient Response
Line Transient Response
ꢀ
ꢀ
1267916
1267917
Load Transient Response
Load Transient Response
ꢀ
ꢀ
1267918
1267919
Load Transient Response
Load Transient Response
ꢀ
ꢀ
1267920
1267921
7
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Short Circuit Current
Instantaneous Short Circuit
Current vs Temperature
ꢀ
1267922
1267923
Short Circuit Current
Instantaneous Short Circuit
Current vs Output Voltage
ꢀ
1267924
1267925
Output Impedance vs
Frequency
Output Impedance vs
Frequency
1267926
1267929
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ON/OFF Pin Current vs
VON/OFF
ON/OFF Threshold vs
Temperature
1267935
1267934
Input to Output Leakage vs
Temperature
Output Reverse Leakage vs
Temperature
1267930
1267931
Output Noise Density
Output Noise Density
ꢀ
ꢀ
1267948
1267942
9
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Output Noise Density
Ripple Rejection
ꢀ
ꢀ
1267949
1267941
Turn-ON Waveform
Turn-ON Waveform
ꢀ
ꢀ
1267951
1267950
Turn-ON Waveform
ꢀ
1267952
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10
perature range, which is more difficult because of their large
increase in ESR at cold temperature.
Application Hints
An aluminum electrolytic can exhibit an ESR increase of as
much as 50X when going from 20°C to −40°C. Also, some
aluminum electrolytic are not operational below −25°C be-
cause the electrolyte can freeze.
EXTERNAL CAPACITORS
Like any low-dropout regulator, the external capacitors used
with the LP2982 must be carefully selected to assure regula-
tor loop stability.
Input Capacitor: An input capacitor whose value is ≥ 1 μF is
required with the LP2982 (amount of capacitance can be in-
creased without limit).
This capacitor must be located a distance of not more than
0.5″ from the input pin of the LP2982 and returned to a clean
analog ground. Any good quality ceramic or tantalum can be
used for this capacitor.
Output Capacitor: The output capacitor must meet both the
requirement for minimum amount of capacitance and E.S.R.
(equivalent series resistance) value. Curves are provided
which show the allowable ESR range as a function of load
current for various output voltages and capacitor values (refer
to Figure 1, Figure 2).
Important: The output capacitor must maintain its ESR in the
stable region over the full operating temperature to assure
stability. Also, capacitor tolerance and variation with temper-
ature must be considered to assure the minimum amount of
capacitance is provided at all times.
1267943
FIGURE 1. 5V/2.2 μF ESR Curves
This capacitor should be located not more than 0.5″ from the
output pin of the LP2982 and returned to a clean analog
ground.
Low-current Operation: In applications where the load cur-
rent is < 1 mA, special consideration must be given to the
output capacitor.
Circuitry inside the LP2982 is specially designed to reduce
operating (quiescent) current at light loads down to about
65 μA.
The mode of operation which yields this very low quiescent
current also means that the output capacitor ESR is critical.
For optimum stability and minimum output noise, it is recom-
mended that a 10Ω resistor be placed in series with the output
capacitor in any applications where IL < 1 mA.
CAPACITOR CHARACTERISTICS
1267944
Tantalum: Tantalum capacitors are the best choice for use
with the LP2982. Most good quality tantalum can be used with
the LP2982, but check the manufacturer's data sheet to be
sure the ESR is in range.
FIGURE 2. 3V/4.7 μF ESR Curves
BYPASS CAPACITOR
It is important to remember that ESR increases sharply at
lower temperatures (< 10°C) and a capacitor that is near the
upper limit for stability at room temperature can cause insta-
bility when it gets cold.
The 0.01 μF capacitor connected to the bypass pin to reduce
noise must have very low leakage.
The current flowing out of the bypass pin comes from the
bandgap reference, which is used to set the output voltage.
In applications which must operate at very low temperatures,
it may be necessary to parallel the output tantalum capacitor
with a ceramic capacitor to prevent the ESR from going up
too high (see next section for important information on ce-
ramic capacitors).
This capacitor leakage current causes the output voltage to
decline by an amount proportional to the current. Typical val-
ues are −0.015%/nA @ −40°C, −0.021%/nA @ 25°C, and
−0.035%/nA @ +125°C.
Ceramic: Ceramic capacitors are not recommended for use
at the output of the LP2982. This is because the ESR of a
ceramic can be low enough to go below the minimum stable
value for the LP2982. A good 2.2 μF ceramic was measured
and found to have an ESR of about 15 mΩ, which is low
enough to cause oscillations.
This data is valid up to a maximum leakage current of about
500 nA, beyond which the bandgap is so severely loaded that
it can not function.
Care must be taken to ensure that the capacitor selected will
not have excessive leakage current over the operating tem-
perature range of the application.
If a ceramic capacitor is used on the output, a 1Ω resistor
should be placed in series with the capacitor.
A high quality ceramic capacitor which uses either NPO or
COG type dielectric material will typically have very low leak-
age. Small surface mount polypropylene or polycarbonate
film capacitors also have extremely low leakage, but are
slightly larger than ceramics.
Aluminum: Because of large physical size, aluminum elec-
trolytic are not typically used with the LP2982. They must
meet the same ESR requirements over the operating tem-
11
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REVERSE CURRENT PATH
ON/OFF INPUT OPERATION
The internal PNP power transistor used as the pass element
in the LP2982 has an inherent diode connected between the
regulator output and input. During normal operation (where
the input voltage is higher than the output) this diode is re-
verse biased (See Figure 3).
The LP2982 is shut off by pulling the ON/OFF input low, and
turned on by driving the input high. If this feature is not to be
used, the ON/OFF input should be tied to VIN to keep the reg-
ulator on at all times (the ON/OFF input must not be left
floating).
To ensure proper operation, the signal source used to drive
the ON/OFF input must be able to swing above and below the
specified turn-on/turn-off voltage thresholds which guarantee
an ON or OFF state (see Electrical Characteristics).
The ON/OFF signal may come from either a totem-pole out-
put, or an open-collector output with pull-up resistor to the
LP2982 input voltage or another logic supply. The high-level
voltage may exceed the LP2982 input voltage, but must re-
main within the Absolute Maximum Ratings for the ON/OFF
pin.
It is also important that the turn-on/turn-off voltage signals
applied to the ON/OFF input have a slew rate which is greater
than 40 mV/μs.
1267939
FIGURE 3. LP2982 Reverse Current Path
IMPORTANT: the regulator shutdown function will not oper-
ate correctly if a slow-moving signal is applied to the ON/OFF
input.
However, if the input voltage is more than a VBE below the
output voltage, this diode will turn ON and current will flow into
the regulator output. In such cases, a parasitic SCR can latch
which will allow a high current to flow into the VIN pin and out
the ground pin, which can damage the part.
The internal diode can also be turned on if the input voltage
is abruptly stepped down to a voltage which is a VBE below
the output voltage.
In any application where the output voltage may be higher
than the input voltage, an external Schottky diode must be
connected from VIN to VOUT (cathode on VIN, anode on
VOUT. See Figure 4), to limit the reverse voltage across the
LP2982 to 0.3V (see Absolute Maximum Ratings).
1267940
FIGURE 4. Adding External Schottky Diode Protection
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12
Physical Dimensions inches (millimeters) unless otherwise noted
5-Lead Small Outline Package (SOT-23)
NS Package Number MF05A
For Order Numbers, refer to Table 1in the “Ordering Information” section of this document.
13
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相关型号：
LP2982AIM5X-3.3/NOPB
IC VREG 3.3 V FIXED POSITIVE LDO REGULATOR, 0.225 V DROPOUT, PDSO5, SOT-23, 5 PIN, Fixed Positive Single Output LDO Regulator
NSC
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