LP2981AIM5X-3.2 [NSC]
Micropower 100 mA Ultra Low-Dropout Regulator; 微百毫安超低压差稳压器
| 型号： | LP2981AIM5X-3.2 |
| 厂家： | 
National Semiconductor |
| 描述： | Micropower 100 mA Ultra Low-Dropout Regulator |
| 文件： | 总16页 (文件大小：409K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2000
LP2981
Micropower 100 mA Ultra Low-Dropout Regulator
General Description
The LP2981 is a 100 mA, fixed-output voltage regulator de-
signed specifically to meet the requirements of
battery-powered applications.
Features
n Ultra low dropout voltage
n Output voltage accuracy 0.75% (A Grade)
n Guaranteed 100 mA output current
™
Using an optimized VIP (Vertically Integrated PNP) pro-
n Smallest possible size (SOT-23, micro SMD package)
cess, the LP2981 delivers unequaled performance in all
specifications critical to battery-powered designs:
<
n
1 µA quiescent current when shutdown
n Low ground pin current at all load currents
n High peak current capability (300 mA typical)
n Wide supply voltage range (16V max)
n Fast dynamic response to line and load
n Low ZOUT over wide frequency range
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
@
Dropout Voltage. Typically 200 mV
100 mA load, and
@
7 mV 1 mA load.
@
Ground Pin Current. Typically 600 µA 100 mA load, and
@
80 µA 1 mA load.
Sleep Mode. Less than 1 µA quiescent current when ON/
OFF pin is pulled low.
Smallest Possible Size. SOT-23and micro SMD packages
use an absolute minimum board space.
Applications
Precision Output. 0.75% tolerance output voltages avail-
able (A grade).
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Eleven voltage options, from 2.5V to 5.0V, are available as
standard products.
Block Diagram
DS012506-1
™
VIP is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS012506
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Connection Diagrams
5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package (BPA05)
DS012506-50
DS012506-2
Bottom View
See NS Package Number BPA05
Top View
See NS Package Number MF05A
For ordering information see Table 1
Ordering Information
TABLE 1. Package Marking and Order Information
Output Voltage
(V)
Grade
Order Information
Package
Marking
Supplied as:
5-Lead Small Outline Package (M5)
2.5
2.5
2.5
2.5
2.7
2.7
2.7
2.7
2.8
2.8
2.8
2.8
2.9
2.9
2.9
2.9
3.0
3.0
3.0
3.0
3.1
3.1
3.1
3.1
3.2
3.2
3.2
3.2
3.3
3.3
3.3
3.3
A
A
LP2981AIM5X-2.5
LP2981AIM5-2.5
LP2981IM5X-2.5
LP2981IM5-2.5
LP2981AIM5X-2.7
LP2981AIM5-2.7
LP2981IM5X-2.7
LP2981IM5-2.7
LP2981AIM5X-2.8
LP2981AIM5-2.8
LP2981IM5X-2.8
LP2981IM5-2.8
LP2981AIM5X-2.9
LP2981AIM5-2.9
LP2981IM5X-2.9
LP2981IM5-2.9
LP2981AIM5X-3.0
LP2981AIM5-3.0
LP2981IM5X-3.0
LP2981IM5-3.0
LP2981AIM5X-3.1
LP2981AIM5-3.1
LP2981IM5X-3.1
LP2981IM5-3.1
LP2981AIM5X-3.2
LP2981AIM5-3.2
LP2981IM5X-3.2
LP2981IM5-3.2
LP2981AIM5X-3.3
LP2981AIM5-3.3
LP2981IM5X-3.3
LP2981IM5-3.3
L0CA
L0CA
L0CB
L0CB
L0DA
L0DA
L0DB
L0DB
L77A
L77A
L77B
L77B
L0VA
L0VA
L0VB
L0VB
L05A
L05A
L05B
L05B
L38A
L38A
L38B
L38B
L35A
L35A
L35B
L35B
L04A
L04A
L04B
L04B
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
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
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
3000 Units on Tape and Reel
1000 Units on Tape and Reel
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
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2
Ordering Information (Continued)
TABLE 1. Package Marking and Order Information (Continued)
Output Voltage
(V)
Grade
Order Information
Package
Marking
Supplied as:
5-Lead Small Outline Package (M5)
3.6
3.6
3.6
3.6
3.8
3.8
3.8
3.8
4.0
4.0
4.0
4.0
4.7
4.7
4.7
4.7
5.0
5.0
5.0
5.0
A
A
LP2981AIM5X-3.6
LP2981AIM5-3.6
LP2981IM5X-3.6
LP2981IM5-3.6
LP2981AIM5X-3.8
LP2981AIM5-3.8
LP2981IM5X-3.8
LP2981IM5-3.8
LP2981AIM5X-4.0
LP2981AIM5-4.0
LP2981IM5X-4.0
LP2981IM5-4.0
LP2981AIM5X-4.7
LP2981AIM5-4.7
LP2981IM5X-4.7
LP2981IM5-4.7
LP2981AIM5X-5.0
LP2981AIM5-5.0
LP2981IM5X-5.0
LP2981IM5-5.0
L0JA
L0JA
L0JB
L0JB
L36A
L36A
L36B
L36B
L0ZA
L0ZA
L0ZB
L0ZB
L0GA
L0GA
L0GB
L0GB
L03A
L03A
L03B
L03B
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
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
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
A
A
STD
STD
micro SMD, 5 Bump Package (BPA05)
2.5
2.5
2.5
2.5
3.2
3.2
3.2
3.2
3.3
3.3
3.3
3.3
A
A
LP2981AIBP-2.5
LP2981AIBPX-2.5
LP2981IBP-2.5
LP2981IBPX-2.5
LP2981AIBP-3.2
LP2981AIBPX-3.2
LP2981IBP-3.2
LP2981IBPX-3.2
LP2981AIBP-3.3
LP2981AIBPX-3.3
LP2981IBP-3.3
LP2981IBPX-3.3
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
STD
STD
A
A
STD
STD
A
A
STD
STD
3
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
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
−0.3V to +9V
Storage Temperature Range
−65˚C to +150˚C
−40˚C to +125˚C
Short Circuit Protected
Operating Junction Temperature
Range
Input-Output Voltage
(Survival, (Note 5))
−0.3V to +16V
Lead Temperature
(Soldering, 5 sec.)
260˚C
2 kV
ESD Rating (Note 2)
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type applyover the full operating temperature range. Un-
less otherwise specified: VIN = VO(NOM) + 1V, CIN = 1 µF, IL = 1 mA, COUT = 4.7 µF,VON/OFF = 2V.
Symbol
Parameter
Conditions
Typ
LP2981AI-XX
LP2981I-XX
Units
(Note 6)
(Note 6)
Min
Max
Min
Max
∆VO
Output Voltage
Tolerance
IL = 1mA
−0.75
0.75
−1.25
1.25
%VNOM
<
<
1 mA IL 100 mA
−1.0
1.0
2.5
−2.0
2.0
3.5
−2.5
−3.5
Output Voltage
Line Regulation
VO(NOM) + 1V
≤ VIN ≤ 16V
IL = 0
0.007
0.014
0.014
%/V
mV
0.032
0.032
VIN–VO
Dropout Voltage
(Note 7)
1
3
5
3
5
IL = 1 mA
IL = 25 mA
IL = 100 mA
IL = 0
7
10
10
15
15
70
100
150
250
375
95
100
150
250
375
95
200
65
IGND
Ground Pin Current
µA
125
110
170
300
550
800
1500
0.8
2
125
110
170
300
550
800
1500
0.8
2
IL = 1 mA
IL = 25 mA
IL = 100 mA
80
200
600
<
VON/OFF 0.3V
0.01
0.05
1.4
<
VON/OFF 0.15V
VON/OFF
ON/OFF Input Voltage
(Note 8)
High = O/P ON
Low = O/P OFF
VON/OFF = 0
1.6
1.6
V
0.50
0.01
5
0.15
−1
0.15
−1
ION/OFF
ON/OFF Input Current
µA
VON/OFF = 5V
15
15
IO(PK)
en
Peak Output Current
Output Noise
VOUT ≥ VO(NOM) − 5%
BW = 300 Hz–50 kHz,
COUT = 10 µF
400
160
150
150
mA
µV
Voltage (RMS)
Ripple Rejection
f = 1 kHz
63
dB
COUT = 10 µF
IO(MAX)
Short Circuit Current
RL = 0 (Steady State)
(Note 9)
150
mA
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4
Electrical Characteristics (Continued)
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 2: The ESD rating of pins 3 and 4 is 1 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T
, the junction-to-ambient thermal resistance, θ , and
JA
J(MAX)
the ambient temperature, T . The maximum allowable power dissipation at any ambient temperature is calculated using:
A
The value of θ for the SOT-23 package is 220˚C/W and the micro SMD package is 320˚C/W. Exceeding the maximum allowable power dissipation will cause ex-
JA
cessive 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 LP2981 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the V and V
terminals that is normally reverse-biased. Reversing the polarity from V to V
IN OUT
IN
OUT
will turn on this diode (see Application Hints).
Note 6: Limits are 100% production tested at 25˚C. Limits over the operating 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 misoperation. For details, refer to Application Hints.
Note 9: See Typical Performance Characteristics curves.
Basic Application Circuit
DS012506-4
*
ON/OFF input must be actively terminated. Tie to V if this function is not to be used.
IN
**
Minimum Output Capacitance is shown to insure stability over full load current range. More capacitance provides superior dynamic performance and
additional stability margin (see Application Hints).
***
Do not make connections to this pin.
5
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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
DS012506-7
DS012506-6
Output Voltage vs
Temperature
Dropout Characteristics
DS012506-9
DS012506-8
Dropout Characteristics
Dropout Characteristics
DS012506-11
DS012506-10
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6
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. (Continued)
Dropout Voltage vs
Temperature
Dropout Voltage vs
Load Current
DS012506-12
DS012506-13
Ground Pin Current vs
Temperature
Ground Pin Current vs
Load Current
DS012506-14
DS012506-15
Input Current vs VIN
Input Current vs VIN
DS012506-17
DS012506-16
7
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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. (Continued)
Line Transient Response
Load Transient Response
Load Transient Response
Line Transient Response
Load Transient Response
Load Transient Response
DS012506-18
DS012506-19
DS012506-21
DS012506-20
DS012506-22
DS012506-23
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8
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. (Continued)
Short Circuit Current
Instantaneous Short Circuit
Current vs Temperature
DS012506-24
DS012506-25
DS012506-27
DS012506-29
Short Circuit Current
Instantaneous Short Circuit
Current vs Output Voltage
DS012506-26
Output Impedance vs
Frequency
Ripple Rejection
DS012506-28
9
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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. (Continued)
Output Noise Density
Output Impedance vs
Frequency
DS012506-30
DS012506-31
Input to Output Leakage
vs Temperature
Output Reverse Leakage vs
Temperature
DS012506-32
DS012506-33
Turn-On Waveform
Turn-Off Waveform
DS012506-34
DS012506-35
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10
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. (Continued)
ON/OFF Pin Current vs
VON/OFF
ON/OFF Threshold
vs Temperature
DS012506-37
DS012506-36
CERAMIC: Ceramic capacitors are not recommended for
use at the output of the LP2981. This is because the ESR of
a ceramic can be low enough to go below the minimum
stable value for the LP2981. A 2.2 µF ceramic was measured
and found to have an ESR of about 15 mΩ, which is low
enough to cause oscillations.
Application Hints
EXTERNAL CAPACITORS
Like any low-dropout regulator, the external capacitors used
with the LP2981 must be carefully selected to assure regula-
tor loop stability.
If a ceramic capacitor is used on the output, a 1Ω resistor
should be placed in series with the capacitor.
INPUT CAPACITOR: An input capacitor whose value is
≥ 1 µF is required with the LP2981 (amount of capacitance
can be increased without limit).
ALUMINUM: Because of large physical size, aluminum elec-
trolytics are not typically used with the LP2981. They must
meet the same ESR requirements over the operating tem-
perature range, more difficult because of their steep increase
at cold temperature.
This capacitor must be located a distance of not more than
0.5" from the input pin of the LP2981 and returned to a clean
analog ground. Any good quality ceramic or tantalum can be
used for this capacitor.
An aluminum electrolytic can exhibit an ESR increase of as
much as 50X when going from 20˚C to −40˚C. Also, some
aluminum electrolytics are not operational below −25˚C be-
cause the electrolyte can freeze.
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 val-
ues (refer to Figures 1, 2, 3, 4).
IMPORTANT: The output capacitor must maintain its ESR in
the stable region over the full operating temperature range to
assure stability. Also, capacitor tolerance and variation with
temperature must be considered to assure the minimum
amount of capacitance is provided at all times.
This capacitor should be located not more than 0.5" from the
output pin of the LP2981 and returned to a clean analog
ground.
CAPACITOR CHARACTERISTICS
TANTALUM: Tantalum capacitors are the best choice for
use with the LP2981. Most good quality tantalums can be
used with the LP2981, but check the manufacturer’s data
sheet to be sure the ESR is in range.
DS012506-38
FIGURE 1. 5V/3.3 µF ESR Curves
It is important to remember that ESR increases at lower tem-
peratures and a capacitor that is near the upper limit for sta-
bility at room temperature can cause instability when it gets
cold.
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).
11
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Application Hints (Continued)
DS012506-41
If the output is forced above the input by more than a VBE
,
this diode will become forward biased and current will flow
from the VOUT terminal to VIN
.
<
This current must be limited to 100 mA to prevent damage
to the part.
The internal diode can also be turned on by abruptly step-
ping the input voltage to a value below the output voltage.
To prevent regulator mis-operation, a Schottky diode should
be used in any application where input/output voltage condi-
tions can cause the internal diode to be turned on (see be-
low).
DS012506-39
FIGURE 2. 5V/10 µF ESR Curves
DS012506-43
As shown, the Schottky diode is connected in parallel with
the internal parasitic diode and prevents it from being turned
on by limiting the voltage drop across it to about 0.3V.
ON/OFF INPUT OPERATION
DS012506-40
The LP2981 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
regulator on at all times (the ON/OFF input must not be left
floating).
FIGURE 3. 3V/3.3 µF ESR Curves
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 guar-
antee 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
LP2981 input voltage or another logic supply. The high-level
voltage may exceed the LP2981 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.
DS012506-42
Important: the regulator shutdown function will operate incor-
rectly if a slow-moving signal is applied to the ON/OFF input.
FIGURE 4. 3V/10 µF ESR Curves
Micro SMD Mounting
REVERSE CURRENT PATH
The micro SMD package requires specific mounting tech-
niques which are detailed in National Semiconductor Appli-
cation Note # 1112. Referring to the section Surface Mount
Technology (SMT) Assembly Considerations, it should be
noted that the pad style which must be used with the 5-pin
package is the NSMD (non-solder mask defined) type.
The power transistor used in the LP2981 has an inherent di-
ode connected between the regulator input and output (see
below).
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12
The wavelenghts which have the most detrimental effect are
reds and infra-reds, which means that the fluorescent light-
ing used inside most buildings has very little effect on perfor-
mance. A micro SMD test board was brought to within 1 cm
of a fluorescent desk lamp and the effect on the regulated
output voltage was negligible, showing a deviation of less
than 0.1% from nominal.
Application Hints (Continued)
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
Micro SMD Light Sensitivity
Exposing the micro SMD device to direct sunlight will cause
misoperation of the device. Light sources such as Halogen
lamps can also affect electrical performance if brought near
to the device.
13
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Physical Dimensions inches (millimeters) unless otherwise noted
5-Lead Small Outline Package (M5)
NS Package Number MF05A
For Order Numbers, refer to Table 1 in the “Ordering Information” section of this document.
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14
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE
NUMBERED COUNTER CLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACK-
AGE LENGTH AND X3 IS PACKAGE HEIGHT.
6.NO JEDEC REGISTRATION AS OF AUG.1999.
micro SMD, 5 Bump Package (BPA05)
NS Package Number BPA05A
For Order Numbers, refer to Table 1 in the “Order Information” section of this document.
The dimensions for X1, X2 and X3 are as given:
X1 = 0.930 +/− 0.030mm
X2 = 1.107 +/− 0.030mm
X3 = 0.850 +/− 0.050mm
15
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Notes
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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