LP2986AIMX-5.0 [NSC]
Micropower, 200 mA Ultra Low-Dropout Fixed or Adjustable Voltage Regulator; 微功耗， 200毫安超低压差固定或可调稳压器
| 型号： | LP2986AIMX-5.0 |
| 厂家： | 
National Semiconductor |
| 描述： | Micropower, 200 mA Ultra Low-Dropout Fixed or Adjustable Voltage Regulator |
| 文件： | 总14页 (文件大小：415K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 1999
LP2986
Micropower, 200 mA Ultra Low-Dropout Fixed or
Adjustable Voltage Regulator
General Description
The LP2986 is a 200 mA precision LDO voltage regulator
which offers the designer a higher performance version of
the industry standard LP2951.
Features
n Ultra low dropout voltage
n Guaranteed 200 mA output current
n SO-8 and mini-SO8 surface mount packages
™
<
Using an optimized VIP (Vertically Integrated PNP) pro-
n
1 µA quiescent current when shutdown
cess, the LP2986 delivers superior performance:
n Low ground pin current at all loads
@
%
Dropout Voltage: Typically 180 mV 200 mA load, and 1
n 0.5 output voltage accuracy (“A” grade)
n High peak current capability (400 mA typical)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
@
mV 1 mA load.
@
Ground Pin Current: Typically 1 mA 200 mA load, and
@
200 µA 10 mA load.
Sleep Mode: The LP2986 draws less than 1 µA quiescent
current when shutdown pin is pulled low.
Error Flag: The built-in error flag goes low when the output
drops approximately 5% below nominal.
Applications
n Cellular Phone
Precision Output: The standard product versions available
can be pin-strapped (using the internal resistive divider) to
provide output voltages of 5.0V, 3.3V, or 3.0V with guaran-
teed accuracy of 0.5% (“A” grade) and 1% (standard grade)
at room temperature.
n Palmtop/Laptop Computer
n Camcorder, Personal Stereo, Camera
Block Diagram
DS012935-1
™
VIP is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS012935
www.national.com
Connection Diagram and Ordering Information
Surface Mount Packages:
Mini SO-8 Package Type MM: See NS Package Drawing Number MUA08A
SO-8 Package Type M: See NS Package Drawing Number M08A
DS012935-2
Top View
For ordering information, refer to Table 1 of this document.
Basic Application Circuits
Application Using Internal Resistive Divider
DS012935-3
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2
Basic Application Circuits (Continued)
Application Using External Divider
DS012935-4
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage
Grade
A
Order Information
LP2986AIMMX-5.0
LP2986AIMM-5.0
LP2986IMMX-5.0
LP2986IMM-5.0
LP2986AIMMX-3.3
LP2986AIMM-3.3
LP2986IMMX-3.3
LP2986IMM-3.3
LP2986AIMMX-3.0
LP2986AIMM-3.0
LP2986IMMX-3.0
LP2986IMM-3.0
LP2986AIMX-5.0
LP2986AIM-5.0
LP2986IMX-5.0
LP2986IM-5.0
Package Marking
L41A
Supplied as:
5
3.5k Units on Tape and Reel
250 Units on Tape and Reel
3.5k Units on Tape and Reel
250 Units on Tape and Reel
3.5k Units on Tape and Reel
250 Units on Tape and Reel
3.5k Units on Tape and Reel
250 Units on Tape and Reel
3.5k Units on Tape and Reel
250 Units on Tape and Reel
3.5k Units on Tape and Reel
250 Units on Tape and Reel
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
2.5k Units on Tape and Reel
Shipped in Anti-Static Rails
5
A
L41A
5
STD
STD
A
L41B
5
L41B
3.3
3.3
3.3
3.3
3.0
3.0
3.0
3.0
5
L40A
A
L40A
STD
STD
A
L40B
L40B
L39A
A
L39A
STD
STD
A
L39B
L39B
2986AIM5.0
2986AIM5.0
2986IM5.0
2986IM5.0
2986AIM3.3
2986AIM3.3
2986IM3.3
2986IM3.3
2986AIM3.0
2986AIM3.0
2986IM3.0
2986IM3.0
5
A
5
STD
STD
A
5
3.3
3.3
3.3
3.3
3.0
3.0
3.0
3.0
LP2986AIMX-3.3
LP2986AIM-3.3
LP2986IMX-3.3
LP2986IM-3.3
A
STD
STD
A
LP2986AIMX-3.0
LP2986AIM-3.0
LP2986IMX-3.0
LP2986IM-3.0
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.
Input Supply Voltage
(Operating)
2.1V to +16V
−0.3V to +16V
−0.3V to +5V
Shutdown Pin
Feedback Pin
Output Voltage
Storage Temperature Range
−65˚C to +150˚C
(Survival) (Note 4)
−0.3V to +16V
Operating Junction
Temperature Range
I
OUT (Survival)
Short Circuit Protected
−40˚C to +125˚C
Input-Output Voltage
(Survival) (Note 5)
Lead Temperature
(Soldering, 5 seconds)
−0.3V to +16V
260˚C
2 kV
ESD Rating (Note 2)
Power Dissipation (Note 3)
Internally Limited
Input Supply Voltage
(Survival)
−0.3V to +16V
Electrical Characteristics
Limits in standard typeface are for T = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
J
less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 4.7 µF, CIN = 2.2 µF, VS/D = 2V.
LM2986AI-X.X
LM2986I-X.X
(Note 6)
(Note 6)
Symbol
VO
Parameter
Conditions
Typical
Units
Min
Max
Min
Max
Output Voltage
(5.0V Versions)
5.0
5.0
3.3
3.3
3.0
3.0
4.975
4.960
4.910
3.283
3.274
3.241
2.985
2.976
2.946
5.025
5.040
5.090
3.317
3.326
3.359
3.015
3.024
3.054
0.014
4.950
4.920
4.860
3.267
3.247
3.208
2.970
2.952
2.916
5.050
5.080
5.140
3.333
3.353
3.392
3.030
3.048
3.084
0.014
<
<
0.1 mA IL 200 mA
Output Voltage
(3.3V Versions)
<
<
0.1 mA IL 200 mA
V
Output Voltage
(3.0V Versions)
<
<
0.1 mA IL 200 mA
Output Voltage Line
Regulation
VO(NOM) + 1V ≤ VIN ≤
0.007
%/V
mV
16V
0.032
0.032
VIN–VO
Dropout Voltage
(Note 7)
IL = 100 µA
IL = 75 mA
IL = 200 mA
IL = 100 µA
IL = 75 mA
IL = 200 mA
2.0
3.5
2.0
3.5
1
120
170
230
350
120
150
800
1400
2.1
120
170
230
350
120
150
800
1400
2.1
90
180
100
500
1
IGND
Ground Pin Current
µA
mA
µA
3.7
3.7
<
VS/D 0.3V
0.05
400
1.5
1.5
I
O(PK)
Peak Output Current
Short Circuit Current
VOUT ≥ VO(NOM) − 5%
250
250
mA
IO(MAX)
RL = 0 (Steady State)
(Note 11)
400
160
en
Output Noise Voltage
(RMS)
BW = 300 Hz to 50
kHz, COUT = 10 µF
µV(RMS)
dB
Ripple Rejection
f = 1 kHz, COUT = 10 µF
65
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4
Electrical Characteristics (Continued)
Limits in standard typeface are for T = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
J
less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 4.7 µF, CIN = 2.2 µF, VS/D = 2V.
LM2986AI-X.X
LM2986I-X.X
(Note 6)
(Note 6)
Symbol
Parameter
Conditions
(Note 9)
Typical
Units
Min
Max
Min
Max
Output Voltage
Temperature Coefficient
20
ppm/˚C
FEEDBACK PIN
VFB Feedback Pin Voltage
1.21
1.20
1.19
1.25
1.26
1.28
1.20
1.19
1.18
1.26
1.27
1.29
1.23
1.23
20
V
(Note 10)
(Note 9)
FB Pin Voltage
Temperature Coefficient
ppm/˚C
nA
IFB
Feedback Pin Bias
Current
IL = 200 mA
(Note 9)
330
330
150
0.1
760
760
FB Pin Bias Current
Temperature Coefficient
nA/˚C
SHUTDOWN INPUT
VS/D S/D Input Voltage
VH = O/P ON
VL = O/P OFF
VS/D = 0
1.4
0.55
0
1.6
1.6
V
(Note 8)
0.18
−1
0.18
−1
IS/D
S/D Input Current
µA
VS/D = 5V
5
15
15
ERROR COMPARATOR
IOH
Output “HIGH” Leakage
VOH = 16V
1
1
0.01
150
µA
2
2
VOL
Output “LOW” Voltage
VIN = VO(NOM) − 0.5V,
IO(COMP) = 300 µA
220
350
−3.5
−2.5
−4.9
−3.3
220
350
−3.5
−2.5
−4.9
−3.3
mV
VTHR
(MAX)
Upper Threshold
Voltage
−5.5
−7.7
−5.5
−7.7
−4.6
VTHR
(MIN)
Lower Threshold
Voltage
−8.9
−8.9
%VOUT
−6.6
2.0
−13.0
−13.0
HYST
Hysteresis
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 the Feedback pin is 500V and the Tap pin is 1.5 kV.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T (MAX), the junction-to-ambient thermal resistance, θ
,
J−A
J
and the ambient temperature, T . The maximum allowable power dissipation at any ambient temperature is calculated using:
A
The value of θ
for the SO-8 (M) package is 160˚C/W, and the mini SO-8 (MM) package is 200˚C/W. Exceeding the maximum allowable power dissipation will cause
J−A
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 LM2986 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the V and V
IN
terminals that is normally reverse-biased. Forcing the output above the input will turn
OUT
on this diode and may induce a latch-up mode which can damage the part (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: To prevent mis-operation, the Shutdown input must be driven by a signal that swings above V and below V with a slew rate not less than 40 mV/µs (see
H
L
Application Hints).
Note 9: Temperature coefficient is defined as the maximum (worst-case) change divided by the total temperature range.
Note 10: ≤ V ≤ (V − 1), 2.5V ≤ V ≤ 16V, 100 µA ≤ I ≤ 200 mA, T ≤ 125˚C.
V
FB
OUT IN IN
L
J
Note 11: See Typical Performance Characteristics curves.
5
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Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA.
VOUT vs Temperature
Dropout Voltage vs Temperature
DS012935-8
DS012935-9
DS012935-13
DS012935-11
Dropout Characteristics
Dropout Voltage vs Load Current
DS012935-10
Ground Pin Current vs Load Current
Ground Pin Current vs Temperature and Load
DS012935-12
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6
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA. (Continued)
Input Current vs VIN
Input Current vs VIN
DS012935-15
DS012935-14
Load Transient Response
Load Transient Response
DS012935-17
DS012935-16
Line Transient Response
Line Transient Response
DS012935-20
DS012935-18
7
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Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA. (Continued)
Turn-On Waveform
Turn-Off Waveform
DS012935-23
DS012935-21
Short Circuit Current
Short Circuit Current
DS012935-24
DS012935-25
Short Circuit Current vs Output Voltage
Instantaneous Short Circuit Current vs Temperature
DS012935-27
DS012935-26
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8
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA. (Continued)
DC Load Regulation
Feedback Bias Current vs Load
DS012935-29
DS012935-28
Shutdown Pin Current vs Shutdown Pin Voltage
Feedback Bias Current vs Temperature
DS012935-31
DS012935-30
Input to Output Leakage vs Temperature
Shutdown Voltage vs Temperature
DS012935-37
DS012935-32
9
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Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA. (Continued)
Output Noise Density
Output Impedance vs Frequency
DS012935-35
DS012935-34
Ripple Rejection
Output Impedance vs Frequency
DS012935-36
DS012935-33
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10
when selecting an output capacitor so that the minimum re-
quired amount of output capacitance is provided over the full
operating temperature range. A good Tantalum capacitor will
show very little variation with temperature, but a ceramic
may not be as good (see next section).
Application Hints
EXTERNAL CAPACITORS
Like any low-dropout regulator, external capacitors are re-
quired to assure stability. These capacitors must be correctly
selected for proper performance.
CAPACITOR CHARACTERISTICS
INPUT CAPACITOR: An input capacitor (≥ 2.2 µF) is re-
quired between the LP2986 input and ground (amount of ca-
pacitance may be increased without limit).
TANTALUM: The best choice for size, cost, and perfor-
mance are solid tantalum capacitors. Available from many
sources, their typical ESR is very close to the ideal value re-
quired on the output of many LDO regulators.
This capacitor must be located a distance of not more than
0.5” from the input pin and returned to a clean analog
ground. Any good quality ceramic or tantalum may be used
for this capacitor.
Tantalums also have good temperature stability: a 4.7 µF
was tested and showed only a 10% decline in capacitance
as the temperature was decreased from +125˚C to −40˚C.
The ESR increased only about 2:1 over the same range of
temperature.
OUTPUT CAPACITOR: The output capacitor must meet the
requirement for minimum amount of capacitance and also
have an appropriate E.S.R. (equivalent series resistance)
value.
However, it should be noted that the increasing ESR at lower
temperatures present in all tantalums can cause oscillations
when marginal quality capacitors are used (where the ESR
of the capacitor is near the upper limit of the stability range at
room temperature).
Curves are provided which show the allowable ESR range
as a function of load current for various output voltages and
capacitor values (see ESR curves below).
CERAMIC: For a given amount of a capacitance, ceramics
are usually larger and more costly than tantalums.
ESR Curves For 5V Output
Be warned that the ESR of a ceramic capacitor can be low
enough to cause instability: a 2.2 µF ceramic was measured
and found to have an ESR of about 15 mΩ.
If a ceramic capacitor is to be used on the LP2986 output, a
1Ω resistor should be placed in series with the capacitor to
provide a minimum ESR for the regulator.
Another disadvantage of ceramic capacitors is that their ca-
pacitance varies a lot with temperature:
Large ceramic capacitors are typically manufactured with the
Z5U temperature characteristic, which results in the capaci-
tance dropping by a 50% as the temperature goes from 25˚C
to 80˚C.
This means you have to buy a capacitor with twice the mini-
mum COUT to assure stable operation up to 80˚C.
DS012935-6
ALUMINUM: The large physical size of aluminum electrolyt-
ics makes them unattractive for use with the LP2986. Their
ESR characteristics are also not well suited to the require-
ments of LDO regulators.
ESR Curves For 2.5V Output
The ESR of an aluminum electrolytic is higher than a tanta-
lum, and it also varies greatly with temperature.
A typical aluminum electrolytic can exhibit an ESR increase
of 50X when going from 20˚C to −40˚C. Also, some alumi-
num electrolytics can not be used below −25˚C because the
electrolyte will freeze.
USING AN EXTERNAL RESISTIVE DIVIDER
The LP2986 output voltage can be programmed using an ex-
ternal resistive divider (see Basic Application Circuits).
The resistor connected between the Feedback pin and
ground should be 51.1k. The value for the other resistor (R1)
connected between the Feedback pin and the regulated out-
put is found using the formula:
DS012935-7
VOUT = 1.23 x (1 + R1/51.1k)
IMPORTANT: The output capacitor must maintain its ESR in
the stable region over the full operating temperature range of
the application to assure stability.
It should be noted that the 25 µA of current flowing through
the external divider is approximately equal to the current
saved by not connecting the internal divider, which means
the quiescent current is not increased by using external re-
sistors.
The minimum required amount of output capacitance is
4.7 µF. Output capacitor size can be increased without limit.
It is important to remember that capacitor tolerance and
variation with temperature must be taken into consideration
11
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It is also important that the turn-on (and turn-off) voltage sig-
nals applied to the Shutdown input have a slew rate which is
not less than 40 mV/µs.
Application Hints (Continued)
A lead compensation capacitor (CF) must also be used to
place a zero in the loop response at about 50 kHz. The value
CAUTION: the regulator output state can not be guaranteed
if a slow-moving AC (or DC) signal is applied that is in the
range between VH and VL.
for C can be found using:
F
CF = 1/(2π x R1 x 50k)
A good quality capacitor must be used for CF to ensure that
the value is accurate and does not change significantly over
temperature. Mica or ceramic capacitors can be used, as-
REVERSE INPUT-OUTPUT VOLTAGE
The PNP power transistor used as the pass element in the
LP2986 has an inherent diode connected between the regu-
lator output and input.
±
suming a tolerance of 20% or better is selected.
If a ceramic is used, select one with a temperature coeffi-
cient of NPO, COG, Y5P, or X7R. Capacitor types Z5U, Y5V,
and Z4V can not be used because their value varies more
that 50% over the −25˚C to +85˚C temperature range.
During normal operation (where the input voltage is higher
than the output) this diode is reverse-biased.
However, if the output is pulled above the input, this diode
will turn ON and current will flow into the regulator output.
SHUTDOWN INPUT OPERATION
In such cases, a parasitic SCR can latch which will allow a
high current to flow into VIN (and out the ground pin), which
can damage the part.
The LP2986 is shut off by driving the Shutdown input low,
and turned on by pulling it high. If this feature is not to be
used, the Shutdown input should be tied to VIN to keep the
regulator output on at all times.
In any application where the output may be pulled above the
input, an external Schottky diode must be connected from
To assure proper operation, the signal source used to drive
the Shutdown input must be able to swing above and below
the specified turn-on/turn-off voltage thresholds listed as VH
and VL, respectively (see Electrical Characteristics).
V
IN to VOUT (cathode on VIN, anode on VOUT), to limit the re-
verse voltage across the LP2986 to 0.3V (see Absolute
Maximum Ratings).
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12
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Mini-Small Outline Molded Package, JEDEC
NS Package Number MUA08A
13
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead (0.150” Wide) Molded Small Outline Package, JEDEC
NS Package Number M08A
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT 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.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
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Response Group
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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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