LP2980AIM5X-1.5 [NSC]
Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V; 微SOT 50 mA低电压低压降稳压器用于实现应用与输出电压\u003c 2V
| 型号： | LP2980AIM5X-1.5 |
| 厂家： | 
National Semiconductor |
| 描述： | Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V |
| 文件： | 总14页 (文件大小：802K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2005
LP2980LV
Micropower SOT, 50 mA Low-Voltage Low-Dropout
<
Regulator For Applications With Output Voltages 2V
General Description
Features
n Guaranteed 50 mA output current
n Smallest possible size (SOT-23 Package)
n Requires few external components
The LP2980LV is a 50 mA, fixed-output voltage regulator
designed for high performance in applications requiring out-
put voltages below 2V.
™
<
1 µA quiescent current when shutdown
Using an optimized VIP (Vertically Integrated PNP) pro-
n
cess, the LP2980LV delivers unequalled performance in all
specifications critical to battery-powered designs:
n Low ground pin current at all load currents
n Output voltage accuracy 0.5% (A Grade)
n High peak current capability (150 mA typical)
n Wide supply voltage range (16V max)
n Fast dynamic response to line and load
n Low ZOUT 0.1Ω typical (10 Hz to 1 MHz)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
@
Low Ground Pin Current. Typically 280 µA 50 mA load,
@
and 75 µA 1 mA load.
Sleep Mode. Less than 1 µA quiescent current when ON/
OFF pin is pulled low.
Smallest Possible Size. SOT-23 package uses absolute
minimum board space.
Precision Output. 0.5% tolerance output voltages available
(A grade).
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Block Diagram
10109101
™
VIP is a trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation
DS101091
www.national.com
Connection Diagrams
5-Lead Small Outline Package (M5)
micro SMD, 5 Bump Package (BPA05)
10109102
Top View
See NS Package Number MF05A
For ordering information see Table 1
10109157
Note: The actual physical placement of the package marking will vary from
part to part. The package marking will designate the date code and will vary
considerably. Package marking does not correlate to device type in any way.
Top View
See NS Package Number BPA05
Pin Descrption
Name
Pin Number
micro SMD
Function
SOT-23
VIN
GND
1
2
3
4
5
C3
A1
A3
B2
C1
Input Voltage
Common Ground (device substrate)
Logic high enable input
ON/OFF
N/C
Post package trim - do not connect to this pin
Regulated output voltage
VOUT
Ordering Information
TABLE 1. Package Marking and Ordering Information
Output Voltage
(V)
Grade
A
Order Information
LP2980AIM5X-1.5
LP2980AIM5-1.5
LP2980IM5X-1.5
LP2980IM5-1.5
Package Marking
LANA
Supplied as:
1.5V
1.5V
1.5V
1.5V
1.8V
1.8V
1.8V
1.8V
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
A
LANA
STD
STD
A
LANB
LANB
LP2980AIM5X-1.8
LP2980AIM5-1.8
LP2980IM5X-1.8
LP2980IM5-1.8
LAGA
A
LAGA
STD
STD
LAGB
LAGB
>
For output voltages 2V, refer to LP2980 datasheet. If a non-standard voltage is required, see LP2980-ADJ.
www.national.com
2
Basic Application Circuit
10109103
3
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Absolute Maximum Ratings (Note 1)
Power Dissipation (Note 3)
Input Supply Voltage (Survival)
Input Supply Voltage (Operating)
ON/OFF Input Voltage (Survival)
Output Voltage (Survival), (Note
4)
Internally Limited
−0.3V to +16V
2.1V to +16V
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
−0.3V to +16V
Storage Temperature Range
Operating Junction Temperature
Range
−65˚C to +150˚C
−0.3V to +9V
−40˚C to +125˚C
IOUT (Survival)
Short Circuit Protected
Lead Temperature
Input-Output Voltage (Survival),
(Note 5)
(Soldering, 5 sec.)
260˚C
2 kV
−0.3V to +16V
ESD Rating (Note 2)
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2V.
Symbol
Parameter
Conditions
Typ
LP2980LVAI-XX
LP2980LVI-XX
Units
(Note 6)
(Note 6)
Min
Max
0.50
0.75
2.50
Min
Max
1.00
IL = 1 mA
−0.50
−0.75
−2.50
−1.00
−1.50
−3.50
Output Voltage
∆VO
<
<
%VNOM
%/V
1 mA IL 50 mA
1.50
Tolerance
−3.50
Output Voltage Line
Regulation
VO(NOM) + 1V ≤ VIN ≤
16V
0.014
0.014
0.007
0.032
0.032
IL = 0
85
110
95
85
110
95
65
75
IL = 1 mA
IL = 10 mA
IL = 50 mA
160
175
325
475
850
1
160
175
325
475
850
1
IGND
Ground Pin Current
µA
120
280
0
<
VON/OFF 0.18V
V
IN(min)
Minimum input voltage
required to maintain
output regulation
ON/OFF Input Voltage
(Note 7)
IL = 50 mA
2.05
2.20
2.20
V
V
VON/OFF
ION/OFF
High = O/P ON
Low = O/P OFF
VON/OFF = 0
1.4
0.55
0
1.6
1.6
0.18
−1
0.18
−1
ON/OFF Input Current
µA
mA
µV
VON/OFF = 5V
5
15
15
IO(PK)
en
Peak Output Current
Output Noise Voltage
(RMS)
VOUT ≥ VO(NOM) − 5%
BW = 300 Hz to 50 kHz,
COUT = 10 µF
150
100
100
125
Ripple Rejection
f = 1kHz COUT = 10 µF
63
dB
IO(MAX)
Short Circuit Current
RL = 0 (Steady State)
(Note 8)
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 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
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4
Electrical Characteristics (Continued)
The value of θ for the SOT-23 package is 220˚C/W. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator
JA
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 LP2980LV 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 and possibly damage the device (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: The ON/OFF input must be properly driven to prevent misoperation. For details, refer to Application Hints.
Note 8: See Typical Performance Characteristics curves.
5
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Typical Performance Characteristics
Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1µF, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V,
VOUT(NOM) = 1.8V.
VOUT vs
Temperature
Output Characteristics
10109105
10109107
Min Input Voltage vs Temperature
Ground Pin Current vs Temperature
10109122
10109108
Ground Pin Current vs
Load Current
Input Current vs VIN
10109123
10109109
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6
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1µF, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Input Current vs VIN
Input Current vs VIN
10109110
10109111
Line Transient
Line Transient
10109124
10109125
Load Transient Response
Load Transient Response
10109114
10109115
7
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Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1µF, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Instantaneous Short Circuit Current vs
Short Circuit Current
Temperature
10109126
10109127
Instantaneous Short Circuit Current vs
Output Voltage
Short Circuit Current
10109128
10109129
Output Impedance vs Frequency
Output Noise Density
10109106
10109113
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8
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1µF, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Input to Output Leakage vs
Ripple Rejection
Temperature
10109130
10109112
Output Reverse Leakage vs
Temperature
Turn-On Waveform
10109116
10109131
Turn-Off Waveform
ON/OFF Pin current vs VON/OFF
10109117
10109132
The input capacitor must be located a distance of not more
than 1 cm away from the input pin and returned to a clean
analog ground. Any good quality ceramic, Tantalum, or film
capacitor may be used at the input.
Application Hints
INPUT CAPACITOR
An input capacitor whose capacitance is ≥ 1 µF is required
between the LP2980 input pin and ground (the amount of
capacitance may be increased without limit).
IMPORTANT: Tantalum capacitors may suffer catastrophic
failure due to surge current when connected to a low-
impedance source of power (like a battery or very large
9
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Application Hints (Continued)
capacitor). If a Tantalum input capacitor is used, it must be
guaranteed by the manufacturer to have a surge current
rating sufficient for the application.
There are no requirements for ESR on the input capacitor,
but tolerance and temperature coefficient must be consid-
ered when selecting the capacitor to ensure the capacitance
will be ≥ 1 µF over the entire operating range.
OUTPUT CAPACITOR
The LP2980 requires an output capacitor to maintain loop
stability. The capacitor must be selected to meet the require-
ments of capacitance and ESR (equivalent series resis-
tance) over the full operating temperature range of the ap-
plication (see SELECTING THE OUTPUT CAPACITOR).
10109120
10 µF ESR Curves For 1.8V Output
The minimum amount of capacitance which can be used on
the output is 2.2 µF, but this value may be increased without
limit.
Four curves are provided which show the stable ESR range
of the LP2980-1.8V operated with output capacitances of
2.2, 4.7, 10, and 15 µF:
10109121
15 µF ESR Curves For 1.8V Output
It should be noted that for the lower values of the output
<
capacitance ( 10 µF), it may be necessary to use a capaci-
10109118
tor and series resistance to provide sufficient ESR. To un-
derstand why this is true, the basic characteristics of capaci-
tance types must be explained:
2.2 µF ESR Curves For 1.8V Output
CAPACITOR CHARACTERISTICS:
Ceramic Capacitors have an extremely low ESR (in the
range of 5-15 mΩ), and can only be used on the output of the
LP2980 if an external resistor is placed in series to supply
the needed ESR (a resistance value of about 2Ω +/− 30% is
recommended).
Be careful of the temperature coefficient of ceramics: select
X7R or X5R if possible, because those types typically vary
less than +/− 25% over the range of −40 to +125˚C. Z5U
types are worse, and will typically lose half (or more) of their
capacitance over the same temperature range.
A source for large-value ceramics with good performance is
Taiyo-Yuden. Their web address is :
10109119
http://www.t-yuden.com/hicap.html
4.7 µF ESR Curves For 1.8V Output
Tantalum capacitors have ESR values that are more diffi-
cult to determine: the manufacturers specify only a maxi-
mum limit, which is typically 10X or 20X the typical value.
ESR values can vary considerably from lot to lot and from
manufacturer to manufacturer. For example, some 4.7 µF/
10V devices tested showed typical values in the range of 0.5
- 1Ω, but values as high as 6Ω have been seen.
It should also be noted that the ESR typically increases
about 2X - 3X when going from +125˚C down to −40˚C.
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10
At values of load current ≤ 20 mA, the ESR range is wide
enough that Tantalum can be used without external resis-
tance for added ESR.
Application Hints (Continued)
Another factor to consider is that Tantalum manufacturers
are presently designing their products toward the goal of
getting the lowest possible ESR, in an attempt to compete
with the new high-value ceramic capacitors. This means that
the typical values will probably continue to decline in the
future.
Another acceptable configuration for 50 mA operation is to
use a ceramic or film 10 µF capacitor (which has very low
ESR) with an external 2Ω resistor in series.
15 µF OUTPUT CAPACITOR
The stable ESR range (for 50 mA load current) using a 15 µF
output capacitor is approximately 0.1Ω to 10Ω. It is ex-
tremely unlikely that a 15 µF Tantalum capacitor would be
found with an ESR below 0.1Ω, so no external resistance is
required with a Tantalum.
SELECTING THE OUTPUT CAPACITOR
This section contains guidelines for selecting an output ca-
pacitor which will maintain good regulator stability over the
entire operating temperature range (refer to ESR CURVES).
As before, another acceptable configuration for 50 mA op-
eration is to use a ceramic or film 15 µF capacitor with an
external 2Ω resistor in series.
2.2 µF OUTPUT CAPACITOR
The smallest output capacitor which can be used with the
LP2980-1.8 is 2.2 µF. However, care must be exercised if
this value is used because of the ESR requirement.
ON/OFF INPUT OPERATION
At load currents ≤ 25mA, the stable ESR range is approxi-
mately 0.5Ω to 6Ω. This range is probably sufficiently wide
that most 2.2 µF Tantalum capacitors would fall within it.
The LP2980 is shut off by pulling the ON/OFF input low, and
turned on by pulling it high. If this feature is not to be used,
this pin should be tied to VIN to keep the regulator on at all
times.
At higher values of load currents (using a 2.2 µF output
capacitor), the stable ESR window gets very narrow. It is
likely that a Tantalum capacitor would not be a good choice
for a design that must be robust enough for mass production.
Instead, a 2.2 µF capacitor with very low ESR (either ce-
ramic or film) should be used with a 2Ω external resistor
placed in series to provide the ESR.
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 (see Electri-
cal Characteristics).
It is also important that the turn-on (and turn-off) voltage
signals applied to the ON/OFF input have a slew rate which
is not less than 40 mV/µs.
4.7 µF OUTPUT CAPACITOR
CAUTION: The regulator output state can not be guaranteed
if a slow-moving AC (or DC) signal is applied that it is in the
range between the turn-on/turn-off voltage thresholds speci-
fied in the Electrical Characteristics section.
If a 4.7 µF capacitor is used, the stable range of ESR values
for 50 mA operation is approximately 0.6Ω to 6Ω. Because of
the reduced ESR values of the new Tantalum, it is possible
to find 4.7 µF Tantalum capacitors with ESR values at or
below 0.6Ω. To ensure a stable design, it is recommended
that an external resistor (value about 0.5Ω) be added in
series with the 4.7 µF Tantalum to provide adequate mini-
mum ESR.
REVERSE INPUT/OUTPUT VOLTAGE
The PNP power transistor used as the pass element in the
LP2980 has an inherent diode connected between the regu-
lator output and input. During normal operation (where the
input voltage is higher than the output) this diode is reverse-
biased.
At values of load current ≤ 20 mA, the ESR range is wide
enough that Tantalum can be used without external resis-
tance for added ESR.
However, if the output is pulled above the input, 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 VIN (and out the ground pin), which can
damage the part.
Another acceptable configuration for 50 mA operation is to
use a ceramic or film 4.7 µF capacitor (which has very low
ESR) with an external 2Ω resistor in series.
10 µF OUTPUT CAPACITOR
In any application where the output may be pulled above the
input, an external Schottky diode must be connected from
VIN to VOUT (cathode on VIN, anode on VOUT), to limit the
reverse voltage across the LP2980 to 0.3V (see Basic Ap-
plication Circuit).
50 mA operation using a 10 µF output capacitor requires an
ESR in the range of approximately 0.4Ω to 7Ω. As stated
previously, it is possible that solid Tantalum capacitors can
be found with ESR values near to or below 0.4Ω. An external
resistor in series with the Tantalum (value of about 0.5Ω) is
recommended to assure unconditional stability.
11
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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 “Order Information” section of this document.
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12
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 PACKAGE 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 1in the “Ordering 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
13
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Notes
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.
For the most current product information visit us at www.national.com.
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