LP2954AISX/NOPB [NSC]
IC VREG 5 V FIXED POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PSSO3, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator;
| 型号： | LP2954AISX/NOPB |
| 厂家： | 
National Semiconductor |
| 描述： | IC VREG 5 V FIXED POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PSSO3, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator 输出元件 调节器 |
| 文件： | 总15页 (文件大小：791K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
April 2005
LP2954/LP2954A
5V and Adjustable Micropower Low-Dropout Voltage
Regulators
General Description
Features
n 5V output within 1.2% over temperature (A grade)
n Adjustable 1.23 to 29V output voltage available
(LP2954IM and LP2954AIM)
The LP2954 is a 5V micropower voltage regulator with very
low quiescent current (90 µA typical at 1 mA load) and very
low dropout voltage (typically 60 mV at light loads and
470 mV at 250 mA load current).
n Guaranteed 250 mA output current
n Extremely low quiescent current
n Low dropout voltage
The quiescent current increases only slightly at dropout
(120 µA typical), which prolongs battery life.
The LP2954 with a fixed 5V output is available in the three-
lead TO-220 and TO-263 packages. The adjustable LP2954
is provided in an 8-lead surface mount, small outline pack-
age. The adjustable version also provides a resistor network
which can be pin strapped to set the output to 5V.
n Reverse battery protection
n Extremely tight line and load regulation
n Very low temperature coefficient
n Current and thermal limiting
n Pin compatible with LM2940 and LM340 (5V version
only)
Reverse battery protection is provided.
The tight line and load regulation (0.04% typical), as well as
very low output temperature coefficient make the LP2954
well suited for use as a low-power voltage reference.
n Adjustable version adds error flag to warn of output drop
and a logic-controlled shutdown
Output accuracy is guaranteed at both room temperature
and over the entire operating temperature range.
Applications
n High-efficiency linear regulator
n Low dropout battery-powered regulator
Package Outline and Ordering
Information
TO-263 3-Lead Plastic Surface-Mount Package
TO-220 3–Lead Plastic Package
01112809
Top View
01112802
Front View
Order Number LP2954AIT or LP2954IT
See NS Package T03B
01112810
Side View
Order Number LP2954AIS or LP2954IS
See NS Package TS3B
SO-8 Small Outline Surface Mount
01112833
Top View
Order Number LP2954AIM or LP2954IM
See NS Package M08A
© 2005 National Semiconductor Corporation
DS011128
www.national.com
Ordering Information
Order Number
Temp. Range
(TJ) ˚C
Package
(JEDEC)
TO-220
NS Package
Number
TO3B
LP2954AIT
LP2954IT
LP2954AIS
LP2954IS
−40 to +125
−40 to +125
TO-263
TS3B
LP2954AIM
LP2954IM
−40 to +125
SO-8
M08A
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2
Absolute Maximum Ratings (Note 1)
Storage Temperature Range
Lead Temperature
−65˚C to +150˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Soldering, 5 seconds)
Power Dissipation (Note 2)
Input Supply Voltage
ESD Rating
260˚C
Internally Limited
−20V to +30V
2 kV
Operating Junction Temperature
Range
LP2954AI/LP2954I
−40˚C to +125˚C
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, bold typeface applies over the −40˚C to +125˚C temperature range. Limits
are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Un-
less otherwise noted: VIN = 6V, IL = 1 mA, CL = 2.2 µF.
Symbol
Parameter
Conditions
Typical
2954AI
2954I
Units
Min
Max
5.025
5.060
5.070
100
Min
Max
5.050
5.100
5.120
150
VO
Output Voltage
5.0
4.975
4.940
4.930
4.950
4.900
4.880
V
1 mA ≤ IL ≤ 250 mA
5.0
Output Voltage
Temp. Coefficient
Line Regulation
(Note 3)
20
ppm/˚C
%
VIN = 6V to 30V
0.03
0.04
0.10
0.20
0.20
0.40
Load Regulation
IL = 1 to 250 mA
IL = 0.1 to 1 mA
0.16
0.20
%
0.20
0.30
(Note 4)
V
IN–VO
Dropout Voltage
(Note 5)
IL = 1 mA
60
240
310
470
90
100
150
300
420
400
520
600
800
150
180
2
100
150
300
420
400
520
600
800
150
180
2
mV
IL = 50 mA
IL = 100 mA
IL = 250 mA
IL = 1 mA
IGND
Ground Pin Current
(Note 6)
µA
IL = 50 mA
IL = 100 mA
IL = 250 mA
VIN = 4.5V
1.1
4.5
21
mA
2.5
6
2.5
6
8
8
28
28
33
33
IGND
Ground Pin
170
210
170
210
Current at Dropout
(Note 6)
120
380
0.05
µA
mA
ILIMIT
Current Limit
VOUT = 0V
(Note 7)
500
530
0.2
500
530
0.2
Thermal Regulation
%/W
3
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Electrical Characteristics (Continued)
Limits in standard typeface are for TJ = 25˚C, bold typeface applies over the −40˚C to +125˚C temperature range. Limits
are guaranteed by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Un-
less otherwise noted: VIN = 6V, IL = 1 mA, CL = 2.2 µF.
Symbol
Parameter
Conditions
Typical
2954AI
2954I
Units
Min
Max
Min
Max
en
Output Noise
CL = 2.2 µF
400
µV RMS
Voltage
(10 Hz to 100 kHz)
CL = 33 µF
260
IL = 100 mA
CL=33µF(Note 9)
80
Additional Specifications for the Adjustable Device (LP2954AIM and LP2954IM)
VREF
Reference Voltage
(Note 10)
1.230
1.215
1.245
1.255
0.1
1.205
1.255
1.270
0.2
V
%
%
1.205
1.190
∆VREF
VREF
/
Reference Voltage
Line Regulation
VIN=2.5V to
VO(NOM)+1V
VIN=2.5V to
VO(NOM)+1V to 30V
(Note 11)
0.03
0.2
0.4
∆VREF/∆T Reference Voltage
Temperature
(Note 3)
20
ppm/˚C
Coefficient
IB(FB)
IGND
Feedback Pin Bias
Current
20
40
60
40
60
nA
µA
Ground Pin Current at VSHUTDOWN≤1.1V
105
140
140
Shutdown (Note 6)
IO(SINK) Output "OFF"
Pulldown Current
(Note 12)
30
30
mA
20
20
Dropout Detection Comparator
IOH
Output "HIGH"
VOH=30V
0.01
150
−60
−85
15
1
1
µA
mV
mV
mV
mV
mV
Leakage Current
2
2
VOL
Output "LOW" Voltage VIN=VO(NOM)−0.5V
IO(COMP)=400µA
250
400
−35
−25
−55
−40
250
400
−35
−25
−55
−40
V
THR(MAX) Upper Threshold
(Note 13)
−80
−95
−80
−95
Voltage
VTHR(MIN) Lower Threshold
Voltage
(Note 13)
−110
−160
−110
−160
HYST
Hysteresis
(Note 13)
Shutdown Input
VOS
Input Offset Voltage
(Referred to VREF
)
3
−7.5
7.5
−7.5
7.5
−10
10
−10
10
HYST
IB
Hysteresis
6
mV
nA
Input Bias Current
VIN(S/D)=0V to 5V
10
−30
30
−30
30
−50
50
−50
50
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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
device outside of its rated operating conditions.
Note 2: 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
.
Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The junction-to-
ambient thermal resistance of the TO-220 (without heatsink) is 60˚C/W, 73˚C/W for the TO-263, and 160˚C/W for the SO-8. If the TO-263 package is used, the
thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package: Using 0.5 square inches of copper area, θ is
JA
50˚C/W; with 1 square inch of copper area, θ is 37˚C/W; and with 1.6 or more square inches of copper area, θ is 32˚C/W. The junction-to-case thermal resistance
JA
JA
is 3˚C/W. If an external heatsink is used, the effective junction-to-ambient thermal resistance is the sum of the junction-to-case resistance (3˚C/W), the specified
thermal resistance of the heatsink selected, and the thermal resistance of the interface between the heatsink and the LP2954. Some typical values are listed for
interface materials used with TO-220:
TABLE 1. Typical Values of Case-to-Heatsink
TABLE 2. Typical Values of Case-to-Heatsink
Thermal Resistance (˚C/W) (Data from AAVID Eng.)
Thermal Resistance (˚C/W) (Data from Thermalloy)
Silicone grease
Dry interface
1.0
1.3
1.4
Thermasil III
Thermasil II
1.3
1.5
Mica with grease
Thermalfilm (0.002) with grease 2.2
Note 3: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 4: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested separately for load regulation in the load
ranges 0.1 mA–1 mA and 1 mA–250 mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 5: 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 6: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current.
Note 7: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for 200 mA load pulse at V = 20V (3W pulse) for T = 10 ms.
IN
Note 8: When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground.
Note 9: Connect a 0.1µF capacitor from the output to the feedback pin.
Note 10: V
≤V
≤(V −1V), 2.3V≤V ≤30V, 100µA≤I ≤250mA.
REF OUT IN IN L
Note 11: Two seperate tests are performed, one covering V =2.5V to V (NOM)+1V and the other test for V =2.5V to V (NOM)+1V to 30V.
IN
O
IN
O
Note 12: V
≤1.1V, VOUT=V (NOM).
O
SHUTDOWN
Note 13: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at
V
=V (NOM)+1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V /V =(R1+R2)/R2.
IN
O
OUT REF
Note 14: Human body model, 200pF discharged through 1.5kΩ.
Typical Performance Characteristics
Quiescent Current
Quiescent Current
01112812
01112813
5
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Typical Performance Characteristics (Continued)
Ground Pin Current vs Load
Ground Pin Current
01112815
01112814
Ground Pin Current
Output Noise Voltage
01112816
01112817
Ripple Rejection
Ripple Rejection
01112819
01112818
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6
Typical Performance Characteristics (Continued)
Ripple Rejection
Line Transient Response
01112821
01112820
Line Transient Response
Output Impedance
01112822
01112823
Load Transient Response
Load Transient Response
01112824
01112825
7
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Typical Performance Characteristics (Continued)
Dropout Characteristics
Thermal Response
01112827
01112826
Short-Circuit Output
Current and Maximum
Output Current
Maximum Power Dissipation
(TO-263) (See (Note 2) )
01112828
01112811
for stability. At 3.3V output, a minimum of 4.7 µF is required.
For the worst case condition of 1.23V output and 250 mA of
load current, a 6.8 µF (or larger) capacitor should be used.
Application Hints
EXTERNAL CAPACITORS
Stray capacitance to the Feedback terminal can cause insta-
bility. This problem is most likely to appear when using high
value external resistors to set the output voltage. Adding a
100 pF capacitor between the Output and Feedback pins
and increasing the output capacitance to 6.8 µF (or greater)
will cure the problem.
A 2.2 µF (or greater) capacitor is required between the
output pin and the ground to assure stability (refer to Figure
1). Without this capacitor, the part may oscillate. Most types
of tantalum or aluminum electrolytics will work here. Film
types will work, but are more expensive. Many aluminum
electrolytics contain electrolytes which freeze at −30˚C,
which requires the use of solid tantalums below −25˚C. The
important parameters of the capacitor are an ESR of about
5Ω or less and a resonant frequency above 500 kHz (the
ESR may increase by a factor of 20 or 30 as the temperature
is reduced from 25˚C to −30˚C). The value of this capacitor
may be increased without limit. At lower values of output
current, less output capacitance is required for stability. The
capacitor can be reduced to 0.68 µF for currents below
10 mA or 0.22 µF for currents below 1 mA.
MINIMUM LOAD
When setting the output voltage using an external resistive
divider, a minimum current of 1 µA is recommended through
the resistors to provide a minimum load.
It should be noted that a minimum load current is specified in
several of the electrical characteristic test conditions, so this
value must be used to obtain correlation on these tested
limits. The part is parametrically tested down to 100 µA, but
is functional with no load.
A 1 µF capacitor should be placed from the input pin to
ground if there is more than 10 inches of wire between the
input and the AC filter capacitor or if a battery input is used.
Programming the output for voltages below 5V runs the error
amplifier at lower gains requiring more output capacitance
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8
lated value is below 60˚ C/W, an external heatsink is re-
quired. The required thermal resistance for this heatsink can
be calculated using the formula:
Application Hints (Continued)
DROPOUT VOLTAGE
The dropout voltage of the regulator is defined as the mini-
mum input-to-output voltage differential required for the out-
put voltage to stay within 100 mV of the output voltage
measured with a 1V differential. The dropout voltages for
various values of load current are listed under Electrical
Characteristics.
θ(H-A) = θ(J-A) − θ(J-C) − θ(C-H)
where:
θ(J-C) is the junction-to-case thermal resistance, which is
specified as 3˚ C/W maximum for the LP2954.
θ(C-H) is the case-to-heatsink thermal resistance, which is
dependent on the interfacing material (if used). For details
and typical values, refer to (Note 2) listed at the end of the
ELECTRICAL CHARACTERISTICS section.
If the regulator is powered from a rectified AC source with a
capacitive filter, the minimum AC line voltage and maximum
load current must be used to calculate the minimum voltage
at the input of the regulator. The minimum input voltage,
including AC ripple on the filter capacitor , must not drop
below the voltage required to keep the LP2954 in regulation.
It is also advisable to verify operating at minimum operating
ambient temperature, since the increasing ESR of the filter
capacitor makes this a worst-case test for dropout voltage
due to increased ripple amplitude.
θ
(H-A) is the heatsink-to-ambient thermal resistance. It is this
specification (listed on the heatsink manufacturers data
sheet) which defines the effectiveness of the heatsink. The
heatsink selected must have a thermal resistance which is
equal to or lower than the value of θ(H-A) calculated from the
above listed formula.
PROGRAMMING THE OUTPUT VOLTAGE
The regulator may be pin-strapped for 5V operation using its
internal resistive divider by tying the Output and Sense pins
together and also tying the Feedback and 5V Tap pins
together.
HEATSINK REQUIREMENTS
A heatsink may be required with the LP2954 depending on
the maximum power dissipation and maximum ambient tem-
perature of the application. Under all possible operating
conditions, the junction temperature must be within the
range specified under Absolute Maximum Ratings.
Alternatively, it may be programmed for any voltage between
the 1.23V reference and the 30V maximum rating using an
external pair of resistors (see Figure 2). The complete equa-
tion for the output voltage is:
To determine if a heatsink is required, the maximum power
dissipated by the regulator, P(max), must be calculated. It is
important to remember that if the regulator is powered from
a transformer connected to the AC line, the maximum
specified AC input voltage must be used (since this pro-
duces the maximum DC input voltage to the regulator).
Figure 1 shows the voltages and currents which are present
in the circuit. The formula for calculating the power dissi-
pated in the regulator is also shown in Figure 1.
where VREF is the 1.23V reference and IFB is the Feedback
pin bias current (−20 nA typical). The minimum recom-
mended load current of 1 µA sets an upper limit of 1.2 MΩ on
the value of R2 in cases where the regulator must work with
no load (see MINIMUM LOAD ). IFB will produce a typical 2%
error in VOUT which can be eliminated at room temperature
by trimming R1. For better accuracy, choosing R2 = 100 kΩ
will reduce this error to 0.17% while increasing the resistor
program current to 12 µA. Since the typical quiescent current
is 120 µA, this added current is negligible.
01112805
*See External Capacitors
P
Total
= (V −5) I + (V ) I
IN L IN G
FIGURE 1. Basic 5V Regulator Circuit
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, TR(max). This is calculated
by using the formula:
TR(max) = TJ(max) − TA(max)
where: TJ(max) is the maximum allowable junction
temperature
TA(max) is the maximum ambient temperature
01112836
Using the calculated values for TR(max) and P(max), the
required value for junction-to-ambient thermal resistance,
* See Application Hints
** Drive with TTL-low to shut down
θ(J-A), can now be found:
θ(J-A) = TR(max)/P(max)
If the calculated value is 60˚ C/W or higher , the regulator
FIGURE 2. Adjustable Regulator
may be operated without an external heatsink. If the calcu-
9
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Application Hints (Continued)
OUTPUT ISOLATION
DROPOUT DETECTION COMPARATOR
The regulator output can be left connected to an active
voltage source (such as a battery) with the regulator input
power turned off, as long as the regulator ground pin is
connected to ground . If the ground pin is left floating,
damage to the regulator can occur if the output is pulled
up by an external voltage source.
This comparator produces a logic “LOW” whenever the out-
put falls out of regulation by more than about 5%. This figure
results from the comparator’s built-in offset of 60 mV divided
by the 1.23V reference (refer to block diagrams on page 1).
The 5% low trip level remains constant regardless of the
programmed output voltage. An out-of-regulation condition
can result from low input voltage, current limiting, or thermal
limiting.
REDUCING OUTPUT NOISE
In reference applications it may be advantageous to reduce
the AC noise present on the output. One method is to reduce
regulator bandwidth by increasing output capacitance. This
is relatively inefficient, since large increases in capacitance
are required to get significant improvement.
Figure 3 gives a timing diagram showing the relationship
between the output voltage, the ERROR output, and input
voltage as the input voltage is ramped up and down to a
regulator programmed for 5V output. The ERROR signal
becomes low at about 1.3V input. It goes high at about 5V
input, where the output equals 4.75V. Since the dropout
voltage is load dependent, the input voltage trip points will
vary with load current. The output voltage trip point does not
vary.
Noise can be reduced more effectively by a bypass capacitor
placed across R1 (refer to Figure 2). The formula for select-
ing the capacitor to be used is:
The comparator has an open-collector output which requires
an external pull-up resistor. This resistor may be connected
to the regulator output or some other supply voltage. Using
the regulator output prevents an invalid “HIGH” on the com-
parator output which occurs if it is pulled up to an external
voltage while the regulator input voltage is reduced below
1.3V. In selecting a value for the pull-up resistor, note that
while the output can sink 400 µA, this current adds to battery
drain. Suggested values range from 100 kΩ to 1 MΩ. This
resistor is not required if the output is unused.
This gives a value of about 0.1 µF. When this is used, the
output capacitor must be 6.8 µF (or greater) to maintain
stability. The 0.1 µF capacitor reduces the high frequency
gain of the circuit to unity, lowering the output noise from 260
µV to 80 µV using a 10 Hz to 100 kHz bandwidth. Also, noise
is no longer proportional to the output voltage, so improve-
ments are more pronounced at high output voltages.
When VIN ≤ 1.3V, the error flag pin becomes a high imped-
ance, allowing the error flag voltage to rise to its pull-up
voltage. Using VOUT as the pull-up voltage (rather than an
external 5V source) will keep the error flag voltage below
1.2V (typical) in this condition. The user may wish to divide
down the error flag voltage using equal-value resistors
(10 kΩ suggested) to ensure a low-level logic signal during
any fault condition, while still allowing a valid high logic level
during normal operation.
SHUTDOWN INPUT
A logic-level signal will shut off the regulator output when a
<
“LOW” ( 1.2V) is applied to the Shutdown input.
To prevent possible mis-operation, the Shutdown input must
be actively terminated. If the input is driven from open-
collector logic, a pull-up resistor (20 kΩ to 100 kΩ recom-
mended) should be connected from the Shutdown input to
the regulator input.
If the Shutdown input is driven from a source that actively
pulls high and low (like an op-amp), the pull-up resistor is not
required, but may be used.
If the shutdown function is not to be used, the cost of the
pull-up resistor can be saved by simply tying the Shutdown
input directly to the regulator input.
IMPORTANT: Since the Absolute Maximum Ratings state
that the Shutdown input can not go more than 0.3V below
ground, the reverse-battery protection feature which protects
the regulator input is sacrificed if the Shutdown input is tied
directly to the regulator input.
If reverse-battery protection is required in an application, the
pull-up resistor between the Shutdown input and the regula-
tor input must be used.
01112837
* In shutdown mode, ERROR will go high if it has been pulled up to an
external supply. To avoid this invalid response, pull up to regulator output.
** Exact value depends on dropout voltage. (See Application Hints)
FIGURE 3. ERROR Output Timing
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10
Typical Applications
Typical Application Circuit
01112801
5V Regulator
01112806
5V Current Limiter
01112807
*Output voltage equals +V minus dropout voltage, which varies with output current. Current limits at 380 mA (typical).
IN
11
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Schematic Diagram
01112808
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12
Physical Dimensions inches (millimeters)
unless otherwise noted
TO-220 3-Lead Plastic Package
Order Number LP2954AIT or LP2954IT
NS Package T03B
13
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-263 3-Lead Plastic Surface Mount Package
Order Number LP2954AIS or LP2954IS
NS Package TS3B
SO-8 Surface Mount Package
Order Number LP2954AIM or LP2954IM
NS Package Number M08A
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14
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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IC VREG 5 V FIXED POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PDSO8, SO-8, Fixed Positive Single Output LDO Regulator
NSC
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