LM4120IM5-5.0 [NSC]
Precision Micropower Low Dropout Voltage Reference; 精密微功耗低压差电压基准型号: | LM4120IM5-5.0 |
厂家: | National Semiconductor |
描述: | Precision Micropower Low Dropout Voltage Reference |
文件: | 总11页 (文件大小:292K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
February 2000
LM4120
Precision Micropower Low Dropout Voltage Reference
General Description
The LM4120 is a precision low power low dropout bandgap
voltage reference with up to 5 mA output current source and
sink capability.
Features
n Small SOT23-5 package
n Low dropout voltage:
n High output voltage accuracy:
n Source and Sink current output:
n Supply current:
@
120 mV Typ 1 mA
%
0.2
±
This series reference operates with input voltages as low as
2V and up to 12V consuming 160 µA (Typ.) supply current. In
power down mode, device current drops to less than 2 µA.
5 mA
160 µA Typ.
50 ppm/˚C
n Low Temperature Coefficient:
n Enable pin
n Fixed output voltages:
and 5.0V
n Industrial temperature Range:
The LM4120 comes in two grades (A and Standard) and
seven voltage options for greater flexibility. The best grade
devices (A) have an initial accuracy of 0.2 , while the stan-
dard have an initial accuracy of 0.5 , both with a tempco of
50ppm/˚C guaranteed from −40˚C to +125˚C.
1.8, 2.048, 2.5, 3.0, 3.3, 4.096
%
%
−40˚C to +85˚C
n (For extended temperature range, −40˚C to 125˚C,
contact National Semiconductor)
The very low dropout voltage, low supply current and
power-down capability of the LM4120 makes this product an
ideal choice for battery powered and portable applications.
Applications
The device performance is guaranteed over the industrial
temperature range (−40˚C to +85˚C), while certain specs are
guaranteed over the extended temperature range (−40˚C to
+125˚C). Please contact National for full specifications over
the extended temperature range. The LM4120 is available in
a standard 5-pin SOT-23 package.
n Portable, battery powered equipment
n Instrumentation and process control
n Automotive & Industrial
n Test equipment
n Data acquisition systems
n Precision regulators
n Battery chargers
n Base stations
n Communications
n Medical equipment
Functional Block Diagram
Connection Diagram
DS101047-2
Refer to the Ordering Information Table in this Data Sheet for Specific
Part Number
SOT23-5 Surface Mount Package
DS101047-1
© 2000 National Semiconductor Corporation
DS101047
www.national.com
Ordering Information
Industrial Temperature Range (−40˚C to + 85˚C)
LM4120 Supplied as
1000 Units, Tape and
Reel
LM4120 Supplied as
3000 Units, Tape and
Reel
Initial Output Voltage Accuracy at 25˚C
And Temperature Coefficient
Top
Marking
LM4120AIM5-1.8
LM4120AIM5-2.0
LM4120AIM5-2.5
LM4120AIM5-3.0
LM4120AIM5-3.3
LM4120AIM5-4.1
LM4120AIM5-5.0
LM4120IM5-1.8
LM4120IM5-2.0
LM4120IM5-2.5
LM4120IM5-3.0
LM4120IM5-3.3
LM4120IM5-4.1
LM4120IM5-5.0
LM4120AIM5X-1.8
LM4120AIM5X-2.0
LM4120AIM5X-2.5
LM4120AIM5X-3.0
LM4120AIM5X-3.3
LM4120AIM5X-4.1
LM4120AIM5X-5.0
LM4120IM5X-1.8
LM4120IM5X-2.0
LM4120IM5X-2.5
LM4120IM5X-3.0
LM4120IM5X-3.3
LM4120IM5X-4.1
LM4120IM5X-5.0
R21A
R14A
R08A
R15A
R16A
R17A
R18A
R21B
R14B
R08B
R15B
R16B
R17B
R18B
%
0.2 , 50 ppm/˚C max (A grade)
%
0.5 , 50 ppm/˚C max
SOT-23 Package Marking Information
Only four fields of marking are possible on the SOT-23’s small surface. This
table gives the meaning of the four fields.
Field Information
First Field:
=
R
Reference
Second and third Field:
=
21 1.800V Voltage Option
=
14 2.048V Voltage Option
=
08 2.500V Voltage Option
=
15 3.000V Voltage Option
=
16 3.300V Voltage Option
=
17 4.096V Voltage Option
=
18 5.000V Voltage Option
Fourth Field:
=
A-B Initial Reference Voltage Tolerance
=
=
±
±
A
B
0.2%
%
0.5
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2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Lead Temperature:
Soldering, (10 sec.)
Vapor Phase (60 sec.)
Infrared (15 sec.)
+260˚C
+215˚C
+220˚C
Maximum Voltage on input or
enable pins
−0.3V to 14V
Indefinite
Operating Range (Note 1)
Output Short-Circuit Duration
Power Dissipation (TA = 25˚C) (Note 2):
MA05B package − θJA
Power Dissipation
Storage Temperature Range
Ambient Temperature Range
Junction Temperature Range
−65˚C to +150˚C
−40˚C to +85˚C
−40˚C to +125˚C
280˚C/W
350 mW
ESD Susceptibility (Note 3)
Human Body Model
Machine Model
2 kV
200V
Electrical Characteristics
=
=
=
=
LM4120-1.8V, 2.048V and 2.5V Unless otherwise specified VIN 3.3V, ILOAD 0, COUT 0.01µF, TA Tj
=
=
25˚C. Limits with standard typeface are for Tj 25˚C, and limits in boldface type apply over the −40˚C ≤ TA ≤ +85˚C tem-
perature range.
Symbol
Parameter
Conditions
Min (Note 5) Typ (Note 4) Max (Note 5)
Units
Output Voltage Initial
Accuracy
±
%
LM4120A-1.800
LM4120A-2.048
LM4120A-2.500
0.2
VOUT
LM4120-1.800
LM4120-2.048
LM4120-2.500
±
%
0.5
TCVOUT/˚C
Temperature Coefficient
Line Regulation
−40˚C ≤ TA ≤ +125˚C
3.3V ≤ VIN ≤ 12V
14
50
ppm/˚c
∆VOUT/∆VIN
0.0007
0.008
0.01
%
/V
0 mA ≤ ILOAD ≤ 1 mA
1 mA ≤ ILOAD ≤ 5 mA
0.03
0.01
0.08
0.17
0.04
0.1
%
/mA
∆VOUT/∆ILOAD Load Regulation
−1 mA ≤ ILOAD ≤ 0 mA
−5 mA ≤ ILOAD ≤ −1 mA
ILOAD = 0 mA
0.04
0.01
45
0.12
65
80
ILOAD = +1 mA
ILOAD = +5 mA
120
180
150
180
VIN−VOUT
Dropout Voltage (Note 6)
mV
210
250
VN
Output Noise Voltage (Note 8) 0.1 Hz to 10 Hz
10 Hz to 10 kHz
20
36
µVPP
µVPP
µA
IS
Supply Current
160
250
275
=
ISS
Power-down Supply Current
Enable 0.4V
1
−40˚C ≤ TJ ≤ +85˚C
2
µA
V
=
Enable 0.2V
VH
VL
IH
Logic High Input Voltage
Logic Low Input Voltage
Logic High Input Current
2.4
0.4
7
2.4
V
µA
0.2
15
3
www.national.com
Electrical Characteristics
=
=
=
=
LM4120-1.8V, 2.048V and 2.5V Unless otherwise specified VIN 3.3V, ILOAD 0, COUT 0.01µF, TA Tj
=
25˚C. Limits with standard typeface are for T =
25˚C, and limits in boldface type apply over the −40˚C ≤ TA ≤ +85˚C
j
temperature range. (Continued)
Symbol Parameter
Conditions
Min (Note 5) Typ (Note 4) Max (Note 5)
Units
IL
Logic Low Input Current
Short Circuit Current
0.1
15
µA
=
=
0
VIN 3.3V, VOUT
6
6
30
30
ISC
mA
=
=
0
VIN 12V, VOUT
17
Hyst
Thermal Hysteresis
(Note 7)
−40˚C ≤ TA ≤ 125˚C
0.5
mV/V
ppm
@
∆VOUT
Long Term Stability
(Note 9)
1000 hrs. 25˚C
100
Electrical Characteristics
=
=
=
LM4120-3.0V, 3.3V, 4.096V and 5.0V Unless otherwise specified VIN VOUT + 1V, ILOAD 0, COUT
=
=
=
0.01µF, TA Tj 25˚C. Limits with standard typeface are for Tj 25˚C, and limits in boldface type apply over the −40˚C ≤
TA ≤ +85˚C temperature range.
Symbol
Parameter
Conditions
Min (Note 5) Typ (Note 4) Max (Note 5) Units
Output Voltage Initial
Accuracy
LM4120A-3.000
LM4120A-3.300
LM4120A-4.096
LM4120A-5.000
±
±
%
0.2
0.5
VOUT
LM4120-3.000
LM4120-3.300
LM4120-4.096
LM4120-5.000
%
TCVOUT/˚C
Temperature Coefficient
Line Regulation
−40˚C ≤ TA ≤ +125˚C
14
50
ppm/˚c
∆VOUT/∆VIN
(VOUT + 1V) ≤ VIN ≤ 12V
0.0007
0.008
0.01
%
/V
0 mA ≤ ILOAD ≤ 1 mA
1 mA ≤ ILOAD ≤ 5 mA
0.03
0.01
0.08
0.17
0.04
0.1
%
/mA
∆VOUT/∆ILOAD Load Regulation
−1 mA ≤ ILOAD ≤ 0 mA
−5 mA ≤ ILOAD ≤ −1 mA
ILOAD = 0 mA
0.04
0.01
45
0.12
65
80
ILOAD = +1 mA
ILOAD = +5 mA
120
180
150
180
VIN−VOUT
Dropout Voltage (Note 6)
mV
210
250
VN
Output Noise Voltage (Note 8) 0.1 Hz to 10 Hz
10 Hz to 10 kHz
20
36
µVPP
µVPP
µA
IS
Supply Current
160
250
275
=
ISS
Power-down Supply Current
Enable 0.4V
1
−40˚C ≤ TJ ≤ +85˚C
2
µA
=
Enable 0.2V
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4
Electrical Characteristics
=
=
=
LM4120-3.0V, 3.3V, 4.096V and 5.0V Unless otherwise specified VIN VOUT + 1V, ILOAD 0, COUT
=
=
=
0.01µF, TA Tj 25˚C. Limits with standard typeface are for Tj 25˚C, and limits in boldface type apply over the −40˚C ≤
TA ≤ +85˚C temperature range. (Continued)
Symbol
Parameter
Conditions
Min (Note 5) Typ (Note 4) Max (Note 5) Units
VH
VL
Logic High Input Voltage
2.4
V
2.4
Logic Low Input Voltage
0.4
V
0.2
15
IH
IL
Logic High Input Current
Logic Low Input Current
7
µA
µA
0.1
15
=
VOUT
0
6
6
30
30
ISC
Short Circuit Current
mA
=
=
0
VIN 12V, VOUT
17
Hyst
Thermal Hysteresis
(Note 7)
−40˚C ≤ TA ≤ 125˚C
0.5
mV/V
ppm
@
∆VOUT
Long Term Stability
(Note 9)
1000 hrs. 25˚C
100
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-
anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by T
(maximum junction
JMAX
=
(T
JMAX
temperature), θ
(junction to ambient thermal resistance) and T (ambient temperature). The maximum power dissipation at any temperature is: PDiss
J-A
A
MAX
− T )/θ
A
up to the value listed in the Absolute Maximum Ratings.
J-A
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged di-
rectly into each pin.
Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.
Note 5: 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 Averaging Outgoing Quality Level (AOQL).
=
Note 6: Dropout voltage is the differential voltage between V
and V at which V
changes ≤ 1% from V
at V
3.3V for 1.8V, 2.0V, 2.5V and V
+
is
OUT
IN
OUT
OUT
IN
OUT
OUT
1V for others.For 1.8V option, dropout voltage is not guaranteed over temperature. A parasitic diode exists between input and output pins; it will conduct if V
pulled to a higher voltage than V
.
IN
Note 7: Thermal hysteresis is defined as the change in +25˚C output voltage before and after exposing the device to temperature extremes.
=
=
*
*
Note 8: Output noise voltage is proportional to V
. V for other voltage option is calculated using (V
/1.8)
V
. V (2.5V) (36µV /1.8) 2.5 46µV
.
PP
OUT
N
N(1.8V)
OUT
N
PP
Note 9: Long term stability is change in V
at 25˚C measured continuously during 1000 hrs.
REF
=
=
LM4120 Typical Operating Characteristics Unless otherwise specified, VIN 3.3V, VOUT 2.5V,
=
=
=
=
ILOAD 0, COUT 0.022µF, TA 25˚C and VEN VIN
.
Long Term Drift
Typical Temperature Drift
Short Circuit Current vs
Temperature
DS101047-12
DS101047-13
DS101047-14
5
www.national.com
=
=
LM4120 Typical Operating Characteristics Unless otherwise specified, VIN 3.3V, VOUT 2.5V,
=
=
=
=
ILOAD 0, COUT 0.022µF, TA 25˚C and VEN VIN. (Continued)
Dropout Voltage vs Output Error
Line Regulation
Dropout Voltage vs Load Current
DS101047-33
DS101047-17
DS101047-15
Load Regulation
GND Pin Current
GND Pin Current at No Load
vs Temperature
DS101047-19
DS101047-18
DS101047-21
GND Pin Current vs Load
0.1Hz to 10Hz output Noise
Output Impedance vs Frequency
DS101047-23
DS101047-22
DS101047-24
www.national.com
6
=
=
LM4120 Typical Operating Characteristics Unless otherwise specified, VIN 3.3V, VOUT 2.5V,
=
=
=
=
ILOAD 0, COUT 0.022µF, TA 25˚C and VEN VIN. (Continued)
PSRR vs Frequency
Enable Response
Start-Up Response
DS101047-27
DS101047-26
DS101047-25
Load Step Response
Load Step Response
Line Step Response
DS101047-28
DS101047-29
DS101047-30
Thermal Hysteresis
Enable Pin Current
DS101047-16
DS101047-31
7
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Pin Functions
Output (Pin 5): Reference Output.
Input (Pin 4):Positive Supply.
Ground (Pin 2):Negative Supply or Ground Connection.
Enable (Pin 3):Pulled to input for normal operation. Forcing
this pin to ground will turn-off the output.
REF (Pin 1):REF Pin. This pin should be left unconnected.
Application Hints
The standard application circuit for the LM4120 is shown in
Figure 1. It is designed to be stable with ceramic output ca-
pacitors in the range of 0.022µF to 0.047µF. Note that
0.022µF is the minimum required output capacitor. These ca-
pacitors typically have an ESR of about 0.1 to 0.5Ω. Smaller
ESR can be tolerated, however larger ESR can not. The out-
put capacitor can be increased to improve load transient re-
sponse, up to about 1µF. However, values above 0.047µF
must be tantalum. With tantalum capacitors, in the 1µF
range, a small capacitor between the output and the refer-
ence pin is required. This capacitor will typically be in the
50pF range. Care must be taken when using output capaci-
tors of 1µF or larger. These application must be thoroughly
tested over temperature, line and load.
An input capacitor is typically not required. However, a 0.1µF
ceramic can be used to help prevent line transients from en-
tering the LM4120. Larger input capacitors should be tanta-
lum or aluminium.
The reference pin is sensitive to noise, and capacitive load-
ing. Therefore, the PCB layout should isolate this pin as
much as possible.
The enable pin is an analog input with very little hysteresis.
About 6µA into this pin is required to turn the part on, and it
must be taken close to GND to turn the part off (see spec.
table for thresholds). There is a minimum slew rate on this
pin of about 0.003V/µS to prevent glitches on the output. All
of these conditions can easily be met with ordinary CMOS or
TTL logic. If the shutdown feature is not required, then this
pin can safely be connected directly to the input supply.
Floating this pin is not recommended.
DS101047-32
FIGURE 1.
Input Capacitor
Noise on the power-supply input can effect the output noise,
but can be reduced by using an optional bypass capacitor
between the input pin and the ground.
Printed Circuit Board Layout Consideration
The mechanical stress due to PC board mounting can cause
the output voltage to shift from its initial value. References in
SOT packages are generally less prone to assembly stress
than devices in Small Outline (SOIC) package.
To reduce the stress-related output voltage shifts, mount the
reference on the low flex areas of the PC board such as near
to the edge or the corner of the PC board.
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8
Typical Application Circuits
Voltage Reference with Complimentary Output
Voltage Reference with Negative Output
DS101047-6
Precision High Current Low Droput Regulator
DS101047-3
Precision High Current Low Dropout Regulator
DS101047-7
Stacking Voltage References
DS101047-4
Precision High Current
Negative Voltage Regulator
DS101047-8
DS101047-5
9
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Typical Application Circuits
Precision Regulator with Current Limiting Circuit
(Continued)
Precision Voltage Reference
with Force and Sense Output
DS101047-9
DS101047-11
Programmable Current Source
Power Supply Splitter
DS101047-20
DS101047-10
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10
Physical Dimensions inches (millimeters) unless otherwise noted
LIFE SUPPORT POLICY
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 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.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
National Semiconductor
Europe
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
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English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
www.national.com
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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