NSC LM4120IM5X-2.5 Precision micropower low dropout voltage reference Datasheet

LM4120
Precision Micropower Low Dropout Voltage Reference
General Description
Features
The LM4120 is a precision low power low dropout bandgap
voltage reference with up to 5 mA output current source and
sink capability.
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.
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 standard have an initial accuracy of 0.5%, both with a tempco of
50ppm/˚C guaranteed from −40˚C to +125˚C.
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.
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
n
n
n
n
n
n
n
Small SOT23-5 package
Low dropout voltage:
120 mV Typ @ 1 mA
High output voltage accuracy:
0.2%
± 5 mA
Source and Sink current output:
Supply current:
160 µA Typ.
Low Temperature Coefficient:
50 ppm/˚C
Enable pin
Fixed output voltages:
1.8, 2.048, 2.5, 3.0, 3.3, 4.096
and 5.0V
n Industrial temperature Range:
−40˚C to +85˚C
n (For extended temperature range, −40˚C to 125˚C,
contact National Semiconductor)
Applications
n
n
n
n
n
n
n
n
n
n
Portable, battery powered equipment
Instrumentation and process control
Automotive & Industrial
Test equipment
Data acquisition systems
Precision regulators
Battery chargers
Base stations
Communications
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
LM4120 Precision Micropower Low Dropout Voltage Reference
February 2000
LM4120
Ordering Information
Industrial Temperature Range (−40˚C to + 85˚C)
Initial Output Voltage Accuracy at 25˚C
And Temperature Coefficient
LM4120 Supplied as
1000 Units, Tape and
Reel
LM4120 Supplied as
3000 Units, Tape and
Reel
Top
Marking
LM4120AIM5-1.8
LM4120AIM5X-1.8
R21A
LM4120AIM5-2.0
LM4120AIM5X-2.0
R14A
LM4120AIM5-2.5
LM4120AIM5X-2.5
R08A
LM4120AIM5-3.0
LM4120AIM5X-3.0
R15A
LM4120AIM5-3.3
LM4120AIM5X-3.3
R16A
LM4120AIM5-4.1
LM4120AIM5X-4.1
R17A
LM4120AIM5-5.0
LM4120AIM5X-5.0
R18A
LM4120IM5-1.8
LM4120IM5X-1.8
R21B
LM4120IM5-2.0
LM4120IM5X-2.0
R14B
LM4120IM5-2.5
LM4120IM5X-2.5
R08B
LM4120IM5-3.0
LM4120IM5X-3.0
R15B
LM4120IM5-3.3
LM4120IM5X-3.3
R16B
LM4120IM5-4.1
LM4120IM5X-4.1
R17B
LM4120IM5-5.0
LM4120IM5X-5.0
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 = ± 0.2%
B = ± 0.5%
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Lead Temperature:
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Voltage on input or
enable pins
−0.3V to 14V
Output Short-Circuit Duration
Indefinite
280˚C/W
Power Dissipation
350 mW
ESD Susceptibility (Note 3)
Human Body Model
Machine Model
Soldering, (10 sec.)
+260˚C
Vapor Phase (60 sec.)
+215˚C
Infrared (15 sec.)
+220˚C
Operating Range (Note 1)
Storage Temperature Range
Power Dissipation (TA = 25˚C) (Note 2):
MA05B package − θJA
LM4120
Absolute Maximum Ratings (Note 1)
−65˚C to +150˚C
Ambient Temperature Range
−40˚C to +85˚C
Junction Temperature Range
−40˚C to +125˚C
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 temperature range.
Symbol
VOUT
Max (Note 5)
Units
Output Voltage Initial
Accuracy
LM4120A-1.800
LM4120A-2.048
LM4120A-2.500
Parameter
Conditions
± 0.2
%
LM4120-1.800
LM4120-2.048
LM4120-2.500
± 0.5
%
TCVOUT/˚C
Temperature Coefficient
−40˚C ≤ TA ≤ +125˚C
∆VOUT/∆VIN
Line Regulation
3.3V ≤ VIN ≤ 12V
∆VOUT/∆ILOAD
VIN−VOUT
VN
Load Regulation
Dropout Voltage (Note 6)
Output Noise Voltage (Note 8)
IS
Supply Current
ISS
Power-down Supply Current
VH
Logic High Input Voltage
VL
Logic Low Input Voltage
Min (Note 5)
Typ (Note 4)
14
50
ppm/˚c
0.0007
0.008
0.01
%/V
0 mA ≤ ILOAD ≤ 1 mA
0.03
0.08
0.17
1 mA ≤ ILOAD ≤ 5 mA
0.01
0.04
0.1
−1 mA ≤ ILOAD ≤ 0 mA
0.04
0.12
−5 mA ≤ ILOAD ≤ −1 mA
0.01
ILOAD = 0 mA
45
65
80
ILOAD = +1 mA
120
150
180
ILOAD = +5 mA
180
210
250
%/mA
mV
0.1 Hz to 10 Hz
20
µVPP
10 Hz to 10 kHz
36
µVPP
160
Enable = 0.4V
−40˚C ≤ TJ ≤ +85˚C
Enable = 0.2V
250
275
1
2
2.4
µA
µA
V
2.4
0.4
V
0.2
IH
Logic High Input Current
7
3
15
µA
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LM4120
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 ≤ T ≤ +85˚C
j
A
temperature range. (Continued)
Symbol
IL
Parameter
Conditions
Min (Note 5)
Logic Low Input Current
Typ (Note 4)
Max (Note 5)
0.1
VIN = 3.3V, VOUT = 0
Units
µA
15
6
30
mA
ISC
Short Circuit Current
Hyst
Thermal Hysteresis
(Note 7)
−40˚C ≤ TA ≤ 125˚C
0.5
mV/V
∆VOUT
Long Term Stability
(Note 9)
1000 hrs. @ 25˚C
100
ppm
VIN = 12V, VOUT = 0
17
6
30
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
VOUT
Max (Note 5)
Units
Output Voltage Initial
Accuracy
LM4120A-3.000
LM4120A-3.300
LM4120A-4.096
LM4120A-5.000
Parameter
Conditions
± 0.2
%
LM4120-3.000
LM4120-3.300
LM4120-4.096
LM4120-5.000
± 0.5
%
TCVOUT/˚C
Temperature Coefficient
−40˚C ≤ TA ≤ +125˚C
∆VOUT/∆VIN
Line Regulation
(VOUT + 1V) ≤ VIN ≤ 12V
∆VOUT/∆ILOAD
VIN−VOUT
VN
Load Regulation
Dropout Voltage (Note 6)
Output Noise Voltage (Note 8)
IS
Supply Current
ISS
Power-down Supply Current
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Min (Note 5)
Typ (Note 4)
14
50
ppm/˚c
0.0007
0.008
0.01
%/V
0 mA ≤ ILOAD ≤ 1 mA
0.03
0.08
0.17
1 mA ≤ ILOAD ≤ 5 mA
0.01
0.04
0.1
−1 mA ≤ ILOAD ≤ 0 mA
0.04
0.12
−5 mA ≤ ILOAD ≤ −1 mA
0.01
ILOAD = 0 mA
45
65
80
ILOAD = +1 mA
120
150
180
ILOAD = +5 mA
180
210
250
%/mA
mV
0.1 Hz to 10 Hz
20
µVPP
10 Hz to 10 kHz
36
µVPP
160
Enable = 0.4V
−40˚C ≤ TJ ≤ +85˚C
Enable = 0.2V
4
250
275
1
2
µA
µA
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
VH
Parameter
Conditions
Min (Note 5)
Logic High Input Voltage
Typ (Note 4)
Max (Note 5)
Units
2.4
V
2.4
VL
Logic Low Input Voltage
0.4
V
0.2
IH
Logic High Input Current
7
IL
Logic Low Input Current
0.1
VOUT = 0
15
µA
µA
15
6
30
mA
ISC
Short Circuit Current
Hyst
Thermal Hysteresis
(Note 7)
−40˚C ≤ TA ≤ 125˚C
0.5
mV/V
∆VOUT
Long Term Stability
(Note 9)
1000 hrs. @ 25˚C
100
ppm
VIN = 12V, VOUT = 0
17
6
30
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 guaranteed 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 TJMAX (maximum junction
temperature), θJ-A (junction to ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX = (TJMAX
− TA)/θJ-A up to the value listed in the Absolute Maximum Ratings.
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 directly 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 VOUT and VIN at which VOUT changes ≤ 1% from VOUT at VIN = 3.3V for 1.8V, 2.0V, 2.5V and VOUT +
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 VOUT is
pulled to a higher voltage than VIN.
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 VOUT. VN for other voltage option is calculated using (VN(1.8V)/1.8) * VOUT. VN (2.5V) = (36µVPP/1.8) * 2.5 = 46µVPP.
Note 9: Long term stability is change in VREF at 25˚C measured continuously during 1000 hrs.
LM4120 Typical Operating Characteristics
Unless otherwise specified, VIN = 3.3V, VOUT = 2.5V,
ILOAD = 0, COUT = 0.022µF, TA = 25˚C and VEN = VIN.
Typical Temperature Drift
Long Term Drift
DS101047-12
Short Circuit Current vs
Temperature
DS101047-13
DS101047-14
5
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LM4120
Electrical Characteristics
LM4120-3.0V, 3.3V, 4.096V and 5.0V
LM4120
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
Dropout Voltage vs Load Current
DS101047-33
Line Regulation
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
DS101047-23
DS101047-22
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Output Impedance vs Frequency
DS101047-24
6
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
Load Step Response
Load Step Response
DS101047-28
Thermal Hysteresis
DS101047-27
DS101047-26
DS101047-25
Line Step Response
DS101047-29
DS101047-30
Enable Pin Current
DS101047-16
DS101047-31
7
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LM4120
LM4120 Typical Operating Characteristics
LM4120
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 capacitors in the range of 0.022µF to 0.047µF. Note that
0.022µF is the minimum required output capacitor. These capacitors typically have an ESR of about 0.1 to 0.5Ω. Smaller
ESR can be tolerated, however larger ESR can not. The output capacitor can be increased to improve load transient response, 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 reference pin is required. This capacitor will typically be in the
50pF range. Care must be taken when using output capacitors 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 entering the LM4120. Larger input capacitors should be tantalum or aluminium.
The reference pin is sensitive to noise, and capacitive loading. 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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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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LM4120
Typical Application Circuits
LM4120
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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LM4120 Precision Micropower Low Dropout Voltage Reference
Physical Dimensions
inches (millimeters) unless otherwise noted
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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 AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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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.
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Americas
Tel: 1-800-272-9959
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Email: [email protected]
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