LM4121AIM5X-ADJ/NOPB 数据手册
LM4121
www.ti.com
SNVS073C – APRIL 2000 – REVISED APRIL 2013
LM4121 Precision Micropower Low Dropout Voltage Reference
Check for Samples: LM4121
FEATURES (LM4121-1.2)
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Small SOT23-5 Package
Low Voltage Operation
High Output Voltage Accuracy: 0.2%
Source and Sink Current Output: ±5 mA
Supply current: 160 μA Typ.
Low Temperature Coefficient: 50 ppm/°C
Enable Pin
Output Voltages: 1.25V and Adjustable
Industrial Temperature Range: −40°C to +85°C
(For Extended Temperature Range, −40°C to
125°C, Contact Texas Instruments)
APPLICATIONS
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Portable, Battery Powered Equipment
Instrumentation and Process Control
Automotive & Industrial
Test Equipment
Data Acquisition Systems
Precision Regulators
Battery Chargers
Base Stations
Communications
Medical Equipment
DESCRIPTION
The LM4121 is a precision bandgap voltage
reference available in a fixed 1.25V and adjustable
version with up to 5 mA current source and sink
capability.
This series reference operates with input voltages as
low as 1.8V and up to 12V consuming 160 µA (Typ.)
supply current. In power down mode, device current
drops to less than 2 μA.
The LM4121 comes in two grades A and Standard.
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 ensured from
−40°C to +125°C.
The very low operating voltage, low supply current
and power-down capability of the LM4121 makes this
product an ideal choice for battery powered and
portable applications.
The device performance is ensured over the industrial
temperature range (−40°C to +85°C), while certain
specs are ensured over the extended temperature
range (−40°C to +125°C). Please contact Texas
Instruments for full specifications over the extended
temperature range. The LM4121 is available in a
standard 5-pin SOT-23 package.
Block Diagram
* Resistors are removed on the LM4121-ADJ
†LM4121-ADJ only
Figure 1. LM4121-1.2 Block Diagram
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated
LM4121
SNVS073C – APRIL 2000 – REVISED APRIL 2013
www.ti.com
Connection Diagrams
Figure 2. SOT23-5 Surface Mount Package
Figure 3. SOT23-5 Surface Mount Package
Table 1. SOT-23 Package Marking Information (1)
Field Information
First Field:
R = Reference
Second and third Field:
19 = 1.250V Voltage Option
20 = Adjustable
Fourth Field:
A-B = Initial Reference Voltage Tolerance
A = ±0.2%
B = ±0.5%
(1)
Only four fields of marking are possible on the SOT-23's small surface. This table gives the meaning of the four fields.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1) (2)
−0.3V to 14V
Maximum Voltage on input or enable pins
Output Short-Circuit Duration
Power Dissipation (TA = 25°C)
Indefinite
(3)
:
DBV0005B package − θJA
280°C/W
Power Dissipation
350 mW
ESD Susceptibility (4)
Human Body Model
Machine Model
2 kV
200V
Lead Temperature:
(1)
(2)
(3)
(4)
2
Soldering, (10 sec.)
+260°C
Vapor Phase (60 sec.)
+215°C
Infrared (15 sec.)
+220°C
“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 ensure specific performance limits. For ensured specifications and test
conditions, see Electrical Characteristics - LM4121-1.250V and Electrical Characteristics - LM4121-ADJ tables. The ensured
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated
under the listed test conditions.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
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.
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.
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Operating Range
(1)
−65°C to +150°C
Storage Temperature Range
Ambient Temperature Range
−40°C to +85°C
Junction Temperature Range
−40°C to +125°C
(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 ensure specific performance limits. For ensured specifications and test
conditions, see Electrical Characteristics - LM4121-1.250V and Electrical Characteristics - LM4121-ADJ tables. The ensured
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated
under the listed test conditions.
Electrical Characteristics
LM4121-1.250V
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
Parameter
Conditions
Min
(1)
Output Voltage Initial
Accuracy
LM4121A-1.250
Typ
(2)
1.250
LM4121-1.250
Temperature
Coefficient
−40°C ≤ TA ≤ +125°C
ΔVOUT/ΔVIN
Line Regulation
1.8V ≤ VIN ≤ 12V
Load Regulation
0.0007
0.009
0.012
%/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
1.5
VN
Output Noise Voltage
0.1 Hz to 10 Hz
20
IS
Supply Current
ISS
Power-down Supply
Current
10 Hz to 10 kHz
VIN = 12V
Enable = 0.4V
Enable = 0.2V
Logic High Input
Voltage
1.6
VL
Logic Low Input
Voltage
0.4
IH
Logic High Input
Current
7
IL
Logic Low Input
Current
0.1
(2)
(3)
µVPP
µVRMS
250
275
µA
1
2
µA
1.5
V
V
6
VIN = 12V, VOUT = 0
−40°C ≤ TA ≤ 125°C
15
µA
µA
15
30
mA
17
6
(1)
V
0.2
VIN = 3.3V, VOUT = 0
(3)
%/mA
1.8
30
160
VH
Thermal Hysteresis
%
ppm/°c
ILOAD = 5mA
Hyst
±0.2
50
Minimum Operating
Voltage
Short Circuit Current
Units
14
Min-VIN
ISC
(1)
±0.5
TCVOUT/°C
ΔVOUT/ΔILOAD
Max
30
0.5
mV/V
Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical
Quality Control (SQC) methods. The limits are used to calculate TI's Averaging Outgoing Quality Level (AOQL).
Typical numbers are at 25°C and represent the most likely parametric norm.
Thermal hysteresis is defined as the change in +25°C output voltage before and after exposing the device to temperature extremes.
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Electrical Characteristics
LM4121-1.250V (continued)
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
ΔVOUT
(4)
Parameter
Long Term Stability
(4)
Conditions
Min
(1)
1000 hrs. @ 25°C
Typ
(2)
Max
(1)
100
Units
ppm
Long term stability is change in VREF at 25°C measured continuously during 1000 hrs.
Electrical Characteristics
LM4121-ADJ
Unless otherwise specified VIN = 3.3V, VOUT = VREF, 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 = VREF
Parameter
Conditions
Min
(1)
Output Voltage Initial
Accuracy
LM4121A-ADJ
Typ
(2)
1.216
LM4121-ADJ
Temperature
Coefficient
−40°C ≤ TA ≤ +125°C
ΔVREF/ΔVIN
Line Regulation
1.8V ≤ VIN ≤ 12V
Load Regulation
ppm/°c
0.0007
0.009
0.012
%/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
0.01
Min-VIN
ILOAD = 5 mA
1.5
VN
Output Noise Voltage
0.1 Hz to 10 Hz
20
IS
Supply Current
ISS
Power-down Supply
Current
10 Hz to 10 kHz
Reference Pin Bias
Current
VH
Logic High Input
Voltage
VL
%
50
−5 mA ≤ ILOAD ≤ −1 mA
IBIAS
±0.2
Units
14
Minimum Operating
Voltage
(3)
(1)
±0.5
TCVREF/°C
ΔVOUT/ΔILOAD
Max
VIN = 12V
Enable = 0.4V
Enable = 0.2V
V
µVPP
30
160
(4)
1.8
%/mA
µVRMS
250
275
µA
1
2
µA
15
40
nA
1.6
1.5
V
Logic Low Input
Voltage
0.4
V
IH
Logic High Input
Current
7
IL
Logic Low Input
Current
0.1
0.2
VOUT = 0
ISC
Short Circuit Current
(2)
(3)
(4)
4
µA
µA
15
6
VIN = 12V, VOUT = 0
30
17
6
(1)
15
mA
30
Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical
Quality Control (SQC) methods. The limits are used to calculate TI's Averaging Outgoing Quality Level (AOQL).
Typical numbers are at 25°C and represent the most likely parametric norm.
Output noise for 1.25V option. Noise is proportional to VOUT.
Bias Current flows out of the Adjust pin.
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Electrical Characteristics
LM4121-ADJ (continued)
Unless otherwise specified VIN = 3.3V, VOUT = VREF, 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
(1)
Typ
(2)
Max
(1)
Units
Hyst
Thermal Hysteresis
−40°C ≤ TA ≤ 125°C
0.5
mV/V
ΔVOUT
Long Term Stability
1000 hrs. @ 25°C
100
ppm
(5)
(6)
(5)
(6)
Thermal hysteresis is defined as the change in +25°C output voltage before and after exposing the device to temperature extremes.
Long term stability is change in VREF at 25°C measured continuously during 1000 hrs.
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LM4121
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LM4121- (All Options) Typical Operating Characteristics
Unless otherwise specified, VIN = 3.3V, VOUT = 1.25V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
6
Minimum Input Voltage
vs
Temperature
GND Pin Current
vs
VIN
Figure 4.
Figure 5.
GND Pin Current at No Load
vs
Temperature
GND Pin Current
vs
Load
Figure 6.
Figure 7.
Short Circuit
vs
Temperature
Output Impedance
vs
Frequency
Figure 8.
Figure 9.
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LM4121- (All Options) Typical Operating Characteristics (continued)
Unless otherwise specified, VIN = 3.3V, VOUT = 1.25V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
PSRR
vs
Frequency
Enable Pin Current
Figure 10.
Figure 11.
Start-Up Response
Enable Response
Figure 12.
Figure 13.
Load Step Response
Load Step Response
Figure 14.
Figure 15.
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LM4121- (All Options) Typical Operating Characteristics (continued)
Unless otherwise specified, VIN = 3.3V, VOUT = 1.25V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
8
Line Step Response
Noise Spectural Density (0.1Hz-10Hz)
Figure 16.
Figure 17.
Noise Spectural Density (10Hz-10kHz)
Thermal Hysteresis
Figure 18.
Figure 19.
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LM4121-1.25 Typical Operating Characteristics
Unless otherwise specified, VIN = 3.3V, VOUT = 1.25V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
Typical Temperature Drift
Long Term Drift
Figure 20.
Figure 21.
Line Regulation
Load Regulation
Figure 22.
Figure 23.
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LM4121
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LM4121-ADJ Typical Operating Characteristics
Unless otherwise specified, VIN = 3.3V, VOUT = 1.2V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
10
Typical Temperature Drift
Long Term Drift
Figure 24.
Figure 25.
Dropout Voltage
vs
Output Error
Dropout Voltage
vs
Load Current
Figure 26.
Figure 27.
Line Regulation
Load Regulation
Figure 28.
Figure 29.
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LM4121-ADJ Typical Operating Characteristics (continued)
Unless otherwise specified, VIN = 3.3V, VOUT = 1.2V, ILOAD = 0, COUT = 0.022µF, TA = 25°C and VEN = VIN.
Adjust Pin Bias Current
Change In Reference Voltage
vs
Output Voltage
Figure 30.
Figure 31.
Bode Plot
Bode Plot
Figure 32.
Figure 33.
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LM4121
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PIN DESCRIPTIONS
Output (Pin 5)
Input (Pin 4)
Reference Output.
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 (1.25V option only). This pin should be left unconnected for 1.25V option.
Adj (Pin 1)
VOUT Adj Pin (Adjustable option only). See Application Hints section.
APPLICATION HINTS
The standard application circuit for the LM4121 is shown in Figure 34. The output voltage is set with the two
feedback resistors, according to the following formula:
VOUT = [Vref(1+ R1/R2] − Ibias• R1
(1)
Values for R1 and R2 should be chosen to be less than 1 MΩ. Ibias typically flows out of the adjust pin. Values for
Vref and Ibias are found in the Electrical Characteristics - LM4121-1.250V and Electrical Characteristics - LM4121ADJ tables. For best accuracy, be sure to take into account the variation of VREF with input voltage, load and
output voltage.
The LM4121 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 (Adj) 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. Also, when the
LM4121 is used as a controller, with external active components, each application must be carefully tested to
ensure a stable design. The adjust pin is sensitive to noise and capacitive loading. The trace to this pin must be
as short as possible and the feedback resistors should be close to this pin. Also, a single point ground to the
LM4121 will help ensure good accuracy at high load currents.
An input capacitor is typically not required. However, a 0.1µF ceramic can be used to help prevent line transients
from entering the LM4121. Larger input capacitors should be tantalum or aluminium.
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 Electrical Characteristics - LM4121-1.250V and
Electrical Characteristics - LM4121-ADJ tables 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.
Figure 34. Standard Application Circuit
12
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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.
Typical Application Circuits
VIN
2.2PF
+
VIN
EN
ADJ
VOUT
2N3904
LM4121-ADJ
R1
GND
R2
0.022PF
VO
VO = 1.216
(RR
1
2
+ 1
)
Figure 35. Voltage Reference with Negative Output
Figure 36. 100mA Quasi-LDO Regulator
Figure 37. Boosted Output Current with
Negative Voltage Reference
Figure 38. Voltage Reference with Complimentary
Output
(+)
VIN
EN
VOUT
ADJ
LM4121-ADJ
GND
0.022PF
I
R
I=
1.216
(-)
R
Figure 39. Two Terminal Constant Current Source
Figure 40. Precision Voltage Reference
with Force and Sense Output
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VCC = 2.5-5V
2.2PF
+
VIN
EN
LM4121-ADJ
VOUT
ADJ
IN
OUT
GND
3.4k
0.022PF
HYST
Figure 41. Programmable Current Source
#
50mV
51:
Figure 42. Precision Comparator with Hysteresis
VBATT
12.1k
VIN
EN
VOUT
ADJ
LM4121-ADJ
GND
+
0.022PF
10k
2.2PF
3.3:
LED = ON @
LED = OFF @
Figure 43. Power Supply Splitter
# 2.7V
# 2.8V
Figure 44. Li + Low Battery Detector
100k
EN
ADJ
+
+6V
VIN
VOUT
LM4121-ADJ
+
GND
2.2PF
0.022PF
47PF
TON
TOFF
#
#
(
47PF
6 - 1.3
100k
)
47PF
1.3
( 100k
)
. (0.15)
#4
7
1:
. (0.15)
Figure 45. Flasher Circuit
14
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REVISION HISTORY
Changes from Revision B (April 2013) to Revision C
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 14
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PACKAGE OPTION ADDENDUM
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10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LM4121AIM5-1.2/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R19A
LM4121AIM5-ADJ/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R20A
LM4121AIM5X-ADJ/NOPB
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R20A
LM4121IM5-1.2/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R19B
LM4121IM5-ADJ/NOPB
ACTIVE
SOT-23
DBV
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R20B
LM4121IM5X-ADJ/NOPB
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-40 to 85
R20B
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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