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PDF ( 数据手册 , 数据表 ) LM4128

零件编号 LM4128
描述 SOT-23 Precision Micropower Series Voltage Reference
制造商 National Semiconductor
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LM4128 数据手册, 描述, 功能
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November 2006
LM4128
SOT-23 Precision Micropower Series Voltage Reference
General Description
Ideal for space critical applications, the LM4128 precision
voltage reference is available in the SOT-23 surface-mount
package. The LM4128’s advanced design eliminates the
need for an external stabilizing capacitor while ensuring sta-
bility with capacitive loads up to 10 µF, thus making the
LM4128 easy to use.
Series references provide lower power consumption than
shunt references, since they do not have to idle the maximum
possible load current under no load conditions. This advan-
tage, the low quiescent current (60 µA), and the low dropout
voltage (400 mV) make the LM4128 ideal for battery-powered
solutions.
The LM4128 is available in four grades (A, B, C, and D) for
greater flexibility. The best grade devices (A) have an initial
accuracy of 0.1% with guaranteed temperature coefficient of
75 ppm/°C or less, while the lowest grade parts (D) have an
initial accuracy of 1.0% and a tempco of 100 ppm/°C.
Features
Output voltage initial accuracy 0.1%
Low temperature coefficient 75 ppm/°C
Low Supply Current, 60 µA
Enable pin allowing a 3 µA shutdown mode
Up to 20 mA output current
Voltage options 1.8V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V
Custom voltage options available (1.8V to 4.096V)
VIN range of VREF + 400 mV to 5.5V @10 mA
Stable with low ESR ceramic capacitors
SOT23-5 Package
−40°C to 125°C junction temperature range
Applications
Instrumentation & Process Control
Test Equipment
Data Acquisition Systems
Base Stations
Servo Systems
Portable, Battery Powered Equipment
Automotive & Industrial
Precision Regulators
Battery Chargers
Communications
Medical Equipment
Typical Application Circuit
*Note: The capacitor CIN is required and the capacitor COUT is optional.
© 2006 National Semiconductor Corporation 202110
20211001
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LM4128 pdf, 数据表
Electrical Characteristics LM4128-4.1 (VOUT = 4.096V) Limits in standard type are for TJ = 25°
C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified.
Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most
likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and
ILOAD = 0A.
Symbol
Parameter
Conditions
Min Typ Max
(Note 4) (Note 5) (Note 4)
Unit
VREF
Output Voltage Initial Accuracy
LM4128A-4.1
(A Grade - 0.1%)
-0.1 +0.1 %
LM4128B-4.1
(B Grade - 0.2%)
-0.2 +0.2
LM4128C-4.1
(C Grade - 0.5%)
-0.5 +0.5
LM4128D-4.1
(D Grade - 1.0%)
-1.0 +1.0
TCVREF / °C (Note Temperature Coefficient
6)
LM4128A-4.1
LM4128B-4.1
LM4128C-4.1
75
75
ppm / °C
100
LM4128D-4.1
100
IQ Supply Current
60 100
IQ_SD
Supply Current in Shutdown
EN = 0V
37
ΔVREFVIN Line Regulation
VREF + 400 mV VIN 5.5V
100
ΔVREFILOAD Load Regulation
0 mA ILOAD 20 mA
25 120
ΔVREF
Long Term Stability (Note 7)
Thermal Hysteresis (Note 8)
1000 Hrs
-40°C TJ +125°C
50
75
VIN - VREF
Dropout Voltage (Note 9)
ILOAD = 10 mA
175 400
VN Output Noise Voltage
0.1 Hz to 10 Hz
350
ISC Short Circuit Current
75
VIL Enable Pin Maximum Low Input Level
35
VIH Enable Pin Minimum High Input Level
65
µA
µA
ppm / V
ppm / mA
ppm
mV
µVPP
mA
%V
%V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics.
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. θJ-A for SOT23-5 package is 220°C/W, TJMAX = 125°C.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kresistor into each pin.
Note 4: Limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality
Control.
Note 5: Typical numbers are at 25°C and represent the most likely parametric norm.
Note 6: Temperature coefficient is measured by the "Box" method; i.e., the maximum ΔVREF is divided by the maximum ΔT.
Note 7: Long term stability is VREF @25°C measured during 1000 hrs.
Note 8: Thermal hysteresis is defined as the change in +25°C output voltage before and after cycling the device from (-40°C to 125°C).
Note 9: Dropout voltage is defined as the minimum input to output differential at which the output voltage drops by 0.5% below the value measured with a 5V
input.
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8







LM4128 equivalent, schematic
Notes
THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION
(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY
OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO
SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,
IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT.
TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT
NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL
PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR
APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND
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NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.
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PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL
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Life support devices or systems are devices 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
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Copyright© 2006 National Semiconductor Corporation
For the most current product information visit us at www.national.com
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