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Part: LM285LP-1.2
Category:
Power Management
-> Voltage References
Description: Micropower Voltage References
Company: Texas Instruments, Inc.
Datasheet: Download LM285LP-1.2 datasheet File size : 634 kB
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Datasheet text preview:
LM285-1.2, LM385-1.2, LM385B-1.2 MICROPOWER VOLTAGE REFERENCES
SLVS075C APRIL 1989 REVISED JULY 1999
D D D D D
D
Operating Current Range LM285 . . . 10 µA to 20 mA LM385 . . . 15 µA to 20 mA LM385B . . . 15 µA to 20 mA 1% and 2% Initial Voltage Tolerance Reference Impedance LM385 . . . 1 Max at 25°C All Devices . . . 1.5 Max Over Full Temperature Range Very Low Power Consumption Applications: Portable Meter References Portable Test Instruments Battery-Operated Systems Current-Loop Instrumentation Panel Meters Designed to be Interchangeable With National LM285-1.2 and LM385-1.2
D PACKAGE (TOP VIEW)
NC NC NC ANODE
1 2 3 4
8 7 6 5
CATHODE NC NC NC
LP PACKAGE (TOP VIEW)
ANODE CATHODE NC
NCNo internal connection
description
These micropower, two-terminal, band-gap voltage references operate over a 10-µA to 20-mA current range and feature exceptionally low dynamic impedance and good temperature stability. On-chip trimming provides tight voltage tolerance. The band-gap reference for these devices has low noise and long-term stability. The design makes these devices exceptionally tolerant of capacitive loading and thus, easier to use in most reference applications. The wide dynamic operating temperature range accommodates varying current supplies with excellent regulation. The extremely low power drain of this series makes them useful for micropower circuitry. These voltage references can be used to make portable meters, regulators, or general-purpose analog circuitry, with battery life approaching shelf life. The wide operating current range allows them to replace older references with tighter-tolerance parts. The LM285-1.2 is characterized for operation from 40°C to 85°C. The LM385-1.2 and LM385B-1.2 are characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS TA 0°C to 70°C to 70°C 40°C to 85°C VZ TOLERANCE 2% 1% 1% PACKAGED DEVICES SMALL OUTLINE (D) LM385D-1.2 LM385BD-1.2 LM285D-1.2 PLASTIC (LP) LM385LP-1.2 LM385BLP-1.2 LM285LP-1.2 LM385Y-1.2 CHIP FORM FORM (Y)
The D package is available taped and reeled. Add the suffix R to the device type (e.g., LM385DR-1-2). The chip form is tested at TA = 25°C. For ordering purposes, the decimal point in the part number must be replaced with a hyphen (i.e., show the -1.2 suffix as "-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.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1999, Texas Instruments Incorporated
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LM285-1.2, LM385-1.2, LM385B-1.2 MICROPOWER VOLTAGE REFERENCES
SLVS075C APRIL 1989 REVISED JULY 1999
symbol
ANODE CATHODE
schematic
CATHODE Q13 7.5 k 600 k Q12 Q7 Q4 Q11 50 k Q3 Q1 20 pF Q2 Q5 20 pF Q9 Q10 300 k
200 k
Q6
Q8 Q14
100 k
500
60 k ANODE
NOTE A: Component values shown are nominal.
absolute maximum ratings over operating free-air temperature range
Reverse current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA Forward current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA Package thermal impedance, JA (see Notes 1 and 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . 197°C/W LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) TA)/JA. Operation at the absolute maximum TJ of 150°C can impact reliability. 2. The package thermal impedance is calculated in accordance with JESD51, except for through-hole packages which use a trace length of zero.
recommended operating conditions
MIN Reference current, IZ Operating free-air temperature range, TA free air temperature range LM285-1.2 LM385-1.2, LM385B-1.2 0.01 40 0 MAX 20 85 70 UNIT mA °C
2
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LM285-1.2, LM385-1.2, LM385B-1.2 MICROPOWER VOLTAGE REFERENCES
SLVS075C APRIL 1989 REVISED JULY 1999
electrical characteristics at specified free-air temperature
PARAMETER VZ Reference voltage Average temperature coefficient of reference voltage§ Change in in reference voltage with current Long-term change in reference voltage Minimum reference current Reference impedance IZ = 100 µA, µ, f = 25 Hz TEST CONDITIONS IZ = I(min) to 20 mA TA 25°C LM285-1.2 MIN 1.223 TYP 1.235 MAX 1.247 LM385-1.2 MIN 1.21 TYP 1.235 MAX 1.26 LM385B-1.2 MIN 1.223 TYP 1.235 MAX 1.247 UNIT V
VZ
IZ = I(min) to 20 mA
25°C
±20
±20
±20
ppm/°C
VZ
IZ = I(min) ( ) to 1 mA IZ = 1 mA to 20 mA
25°C Full range 25°C Full range 25°C ±20
1 1.5 12 30 ±20
1 1.5 20 30 ±20
1 1.5 20 30 mV
VZ/t
IZ = 100 µA
ppm/khr
IZ(min)
Full range 25°C Full range 25°C
8 0.2
10 0.6 1.5
8 0.4
15 1 1.5
8 0.4
15 1 1.5
µA µV
zz
Vn
IZ = 100 µA, Broadband f = 10 Hz to noise voltage 10 kHz
60
60
60
Full range is 40°C to 85°C for the LM285-1.2, and 0°C to 70°C for the LM385-1.2 and LM385B-1.2. I(min) = 10 µA for the LM285-1.2 and 15 µA for the LM385-1.2 and LM385B-1.2. § The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.
electrical characteristics, TA = 25°C
PARAMETER VZ VZ VZ VZ/t IZ(min) zz Vn Reference voltage Average temperature coefficient of reference voltage§ Change in reference voltage with current in reference voltage with current Long-term change in reference voltage Minimum reference current Reference impedance Broadband noise voltage IZ = 100 µA IZ = 100 µA, f = 10 Hz to 10 kHz TEST CONDITIONS CONDITIONS IZ = 15 µA to 20 mA IZ = 15 µA to 20 mA IZ = 15 µA to 1 mA IZ = 1 mA to 20 mA IZ = 100 µA ±20 8 0.4 60 15 1 LM385Y-1.2 MIN 1.21 TYP 1.235 ±20 1 20 MAX 1.26 UNIT V ppm/°C mV ppm/khr µA µV
§ The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature range.
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3
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