T YPICAL APPLICATION
D ESCRIPTION Programmable Current Source
The LT ®3092 is a programmable 2-terminal current source. It requires only two resistors to set an output current between 0.5mA and 200mA. A multitude of analog techniques lend themselves to actively programming the output current. The L T3092 is stable without input and output capacitors, offering high DC and AC impedance. This feature allows operation in intrinsically safe applications. The SET pin features 1% initial accuracy and low tem-perature coeffi cient. Current regulation is better than 10ppm/V from 1.5V to 40V .
The L T3092 can operate in a 2-terminal current source confi guration in series with signal lines. It is ideal for driv-ing sensors, remote supplies, and as a precision current limiter for local supplies.
Internal protection circuitry includes reverse-battery and reverse-current protection, current limiting and thermal limiting. The L T3092 is offered in the 8-lead TSOT-23, 3-lead SOT-223 and 8-lead 3mm
× 3mm DFN packages.
Adjustable 2-Terminal Current Source
F EATURES
A PPLICATIONS n
Programmable 2-Terminal Current Source n Maximum Output Current: 200mA n Wide Input Voltage Range: 1.2V to 40V n Input/Output Capacitors Not Required n Resistor Ratio Sets Output Current n Initial Set Pin Current Accuracy: 1%n Reverse-Voltage Protection n Reverse-Current Protection
n <0.001%/V Line Regulation Typical
n Current Limit and Thermal Shutdown Protection n
Available in 8-Lead SOT-23, 3-Lead SOT-223 and 8-Lead 3mm × 3mm DFN Packages
n
2-Terminal Floating Current Source n GND Referred Current Source n Variable Current Source n In-
Line Limiter
n Intrinsic Safety Circuits
SET Pin Current vs Temperature人脸识别atm
问世 3092 TA01a
V IN – V OUT = 1.2V TO 40V I µA R R SOURCE SET
OUT
=10•
TEMPERATURE (°C)
–509.900
S E T P I N C U R R E N T (μA )
9.95010.00010.050–25
25501007512510.1009.925
9.97510.02510.0751503092 TA01b
L , L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
P IN CONFIGURATION
A BSOLUTE MAXIMUM RATINGS IN Pin Voltage Relative to SET , OUT ........................±40V SET Pin Current (Note 6) .....................................±15mA SET Pin Voltage (Relative to OUT , Note 6) ...............±10V Output Short-Circuit Duration ..........................Indefi nite
(Note 1) All Voltages Relative to V OUT
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION TEMPERATURE RANGE L T3092EDD#PBF L T3092EDD#TRPBF LFJD 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C L T3092IDD#PBF L T3092IDD#TRPBF LFJD 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C L T3092EST#PBF L T3092EST#TRPBF 30923-Lead Plastic SOT-223–40°C to 125°C L T3092IST#PBF L T3092IST#TRPBF 30923-Lead Plastic SOT-223–40°C to 125°C L T3092MPST#PBF L T3092MPST#TRPBF 3092MP 3-Lead Plastic SOT-223–55°C to 125°C L T3092ETS8#PBF L T3092ETS8#TRPBF L TFJW 8-Lead Plastic SOT-23–40°C to 125°C L T3092ITS8#PBF L T3092ITS8#TRPBF L TFJW
8-Lead Plastic SOT-23–40°C to 125°C LEAD BASED FINISH TAPE AND REEL PART MARKING*PACKAGE DESCRIPTION TEMPERATURE RANGE L T3092EDD L T3092EDD#TR LFJD 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C L T3092IDD L T3092IDD#TR LFJD 8-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C L T3092EST L T3092EST#TR 30923-Lead Plastic SOT-223–40°C to 125°C L T3092IST L T3092IST#TR 30923-Lead Plastic SOT-223–40°C to 125°C L T3092MPST L T3092MPST#TR 3092MP 3-Lead Plastic SOT-223–55°C to 125°C L T3092ETS8L T3092ETS8#TR L TFJW 8-Lead Plastic SOT-23–40°C to 125°C L T3092ITS8
L T3092ITS8#TR
L TFJW
8-Lead Plastic SOT-23
–40°C to 125°C
Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container .For more information on lead free part marking, go to: www.linear /leadfree/ Operating Junction Temperature Range (Notes 2, 8)
E, I Grades .........................................–40°C to 125°C MP Grade ...........................................–55°C to 125°C Storage Temperature Range ...................–65°C to 150°C Lead Temperature (ST , TS8 Packages Only)
Soldering, 10 sec ..............................................300°C
E LECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum
Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: Unless otherwise specifi ed, all voltages are with respect to V OUT . The L T3092E is tested and specifi ed under pulse load conditions such that T J ≅ T A . The L T3092E is 100% tested at T A = 25°C. Performance at –40°C and 125°C is assured by design, characterization, and correlation with statistical process controls. The L T3092I is guaranteed to meet all data sheet specifi cations over the full –40°C to 125°C operating junction temperature range. The L T3092MP is 100% tested and guaranteed over the –55°C to 125°C operating junction temperature range.
Note 3: Minimum load current is equivalent to the quiescent current of the part. Since all quiescent and drive current is delivered to the output of the part, the minimum load current is the minimum current required to maintain regulation.
PARAMETER CONDITIONS
MIN TYP MAX UNITS SET Pin Current
I SET
V IN = 2V, I LOAD = 1mA
2V ≤ V IN ≤ 40V, 1mA ≤ I LOAD ≤ 200mA l 9.99.81010
10.110.2μA μA Offset Voltage (V OUT – V SET ) V OS V IN = 2V, I LOAD = 1mA V IN = 2V, I LOAD = 1mA l –2–4
24
mV mV Current Regulation (Note 7) ΔI SET ΔV OS ΔI LOAD = 1mA to 200mA ΔI LOAD = 1mA to 200mA l
–0.1–0.5–2nA mV Line Regulation ΔI SET ΔV OS ΔV IN = 2V to 40V, I LOAD = 1mA ΔV IN = 2V to 40V, I LOAD = 1mA 0.030.0030.20.010nA/V mV/V Minimum Load Current (Note 3)2V ≤ V IN ≤ 40V l 300500μA Dropout Voltage (Note 4)I LOAD = 10mA I LOAD = 200mA
l l 1.221.3
1.451.65
V V Current Limit
V IN = 5V, V SET = 0V, V OUT = –0.1V l 200
300mA Reference Current RMS Output Noise (Note 5)10Hz ≤ f ≤ 100kHz
过氧化氢异丙苯0.7nA RMS
Ripple Rejection
f = 120Hz, V RIPPLE = 0.5V P-P , I LOAD = 0.1A,C SET = 0.1μF , C OUT = 2.2μF f = 10kHz f = 1MHz
907520dB dB dB Thermal Regulation
I SET
10ms Pulse
0.003
%/W
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T J = 25°C. (Note 2)
Note 4: For the L T3092, dropout is specifi ed as the minimum input-to-output voltage differential required supplying a given output current. Note 5: Adding a small capacitor across the reference current resistor lowers output noise. Adding this capacitor bypasses the resistor shot noise and reference current noise (see the Applications Information section).Note 6: Diodes with series 1k resistors clamp the SET pin to the OUT pin. These diodes and resistors only carry current under transient overloads.Note 7: Current regulation is Kelvin-sensed at the package.
Note 8: This IC includes overtemperature protection that protects the device during momentary overload conditions. Junction temperature exceeds the maximum operating junction temperature when
overtemperature protection is active. Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability.
TEMPERATURE (°C)
–50–2.0
O F F S E T V O L T A G E (m V )
–1.00.01.0–25
2550100751252.0–1.5
–0.50.51.5150
3092 G03
INPUT-TO-OUTPUT VOL TAGE (V)
0–1.00
O F F S E T V O L T A G E (m V )
–0.5000.505
1015203025351.00–0.75
–0.250.250.7540
3092 G05
TEMPERATURE (°C)–509.900
S E T P I N C U R R E N T (μA )
9.9259.97510.00010.02510.10010.0750
50753092 G01
9.95010.050–25
25100125
150SET PIN CURRENT DISTRIBUTION (μA)
10.203092 G02
9.901010.10
9.80
V OS DISTRIBUTION (mV)
2
北京东方集团3092 G04
–101
–2
LOAD CURRENT (mA)
–400
O F F S E T V O L T A G E (μV )
–350–250–200–150100–50100
3092 G06
–3000
50
–10050150
200
T YPICAL PERFORMANCE CHARACTERISTICS Offset Voltage Distribution
Offset Voltage
Offset Voltage
Current Regulation
SET Pin Current
SET Pin Current Distribution
Offset Voltage (V OUT – V SET )罗汉鱼天下
TEMPERATURE (o C)
–50–80
C H A N G E I N R E F E R E N C E C U R R E N T W I T H L O A
D (n A )
–70–50–40–3020
–100
50753092 G07
–60010–20–25
25100125150
TEMPERATURE (°C)–500
M I N I M U M O U T P U T C U R R E N T (μA )
2003004006000
50753092 G08
100500–25
25100125
150LOAD CURRENT (mA)
0D R O P O U T V O L T A G E (V I N – V O U T ) (V )
0.40.81.225
50751001501251751.6
0.20.61.01.42003092 G09
TEMPERATURE (°C)–500
D R O P O U T V O L T A G
E (V I N – V O U T ) (V )
0.40.60.81.41.20
50753092 G10
0.2
电流源1.0–25
25100125
150INPUT-TO-OUTPUT DIFFERENTIAL VOL TAGE (V)
00
C U R R E N T L I M I T (m A )10020030024
68
1040050150250350
3092 G11
TEMPERATURE (°C)–500
C U R R E N T L I M I T (m A )
50
1502002505003500
50753092 G12
100400450300–25
25100
150TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit
Line T ransient Response
Line T ransient Response
Dropout Voltage
Dropout Voltage
Current Limit
Minimum Output Current
TIME (μs)
3092 G13
I N P U T V O L T A G E (V )
OUTPUT CURRENT DEVIATION (mA)
820406046–1.0
0–0.50.5
1.01.5
2103080100
5070901mA CURRENT SOURCE CONFIGURATION
TIME (μs)
103092 G14
0I N P U T V O L T A G E (V )
OUTPUT CURRENT DEVIATION (mA)
820406046–10
0–55102
103080100
50709010mA CURRENT SOURCE CONFIGURATION
R TEST (Ω)
O U T P U T V O L T A G E (m V )
80070060050040030020010003092 G17
2000
1000
FREQUENCY (Hz)
0.01
R E F E R E N C E C U R R E N T N O I S E S P E C T R A L D E N S I T Y (p A /√H z )
100
10k 100k
100
10
1k 3092 G19
1
0.1
10
TYPICAL PERFORMANCE CHARACTERISTICS
Residual Output for Less Than Minimum Output Current
Output Impedance
Noise Spectral Density
Turn-On Response
Turn-On Response
FREQUENCY (Hz)
O U T P U T I M P E D A N C E (Ω)中国海商法协会 100
1k 10k 100k 1M
10M
10
1001k 100M
10M 1011G 100k 10k 1M 3092 G18
TIME (μs)
8
3092 G15
I N P U T V O L T A G E (V )
OUTPUT CURRENT (mA)
6102030240
0.51.00
5
154050
2535451mA CURRENT SOURCE CONFIGURATION
TIME (μs)
83092 G16
I N P U T V O L T A G E (V )
OUTPUT CURRENT (mA)
6102030240
510150
5
154050
25354510mA CURRENT SOURCE CONFIGURATION
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议