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LT1460S3 (SOT-23) Family of Micropower Series References in SOT-23
FEATURES
s s s s s s s s s s
DESCRIPTIO
s
3-Lead SOT-23 Package Low Drift: 20ppm/C Max High Accuracy: 0.2% Max Low Supply Current 20mA Output Current Guaranteed No Output Capacitor Required Reverse-Battery Protection Low PC Board Solder Stress: 0.02% Typ Voltage Options: 2.5V, 3V, 3.3V, 5V and 10V The LT1460 is Also Available in SO-8, 8-Lead MSOP, 8-Lead PDIP and TO-92 Packages. Operating Temperature Range: - 40C to 85C
APPLICATIO S
s s s s s
Handheld Instruments Precision Regulators A/D and D/A Converters Power Supplies Hard Disk Drives
The LT (R)1460S3 is a family of SOT-23 micropower series references that combine high accuracy and low drift with low power dissipation and small package size. These series references use curvature compensation to obtain low temperature coefficient, and laser trimmed precision thin-film resistors to achieve high output accuracy. Furthermore, output shift due to PC board soldering stress has been dramatically reduced. These references will supply up to 20mA, making them ideal for precision regulator applications, yet they are almost totally immune to input voltage variations. These series references provide supply current and power dissipation advantages over shunt references that must idle the entire load current to operate. Additionally, the LT1460S3 does not require an output compensation capacitor. This feature is important in applications where PC board space is a premium or fast settling is demanded. Reversebattery protection keeps these references from conducting reverse current.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Typical Distribution of SOT-23 LT1460HC VOUT After IR Reflow Solder
32
Basic Connection
LT1460S3 VOUT + 0.9V VIN 20V C1 0.1F IN GND
1460S3 TA01
28 LT1460HC LIMITS 24
DISTRIBUTION (%)
20 16 12 8 4 0 - 0.3 - 0.2 - 0.1 0.1 0.2 0 OUTPUT VOLTAGE ERROR (%) 0.3
OUT
VOUT
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1460S3 TA02
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LT1460S3 (SOT-23)
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage ........................................................... 30V Reverse Voltage .................................................... - 15V Output Short-Circuit Duration, TA = 25C .............. 5 sec Specified Temperature Range ..................... 0C to 70C Operating Temperature Range (Note 2) ............................................. - 40C to 85C Storage Temperature Range (Note 3) ... - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER LT1460HCS3-2.5 LT1460JCS3-2.5 LT1460KCS3-2.5 LT1460HCS3-3 LT1460JCS3-3 LT1460KCS3-3 LT1460HCS3-3.3 LT1460JCS3-3.3 LT1460KCS3-3.3 LT1460HCS3-5 LT1460JCS3-5 LT1460KCS3-5 LT1460HCS3-10 LT1460JCS3-10 LT1460KCS3-10 S3 PART MARKING LTAC LTAD LTAE LTAN LTAP LTAQ LTAR LTAS LTAT LTAK LTAL LTAM LTAU LTAV LTAW
TOP VIEW IN 1 3 GND OUT 2 S3 PACKAGE 3-LEAD PLASTIC SOT-23
TJMAX = 125C, JA = 325C/ W
Consult factory for Industrial and Military grade parts.
AVAILABLE OPTIO S
OUTPUT VOLTAGE (V) 2.5 2.5 2.5 3 3 3 3.3 3.3 3.3 5 5 5 10 10 10 SPECIFIED TEMPERATURE RANGE 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C ACCURACY (%) 0.2 0.4 0.5 0.2 0.4 0.5 0.2 0.4 0.5 0.2 0.4 0.5 0.2 0.4 0.5 TEMPERATURE COEFFICIENT (ppm/C) 20 20 50 20 20 50 20 20 50 20 20 50 20 20 50 PART ORDER NUMBER LT1460HCS3-2.5 LT1460JCS3-2.5 LT1460KCS3-2.5 LT1460HCS3-3 LT1460JCS3-3 LT1460KCS3-3 LT1460HCS3-3.3 LT1460JCS3-3.3 LT1460KCS3-3.3 LT1460HCS3-5 LT1460JCS3-5 LT1460KCS3-5 LT1460HCS3-10 LT1460JCS3-10 LT1460KCS3-10
2
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WW
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LT1460S3 (SOT-23)
The q denotes specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER Output Voltage Tolerance (Note 4) CONDITIONS LT1460HCS3 LT1460JCS3 LT1460KCS3 Output Voltage Temperature Coefficient (Note 5) LT1460HCS3 LT1460JCS3 LT1460KCS3 VOUT + 0.9V VIN VOUT + 2.5V
q q q q
ELECTRICAL CHARACTERISTICS
MIN - 0.2 - 0.4 - 0.5
TYP
MAX 0.2 0.4 0.5
UNITS % % % ppm/C ppm/C ppm/C ppm/V ppm/V ppm/V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mA ppm/mW V V V mA A ppm (P-P) ppm (RMS) ppm/kHr ppm ppm
10 10 25 150 50
20 20 50 800 1000 100 130 3000 4000 200 300 70 100 10 0.9 1.3 1.4
Line Regulation
VOUT + 2.5V VIN 20V
q
Load Regulation Sourcing (Note 6)
IOUT = 100A
q
1000 50
q
IOUT = 10mA IOUT = 20mA
q
20 2.5
q q
Thermal Regulation (Note 7) Dropout Voltage (Note 8)
P = 200mW VIN - VOUT, VOUT 0.2%, IOUT = 0 VIN - VOUT, VOUT 0.2%, IOUT = 10mA
Output Current Reverse Leakage Output Voltage Noise (Note 9) Long-Term Stability of Output Voltage (Note 10) Hysteresis (Note 11) Supply Current
Short VOUT to GND VIN = - 15V 0.1Hz f 10Hz 10Hz f 1kHz T = 0C to 70C T = -40C to 85C LT1460S3-2.5
q q q q
40 0.5 4 4 100 50 250 115 145
q
10
145 175 180 220 180 220 200 240 270 350
A A A A A A A A A A
LT1460S3-3 LT1460S3-3.3
q
145 160
q
LT1460S3-5 LT1460S3-10
q
215
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1460S3 is guaranteed functional over the operating temperature range of - 40C to 85C. Note 3: If the parts are stored outside of the specified temperature range, the output may shift due to hysteresis.
Note 4: ESD (Electrostatic Discharge) sensitive devices. Extensive use of ESD protection devices are used internal to the LT1460S3, however, high electrostatic discharge can damage or degrade the device. Use proper ESD handling precautions. Note 5: Temperature coefficient is measured by dividing the change in output voltage by the specified temperature range. Incremental slope is also measured at 25C.
3
LT1460S3 (SOT-23)
ELECTRICAL CHARACTERISTICS
Note 6: Load regulation is measured on a pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 7: Thermal regulation is caused by die temperature gradients created by load current or input voltage changes. This effect must be added to normal line or load regulation. This parameter is not 100% tested. Note 8: Excludes load regulation errors. Note 9: Peak-to-peak noise is measured with a single pole highpass filter at 0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment to eliminate thermocouple effects on the leads. The test time is 10 sec. RMS noise is measured with a single pole highpass filter at 10Hz and a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified and then integrated for a fixed period, making the final reading an average as opposed to RMS. A correction factor of 1.1 is used to convert from average to RMS and a second correction of 0.88 is used to correct for the nonideal bandpass of the filters. Note 10: Long-term stability typically has a logarithmic characteristic and therefore, changes after 1000 hours tend to be much smaller than before that time. Total drift in the second thousand hours is normally less than one third that of the first thousand hours with a continuing trend toward reduced drift with time. Long-term stability will also be affected by differential stresses between the IC and the board material created during board assembly. Note 11: Hysteresis in output voltage is created by package stress that differs depending on whether the IC was previously at a higher or lower temperature. Output voltage is always measured at 25C, but the IC is cycled to 70C or 0C before successive measurements. Hysteresis is roughly proportional to the square of the temperature change. Hysteresis is not normally a problem for operational temperature excursions where the instrument might be stored at high or low temperature. See Applications Information.
TYPICAL PERFORMANCE CHARACTERISTICS
2.5V Minimum Input-Output Voltage Differential
100
OUTPUT VOLTAGE CHANGE (mV)
Characteristic curves are similar for most LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
10
125C
25C 1 - 55C
0.1 0 0.5 1.0 1.5 2.0 INPUT-OUTPUT VOLTAGE (V) 2.5
4
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1460S3 G01
2.5V Load Regulation, Sourcing
0 - 0.5 - 1.0 - 55C - 1.5 - 2.0 25C - 2.5 125C - 3.0 - 3.5 - 4.0 0.1 1 10 OUTPUT CURRENT (mA) 100
1460s3 G02
2.5V Load Regulation, Sinking
120 100 80 60 25C 40 20 0 0 1 2 3 4 OUTPUT CURRENT (mA) 5
1460S3 G03
125C
- 55C
LT1460S3 (SOT-23) TYPICAL PERFORMANCE CHARACTERISTICS
2.5V Output Voltage Temperature Drift
2.503 2.502
SUPPLY CURRENT (A)
Characteristic curves are similar for most LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output. 2.5V Supply Current vs Input Voltage
250 25C
OUTPUT VOLTAGE (V)
THREE TYPICAL PARTS
OUTPUT VOLTAGE (V)
2.501 2.500 2.499 2.498 2.497 -50 -25
50 25 75 0 TEMPERATURE (C)
2.5V Power Supply Rejection Ratio vs Frequency
80
POWER SUPPLY REJECTION RATIO (dB)
70
OUTPUT IMPEDANCE ()
60 50 40 30 20 10 0 0.1 1 10 100 FREQUENCY (kHz) 1000
1460S3 G07
100
CL = 0.1F
LOAD CURRENT (mA)
2.5V Output Voltage Noise Spectrum
1000
100 10 100 1k 10k FREQUENCY (Hz) 100k
1460-2.5 G10
1460S3 G11
OUTPUT NOISE (20V/DIV)
NOISE VOLTAGE (nV/Hz)
UW
100
2.5V Line Regulation
2.502 2.501 25C 2.500 2.499 2.498 125C 2.497 2.496 2.495 - 55C - 55C
200
125C 150
100
50
125
0
2.494 0 5 10 INPUT VOLTAGE (V) 15 20
1460S3 G05
0
2
4
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
1460S3 G06
1460S3 G04
2.5V Output Impedance vs Frequency
1000 CL = 0F
2.5V Transient Response
20
10
10 CL = 1F 1
1
0.1 200s/DIV CLOAD = 0F
1460S3 G09
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1000
1460S3 G08
2.5V Output Noise 0.1Hz to 10Hz
TIME (2 SEC/DIV)
5
LT1460S3 (SOT-23) TYPICAL PERFORMANCE CHARACTERISTICS
10V Minimum Input-Output Voltage Differential
100
OUTPUT VOLTAGE CHANGE (mV)
Characteristic curves are similar for most LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
OUTPUT VOLTAGE CHANGE (mV)
OUTPUT CURRENT (mA)
10
125C
25C 1 - 55C
0.1 0 0.5 1.0 1.5 2.0 INPUT-OUTPUT VOLTAGE (V) 2.5
10V Output Voltage Temperature Drift
10.006 10.004 10.002 10.000 9.998 9.996 9.994 9.992 9.990 9.988 9.986 9.984 9.982 - 50 - 25 50 25 0 75 TEMPERATURE (C) 100 125 THREE TYPICAL PARTS
SUPPLY CURRENT (A)
OUTPUT VOLTAGE (V)
250 125C 200 150 100 50 0 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
1460S3 G16
OUTPUT VOLTAGE (V)
10V Power Supply Rejection Ratio vs Frequency
100
1000
POWER SUPPLY REJECTION RATIO (dB)
90
70 60 50 40 30 20 10 0 0.1 1 10 100 FREQUENCY (kHz) 1000
1460S3 G18
OUTPUT IMPEDANCE ()
100 CL = 0.1F
LOAD CURRENT (mA)
80
6
UW
1460S3 G12
10V Load Regulation, Sourcing
35 30 25 20 15 10 5 0 -5 -10 0.1 - 55C 125C 25C 100
1460S3 G13
10V Load Regulation, Sinking
250
200 125C 150 25C 100 -55C 50
1 10 OUTPUT CURRENT (mA)
0
0
1
3 4 2 OUTPUT CURRENT (mA)
5
1460S3 G14
10V Supply Current vs Input Voltage
350 300 25C - 55C
10.010 10.005 10.000 9.995 9.990 9.985 9.980
10V Line Regulation
25C - 55C 125C
6
8
14 12 16 10 INPUT VOLTAGE (V)
18
20
1460S3 G15
1560S3 G17
10V Output Impedance vs Frequency
CL = 0F
10V Transient Response
20
10
10
1
CL = 1F 1
0.1 200s/DIV CLOAD = 0F
1460S3 G20
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1000
1460S3 G19
LT1460S3 (SOT-23) TYPICAL PERFORMANCE CHARACTERISTICS
10V Output Voltage Noise Spectrum
10
Characteristic curves are similar for most LT1460S3s. Curves from the LT1460S3-2.5 and the LT1460-10 represent the extremes of the voltage options. Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
1
0.1 0.01
0.1
1 10 FREQUENCY (kHz)
100
1460S3 G10
OUTPUT NOISE (20V/DIV)
NOISE VOLTAGE (V/Hz)
APPLICATIONS INFORMATION
Longer Battery Life Series references have a large advantage over older shunt style references. Shunt references require a resistor from the power supply to operate. This resistor must be chosen to supply the maximum current that can ever be demanded by the circuit being regulated. When the circuit being controlled is not operating at this maximum current, the shunt reference must always sink this current, resulting in high dissipation and short battery life. The LT1460S3 series references do not require a current setting resistor and can operate with any supply voltage from VOUT + 0.9V to 20V. When the circuitry being regulated does not demand current, the LT1460S3s reduce their dissipation and battery life is extended. If the references are not delivering load current, they dissipate only several mW, yet the same connection can deliver 20mA of load current when demanded. Capacitive Loads The LT1460S3 family of references are designed to be stable with a large range of capacitive loads. With no capacitive load, these references are ideal for fast settling or applications where PC board space is a premium. The test circuit shown in Figure 1 is used to measure the response time and stability of various load currents and load capacitors. This circuit is set for the 2.5V option. For other voltage options, the input voltage must be scaled up and the output voltage generator offset voltage must be adjusted. The 1V step from 2.5V to 1.5V produces a current step of 10mA or 1mA for RL = 100 or RL = 1k. Figure 2 shows the response of the reference to these 1mA and 10mA load steps with no load capacitance, and Figure 3 shows a 1mA and 10mA load step with a 0.1F output capacitor. Figure 4 shows the response to a 1mA load step with CL = 1F and 4.7F.
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10V Output Noise 0.1Hz to 10Hz
TIME (2 SEC/DIV)
1460S3 G22
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VIN = 2.5V CIN 0.1F
LT1460S3-2.5
VOUT CL
RL VGEN 2.5V 1.5V
1460S3 F01
Figure 1. Response Time Test Circuit
7
LT1460S3 (SOT-23)
APPLICATIONS INFORMATION
VGEN 2.5V 1.5V VOUT
VOUT
1s/DIV
1460S3 F02
Figure 2. CL = 0F
VGEN
VOUT
VOUT
100s/DIV
1460S3-5 F03
Figure 3. CL = 0.1F
VGEN
VOUT
VOUT
ppm
100s/DIV
1460S3 F04
Figure 4. IOUT = 1mA
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1F
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1mA
Table 1 gives the maximum output capacitance for various load currents and output voltages to avoid instability. Load capacitors with low ESR (effective series resistance) cause more ringing than capacitors with higher ESR such as polarized aluminum or tantalum capacitors.
Table 1. Maximum Output Capacitance
VOLTAGE OPTION IOUT = 100A 2.5V 3V 3.3V 5V 10V >10F >10F >10F >10F >10F
10mA
IOUT = 1mA >10F >10F >10F >10F 1F
IOUT = 10mA 2F 2F 1F 1F 0.15F
IOUT = 20mA 0.68F 0.68F 0.68F 0.68F 0.1F
2.5V 1.5V 1mA
Long-Term Drift Long-term drift cannot be extrapolated from accelerated high temperature testing. This erroneous technique gives drift numbers that are widely optimistic. The only way long-term drift can be determined is to measure it over the time interval of interest. The LT1460S3 long-term drift data was taken on over 100 parts that were soldered into PC boards similar to a "real world" application. The boards were then placed into a constant temperature oven with TA = 30C, their outputs were scanned regularly and measured with an 8.5 digit DVM. Figure 5 shows typical long-term drift of the LT1460S3s.
150 100 50
10mA
2.5V 1.5V
4.7F
0 - 50 -100 -150 0 100 200 300 400 500 600 700 800 900 1000 HOURS
1460S3 F05
Figure 5. Typical Long-Term Drift
LT1460S3 (SOT-23)
APPLICATIONS INFORMATION
Hysteresis Hysteresis data shown in Figure 5 and Figure 6 represents the worst-case data taken on parts from 0C to 70C and from - 40C to 85C. The output is capable of dissipating relatively high power, i.e., for the LT1460S3-2.5, PD = 17.5V * 20mA = 350mW. The thermal resistance of the SOT-23 package is 325C/W and this dissipation causes a 114C internal rise producing a junction temperature of TJ = 25C + 114C = 139C. This elevated temperature will cause the output to shift due to thermal hysteresis. For highest performance in precision applications, do not let the LT1460S3's junction temperature exceed 85C. Fast Turn-On It is recommended to add a 0.1F or larger bypass capacitor to the input pin of the LT1460S3s. Although this can help stability with large load currents, another reason is for proper start-up. The LT1460S3 can start in 10s, but it is important to limit the dv/dt of the input. Under light load conditions and with a very fast input, internal nodes overslew and this requires finite recovery time. Figure 8 shows the result of no bypass capacitance on the input and no output load on the LT1460S3-5. In this case the supply dv/dt is 7.5V in 30ns which causes internal overslew, and the output does not bias to 5V until 40s after turn-on. Although 40s is a typical turn-on time, it can be much longer. Figure 9 shows the effect of a 0.1F bypass capacitor which limits the input dv/dt to approximately 7.5V in 20s. The part always starts quickly.
18 16 14
WORST-CASE HYSTERESIS ON 40 UNITS
NUMBER OF UNITS
12 10 70C TO 25C 8 6 4 2 0 -240 -200 -160 -120 - 80 -40 0 40 HYSTERESIS (ppm) 80 120 160 200 240 VOUT
1460S3 F06
0C TO 25C 7.5V 0V
Figure 6. 0C to 70C Hysteresis
20s/DIV 9 8 7
1460S3 F08
WORST-CASE HYSTERESIS ON 34 UNITS 85C TO 25C -40C TO 25C
NUMBER OF UNITS
6 5 4 3 2 1 0 -600 -500 -400 -300 -200 -100 0 100 200 300 400 500 600 HYSTERESIS (ppm)
1460S3 F07
Figure 7. - 40C to 85C Hysteresis
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VIN
0V
Figure 8. CIN = 0F
VIN
7.5V 0V
VOUT
20s/DIV
1460S3 F08
Figure 9. CIN = 0.1F
9
LT1460S3 (SOT-23)
APPLICATIONS INFORMATION
Output Accuracy Like all references, either series or shunt, the error budget of the LT1460S3s is made up of primarily three components: initial accuracy, temperature coefficient and load regulation. Line regulation is neglected because it typically contributes only 150ppm/V. The LT1460S3s typically shift 0.02% when soldered into a PCB, so this is also neglected. The output errors are calculated as follows for a 100A load and 0C to 70C temperature range: LT1460HCS3 Initial Accuracy = 0.2% For IOUT = 100A VOUT = (4000ppm/mA)(0.1mA) = 0.04% For Temperature 0C to 70C the maximum T = 70C VOUT = (20ppm/C)(70C) = 0.14% Total worst-case output error is: 0.2% + 0.04% + 0.14% = 0.380% Table 2 gives the worst-case accuracy for LT1460HCS3, LT1460JCS3 and LT1460KCS3 from 0C to 70C, and shows that if the LT1460HCS3 is used as a reference instead of a regulator, it is capable of 8 bits of absolute accuracy over temperature without a system calibration.
Table 2. Worst-Case Output Accuracy over Temperature
IOUT 0A 100A 10mA 20mA LT1460HCS3 0.340% 0.380% 0.640% 0.540% LT1460JCS3 0.540% 0.580% 0.840% 0.740% LT1460KCS3 0.850% 0.890% 1.15% 1.05%
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LT1460S3 (SOT-23)
PACKAGE DESCRIPTION
REF
0.55 (0.022)
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. JEDEC REFERENCE IS TO-236 VARIATION AB
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Dimensions in millimeters (inches) unless otherwise noted.
S3 Package 3-Lead Plastic SOT-23
(LTC DWG # 05-08-1631)
2.80 - 3.04 (0.110 - 0.120)
0.45 - 0.60 (0.017 - 0.024) 2.10 - 2.64 (0.083 - 0.104) 1.20 - 1.40 (0.047 - 0.060) 0.013 - 0.10 (0.0005 - 0.004)
0.95 0.037 BSC 1.92 0.075 BSC 0.89 - 1.12 (0.035 - 0.044)
0.09 - 0.18 (0.004 - 0.007)
0.37 - 0.51 (0.015 - 0.020)
SOT-23 0599
11
LT1460S3 (SOT-23)
TYPICAL APPLICATIONS
Handling Higher Load Currents
V+ 40mA
*SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT. LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION
Boosted Output Current with No Current Limit
V + (VOUT + 1.8V) R1 220 2N2905 IN LT1460S3 OUT GND VOUT 100mA 2F SOLID TANT
+
RELATED PARTS
PART NUMBER LT1019 LT1027 LT1236 LT1461 LT1634 LTC1798 DESCRIPTION Precision Bandgap Reference Precision 5V Reference Precision Low Noise Reference Micropower Precision Low Dropout Micropower Precision Shunt Reference 1.25V, 2.5V Output Micropower Low Dropout Reference, Fixed or Adjustable COMMENTS 0.05% Max, 5ppm/C Max 0.02%, 2ppm/C Max 0.05% Max, 5ppm/C Max, SO Package 0.04% Max, 3ppm/C Max, 50mA Output Current 0.05%, 25ppm/C Max 0.15% Max, 40ppm/C, 6.5A Max Supply Current
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
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47F IN LT1460S3 OUT GND RL TYPICAL LOAD CURRENT = 50mA 10mA VOUT R1*
R1 =
V + - VOUT 40mA
1460S3 TA05
Boosted Output Current with Current Limit
V+ VOUT + 2.8V
+
47F
D1* LED
R1 220
+
8.2 2N2905 47F
IN LT1460S3 OUT GND VOUT 100mA 2F SOLID TANT
1460S3 TA04
+
1460S3 TA03
* GLOWS IN CURRENT LIMIT, DO NOT OMIT
1460s3f LT/TP 0999 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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