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ISL21060 Precision Reference with Disable
Data Sheet September 30, 2009 FN6706.4
Precision, Low Noise FGATM Voltage References
The ISL21060 FGATM voltage references are low power, high precision voltage references fabricated on Intersil's proprietary Floating Gate Analog technology. A new disable feature allows the device to shut down the output and reduce supply current drain from 15A operating to <500nA. The ISL21060 family features guaranteed initial accuracy as low as 1.0mV with drift down to 10ppm/C. Noise is typically 10VP-P (10Hz BW). This combination of high initial accuracy, low power and low output noise performance of the ISL21060 enables versatile high performance control and data acquisition applications with low power consumption.
Features
* Reference Output Voltage . . . . . . . . . . . . 2.048V, 2.500V, 3.000V, 3.300V, 4.096V * Initial Accuracy . . . . . . . . . . . . . . . . . . . . .1.0mV, 2.5mV * Input Voltage Range - ISL21060-20 . . . . . . . . . . . . . . . . . . . . . . . . 2.5V to 5.5V - ISL21060-25 . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V - ISL21060-30 . . . . . . . . . . . . . . . . . . . . . . . . 3.2V to 5.5V - ISL21060-33 . . . . . . . . . . . . . . . . . . . . . . . . 3.5V to 5.5V - ISL21060-41 . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 5.5V * Output Voltage Noise . . . . . . . . . 10VP-P (0.1Hz to 10Hz) * Supply Current . . . . . . . . . . . . . . . . . . . . . . . . .40A (Max) * Tempco. . . . . . . . . . . . . . . . . . . . . . . 10ppm/C, 25ppm/C
Pinout
ISL21060 (6 LD SOT-23) TOP VIEW
NC GND EN 1 2 3 6 5 4 VOUTF VOUTS
* Output Current Capability. . . . . . . . . . . . . . +10.0mA/-5mA * Operating Temperature Range. . . . . . . . . -40C to +125C * Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Ld SOT-23 * Pb-Free (RoHS compliant)
Applications
VIN
* High Resolution A/Ds and D/As * Digital Meters * Bar Code Scanners * Basestations * Battery Management/Monitoring * Industrial/Instrumentation Equipment
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2008, 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL21060 Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 PIN NAME NC GND EN VIN VOUTS VOUTF DESCRIPTION No Connect; Do Not Connect Ground Connection Enable Input. Active High. Do not Float. Input Voltage Connection Voltage Reference Output Connection (Sense) Voltage Reference Output Connection (Force)
Ordering Information
PART NUMBER (Note) ISL21060BFH620Z-TK* ISL21060CFH620Z-TK* ISL21060BFH625Z-TK* ISL21060CFH625Z-TK* ISL21060BFH630Z-TK* ISL21060CFH630Z-TK* ISL21060CFH633Z-TK* ISL21060BFH641Z-TK* ISL21060CFH641Z-TK* PART MARKING GACB GACD GAEA GAGA GAHA GAJA GAPA GACC GACE VOUT OPTION (V) 2.048 2.048 2.500 2.500 3.000 3.000 3.300 4.096 4.096 GRADE (mV) 1.0 2.5 1.0 2.5 1.0 2.5 2.5 1.0 2.5 TEMP. RANGE (ppm/C) 10 25 10 25 10 25 25 10 25 PACKAGE (Pb-Free) 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 6 Ld SOT-23 PKG. DWG. # MDP0038 MDP0038 MDP0038 MDP0038 MDP0038 MDP0038 MDP0038 MDP0038 MDP0038
*Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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FN6706.4 September 30, 2009
ISL21060
Absolute Voltage Ratings
Max Voltage VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6.5V VOUT to GND (10s). . . . . . . . . . . . . . . . . . . . . .-0.5V to VOUT + 1V Voltage on "DNC" pins . . . . . No connections permitted to these pins ESD Rating Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5500V Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .550V Charged Device Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV
Thermal Information
Thermal Resistance (Typical, Note 1) JA (C/W) 6 Ld SOT-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 Continuous Power Dissipation (TA = +70C, Note 3) Storage Temperature Range . . . . . . . . . . . . . . . . . -65C to +150C 6 Ld SOT-23, derate 5.88mW/C above +70C . . . . . . . . . . . . . . . . . . . . . . . . . 471mW Pb-free Reflow Profile (Note 2). . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Temperature Range (Industrial) . . . . . . . . . . . . . . . .-40C to +125C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
NOTE: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 2. Post-reflow drift for the ISL21060 devices will range from 100V to 1.0mV based on experimental results with devices tested in sockets and also on FR4 multi-layer PC boards. The design engineer must take this into account when considering the reference voltage after assembly.
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21060-20, VOUT = 2.048V) VIN = 3.0V, TA = -40C to +125C, IOUT = 0, unless otherwise specified.
CONDITIONS MIN TYP 2.048 ISL21060B20 ISL21060C20 -1.0 -2.5 +1.0 +2.5 10 25 2.5 VEN = VIN 2.5V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -5mA IOUT 0mA 16 50 3 150 50 300 75 10 2.5 60 100 100 5.5 40 150 50 400 MAX UNIT V mV mV ppm/C ppm/C V A V/V V/mA V/mA mA s dB VP-P VRMS nV/Hz ppm ppm
DESCRIPTION
VOUT Accuracy @ TA = +25C
TC VOUT
Output Voltage Temperature Coefficient (Note 3) Input Voltage Range Supply Current Line Regulation Load Regulation
ISL21060B ISL21060C
VIN IIN VOUT /VIN VOUT/IOUT
ISC tR
Short Circuit Current Turn-on Settling Time Ripple Rejection
TA = +25C, VOUT tied to GND VOUT = 0.1% f = 10kHz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C
eN VN
Output Voltage Noise Broadband Voltage Noise Noise Density
VOUT/TA VOUT/t
Thermal Hysteresis (Note 4) Long Term Stability (Note 5)
OUTPUT DISABLE VENH VENL IINSD Enable Logic High (ON) Enable Logic Low (OFF) Shutdown Supply Current VEN 0.35V 0.4 1.6 0.8 1.5 V V A
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FN6706.4 September 30, 2009
ISL21060
Electrical Specifications
PARAMETER VOUT VOA Output Voltage VOUT Accuracy @ TA = +25C ISL21060B25 ISL21060C25 TC VOUT Output Voltage Temperature Coefficient (Note 3) Input Voltage Range Supply Current Line Regulation Load Regulation VEN = VIN 2.7V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -5mA IOUT 0mA ISC tR Short Circuit Current Turn-on Settling Time Ripple Rejection eN VN Output Voltage Noise Broadband Voltage Noise Noise Density VOUT/TA VOUT/t Thermal Hysteresis (Note 4) Long Term Stability (Note 5) TA = +25C, VOUT tied to GND VOUT = 0.1% f = 10kHz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C ISL21060B ISL21060C 2.7 16 50 3 130 50 300 75 10 2.5 60 100 100 -1.0 -2.5
(ISL21060-25, VOUT = 2.500V) VIN = 3.0V, TA = -40C to +125C, IOUT = 0, unless otherwise specified.
CONDITIONS MIN TYP 2.500 +1.0 +2.5 10 25 5.5 40 150 150 400 MAX UNIT V mV mV ppm/C ppm/C V A V/V V/mA V/mA mA s dB VP-P VRMS nV/Hz ppm ppm
DESCRIPTION
VIN IIN VOUT /VIN VOUT/IOUT
OUTPUT DISABLE VENH VENL IINSD Enable Logic High (ON) Enable Logic Low (OFF) Shutdown Supply Current VEN 0.35V 0.4 1.6 0.8 1.5 V V A
Electrical Specifications
PARAMETER VOUT VOA
(ISL21060-30, VOUT = 3.000V) VIN = 3.5V, TA = -40C to +125C, IOUT = 0, unless otherwise
specified. CONDITIONS MIN TYP 3.000 ISL21060B30 ISL21060C30 -1.0 -2.5 +1.0 +2.5 10 25 3.2 VEN = VIN 3.2V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -5mA IOUT 0mA 16 50 3 130 50 300 75 10 2.5 5.5 40 150 50 400 MAX UNIT V mV mV ppm/C ppm/C V A V/V V/mA V/mA mA s dB VP-P VRMS
DESCRIPTION Output Voltage VOUT Accuracy @ TA = +25C
TC VOUT
Output Voltage Temperature Coefficient (Note 3) Input Voltage Range Supply Current Line Regulation Load Regulation
ISL21060B ISL21060C
VIN IIN VOUT /VIN VOUT/IOUT
ISC tR
Short Circuit Current Turn-on Settling Time Ripple Rejection
TA = +25C, VOUT tied to GND VOUT = 0.1% f = 10kHz 0.1Hz f 10Hz 10Hz f 1kHz
eN VN
Output Voltage Noise Broadband Voltage Noise
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FN6706.4 September 30, 2009
ISL21060
Electrical Specifications
PARAMETER
(ISL21060-30, VOUT = 3.000V) VIN = 3.5V, TA = -40C to +125C, IOUT = 0, unless otherwise
specified. (Continued) CONDITIONS f = 1kHz TA = +165C TA = +25C MIN TYP 60 100 100 MAX UNIT nV/Hz ppm ppm
DESCRIPTION Noise Density
VOUT/TA VOUT/t
Thermal Hysteresis (Note 4) Long Term Stability (Note 5)
OUTPUT DISABLE VENH VENL IINSD Enable Logic High (ON) Enable Logic Low (OFF) Shutdown Supply Current VEN 0.35V 0.4 1.6 0.8 1.5 V V A
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21060-33, VOUT = 3.300V) VIN = 5.0V, TA = -40C to +125C, IOUT = 0, unless otherwise specified.
DESCRIPTION CONDITIONS MIN TYP 3.300 ISL21060C33 -2.5 +2.5 25 3.5 EN = VIN 3.5V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -5mA IOUT 0mA 18 20 10 120 50 300 75 10 2.5 60 100 100 5.5 40 150 50 400 MAX UNIT V mV ppm/C V A V/V V/mA V/mA mA s dB VP-P VRMS nV/Hz ppm ppm
VOUT Accuracy @ TA = +25C
Output Voltage Temperature Coefficient ISL21060C (Note 3) Input Voltage Range Supply Current Line Regulation Load Regulation
ISC tR
Short Circuit Current Turn-on Settling Time Ripple Rejection
TA = +25C, VOUT tied to GND VOUT = 0.1% f = 10kHz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C
eN VN
Output Voltage Noise Broadband Voltage Noise Noise Density
VOUT/TA VOUT/t
Thermal Hysteresis (Note 4) Long Term Stability (Note 5)
OUTPUT DISABLE VENH VENL IINSD Enable Logic High (ON) Enable Logic Low (OFF) Shutdown Supply Current VEN 0.35V 0.4 1.6 0.8 1.5 V V A
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FN6706.4 September 30, 2009
ISL21060
Electrical Specifications
PARAMETER VOUT VOA Output Voltage VOUT Accuracy @ TA = +25C ISL21060B41 ISL21060C41 TC VOUT Output Voltage Temperature Coefficient (Note 3) Input Voltage Range Supply Current Line Regulation Load Regulation EN = VIN 4.3V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -5mA IOUT 0mA ISC tR Short Circuit Current Turn-on Settling Time Ripple Rejection eN VN Output Voltage Noise Broadband Voltage Noise Noise Density VOUT/TA VOUT/t Thermal Hysteresis (Note 4) Long Term Stability (Note 5) TA = +25C, VOUT tied to GND VOUT = 0.1% f = 10kHz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C ISL21060B ISL21060C 4.3 20 50 10 130 50 300 75 10 2.5 60 100 100 -1.0 -2.5
(ISL21060-41, VOUT = 4.096V) VIN = 5.0V, TA = -40C to +125C, IOUT = 0, unless otherwise specified.
DESCRIPTION CONDITIONS MIN TYP 4.096 +1.0 +2.5 10 25 5.5 40 150 50 400 MAX UNIT V mV mV ppm/C ppm/C V A V/V V/mA V/mA mA s dB VP-P VRMS nV/Hz ppm ppm
VIN IIN VOUT /VIN VOUT/IOUT
OUTPUT DISABLE VENH VENL IINSD NOTES: 3. Over the specified temperature range. Temperature coefficient is measured by the box method whereby the change in VOUT is divided by the temperature range; in this case, -40C to +125C = +165C. 4. Thermal Hysteresis is the change of VOUT measured @ TA = +25C after temperature cycling over a specified range, TA. VOUT is read initially at TA = +25C for the device under test. The device is temperature cycled and a second VOUT measurement is taken at +25C. The difference between the initial VOUT reading and the second VOUT reading is then expressed in ppm. For TA = +165C, the device under test is cycled from +25C to +125C to -40C to +25C. 5. Long term drift is logarithmic in nature and diminishes over time. Drift after the first 1000 hours will be approximately 10ppm/1khrs. Enable Logic High (ON) Enable Logic Low (OFF) Shutdown Supply Current VEN 0.35V 0.4 1.6 0.8 1.5 V V A
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-30) (REXT = 100k)
3.0020 3.0015 3.0010 3.0005 VOUT (V) 3.0000 UNIT 1 2.9995 2.9990 2.9985 2.9980 -40 -20 0 20 40 60 80 100 120 UNIT 3 UNIT 2 IIN (A) 14 13 +25C 12 11 10 3.0 3.5 4.0 VIN (V) 4.5 5.0 5.5 -40C 17 16 15 +125C
TEMPERATURE (C)
FIGURE 1. VOUT vs TEMPERATURE, 3 UNITS
FIGURE 2. IIN vs VIN, 3 TEMPERATURES
2.0 1.8 1.6 1.4 1.2 IIN (A) +125C
100 90 80 70 60 IIN (A) 50 40 30 +25C 20 10 -40C 0 1 2 VIN (V) 3 4 5 0 0 1 2 3 VENABLE (V) 4 5 6 +125C +25C -40C
1.0 0.8 0.6 0.4 0.2 0.0
FIGURE 3. IIN vs VIN [SLEEP MODE], 3 TEMPERATURES
FIGURE 4. IIN vs VENABLE, 3 TEMPERATURES
1.2 20 1.0 +125C 0.8 VOUT (mV) 0.6 0.4 0.2 0.0 -0.2 -10 -40C +25C VOUT (V) (NORMALIZED TO VIN = 5V) -10 -40 -70 -100 -130 -160 3.0 -40C +125C +25C
-5
0
5
3.5
4.0 VIN (V)
4.5
5.0
5.5
OUTPUT CURRENT (mA)
FIGURE 5. LOAD REGULATION
FIGURE 6. LINE REGULATION OVER-TEMPERATURE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-30) (REXT = 100k) (Continued)
3.30 +125C 3.25 DROPOUT VOLTAGE (V) 3.20 +25C 3.15 3.10 3.05 -40C 3.00 2.95 -10 -8 -6 -4 -2 0 PSRR (dB) 0 -10 -20 -30 -40 -50 NO LOAD -60 10nF -70 -80 10 100 1k 1nF 10k 100k 1M
LOAD CURRENT (mA)
FREQUENCY (Hz)
FIGURE 7. LOAD CURRENT vs DROPOUT
FIGURE 8. PSRR AT DIFFERENT CAPACITIVE LOADS
100 90 80 70 ZOUT () 60 50 40 30 20 10 0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 10nF CH2 LOW -500mV 1nF NO LOAD CH2 HIGH 4.80V
FIGURE 9. ZOUT vs FREQUENCY
FIGURE 10. TURN-ON TIME, NO LOAD
CH2 HIGH 4.80V
CH2 LOW -500mV
FIGURE 11. TURN-ON TIME, 1k
FIGURE 12. LOAD TRANSIENT RESPONSE, 1nF LOAD CAPACITANCE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-30) (REXT = 100k) (Continued)
FIGURE 13. LOAD TRANSIENT RESPONSE, 100nF LOAD CAPACITANCE
FIGURE 14. LINE TRANSIENT RESPONSE, 1nF LOAD
3.5 3.0 2.5 2.0 VOUT (V) 1.5 1.0 0.5 0.0 -0.5 0 1 2 3 VEN (V) 4 5 6 +25C -40C +125C
FIGURE 15. LINE TRANSIENT RESPONSE, 100nF
FIGURE 16. VOUT vs VENABLE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-41) (REXT = 100k)
4.100 4.099 4.098 VOUT (V) 4.097 4.096 4.095 4.094 4.093 4.092 -40 UNIT 3 UNIT 2 UNIT 1 IIN (A) 25 24 23 22 21 20 19 18 17 16 10 60 110 15 4.3 4.5 4.7 4.9 VIN (V) 5.1 5.3 5.5 UNIT 2 UNIT 1 UNIT 3
TEMPERATURE (C)
FIGURE 17. VOUT vs TEMPERATURE, 3 UNITS
FIGURE 18. IIN vs VIN, 3 TEMPERATURES
0.6 0.5 0.4 +25C IIN (A) 0.3 0.2 0.1 0.0 0 2 VIN (V) 4 6 IIN (A) +125C
100 90 80 70 60 50 40 30 20 10 0 0 2 VENABLE (V) 4 6 +125C +25C -40C
-40C
FIGURE 19. IIN vs VIN[SLEEP MODE], 3 TEMPERATURES
FIGURE 20. IIN vs VENABLE, 3 TEMPERATURES
0.8 0.6 0.4 VOUT (mV) 0.2 0 -0.2 -40C -0.4 -0.6 -12 +25C VOUT (V) (NORMALIZED TO VIN = 5V)
75 +125C +25C -25 -40C -75
25
+125C
-125
-10
-8
-6
-4
-2
0
2
4
6
-175 4.0
4.2
4.4
4.6
4.8 VIN (V)
5.0
5.2
5.4
5.6
LOAD CURRENT (mA)
FIGURE 21. LOAD REGULATION
FIGURE 22. LINE REGULATION OVER-TEMPERATURE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-41) (REXT = 100k)
4.40 4.35 DROPOUT VOLTAGE (V) 4.30 4.25 4.20 4.15 4.10 4.05 -8 -40C +25C PSRR (dB)
(Continued)
0
-10 +125C -20 -30 -40 -50 -60 -70 -4 -3 -2 -1 0 -80 10
1nF
NO LOAD
10nF
-7
-6
-5
100
1k
10k
100k
1M
LOAD CURRENT (mA)
FREQUENCY (Hz)
FIGURE 23. LOAD CURRENT vs DROPOUT
FIGURE 24. PSRR AT DIFFERENT CAPACITIVE LOADS
160 140 120 100 ZOUT () 80 10nF 60 40 20 0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 100nF NO LOAD 1nF CH2 PK-PK -5.17V
FIGURE 25. ZOUT vs FREQUENCY
FIGURE 26. TURN-ON TIME, NO LOAD
: 8.20V @: 6.84V
CH2 PK-PK 5.90V
CH2 PK-PK 2.12V
FIGURE 27. TURN-ON TIME, 1k
FIGURE 28. LOAD TRANSIENT RESPONSE, 100nF LOAD CAPACITANCE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-41) (REXT = 100k)
(Continued)
: 2.05V @: 1.66V CH2 PK-PK 1.48V
CH2 PK-PK 2.12V
FIGURE 29. LOAD TRANSIENT RESPONSE, 1nF LOAD CAPACITANCE
FIGURE 30. LINE TRANSIENT RESPONSE, 1nF LOAD
: 2.05V @: 1.66V 4.5 CH2 PK-PK 1.52V 4.0 3.5 3.0 VOUT (V) 2.5 2.0 1.5 1.0 +125C 0.5 0.0 0 1 2 3 VENABLE (V) 4 5 6 -40C
FIGURE 31. LINE TRANSIENT RESPONSE, 100nF LOAD CAPACITANCE
FIGURE 32. VOUT vs VENABLE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-25) (REXT = 100k)
2.5030 2.5025 2.5020 2.5015 VOUT (V) 2.5010 2.5005 2.5000 2.4995 2.4990 2.4985 2.4980 -50 0 50 TEMPERATURE (C) 100 150 UNIT 3 UNIT 2 IIN (A) UNIT 1
16 15 14 +25C 13 12 -40C 11 10 9 8 2.5 3.0 3.5 4.0 4.5 VIN (V) 5.0 5.5 6.0 +125C
FIGURE 33. VOUT vs TEMPERATURE, 3 UNITS
FIGURE 34. IIN vs VIN, 3 TEMPERATURES
0.6 0.5 0.4 IIN (A) 0.3 0.2 0.1 +25C IIN (A)
90 80 +125C +25C 70 60 50 40 30 20 10 +125C -40C
-40C
0.0 0 1 2 3 VIN (V) 4 5 6
0 0
1
2
3 VENABLE (V)
4
5
6
FIGURE 35. IIN vs VIN [SLEEP MODE], 3 TEMPERATURES
FIGURE 36. IIN vs VENABLE, 3 TEMPERATURES
0.6 0.5 0.4 0.3 VOUT (mV) VOUT (V) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -12 -10 -8 +125C LOAD REGULATION NORMALIZED TO VOUT WITH NO LOAD -6 -4 -2 0 2 4 6 +25C -40C
50 LINE REGULATION NORMALIZED AT VIN = 5 0 +125C -50 +25C
-100 -40C -150
-200 2.5
3.0
3.5
4.0 VIN (V)
4.5
5.0
5.5
6.0
LOAD CURRENT (mA)
FIGURE 37. LOAD REGULATION
FIGURE 38. LINE REGULATION OVER-TEMPERATURE
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-25) (REXT = 100k) (Continued)
: 3.80V @: 8.72V CH2 PK-PK 5.83V +125C
3.00 2.95 DROPOUT VOLTAGE (V) 2.90 2.85 2.80 2.75 2.70 2.65 2.60 2.55 2.50 2.45 -11 -10 -9 -40C +25C
-8
-7
-6
-5
-4
-3
-2
-1
0
LOAD CURRENT (mA)
FIGURE 39. LOAD CURRENT vs DROPOUT
FIGURE 40. TURN-ON TIME, NO LOAD
: 3.80V @: 8.72V CH2 PK-PK 5.80V
: 1.90V @: 3.40V CH2 PK-PK 1.54V
FIGURE 41. TURN-ON TIME, 1k
FIGURE 42. LOAD TRANSIENT RESPONSE, 1nF LOAD CAPACITANCE
: 1.90V @: 3.40V
: 1.90V @: 4.44V CH2 PK-PK 2.84V
CH2 PK-PK 1.30V
FIGURE 43. LOAD TRANSIENT RESPONSE, 100nF LOAD CAPACITANCE
FIGURE 44. LINE TRANSIENT RESPONSE, 1nF LOAD
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-25) (REXT = 100k) (Continued)
3.0 2.5 2.0 1.5 1.0 0.5 0 -0.5 +125C -40C
VOUT (V)
+25C 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VENABLE (V)
FIGURE 45. LINE TRANSIENT RESPONSE,100nF
FIGURE 46. VOUT vs VENABLE
Typical Performance Curves (ISL21060-20) (REXT = 100k)
2.052 14 13 +125C UNIT 2 2.050 VOUT (V) 11 2.049 UNIT 1 UNIT 3 IIN (A) 10 9 +25C 8 2.047 7 2.046 -50 6 -40C 12 2.051
2.048
0
50 TEMPERATURE (C)
100
150
2
3
4 VIN (V)
5
6
FIGURE 47. VOUT vs TEMPERATURE, 3 UNITS
FIGURE 48. IIN vs VIN, 3 TEMPERATURES
0.7 0.6 0.5 IIN (A) 0.4 0.3 0.2 +125C
90 80 70 60 50 +125C 40 30 20 -40C +25C
IIN (A)
+25C
-40C
0.1 0
10 0 0 1 2 3 VIN (V) 4 5 6 0 1 2 3 VENABLE (V) 4 5 6
FIGURE 49. IIN vs VIN [SLEEP MODE], 3 TEMPERATURES
FIGURE 50. IIN vs VENABLE, 3 TEMPERATURES
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FN6706.4 September 30, 2009
ISL21060 Typical Performance Curves (ISL21060-20) (REXT = 100k) (Continued)
0.6 -40C CHANGE IN OUTPUT (V) 100 50 0 -50 -100 -40C -150 -200 -250 -300 -0.6 -12 -10 -8 -6 -4 -2 0 2 4 6 -350 2 3 4 VIN (V) 5 6 +125C +25C
0.4 VOLTAGE DIFF (mV)
0.2
+25C
0 +125C
-0.2
-0.4
LOAD (mA)
FIGURE 51. LOAD REGULATION
FIGURE 52. LINE REGULATION OVER-TEMPERATURE
2.8 2.7 DROPOUT VOLTAGE 2.6 2.5 2.4 +25C 2.3 2.2 -40C 2.1 2.0 -12 +125C PSRR (dB)
0 NO LOAD -10 -20 -30 -40 -50 -60 -70 -80 10 10nF
1nF
-10
-8
-6
-4
-2
0
100
1k
10k
100k
1M
LOAD CURRENT (mA)
FREQUENCY (Hz)
FIGURE 53. LOAD CURRENT vs DROPOUT
FIGURE 54. PSRR AT DIFFERENT CAPACITIVE LOADS
90 80 70 60 ZOUT () 50 40 30 20 10 0 1 10 100 1k 10k 100k 1M FREQUENCY (Hz) 10nF NO LOAD
1nF
FIGURE 55. ZOUT vs FREQUENCY
FIGURE 56. TURN-ON TIME, NO LOAD
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ISL21060 Typical Performance Curves (ISL21060-20) (REXT = 100k) (Continued)
FIGURE 57. TURN-ON TIME, 1k
FIGURE 58. LOAD TRANSIENT RESPONSE, 1nF LOAD CAPACITANCE
FIGURE 59. LOAD TRANSIENT RESPONSE, 100nF LOAD CAPACITANCE
FIGURE 60. LINE TRANSIENT RESPONSE,1nF LOAD
2.5 2.0 -40C 1.5 VOUT (V) 1.0 0.5 +125C 0.0 -0.5 +25C 0 1 2 3 VENABLE (V) 4 5 6
FIGURE 61. LINE TRANSIENT RESPONSE,100nF
FIGURE 62. VOUT vs VENABLE
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FN6706.4 September 30, 2009
ISL21060
FGA Technology
The ISL21060 voltage reference floating gate references possess very low drift and supply current. The charge stored on a floating gate cell is set precisely in manufacturing. The reference voltage output itself is a buffered version of the floating gate voltage. The resulting reference device has excellent characteristics which are unique in the industry and include very low temperature drift, high initial accuracy, and almost zero supply current. Also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). The process used for these reference devices is a floating gate CMOS process, and the amplifier circuitry uses CMOS transistors for amplifier and output drive. This circuitry provides excellent accuracy with a trade-off in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections.
Board Assembly Considerations
FGA references provide high accuracy and low temperature drift but some PC board assembly precautions are necessary. Normal Output voltage shifts of 100V to 1mV can be expected with Pb-free reflow profiles or wave solder on multi-layer FR4 PC boards. Precautions should be taken to avoid excessive heat or extended exposure to high reflow or wave solder temperatures, this may reduce device initial accuracy. Post-assembly x-ray inspection may also lead to permanent changes in device output voltage and should be minimized or avoided. If x-ray inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred. If large amounts of shift are observed, it is best to add an X-ray shield consisting of thin zinc (300m) sheeting to allow clear imaging, yet block x-ray energy that affects the FGA reference.
Special Applications Considerations
In addition to post-assembly examination, there are also other X-ray sources that may affect the FGA reference long term accuracy. Airport screening machines contain X-rays and will have a cumulative effect on the voltage reference output accuracy. Carry-on luggage screening uses low level X-rays and is not a major source of output voltage shift, although if a product is expected to pass through that type of screening over 100 times it may need to consider shielding with copper or aluminum. Checked luggage X-rays are higher intensity and can cause output voltage shift in much fewer passes, so devices expected to go through those machines should definitely consider shielding. Note that just two layers of 1/2 ounce copper planes will reduce the received dose by over 90%. The leadframe for the device which is on the bottom also provides similar shielding. If a device is expected to pass through luggage X-ray machines numerous times, it is advised to mount a 2-layer (minimum) PC board on the top, and along with a ground plane underneath will effectively shield it from from 50 to 100 passes through the machine. Since these machines vary in X-ray dose delivered, it is difficult to produce an accurate maximum pass recommendation.
Micropower Supply Current and Output Enable
The ISL21060 consumes extremely low supply current due to the proprietary FGA technology. Low noise performance is achieved using optimized biasing techniques. Supply current is typically 16A and noise is 10VP-P, benefitting precision, low noise portable applications, such as handheld meters and instruments. The ISL21060 devices have the EN pin, which is used to Enable/Disable the output of the device. When disabled, the reference circuitry itself remains biased at a highly accurate and reliable state. When enabled, the output is driven to the reference voltage in a relatively short time (about 300s). This feature allows multiple references to be connected and one of them selected. Another application is to disable any loads that draw significant current, saving power in standby or shutdown modes.
Board Mounting Considerations
For applications requiring the highest accuracy, board mounting location should be reviewed. The device uses a plastic SOIC package, which will subject the die to mild stresses when the PC board is heated and cooled and slightly changes shape. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to these die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Mounting the device in a cutout also minimizes flex. Obviously, mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy.
Noise Performance and Reduction
The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 10VP-P. The noise measurement is made with a bandpass filter made of a 1-pole high-pass filter with a corner frequency at 0.1Hz and a 2-pole low-pass filter with a corner frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in the 10kHz to 1MHz bandwidth is approximately 100VP-P with no capacitance on the output. This noise measurement is made with a 2 decade bandpass filter made of a 1-pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10x the center frequency. Load capacitance up to 1F can be added to improve transient response.
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ISL21060
Turn-On Time
The ISL21060 devices have low supply current and thus the time to bias-up internal circuitry to final values will be longer than with higher power references. Normal turn-on time is typically 300s. Circuit design must take this into account when looking at power-up delays or sequencing. multiplied by 106 to yield ppm/C. This is the "Box" method for specifying temperature coefficient.
VOUT Kelvin Sensing
The voltage output for the ISL21060 has both a force and a sense output. This enables remote kevin sensing for highly accurate voltage setting with long traces and higher current loads. The VOUTF (force) can be routed to the load with the shortest, widest trace possible. The VOUTS (sense) is routed with a narrower trace to the point of the actual load where it is connected to the VOUTF trace. The VOUTF and VOUTS traces must always be connected. If there is only a short trace to the load or even a very light load, then they can be connected at or near the ISL21060 device.
Temperature Coefficient
The limits stated for temperature coefficient (tempco) are governed by the method of measurement. The overwhelming standard for specifying the temperature drift of a reference is to measure the reference voltage at two temperatures take the total variation, (VHIGH - VLOW), and divide by the temperature extremes of measurement (THIGH - TLOW). The result is divided by the nominal reference voltage (at T = +25C) and
Typical Application Circuits
+2.7 TO 5.5V 0.1F 10F
LOGIC ENABLE
VIN EN VOUTF VOUTS
ISL21060-25 VOUT = 2.50V GND
0.001F VCC RH + EL8178 RL VOUT (BUFFERED) VOUT (UNBUFFERED)
X9119 SDA 2-WIRE BUS SCL VSS
FIGURE 63. 2.5V FULL SCALE LOW-DRIFT, 10-BIT ADJUSTABLE VOLTAGE SOURCE WITH LOW POWER DISABLE
+2.75V TO 5.5V 0.1F 10F
LOGIC ENABLE EN
VIN VOUTF VOUTS SEPARATE COPPER TRACE FOR SENSE INPUT VOUT SENSE LOAD
ISL21060-25 VOUT = 2.50V GND
FIGURE 64. KELVIN SENSED LOAD
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FN6706.4 September 30, 2009
ISL21060 SOT-23 Package Family
e1 A N 6 4
MDP0038
D
SOT-23 PACKAGE FAMILY MILLIMETERS SYMBOL A A1 SOT23-5 1.45 0.10 1.14 0.40 0.14 2.90 2.80 1.60 0.95 1.90 0.45 0.60 5 SOT23-6 1.45 0.10 1.14 0.40 0.14 2.90 2.80 1.60 0.95 1.90 0.45 0.60 6 TOLERANCE MAX 0.05 0.15 0.05 0.06 Basic Basic Basic Basic Basic 0.10 Reference Reference Rev. F 2/07 NOTES:
E1 2 3
E
A2 b c
0.20 C
0.15 C D 2X 5 e B b NX 1 2 3 2X 0.20 M C A-B D
D E E1 e e1 L L1 N
0.15 C A-B 2X C D
1
3
A2 SEATING PLANE 0.10 C NX A1
1. Plastic or metal protrusions of 0.25mm maximum per side are not included. 2. Plastic interlead protrusions of 0.25mm maximum per side are not included. 3. This dimension is measured at Datum Plane "H". 4. Dimensioning and tolerancing per ASME Y14.5M-1994. 5. Index area - Pin #1 I.D. will be located within the indicated zone (SOT23-6 only).
(L1)
H
6. SOT23-5 version has no center lead (shown as a dashed line).
A
GAUGE PLANE c L 0x +3 -0
0.25
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 20
FN6706.4 September 30, 2009

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