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300nA NanoPower Voltage References
ISL21080
The ISL21080 analog voltage references feature low supply voltage operation at ultra-low 310nA typ, 1.5A max operating current. Additionally, the ISL21080 family features guaranteed initial accuracy as low as 0.2% and 50ppm/C temperature coefficient. These references are ideal for general purpose portable applications to extend battery life at lower cost. The ISL21080 is provided in the industry standard 3 Ld SOT-23 pinout. The ISL21080 output voltages can be used as precision voltage sources for voltage monitors, control loops, standby voltages for low power states for DSP, FPGA, Datapath Controllers, microcontrollers and other core voltages: 0.9V, 1.024V, 1.25V, 1.5V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V and 5.0V.
ISL21080
Features
* Reference Output Voltage 0.900V, 1.024V, 1.250V, 1.500V, 2.048V, 2.500V, 3.000V, 3.300V, 4.096V, 5.000V * Initial Accuracy: ISL21080-09 and -10. . . . . . . . ISL21080-12 . . . . . . . . . . . . . ISL21080-15. . . . . . . . . . . . . . ISL21080-20 and -25. . . . . . . . ISL21080-30, -33, -41, and -50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7% 0.6% 0.5% 0.3% 0.2%
Pin Configuration
ISL21080 (3 LD SOT-23) TOP VIEW
VIN 1 3 GND VOUT 2
* Input Voltage Range: - ISL21080-09, -10, -12, -15, -20, and -25 . . . . . . . . . . . . . . . . . . - ISL21080-09 (Coming Soon) - ISL21080-30. . . . . . . . . . . . . . . - ISL21080-33. . . . . . . . . . . . . . . - ISL21080-41. . . . . . . . . . . . . . . - ISL21080-50. . . . . . . . . . . . . . .
. . . 2.7V to 5.5V . . . . 3.2V 3.5V 4.5V 5.5V to to to to 5.5V 5.5V 8.0V 8.0V
* Output Voltage Noise . . . 30VP-P (0.1Hz to 10Hz) * Supply Current. . . . . . . . . . . . . . . . 1.5A (Max) * Tempco . . . . . . . . . . . . . . . . . . . . . . . 50ppm/C * Output Current Capability . . . . . . . . . . . . . 7mA * Operating Temperature Range . . . -40C to +85C * Package . . . . . . . . . . . . . . . . . . . . .3 Ld SOT-23 * Pb-Free (RoHS compliant)
Pin Descriptions
PIN NUMBER 1 2 3 PIN NAME VIN VOUT GND DESCRIPTION Input Voltage Connection. Voltage Reference Output Ground Connection
Applications
* Energy Harvesting Applications * Wireless Sensor Network Applications * Low Power Voltage Sources for Controllers, FPGA, ASICs or Logic Devices * Battery Management/Monitoring * Low Power Standby Voltages * Portable Instrumentation * Consumer/Medical Electronics * Wearable Electronics * Lower Cost Industrial and Instrumentation * Power Regulation Circuits * Control Loops and Compensation Networks * LED/Diode Supply
October 14, 2009 FN6934.2
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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. FGA is a trademark of Intersil Corporation. Copyright Intersil Americas Inc. 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL21080
Ordering Information
PART NUMBER (Notes 1, 2) Coming Soon ISL21080DIH309Z-TK ISL21080DIH310Z-TK ISL21080DIH312Z-TK ISL21080CIH315Z-TK ISL21080CIH320Z-TK ISL21080CIH325Z-TK ISL21080CIH330Z-TK ISL21080CIH333Z-TK ISL21080CIH341Z-TK ISL21080CIH350Z-TK NOTES: 1. Please refer to TB347 for details on reel specifications. 2. 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. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL21080. For more information on MSL please see techbrief TB363. PART MARKING BCLA BCMA BCNA BCDA BCPA BCRA BCSA BCTA BCVA BCWA VOUT OPTION (V) 0.9 1.024 1.25 1.5 2.048 2.5 3.0 3.3 4.096 5.0 GRADE (%) 0.7 0.7 0.6 0.5 0.3 0.3 0.2 0.2 0.2 0.2 TEMP. RANGE (C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 PACKAGE Tape & Reel (Pb-Free) 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 3 Ld SOT-23 PKG. DWG. # P3.064 P3.064 P3.064 P3.064 P3.064 P3.064 P3.064 P3.064 P3.064 P3.064
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FN6934.2 October 14, 2009
ISL21080
Absolute Maximum Ratings
Max Voltage VIN to GND . . . . . . . . . . . . . . . . . . . . VIN to GND (ISL21080-41 and 50 only VOUT to GND (10s) . . . . . . . . . . . . . . VOUT to GND (10s) (ISL21080-41 and 50 only . . . . . . ESD Rating Human Body Model . . . . . . . . . . . . . . Machine Model . . . . . . . . . . . . . . . . . Charged Device Model . . . . . . . . . . . . . . . -0.5V to +6.5V . . . . -0.5V to +10V -0.5V to VOUT +1V . . . -0.5V to +5.1V . . . . . . . . . 5500V . . . . . . . . . . 500V . . . . . . . . . . . 2kV
Thermal Information
Thermal Resistance (Typical) JA (C/W) 3 Ld SOT-23 Package (Note 4)..................... 170 Continuous Power Dissipation (TA = +85C). . . . . . . . 99mW Storage Temperature Range . . . . . . . . . . . -65C to +150C Pb-Free Reflow Profile (Note 5) . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Temperature. . . . . . . . . . . . . . . . . . . . . . . -40C to +85C Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
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.
NOTES: 4. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 5. Post-reflow drift for the ISL21080 devices will range from 100V to 1.0mV based on experimental results with devices on FR4 double sided boards. The design engineer must take this into account when considering the reference voltage after assembly. 6. Post-assembly x-ray inspection may also lead to permanent changes in device output voltage and should be minimized or avoided. Most inspection equipment will not affect the FGA reference voltage, but if x-ray inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred.
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21080-09, VOUT = 0.9V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 0.9 -0.7 +0.7 50 2.7 0.31 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA 80 25 50 50 4 -30 30 52 1.1 100 50 5.5 1.5 350 100 350 MAX UNIT V % ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
VOUT Accuracy @ TA = +25C (Notes 5, 6) Output Voltage Temperature Coefficient (Note 7) 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% with no load f = 120Hz 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 8) Long Term Stability (Note 9)
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21080-10, VOUT = 1.024V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 1.024 -0.7 +0.7 MAX UNIT V %
VOUT Accuracy @ TA = +25C (Notes 5, 6)
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FN6934.2 October 14, 2009
ISL21080
Electrical Specifications
PARAMETER TC VOUT VIN IIN VOUT /VIN VOUT/IOUT (ISL21080-10, VOUT = 1.024V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. (Continued) DESCRIPTION Output Voltage Temperature Coefficient (Note 7) Input Voltage Range Supply Current Line Regulation Load Regulation 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA 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 8) Long Term Stability (Note 9) TA = +25C, VOUT tied to GND VOUT = 0.1% with no load f = 120Hz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C 2.7 0.31 80 25 50 50 4 -30 30 52 1.1 100 50 CONDITIONS MIN TYP MAX 50 5.5 1.5 350 100 350 UNIT ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21080-12, VOUT = 1.25V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 1.25 -0.6 +0.6 50 2.7 0.31 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA 80 25 50 50 4 -30 30 52 1.1 100 50 5.5 1.5 350 100 350 MAX UNIT V % ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
VOUT Accuracy @ TA = +25C (Notes 5, 6) Output Voltage Temperature Coefficient (Note 7) 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% with no load f = 120Hz 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 8) Long Term Stability (Note 9)
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21080-15, VOUT = 1.5V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 1.5 -0.5 +0.5 MAX UNIT V %
VOUT Accuracy @ TA = +25C (Notes 5, 6)
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FN6934.2 October 14, 2009
ISL21080
Electrical Specifications
PARAMETER TC VOUT VIN IIN VOUT /VIN VOUT/IOUT (ISL21080-15, VOUT = 1.5V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. (Continued) DESCRIPTION Output Voltage Temperature Coefficient (Note 7) Input Voltage Range Supply Current Line Regulation Load Regulation 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA 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 8) Long Term Stability (Note 9) TA = +25C, VOUT tied to GND VOUT = 0.1% with no load f = 120Hz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C 2.7 0.31 80 10 50 50 4 -30 30 52 1.1 100 50 CONDITIONS MIN TYP MAX 50 5.5 1.5 350 100 350 UNIT ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21080-20, VOUT = 2.048V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 2.048 -0.3 +0.3 50 2.7 0.31 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA 80 25 50 50 4 -30 30 52 1.1 100 50 5.5 1.5 350 100 350 MAX UNIT V % ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
VOUT Accuracy @ TA = +25C (Notes 5, 6) Output Voltage Temperature Coefficient (Note 7) 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% with no load f = 120Hz 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 8) Long Term Stability (Note 9)
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21080-25, VOUT = 2.5V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 2.5 -0.3 +0.3 MAX UNIT V %
VOUT Accuracy @ TA = +25C (Notes 5, 6)
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FN6934.2 October 14, 2009
ISL21080
Electrical Specifications
PARAMETER TC VOUT VIN IIN VOUT /VIN VOUT/IOUT (ISL21080-25, VOUT = 2.5V) VIN = 3.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. (Continued) DESCRIPTION Output Voltage Temperature Coefficient (Note 7) Input Voltage Range Supply Current Line Regulation Load Regulation 2.7 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA 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 8) Long Term Stability (Note 9) TA = +25C, VOUT tied to GND VOUT = 0.1% with no load f = 120Hz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C 2.7 0.31 80 25 50 50 4 -30 30 52 1.1 100 50 CONDITIONS MIN TYP MAX 50 5.5 1.5 350 100 350 UNIT ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21080-30, VOUT = 3.0V) VIN = 5.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 3.0 -0.2 +0.2 50 3.2 0.31 3.2 V < VIN < 5.5V Sourcing: 0mA IOUT 7mA Sinking: -7mA IOUT 0mA 80 25 50 50 4 -30 30 52 1.1 100 50 5.5 1.5 350 100 350 MAX UNIT V % ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
VOUT Accuracy @ TA = +25C (Notes 5, 6) Output Voltage Temperature Coefficient (Note 7) 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% with no load f = 120Hz 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 8) Long Term Stability (Note 9)
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21080-33, VOUT = 3.3V) VIN = 5.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 3.3 -0.2 +0.2 MAX UNIT V %
VOUT Accuracy @ TA = +25C (Note 5, 6)
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FN6934.2 October 14, 2009
ISL21080
Electrical Specifications
PARAMETER TC VOUT VIN IIN VOUT /VIN VOUT/IOUT (ISL21080-33, VOUT = 3.3V) VIN = 5.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. (Continued) DESCRIPTION Output Voltage Temperature Coefficient (Note 7) Input Voltage Range Supply Current Line Regulation Load Regulation 3.5 V < VIN < 5.5V Sourcing: 0mA IOUT 10mA Sinking: -10mA 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 8) Long Term Stability (Note 9) TA = +25C, VOUT tied to GND VOUT = 0.1% with no load f = 120Hz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C 3.5 0.31 80 25 50 50 4 -30 30 52 1.1 100 50 CONDITIONS MIN TYP MAX 50 5.5 1.5 350 100 350 UNIT ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
Electrical Specifications
PARAMETER VOUT VOA TC VOUT VIN IIN VOUT /VIN VOUT/IOUT Output Voltage
(ISL21080-41 VOUT = 4.096V) VIN = 5.0V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 4.096 -0.2 +0.2 50 4.5 0.5 4.5 V < VIN < 8.0V Sourcing: 0mA IOUT 10mA Sinking: -10mA IOUT 0mA 80 10 20 80 4 -30 30 52 1.1 100 50 8.0 1.5 350 100 350 MAX UNIT V % ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
VOUT Accuracy @ TA = +25C (Note 5, 6) Output Voltage Temperature Coefficient (Note 7) 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% with no load f = 120Hz 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 8) Long Term Stability (Note 9)
Electrical Specifications
PARAMETER VOUT VOA Output Voltage
(ISL21080-50 VOUT = 5.0V) VIN = 6.5V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP 5.0 -0.2 +0.2 MAX UNIT V %
VOUT Accuracy @ TA = +25C (Note 5, 6)
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FN6934.2 October 14, 2009
ISL21080
Electrical Specifications
PARAMETER TC VOUT VIN IIN VOUT /VIN VOUT/IOUT (ISL21080-50 VOUT = 5.0V) VIN = 6.5V, TA = -40C to +85C, IOUT = 0, unless otherwise specified. (Continued) DESCRIPTION Output Voltage Temperature Coefficient (Note 7) Input Voltage Range Supply Current Line Regulation Load Regulation 5.5 V < VIN < 8.0V Sourcing: 0mA IOUT 10mA Sinking: -10mA 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 NOTES: 7. 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 +85C = +125C. 8. 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 = +125C, the device under test is cycled from +25C to +85C to -40C to +25C. 9. Long term drift is logarithmic in nature and diminishes over time. Drift after the first 1000 hours will be approximately 10ppm/1khrs Thermal Hysteresis (Note 8) Long Term Stability (Note 9) TA = +25C, VOUT tied to GND VOUT = 0.1% with no load f = 120Hz 0.1Hz f 10Hz 10Hz f 1kHz f = 1kHz TA = +165C TA = +25C 5.5 0.5 80 10 20 80 4 -30 30 52 1.1 100 50 CONDITIONS MIN TYP MAX 50 8.0 1.5 350 100 350 UNIT ppm/C V A V/V V/mA V/mA mA ms dB VP-P VRMS V/Hz ppm ppm
Typical Performance Characteristics Curves
500 UNIT 1 400 UNIT 2 IN (nA) UNIT 3 IN (nA) 300 300 400 500
VOUT = 1.5V, VIN = 3.0V, IOUT = 0mA, TA = +25C unless otherwise specified.
+85C
-40C 200
+25C
200
100
100
0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V)
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V)
FIGURE 1. IIN vs VIN, 3 UNITS
FIGURE 2. IIN vs VIN OVER-TEMPERATURE
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FN6934.2 October 14, 2009
ISL21080
Typical Performance Characteristics Curves
VOUT (V) (NORMAILIZED TO 1.5V AT VIN = 3V) 1.50020 VOUT (V) (NORMALIZED TO VIN = 3V) 1.50015 1.50010 1.50005 1.50000 1.49995 1.49990 1.49985 1.49980 2.72.93.13.33.53.73.94.14.34.54.74.95.15.35.5 VIN (V) UNIT 3 UNIT 2 UNIT 1 150 125 100 75 50 25 0 -25 -50 -75 -100 -125 -150
VOUT = 1.5V, VIN = 3.0V, IOUT = 0mA, TA = +25C unless otherwise specified.
+25C
+85C
-40C 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V)
FIGURE 3. LINE REGULATION, 3 UNITS
FIGURE 4. LINE REGULATION OVER-TEMPERATURE
1.5005 1.5004 1.5003 1.5002 V OUT (V) 1.5001 1.5000 1.4999 1.4998 1.4997 1.4996 1.4995 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 VIN(V) UNIT 2
C L = 500pF V IN = 0.3V 50mV/DIV V IN = -0.3V
UNIT 1 UNIT 3
1ms/DIV
FIGURE 5. VOUT vs TEMPERATURE NORMALIZED to +25C
FIGURE 6. LINE TRANSIENT RESPONSE, WITH CAPACITIVE LOAD
900
C L = 0pF V IN = 0.3V
700 DVOUT (V) 500 300 100 0 -100 -300 -500
1ms/DIV
+25C
50mV/DIV
-40C +85C
V IN = -0.3V
-7 -6 -5 -4 -3 -2 -1 0
1
2
3
4
5
6
7
SINKING
OUTPUT CURRENT
SOURCING
FIGURE 7. LINE TRANSIENT RESPONSE
FIGURE 8. LOAD REGULATION OVER-TEMPERATURE
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FN6934.2 October 14, 2009
ISL21080
Typical Performance Characteristics Curves
VOUT = 1.5V, VIN = 3.0V, IOUT = 0mA, TA = +25C unless otherwise specified.
500mV/DIV
IL = 7mA
100mV/DIV
IL = 50A
IL = -7mA
IL = -50A
2ms/DIV
1ms/DIV
FIGURE 9. LOAD TRANSIENT RESPONSE
FIGURE 10. LOAD TRANSIENT RESPONSE
1.52 1.50 1.48 VOUT (V) 1.46 1.44 1.42 1.40 1.38 1.5 7mA LOAD VOLTAGE (V) NO LOAD
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 UNIT 3 UNIT 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 TIME (ms) 4.0 4.5 5.0 VIN UNIT 1
2.0
2.5
3.0
3.5 4.0 VIN (V)
4.5
5.0
5.5
FIGURE 11. DROPOUT
FIGURE 12. TURN-ON TIME
160 140 120
NO LOAD
0 NO LOAD -10 -20 PSRR (dB) 1nF -30 -40 -50 100nF 10nF 1nF
ZOUT ()
100 80 60 40 20 0 10 100 100nF 1k 10k FREQUENCY (Hz) 10nF
-60 100k 1M -70 10 100 1k 10k FREQUENCY (Hz) 100k 1M
FIGURE 13. ZOUT vs FREQUENCY
FIGURE 14. PSRR vs FREQUENCY
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FN6934.2 October 14, 2009
ISL21080
High Current Application
1.502 VIN = 5V 1.500 1.500 1.502 VIN = 5V
VREF (V)
VIN = 3.5V
VREF (V)
1.498
1.498
VIN = 3.5V
1.496 VIN = 3.3V
1.496 VIN = 3.3V 1.494
1.494
1.492
0
5
10
15
20
25
30
35
1.492
0
5
10
15
20
25
30
35
ILOAD (mA)
ILOAD (mA)
FIGURE 15. DIFFERENT VIN AT ROOM TEMPERATURE
FIGURE 16. DIFFERENT VIN AT HIGH TEMPERATURE (+85C)
Applications Information
FGA Technology
The ISL21080 series of voltage references use the floating gate technology to create references with very low drift and supply current. Essentially, 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: 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 transistor circuitry. While providing excellent accuracy, there are limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections.
devices. Application circuits using battery power will benefit greatly from having an accurate, stable reference, which essentially presents no load to the battery. In particular, battery powered data converter circuits that would normally require the entire circuit to be disabled when not in use can remain powered up between conversions as shown in Figure 17. Data acquisition circuits providing 12 bits to 24 bits of accuracy can operate with the reference device continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. Other reference devices consuming higher supply currents will need to be disabled in between conversions to conserve battery capacity. Absolute accuracy will suffer as the device is biased and requires time to settle to its final value, or, may not actually settle to a final value as power on time may be short. Table 1 shows an example of battery life in years for ISL21080 in various power on condition with 1.5A maximum current consumption.
TABLE 1. EXAMPLE OF BATTERY LIFE IN YEARS FOR ISL21080 IN VARIOUS POWER ON CONDITIONS WITH 1.5A MAX CURRENT BATTERY RATING (mAH) 40 225 50% DUTY CYCLE 6 32.6* 10% DUTY CYCLE 30* 163*
Nanopower Operation
Reference devices achieve their highest accuracy when powered up continuously, and after initial stabilization has taken place. This drift can be eliminated by leaving the power on continuously. The ISL21080 is the first high precision voltage reference with ultra low power consumption that makes it possible to leave power on continuously in battery operated circuits. The ISL21080 consumes extremely low supply current due to the proprietary FGA technology. Supply current at room temperature is typically 350nA, which is 1 to 2 orders of magnitude lower than competitive 11
CONTINUOUS 3 16.3*
NOTE: *Typical Li-ion battery has a shelf life of up to 10 years.
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ISL21080
VIN = +3.0V 10F VIN 0.01F
VOUT ISL21080 GND 0.001F TO 0.01F REF IN SERIAL BUS ENABLE SCK SDAT 12 TO 24-BIT A/D CONVERTER
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.
FIGURE 17. REFERENCE INPUT FOR ADC CONVERTER
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, however, 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, thus 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.
ISL21080 Used as a Low Cost Precision Current Source
Using an N-JET and a Nanopower voltage reference, ISL21080, a precision, low cost, high impedance current source can be created. The precision of the current source is largely dependent on the tempco and accuracy of the reference. The current setting resistor contributes less than 20% of the error.
Board Mounting Considerations
For applications requiring the highest accuracy, board mounting location should be reviewed. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to 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. Obviously, mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy.
+8V TO 28V ISET = VOUT RSET IL = ISET + IRSET
Noise Performance and Reduction
VIN 0.01F VOUT ZOUT > 100M
RSET 10k 0.1% 10ppm/C
ISL21080-1.5 VOUT = 1.5V GND
ISY ~ 0.31A ISET IL AT 0.1% ACCURACY ~150.3A
FIGURE 18. ISL21080 USED AS A LOW COST PRECISION CURRENT SOURCE
Board Assembly Considerations
FGA references provide high accuracy and low temperature drift but some PC board assembly precautions are necessary. Normal Output voltage shifts 12
The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 30VP-P. This is shown in the plot in the "Typical Performance Characteristics Curves" which begin on page 8. 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 400VP-P with no capacitance on the output, as shown in Figure 19. These noise measurements are 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 10 times the center frequency. Figure 19 also shows the noise in the 10kHz to 1MHz band can be reduced to about 50VP-P using a 0.001F capacitor on the output. Noise in the 1kHz to 100kHz band can be further reduced using a 0.1F capacitor on the output, but noise in the 1Hz to 100Hz band increases
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ISL21080
due to instability of the very low power amplifier with a 0.1F capacitance load. For load capacitances above 0.001F, the noise reduction network shown in Figure 20 is recommended. This network reduces noise significantly over the full bandwidth. As shown in Figure 19, noise is reduced to less than 40VP-P from 1Hz to 1MHz using this network with a 0.01F capacitor and a 2k resistor in series with a 10F capacitor.
400 NOISE VOLTAGE (VP-P) 350 300 250 200 150 100 50 0 1 10 100 1k 10k 100k CL = 0 CL = 0.001F CL = 0.1F CL = 0.01F AND 10F + 2k
Turn-On Time
The ISL21080 devices have ultra-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 7ms. This is shown in Figure 18. Since devices can vary in supply current down to >300nA, turn-on time can last up to about 12ms. Care should be taken in system design to include this delay before measurements or conversions are started.
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 multiplied by 106 to yield ppm/C. This is the "Box" method for specifying temperature coefficient.
FIGURE 19. NOISE REDUCTION
VIN = 3.0V 10F 0.1F VO ISL21080 GND 0.01F 10F 2k VIN
FIGURE 20. NOISE REDUCTION NETWORK
Typical Application Circuits
VIN = 3.0V R = 200 2N2905 VIN ISL21080VOUT GND 2.5V/50mA 0.001F
FIGURE 21. PRECISION 2.5V 50mA REFERENCE
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ISL21080
Typical Application Circuits (Continued)
2.7V TO 5.5V 0.1F 10F
VIN VOUT ISL21080 GND
0.001F VCC SDA SCL VSS RL RH + - VOUT (BUFFERED) VOUT
X9119 2-WIRE BUS
FIGURE 22. 2.5V FULL SCALE LOW-DRIFT 10-BIT ADJUSTABLE VOLTAGE SOURCE
2.7V TO 5.5V 0.1F 10F
VIN VOUT ISL21080 GND + - LOAD VOUT SENSE
FIGURE 23. KELVIN SENSED LOAD
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Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest Rev. DATE 10/14/09 REVISION FN6934.2 CHANGE 1. Removed "Coming Soon" on page 1 and 2 for -10, -20, -41, and -50 options. 2. Page 1. Moved "ISL21080-50 5.5V to 8.0V" from bullet to sub-bullet. 3. Update package outline drawing P3.064 to most recent revision. Updates to package were to add land pattern and move dimensions from table onto drawing (no change to package dimensions) Converted to new Intersil template. Added Revision History and Products Information. Updated Ordering Information to match Intrepid, numbered all notes and added Moisture Sensitivity Note with links. Moved Pin Descriptions to page 1 to follow pinout Changed in Features Section From: Reference Output Voltage 1.25V, 1.5V, 2.500V, 3.300V To: Reference Output Voltage 0.900V, 1.024V, 1.250V, 1.500V, 2.048V, 2.500V, 3.000V, 3.300V, 4.096V, 5.000V From: Initial Accuracy: 1.5V 0.5% To: Initial Accuracy: ISL21080-09 and -10 0.7% ISL21080-12 0.6% ISL21080-15 0.5% ISL21080-20 and -25 0.3% ISL21080-30, -33, -41, and -50 0.2% FROM: Input Voltage Range ISL21080-12 (Coming Soon) 2.7V to 5.5V ISL21080-15 2.7V to 5.5V ISL21080-25 (Coming Soon) 2.7V to 5.5V ISL21080-33 (Coming Soon) 3.5V to 5.5V TO: Input Voltage Range: ISL21080-09, -10, -12, -15, -20, and -25 2.7V to 5.5V ISL21080-09, -10, and 20 (Coming Soon) ISL21080-30 3.2V to 5.5V ISL21080-33 3.5V to 5.5V ISL21080-41 (Coming Soon) 4.5V to 8.0V Added: ISL21080-50 (Coming Soon) 5.5V to 8.0V Output Voltage Noise 30VP-P (0.1Hz to 10Hz) Updated Electrical Spec Tables by Tables with Voltage References 9, 10, 12, 20, 25, 30, 33 and 41. Added to Abs Max Ratings: VIN to GND (ISL21080-41 and 50 only -0.5V to +10V VOUT to GND (10s) (ISL21080-41 and 50 only -0.5V to +5.1V Changed Tja in Thermal information from "202.70" to "170" to match ASYD in Intrepid Added Note: Post-assembly x-ray inspection may also lead to permanent changes in device output voltage and should be minimized or avoided. Most inspection equipment will not affect the FGA reference voltage, but if x-ray inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred. Added Special Applications Considerations Section on page 12. 07/28/09 FN6934.0 Initial Release.
09/04/09
FN6934.1
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Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil product families. *For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on intersil.com: ISL21080 To report errors or suggestions for this datasheet, please go to www.intersil.com/askourstaff FITs are available from our website at http://rel.intersil.com/reports/search.php
For additional products, see www.intersil.com/product_tree Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted in the quality certifications found 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 16
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ISL21080
Package Outline Drawing
P3.064
3 LEAD SMALL OUTLINE TRANSISTOR PLASTIC PACKAGE (SOT23-3) Rev 2, 9/09
2.920.12 4 DETAIL "A"
0.130.05
C L
2.370.27 C L 1.300.10 4
0.950 0.4350.065 0.20 M C TOP VIEW 0 - 8 deg.
10 TYP (2 plcs)
0.910.03 1.000.12
0.25 GAUGE PLANE SEATING PLANE C SEATING PLANE 0.10 C
0.013(MIN) 0.100(MAX) SIDE VIEW DETAIL "A"
0.310.10 5
(0.60)
NOTES: (2.15) 1. Dimensions are in millimeters. Dimensions in ( ) for Reference Only. Dimensioning and tolerancing conform to AMSEY14.5m-1994. Reference JEDEC TO-236. Dimension does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25mm per side. Footlength is measured at reference to gauge plane.
2. (1.25) 3. 4.
5. (0.95 typ.) TYPICAL RECOMMENDED LAND PATTERN
17
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