19-1787; Rev 7; 11/11 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages The LM4040 is a precision two-terminal shunt mode, bandgap voltage reference available in fixed reverse breakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical applications, the LM4040 is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm 1.8mm), 50% smaller than comparable devices in SOT23 surfacemount packages (SOT23 versions are also available). Laser-trimmed resistors ensure precise initial accuracy. With a 100ppm/°C temperature coefficient, the device is offered in four grades of initial accuracy ranging from 0.1% to 1%. The LM4040 has a 60µA to 15mA shunt current capability with low dynamic impedance, ensuring stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. The LM4040 does not require an external stabilizing capacitor while ensuring stability with any capacitive load. Features o Ultra-Small 3-Pin SC70 Package o 0.1% (max) Initial Accuracy o 100ppm/°C (max) Temperature Coefficient Guaranteed over -40°C to +125°C Temperature Range o Wide Operating Current Range: 60µA to 15mA o Low 28µVRMS Output Noise (10Hz to 10kHz) o 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V Fixed Reverse Breakdown Voltages o No Output Capacitors Required o Tolerates Capacitive Loads Selector Guide PART TEMP RANGE OUTPUT PINVOLTAGE PACKAGE (V) The LM4040 is guaranteed over the temperature range of -40°C to +125°C. For a 1.225V output version, refer to the LM4041 data sheet. LM4040_IM3-2.1+T -40°C to +85°C 3 SOT23 2.048 LM4040_IX3-2.1+T -40°C to +85°C 3 SC70 2.048 LM4040_EM3-2.1+T -40°C to +125°C 3 SOT23 2.048 ________________________Applications LM4040_EX3-2.1+T -40°C to +125°C 3 SC70 2.048 Portable, Battery-Powered Equipment LM4040_IM3-2.5+T -40°C to +85°C 3 SOT23 2.500 Notebook Computers LM4040_IX3-2.5+T -40°C to +85°C 3 SC70 2.500 LM4040_IM3-2.5/V+T -40°C to +85°C 3 SC70 2.500 LM4040_EM3-2.5+T -40°C to +125°C 3 SOT23 LM4040_EM3-2.5/V+T -40°C to +125°C 3 SOT23 2.500 LM4040_EX3-2.5+T -40°C to +125°C 3 SC70 2.500 LM4040_IM3-3.0+T -40°C to +85°C 3 SOT23 3.000 LM4040_IX3-3.0+T -40°C to +85°C 3 SC70 3.000 LM4040_EX3-3.0+T -40°C to +125°C 3 SC70 3.000 LM4040_EX3-3.3+T -40°C to +125°C 3 SC70 3.300 LM4040_IM3-4.1+T -40°C to +85°C 3 SOT23 4.096 LM4040_IX3-4.1+T -40°C to +85°C 3 SC70 4.096 Cell Phones Industrial Process Controls Pin Configuration TOP VIEW + + 1 LM4040 3 N.C.* - 2 SC70-3/SOT23-3 *PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2. Ordering Information appears at end of data sheet. 2.500 LM4040_EM3-4.1 -40°C to +125°C 3 SOT23 4.096 LM4040_EM3-4.1/V+T -40°C to +125°C 3 SOT23 4.096 LM4040_EX3-4.1+T -40°C to +125°C 3 SC70 4.096 LM4040_IM3-5.0+T -40°C to +85°C 3 SOT23 5.000 LM4040_IX3-5.0+T -40°C to +85°C 3 SC70 5.000 LM4040_EM3-5.0+T -40°C to +125°C 3 SOT23 5.000 LM4040_EM3-5.0/V+T -40°C to +125°C 3 SOT23 5.000 LM4040_EX3-5.0+T 5.000 -40°C to +125°C 3 SC70 +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 LM4040 General Description LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ABSOLUTE MAXIMUM RATINGS Reverse Current (cathode to anode) ..................................20mA Forward Current (anode to cathode) ..................................10mA Continuous Power Dissipation (TA = +70°C) 3-Pin SC70 (derate 2.17mW/°C above +70°C) ............174mW 3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mW Operating Temperature Range LM4040_I_ _ _..................................................-40°C to +85°C LM4040_E_ _ _ ..............................................-40°C to +125°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s)..................................+300°C Soldering Temperature (reflow) .......................................+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS—2.048V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current SYMBOL VR VR IRMIN CONDITIONS MIN TYP MAX LM4040A (0.1%) 2.046 2.048 2.050 LM4040B (0.2%) 2.044 2.048 2.052 LM4040C (0.5%) 2.038 2.048 2.058 LM4040D (1.0%) 2.028 2.048 2.068 LM4040A ±2.0 ±15 LM4040B ±4.0 ±17 LM4040C ±10 ±23 LM4040D ±20 ±41 LM4040A/B/C 45 65 LM4040D 45 70 TA = +25°C ∆VR/∆T IR = 1mA LM4040A/B/C ±15 ±100 LM4040D ±15 ±150 IRMIN ≤ IR ≤ 1mA Reverse Dynamic Impedance (Note 3) Wideband Noise Reverse Breakdown Voltage Long-Term Stability 2 1mA ≤ IR ≤ 15mA ZR eN ∆VR IR = 1mA, f = 120Hz, IAC = 0.1IR mV µA ppm/°C ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change V ±20 IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) UNITS LM4040A/B/C 0.3 1.0 LM4040D 0.3 1.2 LM4040A/B/C 2.5 8.0 LM4040D 2.5 10.0 LM4040A/B 0.3 0.8 LM4040C 0.3 0.9 LM4040D 0.3 1.1 mV Ω IR = 100µA, 10Hz ≤ f ≤ 10kHz 28 µVRMS T = 1000h 120 ppm _______________________________________________________________________________________ Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages LM4040 ELECTRICAL CHARACTERISTICS—2.500V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current SYMBOL VR VR IRMIN CONDITIONS MIN TYP MAX LM4040A (0.1%) 2.4975 2.5000 2.5025 LM4040B (0.2%) 2.4950 2.5000 2.5050 LM4040C (0.5%) 2.4875 2.5000 2.5125 LM4040D (1.0%) 2.4750 2.5000 2.5250 LM4040A ±2.0 ±19 LM4040B ±4.0 ±21 LM4040C ±10 ±29 LM4040D ±20 ±49 LM4040A/B/C 45 65 LM4040D 45 70 TA = +25°C ∆VR/∆T IR = 1mA LM4040A/B/C ±15 ±100 LM4040D ±15 ±150 IRMIN ≤ IR ≤ 1mA Reverse Dynamic Impedance (Note 3) Wideband Noise 1mA ≤ IR ≤ 15mA ZR eN Reverse Breakdown Voltage Long-Term Stability ∆VR IR = 1mA, f = 120Hz, IAC = 0.1IR mV µA ppm/°C ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change V ±20 IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) UNITS LM4040A/B/C 0.3 1.0 LM4040D 0.4 1.2 LM4040A/B/C 2.5 8.0 LM4040D 2.5 10.0 LM4040A/B 0.3 0.8 LM4040C 0.3 0.9 LM4040D 0.3 1.1 mV Ω IR = 100µA, 10Hz ≤ f ≤ 10kHz 35 µVRMS T = 1000h 120 ppm _______________________________________________________________________________________ 3 LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ELECTRICAL CHARACTERISTICS—3.000V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current SYMBOL VR VR IRMIN CONDITIONS TA = +25°C MIN TYP MAX LM4040A (0.1%) 2.997 3.000 3.003 LM4040B (0.2%) 2.994 3.000 3.006 LM4040C (0.5%) 2.985 3.000 3.015 LM4040D (1.0%) 2.970 3.000 3.030 LM4040A ±3.0 ±22 LM4040B ±6.0 ±26 LM4040C ±15 ±34 LM4040D ±30 ±59 LM4040A/B/C 45 67 LM4040D 45 70 ∆VR/∆T IR = 1mA LM4040A/B/C ±15 ±100 LM4040D ±15 ±150 IRMIN ≤ IR ≤ 1mA Reverse Dynamic Impedance (Note 3) Wideband Noise Reverse Breakdown Voltage Long-Term Stability 4 1mA ≤ IR ≤ 15mA ZR eN ∆VR IR = 1mA, f = 120Hz, IAC = 0.1IR mV µA ppm/°C ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change V ±20 IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) UNITS LM4040A/B/C 0.3 1.0 LM4040D 0.3 1.2 LM4040A/B/C 2.5 8.0 LM4040D 2.5 10.0 LM4040A/B 0.3 0.8 LM4040C 0.3 0.9 LM4040D 0.3 1.1 mV Ω IR = 100µA, 10Hz ≤ f ≤ 10kHz 45 µVRMS T = 1000h 120 ppm _______________________________________________________________________________________ Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages LM4040 ELECTRICAL CHARACTERISTICS—3.300V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS LM4040A (0.1%) Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current VR VR IRMIN ∆VR/∆T Reverse Dynamic Impedance (Note 3) 3.2934 3.3000 3.3066 3.2835 3.3000 3.3165 LM4040D (1.0%) 3.2670 3.3000 3.3330 LM4040A ±3.0 ±22 LM4040B ±6.0 ±26 LM4040C ±15 ±34 LM4040D ±30 ±59 LM4040A/B/C 45 67 LM4040D 45 70 IR = 1mA IRMIN ≤ IR ≤ 1mA Wideband Noise 1mA ≤ IR ≤ 15mA ZR eN Reverse Breakdown Voltage Long-Term Stability ∆VR MAX 3.3033 LM4040C (0.5%) IR = 1mA, f = 120Hz, IAC = 0.1IR UNITS V mV µA ±20 LM4040A/B/C ±15 ±100 LM4040D ±15 ±150 ppm/°C ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change TYP 3.3000 LM4040B (0.2%) TA = +25°C IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) MIN 3.2967 LM4040A/B/C 0.3 1.0 LM4040D 0.3 1.2 LM4040A/B/C 2.5 8.0 LM4040D 2.5 10.0 LM4040A/B 0.3 0.8 LM4040C 0.3 0.9 LM4040D 0.3 1.1 mV Ω IR = 100µA, 10Hz ≤ f ≤ 10kHz 50 µVRMS T = 1000h 120 ppm _______________________________________________________________________________________ 5 LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ELECTRICAL CHARACTERISTICS—4.096V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current SYMBOL VR VR IRMIN CONDITIONS TA = +25°C MIN TYP MAX LM4040A (0.1%) 4.092 4.096 4.100 LM4040B (0.2%) 4.088 4.096 4.104 LM4040C (0.5%) 4.076 4.096 4.116 LM4040D (1.0%) 4.055 4.096 4.137 LM4040A ±4.1 ±31 LM4040B ±8.2 ±35 LM4040C ±20 ±47 LM4040D ±41 ±81 LM4040A/B/C 50 73 LM4040D 50 78 ∆VR/∆T IR = 1mA LM4040A/B/C ±20 ±100 LM4040D ±20 ±150 IRMIN ≤ IR ≤ 1mA µA ppm/°C LM4040A/B/C 0.5 1.2 LM4040D 0.5 1.5 LM4040A/B/C 3.0 10.0 LM4040D 3.0 13.0 LM4040A/B/C 0.5 1.0 LM4040D 0.5 1.3 mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 64 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability 6 1mA ≤ IR ≤ 15mA mV ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change V ±30 IR = 10mA Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) UNITS ∆VR _______________________________________________________________________________________ Ω Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages LM4040 ELECTRICAL CHARACTERISTICS—5.000V (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage Reverse Breakdown Voltage Tolerance (Note 2) Minimum Operating Current Average Reverse Voltage Temperature Coefficient (Notes 2 and 3) SYMBOL VR VR IRMIN ∆VR/∆T CONDITIONS TA = +25°C MIN TYP MAX LM4040A (0.1%) 4.995 5.000 5.005 LM4040B (0.2%) 4.990 5.000 5.010 LM4040C (0.5%) 4.975 5.000 5.025 LM4040D (1.0%) 4.950 5.000 5.050 LM4040A ±5.0 ±38 LM4040B ±10 ±43 LM4040C ±25 ±58 LM4040D ±50 ±99 LM4040A/B/C 54 80 LM4040D 54 85 IR = 10mA ±30 IR = 1mA LM4040A/B/C ±20 ±100 LM4040D ±20 ±150 IRMIN ≤ IR ≤ 1mA 1mA ≤ IR ≤ 15mA V mV µA ppm/°C ±15 IR = 100µA Reverse Breakdown Voltage Change with Operating Current Change UNITS LM4040A/B/C 0.5 1.4 LM4040D 0.5 1.8 LM4040A/B/C 3.5 12.0 LM4040D 3.5 15.0 LM4040A/B/C 0.5 1.1 LM4040D 0.5 1.5 mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 80 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability ∆VR Ω Note 1: All devices are 100% production tested at TA = +25°C and are guaranteed by design for TA = TMIN to TMAX, as specified. Note 2: The overtemperature limit for Reverse Breakdown Voltage Tolerance is defined as the room-temperature Reverse Breakdown Voltage Tolerance ±[(∆VR/∆T)(max∆T)(VR)], where ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of +25°C to TMIN or TMAX, and VR is the reverse breakdown voltage. The total overtemperature tolerance for the different grades in the temperature range where max∆T = +65°C is shown below: A grade: ±0.75% = ±0.1% ±100ppm/°C 65°C B grade: ±0.85% = ±0.2% ±100ppm/°C 65°C C grade: ±1.15% = ±0.5% ±100ppm/°C 65°C D grade: ±1.98% = ±1.0% ±150ppm/°C 65°C The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = +100°C is shown below: A grade: ±1.1% = ±0.1% ±100ppm/°C 100°C B grade: ±1.2% = ±0.2% ±100ppm/°C 100°C C grade: ±1.5% = ±0.5% ±100ppm/°C 100°C D grade: ±2.5% = ±1.0% ±150ppm/°C 100°C Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature reverse breakdown voltage tolerance of ±2.5V 0.75% = ±19mV. Note 3: Guaranteed by design. _______________________________________________________________________________________ 7 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages LM4040 Typical Operating Characteristics (IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.) REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT LM4040_I_3-3.0 3 2 LM4040_I_3-2.5 LM4040_I_3-2.1 0 0 REFERENCE VOLTAGE CHANGE (mV) -1 -2 -3 -4 -5 0 50 100 -5 -10 -15 -20 -50 -25 0 REVERSE CURRENT (µA) 25 50 75 125 100 -50 -25 0 TEMPERATURE (°C) LM4040-2.5V REVERSE VOLTAGE vs. ISHUNT TA = -40°C 3 TA = +25°C TA = +85°C 2 1 6 REVERSE VOLTAGE CHANGE (mV) LM4040-04 TA = +125°C 4 25 TA = -40°C 5 4 TA = +125°C 3 TA = +85°C 2 1 TA = +25°C 0 0 0 5 10 ISHUNT (mA) 8 15 20 0 50 75 TEMPERATURE (°C) LM4040-5.0V REVERSE VOLTAGE vs. ISHUNT 5 REVERSE VOLTAGE CHANGE (mV) 0 LM4040 toc05 REVERSE VOLTAGE (V) 4 5 LM4040 toc03 1 5 1 LM4040-5.0V TEMPERATURE DRIFT LM4040-02 LM4040_I_3-5.0 REFERENCE VOLTAGE CHANGE (mV) LM4040_I_3-4.1 LM4040-01 6 LM4040-2.5V TEMPERATURE DRIFT 5 10 15 20 ISHUNT (mA) _______________________________________________________________________________________ 100 125 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages LM4040-2.5V LOAD-TRANSIENT RESPONSE LM4040-5.0V LOAD-TRANSIENT RESPONSE LM4040-2.5V LOAD-TRANSIENT RESPONSE LM4040-08 LM4040-07 LM4040-06 VGEN VGEN VGEN 10mV/div VR AC-COUPLED 2mV/div VR AC-COUPLED VR AC-COUPLED -250µA -25µA -25µA ISHUNT = 100µA ± 25µA RL = 100kΩ, SEE FIGURE 1 LM4040-5.0V LOAD-TRANSIENT RESPONSE 10mV/div 10µs/div 40µs/div 10µs/div CH1: VGEN 2V/div CH2: VR AC-COUPLED 2mV/div ISHUNT = 100µA ± 25µA, RL = 100kΩ, SEE FIGURE 1 ISHUNT = 1mA ± 250µA RL = 10kΩ, SEE FIGURE 1 LM4040-5.0V LOAD-TRANSIENT RESPONSE LM4040-2.5V LOAD-TRANSIENT RESPONSE LM4040-09 LM4040-11 LM4040-10 +2.5mA VGEN +2.5mA VGEN VGEN +250µA -250µA -2.5mA 10mV/div 20mV/div 10µs/div 20mV/div 10µs/div 10µs/div ISHUNT = 1mA ± 250µA RL = 10kΩ, SEE FIGURE 1 VR AC-COUPLED -2.5mA VR AC-COUPLED VR AC-COUPLED +250µA +25µA +25µA ISHUNT = 10mA ± 2.5mA RL = 1kΩ, SEE FIGURE 1 ISHUNT = 10mA ± 2.5mA RL = 1kΩ, SEE FIGURE 1 ISHUNT VB LM4040 Typical Operating Characteristics (continued) (IR = 100µA, SC70 package, TA = +25°C, unless otherwise noted.) 1kΩ + - RL VR VGEN Figure 1. Load-Transient Test Circuit _______________________________________________________________________________________ 9 Typical Operating Characteristics (continued) (IR = 100µA, SC70 package, TA = +25°C, unless otherwise noted.) LM4040-2.5V STARTUP CHARACTERISTICS LM4040-5.0V STARTUP CHARACTERISTICS LM4040-2.5V OUTPUT IMPEDANCE vs. FREQUENCY LM4040-13 5V 1000 LM4040-14 LM4040-12 C1 = 1µF 0V 2V 4V 1V 100 IMPEDANCE (Ω) 0V VOUT 2V 0V 4 8 C1 = 0 1 RS = 30kΩ SEE FIGURE 2 0 IR = 150µA 10 IR = 1mA RS = 16kΩ SEE FIGURE 2 12 16 20 24 28 32 36 0 0.1 10 20 30 40 50 60 70 80 90 0.1k 1k 10k 100k RESPONSE TIME (µs) RESPONSE TIME (µs) FREQUENCY (Hz) LM4040-5.0V OUTPUT IMPEDANCE vs. FREQUENCY LM4040-2.5V NOISE vs. FREQUENCY LM4040-5.0V NOISE vs. FREQUENCY 10 NOISE (nV/√Hz) IR = 150µA IR = 1mA 1 10,000 10,000 NOISE (nV/√Hz) C1 = 0 LM4040-16 LM4040-15 100 1000 1M LM4040-17 VOUT VIN VIN 5V 0V IMPEDANCE (Ω) LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 1000 C1 = 1µF 0.1 100 0.1k 1k 10k 100k 1M 1 FREQUENCY (Hz) 10 100 1k 10k FREQUENCY (Hz) 100 1 10 100 FREQUENCY (Hz) RS VIN 1Hz RATE 50% DUTY CYCLE VR Figure 2. Startup Characteristics Test Circuit 10 ______________________________________________________________________________________ 1k 10k Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages PIN NAME FUNCTION 1 + Positive Terminal of the Shunt Reference 2 − Negative Terminal of the Shunt Reference 3 N.C. No connection. Leave this pin unconnected or connected to pin 2. Detailed Description The LM4040 shunt references use the bandgap principle to produce a stable, accurate voltage. The device behaves similarly to an ideal zener diode; a fixed voltage is maintained across its output terminals when biased with 60µA to 15mA of reverse current. The LM4040 behaves similarly to a silicon diode when biased with forward currents up 10mA. Figure 3 shows a typical operating circuit. The LM4040 is ideal for providing a stable reference from a highvoltage power supply. Applications Information The LM4040’s internal pass transistor is used to maintain a constant output voltage (VSHUNT) by sinking the necessary amount of current across a source resistor. The source resistance (RS) is determined from the load current (ILOAD) range, supply voltage (VS) variations, VSHUNT, and desired quiescent current. Choose the value of RS when VS is at a minimum and ILOAD is at a maximum. Maintain a minimum ISHUNT of 60µA at all times. The RS value should be large enough to keep ISHUNT less than 15mA for proper regulation when VS is maximum and ILOAD is at a minimum. To prevent damage to the device, ISHUNT should never exceed 20mA. Therefore, the value of RS is bounded by the following equation: [VS(MIN) - VR ] / [60µA + ILOAD(MAX)] > RS > [VS(MAX) - VR ] / [20mA + ILOAD(MIN)] Choosing a larger resistance minimizes the total power dissipation in the circuit by reducing the shunt current (PD(TOTAL) = VS ISHUNT). Provide a safety margin to incorporate the worst-case tolerance of the resistor used. Ensure that the resistor’s power rating is adequate, using the following general power equation: PDR = ISHUNT (VS(MAX) - VSHUNT) VS ISHUNT + ILOAD RS ILOAD VR ISHUNT LM4040 Figure 3. Typical Operating Circuit Temperature Performance The LM4040 typically exhibits an output voltage temperature coefficient within ±15ppm/°C. The polarity of the temperature coefficient may be different from one device to another; some may have positive coefficients, and others may have negative coefficients. High Temperature Operation The maximum junction temperature of the LM4040 is +150°C. The maximum operating temperature for the LM4040_E_ is +125°C. At a maximum load current of 15mA and a maximum output voltage of 5V, the part will dissipate 75mW of power. The power dissipation limits of the 3-pin SC70 call for a derating value of 2.17mW/°C above +70°C and thus for 75mW of power dissipation, the part will selfheat to 35.56°C above ambient temperature. If the ambient temperature is +125°C, the part operates at 159.56°C, thereby exceeding the maximum junction temperature value of +150°C. For high-temperature operation, care must be taken to ensure the combination of ambient temperature, output power dissipation and package thermal resistance does not conspire to raise the device temperature beyond that listed in the Absolute Maximum Ratings. Either reduce the output load current or the ambient temperature to keep the part within the limits. Output Capacitance The LM4040 does not require an external capacitor for frequency stability and is stable for any output capacitance. ______________________________________________________________________________________ 11 LM4040 Pin Description LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages Ordering Information LM4040AIM3-2.1+T 2.048 INITIAL ACCURACY (%) 0.1 LM4040AIX3-2.1+T 2.048 LM4040BIM3-2.1+T 2.048 LM4040BIX3-2.1+T 2.048 PART OUTPUT VOLTAGE (V) TEMPCO (ppm/°C) TEMP RANGE PIN-PACKAGE TOP MARK 100 -40°C to +85°C 3 SOT23 FZEF 0.1 100 -40°C to +85°C 3 SC70 0.2 100 -40°C to +85°C 3 SOT23 FZEG 0.2 100 -40°C to +85°C 3 SC70 ABK FZEH ABJ LM4040CIM3-2.1+T 2.048 0.5 100 -40°C to +85°C 3 SOT23 LM4040CIX3-2.1+T 2.048 0.5 100 -40°C to +85°C 3 SC70 ABL LM4040DIM3-2.1+T 2.048 1.0 150 -40°C to +85°C 3 SOT23 FZEI LM4040DIX3-2.1+T 2.048 1.0 150 -40°C to +85°C 3 SC70 ABM LM4040AEM3-2.1+T 2.048 0.1 100 -40°C to +125°C 3 SOT23 FZNG LM4040AEX3-2.1+T 2.048 0.1 100 -40°C to +125°C 3 SC70 ALF LM4040BEM3-2.1-T 2.048 0.2 100 -40°C to +125°C 3 SOT23 LM4040BEX3-2.1-T 2.048 0.2 100 -40°C to +125°C 3 SC70 FZNH ALG LM4040CEM3-2.1-T 2.048 0.5 100 -40°C to +125°C 3 SOT23 FZNI LM4040CEX3-2.1+T 2.048 0.5 100 -40°C to +125°C 3 SC70 ALH LM4040DEM3-2.1+T 2.048 1.0 150 -40°C to +125°C 3 SOT23 FZNJ LM4040DEX3-2.1+T 2.048 1.0 150 -40°C to +125°C 3 SC70 ALI LM4040AIM3-2.5+T 2.500 0.1 100 -40°C to +85°C 3 SOT23 FZEJ LM4040AIX3-2.5+T 2.500 0.1 100 -40°C to +85°C 3 SC70 ABN LM4040BIM3-2.5+T 2.500 0.2 100 -40°C to +85°C 3 SOT23 FZEK LM4040BIM3-2.5/V+T 2.500 0.2 100 -40°C to +125°C 3 SOT23 FZWL LM4040BIX3-2.5+T 2.500 0.2 100 -40°C to +85°C 3 SC70 ABO FZEL LM4040CIM3-2.5+T 2.500 0.5 100 -40°C to +85°C 3 SOT23 LM4040CIX3-2.5+T 2.500 0.5 100 -40°C to +85°C 3 SC70 LM4040DIM3-2.5+T 2.500 1.0 150 -40°C to +85°C 3 SOT23 LM4040DIX3-2.5+T 2.500 1.0 150 -40°C to +85°C 3 SC70 ABQ LM4040AEM3-2.5+T 2.500 0.1 100 -40°C to +125°C 3 SOT23 FZNK LM4040AEX3-2.5+T 2.500 0.1 100 -40°C to +125°C 3 SC70 LM4040BEM3-2.5+T 2.500 0.2 100 -40°C to +125°C 3 SOT23 LM4040BEX3-2.5+T 2.500 0.2 100 -40°C to +125°C 3 SC70 LM4040CEM3-2.5+T 2.500 0.5 100 -40°C to +125°C 3 SOT23 FZNM FZVZ ABP FZEM ALJ FZNL ALK LM4040CEM3-2.5/V+T 2.500 0.5 100 -40°C to +125°C 3 SOT23 LM4040CEX3-2.5+T 2.500 0.5 100 -40°C to +125°C 3 SC70 LM4040DEM3-2.5+T 2.500 1.0 150 -40°C to +125°C 3 SOT23 FZNN LM4040DEX3-2.5+T 2.500 1.0 150 -40°C to +125°C 3 SC70 ALM +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. 12 ______________________________________________________________________________________ ALL Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages OUTPUT VOLTAGE (V) PART INITIAL ACCURACY (%) TEMPCO (ppm/°C) TEMP RANGE PIN-PACKAGE TOP MARK FZEN LM4040AIM3-3.0+T 3.000 0.1 100 -40°C to +85°C 3 SOT23 LM4040AIX3-3.0+T 3.000 0.1 100 -40°C to +85°C 3 SC70 ABR LM4040BIM3-3.0+T 3.000 0.2 100 -40°C to +85°C 3 SOT23 FZEO LM4040BIX3-3.0+T 3.000 0.2 100 -40°C to +85°C 3 SC70 ABS LM4040CIM3-3.0+T 3.000 0.5 100 -40°C to +85°C 3 SOT23 FZEP LM4040CIX3-3.0+T 3.000 0.5 100 -40°C to +85°C 3 SC70 LM4040DIM3-3.0+T 3.000 1.0 150 -40°C to +85°C 3 SOT23 FZEQ LM4040DIX3-3.0+T 3.000 1.0 150 -40°C to +85°C 3 SC70 ABU LM4040AEM3-3.0+T 3.000 0.1 100 -40°C to +125°C 3 SOT23 LM4040AEX3-3.0+T 3.000 0.1 100 -40°C to +125°C 3 SC70 ALN LM4040BEM3-3.0+T 3.000 0.2 100 -40°C to +125°C 3 SOT23 FZNP 3 SC70 ALO ABT FZNO LM4040BEX3-3.0+T 3.000 0.2 100 -40°C to +125°C LM4040CEX3-3.0+T 3.000 0.5 100 -40°C to +125°C 3 SC70 LM4040DEM3-3.0+T 3.000 1.0 150 -40°C to +125°C 3 SOT23 FZNR LM4040DEX3-3.0+T 3.000 1.0 150 -40°C to +125°C 3 SC70 ALQ LM4040AEX3-3.3+T 3.300 0.1 100 -40°C to +125°C 3 SC70 ANY LM4040BEX3-3.3+T 3.300 0.2 100 -40°C to +125°C 3 SC70 ANZ LM4040CEX3-3.3+T 3.300 0.5 100 -40°C to +125°C 3 SC70 AOA LM4040DEX3-3.3+T 3.300 1.0 150 -40°C to +125°C 3 SC70 AOB LM4040AIM3-4.1+T 4.096 0.1 100 -40°C to +85°C 3 SOT23 FZER LM4040AIX3-4.1+T 4.096 0.1 100 -40°C to +85°C 3 SC70 ABV LM4040BIM3-4.1+T 4.096 0.2 100 -40°C to +85°C 3 SOT23 FZES LM4040BIX3-4.1+T 4.096 0.2 100 -40°C to +85°C 3 SC70 ABW FZET ALP LM4040CIM3-4.1+T 4.096 0.5 100 -40°C to +85°C 3 SOT23 LM4040CIX3-4.1+T 4.096 0.5 100 -40°C to +85°C 3 SC70 ABX LM4040DIM3-4.1+T 4.096 1.0 150 -40°C to +85°C 3 SOT23 FZEU LM4040DIX3-4.1+T 4.096 1.0 150 -40°C to +85°C 3 SC70 ABY LM4040AEM3-4.1+T 4.096 0.1 100 -40°C to +125°C 3 SOT23 FZNS LM4040AEX3-4.1+T 4.096 0.1 100 -40°C to +125°C 3 SC70 ALR FZNT LM4040BEM3-4.1+T 4.096 0.2 100 -40°C to +125°C 3 SOT23 LM4040BEX3-4.1+T 4.096 0.2 100 -40°C to +125°C 3 SC70 LM4040CEM3-4.1+T 4.096 0.5 100 -40°C to +125°C 3 SOT23 ALS FZNU +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. ______________________________________________________________________________________ 13 LM4040 Ordering Information (continued) LM4040 Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages Ordering Information (continued) OUTPUT VOLTAGE (V) INITIAL ACCURACY (%) TEMPCO (ppm/°C) TEMP RANGE LM4040CEX3-4.1+T 4.096 0.5 100 -40°C to +125°C 3 SC70 LM4040DEM3-4.1+T 4.096 1.0 150 -40°C to +125°C 3 SOT23 FZNV LM4040DEM3-4.1/V+T 4.096 1.0 150 -40°C to +125°C 3 SOT23 FZWA LM4040DEX3-4.1+T 4.096 1.0 150 -40°C to +125°C 3 SC70 ALU LM4040AIM3-5.0+T 5.000 0.1 100 -40°C to +85°C 3 SOT23 FZEV LM4040AIX3-5.0+T 5.000 0.1 100 -40°C to +85°C 3 SC70 ABZ PART PIN-PACKAGE TOP MARK ALT LM4040BIM3-5.0+T 5.000 0.2 100 -40°C to +85°C 3 SOT23 LM4040BIX3-5.0+T 5.000 0.2 100 -40°C to +85°C 3 SC70 ACA LM4040CIM3-5.0+T 5.000 0.5 100 -40°C to +85°C 3 SOT23 FZEX LM4040CIX3-5.0+T 5.000 0.5 100 -40°C to +85°C 3 SC70 ACB LM4040DIM3-5.0+T 5.000 1.0 150 -40°C to +85°C 3 SOT23 FZEY LM4040DIX3-5.0+T 5.000 1.0 150 -40°C to +85°C 3 SC70 ACC LM4040AEM3-5.0+T 5.000 0.1 100 -40°C to +125°C 3 SOT23 FZNW LM4040AEM3-5.0/V+T 5.000 0.1 100 -40°C to +125°C 3 SOT23 FZWB LM4040AEX3-5.0+T 5.000 0.1 100 -40°C to +125°C 3 SC70 LM4040BEM3-5.0+T 5.000 0.2 100 -40°C to +125°C 3 SOT23 LM4040BEX3-5.0+T 5.000 0.2 100 -40°C to +125°C 3 SC70 ALW LM4040CEM3-5.0+T 5.000 0.5 100 -40°C to +125°C 3 SOT23 FZNY +FZWC LM4040CEM3-5.0/V+T 5.000 0.5 100 -40°C to +125°C 3 SOT23 LM4040CEX3-5.0+T 5.000 0.5 100 -40°C to +125°C 3 SC70 LM4040DEM3-5.0+T 5.000 1.0 150 -40°C to +125°C 3 SOT23 LM4040DEX3-5.0+T 5.000 1.0 +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. 150 -40°C to +125°C 3 SC70 14 ALV FZNX ALX FZNZ ALY Package Information Chip Information PROCESS: BiCMOS FZEW For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 3 SOT23 U3+1 21-0051 90-0179 3 SC70 X3+2 21-0075 90-0208 ______________________________________________________________________________________ Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages REVISION NUMBER REVISION DATE 0 8/00 Initial release 5 7/05 Updated Electrical Characteristics. 6 4/11 Updated Selector Guide, Absolute Maximum Ratings, and Ordering Information. 1, 2, 12, 13, 14 7 11/11 Add /V+ automotive-qualified identification to the Selector Guide and Ordering Information. 1, 12 DESCRIPTION PAGES CHANGED — 2–7 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 15 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. LM4040 Revision History