19-2563; Rev 5; 5/11 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages The LM4050/LM4051 are precision two-terminal, shuntmode, bandgap voltage references available in fixed reverse breakdown voltages of 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical applications, the LM4050/LM4051 are offered in the subminiature 3-pin SC70 surface-mount packages (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount package (SOT23 versions are also available). Laser-trimmed resistors ensure excellent initial accuracy. With a 50ppm/°C temperature coefficient, these devices are offered in three grades of initial accuracy ranging from 0.1% to 0.5%. The LM4050/LM4051 have 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 LM4050/LM4051 do not require an external stabilizing capacitor while ensuring stability with any capacitive loads. The LM4050/LM4051 specifications are guaranteed over the temperature range of -40°C to +125°C. ________________________Applications Portable, Battery-Powered Equipment Notebook Computers Cell Phones Industrial Process Controls Typical Operating Circuit VS Features o 50ppm/°C (max) Temperature Coefficient Guaranteed over the -40°C to +125°C Temperature Range o Ultra-Small 3-Pin SC70 Package o 0.1% (max) Initial Accuracy o Wide Operating Current Range: 60µA to 15mA o Low 28µVRMS Output Noise (10Hz to 10kHz) o 1.225V, 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 PIN TEMP RANGE OUTPUT PINVOLTAGE PACKAGE (V) -40°C to +125°C 3 SOT23 LM4050_EM3-2.1+T -40°C to +125°C LM4050_EX3-2.1+T 3 SC70 -40°C to +125°C 3 SOT23 LM4050_EM3-2.5+T -40°C to +125°C LM4050_EX3-2.5+T 3 SC70 -40°C to +125°C 3 SOT23 LM4050_EM3-3.0+T -40°C to +125°C LM4050_EX3-3.0+T 3 SC70 -40°C to +125°C 3 SOT23 LM4050_EM3-3.3+T -40°C to +125°C LM4050_EX3-3.3+T 3 SC70 LM4050_EX3-3.3/V+T -40°C to +125°C 3 SC70 -40°C to +125°C 3 SOT23 LM4050_EM3-4.1+T LM4050_EM3-4.1/V+T -40°C to +125°C 3 SOT23 -40°C to +125°C LM4050_EX3-4.1+T 3 SC70 -40°C to +125°C 3 SOT23 LM4050_EM3-5.0+T LM4050_EM3-5.0/V+T -40°C to +125°C 3 SOT23 -40°C to +125°C LM4050_EX3-5.0+T 3 SC70 -40°C to +125°C 3 SOT23 LM4051_EM3-1.2+T -40°C to +125°C LM4051_EX3-1.2+T 3 SC70 +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. /V Denotes an automotive qualified part. 2.048 2.048 2.500 2.500 3.000 3.000 3.300 3.300 3.300 4.096 4.096 4.096 5.000 5.000 5.000 1.225 1.225 Ordering Information appears at end of data sheet. ISHUNT + ILOAD Pin Configuration RS ILOAD TOP VIEW VR + 1 ISHUNT LM4050/ LM4051 LM4050 3 N.C.* - 2 SC70/SOT23 *PIN 3 MUST BE LEFT UNCONNECTED OR CONNECTED TO PIN 2. ________________________________________________________________ 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 LM4050/LM4051 General Description LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References 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 LM4050/LM4051_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—1.225V (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, 3) SYMBOL VR VRTOL MIN TYP MAX LM4051A (0.1%) 1.2238 1.2250 1.2262 LM4051B (0.2%) 1.2226 1.2250 1.2275 LM4051C (0.5%) 1.2189 1.2250 1.2311 LM4051A ±1.2 ±7 LM4051B ±2.4 ±9 LM4051C ±6.0 ±12 45 60 µA IR = 10mA IR = 1mA ±20 ±15 ±50 ppm/°C IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.7 1.5 1mA ≤ IR ≤ 12mA 2.5 8.0 1.5 TA = +25°C IRMIN ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change UNITS V mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR 0.5 Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 20 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability 2 CONDITIONS ∆VR _______________________________________________________________________________________ Ω 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages (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, 3) SYMBOL VR VRTOL CONDITIONS TA = +25°C MIN TYP MAX LM4050A (0.1%) 2.0460 2.0480 2.0500 LM4050B (0.2%) 2.0439 2.0480 2.0521 LM4050C (0.5%) 2.0378 Reverse Breakdown Voltage Change with Operating Current Change V 2.0480 2.0582 LM4050A ±2.0 ±12 LM4050B ±4.0 ±14 LM4050C ±10 ±20 45 65 µA IR = 10mA IR = 1mA ±20 ±15 ±50 ppm/°C IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.3 1.0 1mA ≤ IR ≤ 15mA 2.5 8.0 LM4050A/B 0.3 0.8 LM4050C 0.3 0.9 IRMIN ∆VR/∆T UNITS mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 28 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability ∆VR Ω _______________________________________________________________________________________ 3 LM4050/LM4051 ELECTRICAL CHARACTERISTICS—2.048V LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages 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 SYMBOL VR Reverse Breakdown Voltage Tolerance (Note 2) VRTOL Minimum Operating Current IRMIN Average Reverse Voltage Temperature Coefficient (Notes 2, 3) ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change MIN TYP MAX LM4050A (0.1%) 2.4975 2.5000 2.5025 LM4050B (0.2%) 2.4950 2.5000 2.5050 LM4050C (0.5%) 2.4875 2.5000 2.5125 LM4050A ±2.5 ±15 LM4050B ±5.0 ±18 LM4050C ±13 ±25 45 65 µA ±50 ppm/°C TA = +25°C IR = 10mA ±20 IR = 1mA ±15 IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.3 1.0 1mA ≤ IR ≤ 15mA 2.5 8.0 LM4050A/B 0.3 0.8 LM4050C 0.3 0.9 UNITS V mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 35 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability 4 CONDITIONS ∆VR _______________________________________________________________________________________ Ω 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages (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, 3) SYMBOL VR VRTOL CONDITIONS MIN TYP MAX LM4050A (0.1%) 2.9970 3.0000 3.0030 LM4050B (0.2%) 2.9940 3.0000 3.0060 LM4050C (0.5%) 2.9850 3.0000 3.0150 LM4050A ±3.0 ±18 LM4050B ±6.0 ±21 LM4050C ±15 ±30 45 67 µA IR = 10mA ±20 IR = 1mA ±15 ±50 ppm/°C IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.3 1.0 1mA ≤ IR ≤ 15mA 2.5 8.0 LM4050A/B 0.3 0.8 LM4050C 0.3 0.9 TA = +25°C IRMIN ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change UNITS V mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 45 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability ∆VR Ω ELECTRICAL CHARACTERISTICS—3.300V (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, 3) SYMBOL VR VRTOL CONDITIONS MIN TYP MAX LM4050A (0.1%) 3.2967 3.3000 3.3033 LM4050B (0.2%) 3.2934 3.3000 3.3066 LM4050C (0.5%) 3.2835 3.3000 3.3165 LM4050A ±3.0 ±18 LM4050B ±6.0 ±21 LM4050C ±15 ±30 45 67 µA IR = 10mA ±20 IR = 1mA ±15 ±50 ppm/°C IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.3 1.0 1mA ≤ IR ≤ 15mA 2.5 8.0 LM4050A/B 0.3 0.8 LM4050C 0.3 0.9 TA = +25°C IRMIN ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change UNITS V mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 50 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability ∆VR Ω _______________________________________________________________________________________ 5 LM4050/LM4051 ELECTRICAL CHARACTERISTICS—3.000V LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References 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 Average Reverse Voltage Temperature Coefficient (Notes 2, 3) SYMBOL VR VRTOL MIN TYP MAX LM4050A (0.1%) 4.0919 4.0960 4.1001 LM4050B (0.2%) 4.0878 4.0960 4.1042 LM4050C (0.5%) 4.0755 4.0960 4.1165 LM4050A ±4.1 ±25 LM4050B ±8.2 ±29 LM4050C ±20 ±41 50 73 µA IR = 10mA ±30 IR = 1mA ±20 ±50 ppm/°C IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.5 1.2 1mA ≤ IR ≤ 15mA 3.0 10.0 1.0 TA = +25°C IRMIN ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change UNITS V mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR 0.5 Wideband Noise eN IR = 100µA, 10Hz ≤ f ≤ 10kHz 64 µVRMS T = 1000h 120 ppm Reverse Breakdown Voltage Long-Term Stability 6 CONDITIONS ∆VR _______________________________________________________________________________________ Ω 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages (IR = 100µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage SYMBOL VR Reverse Breakdown Voltage Tolerance (Note 2) VRTOL Minimum Operating Current IRMIN Average Reverse Voltage Temperature Coefficient (Notes 2, 3) ∆VR/∆T Reverse Breakdown Voltage Change with Operating Current Change CONDITIONS TA = +25°C MIN TYP MAX LM4050A (0.1%) 4.9950 5.0000 5.0050 LM4050B (0.2%) 4.9900 5.0000 5.0100 LM4050C (0.5%) 4.9750 UNITS V 5.0000 5.0250 LM4050A ±5.0 ±30 LM4050B ±10 ±35 LM4050C ±25 ±50 54 80 µA ±50 ppm/°C IR = 10mA ±30 IR = 1mA ±20 IR = 100µA ±15 IRMIN ≤ IR ≤ 1mA 0.5 1.4 1mA ≤ IR ≤ 15mA 3.5 12.0 1.1 mV mV Reverse Dynamic Impedance (Note 3) ZR IR = 1mA, f = 120Hz, IAC = 0.1IR 0.5 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 +25°C and are guaranteed by design for TA = TMIN to TMAX, as specified. Note 2: The limit over the full temperature range for the reverse breakdown voltage tolerance is defined as: [VRTOL] ±[(∆VR / ∆T) X (max∆T) X (VR)] where ∆VR / ∆T is the VR temperature coefficient, max∆T is the difference from the +25°C reference point to TMIN or TMAX, and VR is the reverse breakdown voltage. The total tolerance over the full temperature range for the different grades where max∆T = +100°C is shown below: • A grade: ±0.6% = ±0.1% ±50ppm/°C 100°C • B grade: ±0.7% = ±0.2% ±50ppm/°C 100°C • C grade: ±1.0% = ±0.5% ±50ppm/°C 100°C Note 3: Guaranteed by design. _______________________________________________________________________________________ 7 LM4050/LM4051 ELECTRICAL CHARACTERISTICS—5.000V Typical Operating Characteristics (IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 2.500V) OUTPUT VOLTAGE (V) 4 LM4050_I_3-3.0 3 2 2.496 5.001 2.494 2.492 LM4050_I_3-2.5 4.995 4.993 4.989 2.490 0 50 4.987 -15 -40 100 10 35 60 85 110 135 -40 -15 TEMPERATURE (°C) REVERSE CURRENT (µA) TA = -40°C TA = +25°C TA = +85°C 2 1 6 REVERSE VOLTAGE CHANGE (mV) LM4050 toc04 TA = +125°C 3 35 60 LM4050-5.0V REVERSE VOLTAGE vs. ISHUNT 5 4 10 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 85 TEMPERATURE (°C) LM4050-2.5V REVERSE VOLTAGE vs. ISHUNT REVERSE VOLTAGE CHANGE (mV) 4.997 4.991 LM4050_I_3-2.1 0 4.999 LM4050 toc05 1 MAX4050 toc02 5 5.003 OUTPUT VOLTAGE (V) LM4050_I_3-5.0 LM4050_I_3-4.1 2.498 LM4050 toc01 6 OUTPUT VOLTAGE vs. TEMPERATURE (VOUT = 5.000V) MAX4050 toc03 REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT REVERSE VOLTAGE (V) LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages 0 5 10 15 ISHUNT (mA) _______________________________________________________________________________________ 20 110 135 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages LM4050-5.0V LOAD-TRANSIENT RESPONSE LM4050-2.5V LOAD-TRANSIENT RESPONSE LM4050-2.5V LOAD-TRANSIENT RESPONSE LM4050 toc07 LM4050 toc06 LM4050 toc08 +25µA VGEN -25µA VR AC-COUPLED VR AC-COUPLED -25µA 2mV/div 10mV/div 10mV/div 10µs/div ISHUNT = 100µA ± 25µA RL = 100kΩ, SEE FIGURE 1. ISHUNT = 1mA ± 250µA RL = 10kΩ, SEE FIGURE 1. LM4050-2.5V LOAD-TRANSIENT RESPONSE LM4050-5.0V LOAD-TRANSIENT RESPONSE LM4050-5.0V LOAD-TRANSIENT RESPONSE LM4050 toc10 LM4050 toc09 LM4050 toc11 +2.5mA VGEN -2.5mA VR AC-COUPLED -250µA 10mV/div +2.5mA 20mV/div 10µs/div 10µs/div -2.5mA VR AC-COUPLED VGEN VGEN +250µA VR AC-COUPLED -250µA 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. +250µA VR AC-COUPLED VGEN VGEN +25µA 20mV/div 10µs/div ISHUNT = 10mA ± 2.5mA RL = 1kΩ, SEE FIGURE 1. ISHUNT = 10mA ± 2.5mA RL = 1kΩ, SEE FIGURE 1. ISHUNT VB 1kΩ + - RL VR VGEN Figure 1. Load-Transient Test Circuit _______________________________________________________________________________________ 9 LM4050/LM4051 Typical Operating Characteristics (continued) (IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (IR = 100µA, SC70-3 package, TA = +25°C, unless otherwise noted.) LM4050 toc13 5V 1000 5V VIN VIN C1 = 1µF 0 2V 4V 1V 0 100 IMPEDANCE (Ω) 0 VOUT VOUT LM4050-2.5V OUTPUT IMPEDANCE vs. FREQUENCY LM4050-5.0V STARTUP CHARACTERISTICS LM4050 toc12 LM4050 toc14 LM4050-2.5V STARTUP CHARACTERISTICS 2V IR = 150µA 10 C1 = 0 1 0 IR = 1mA RS = 30kΩ 4 RS = 16kΩ 8 12 16 20 24 28 32 36 0 RESPONSE TIME (µs) SEE FIGURE 2. 1k 10k 100k FREQUENCY (Hz) LM4050-2.5V NOISE vs. FREQUENCY LM4050-5.0V NOISE vs. FREQUENCY NOISE (nV/√Hz) IR = 150µA 10,000 IR = 1mA 10,000 NOISE (nV/√Hz) C1 = 0 LM4050 toc16 LM4050 toc15 100 1 0.1k RESPONSE TIME (µs) 1M SEE FIGURE 2. LM4050-5.0V OUTPUT IMPEDANCE vs. FREQUENCY 10 0.1 10 20 30 40 50 60 70 80 90 1000 LM4050 toc17 0 IMPEDANCE (Ω) LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages 1000 C1 = 1µF 100 0.1 0.1k 1k 10k 100k 1M 100 1 10 100 1k 10k FREQUENCY (Hz) FREQUENCY (Hz) 1 10 100 FREQUENCY (Hz) RS VIN 1Hz RATE 50% DUTY CYCLE VR Figure 2. Startup Characteristics Test Circuit 10 ______________________________________________________________________________________ 1k 10k 50ppm/°C Precision Micropower Shunt Voltage References 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 LM4050/LM4051 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 LM4050/LM4051 clamps to a voltage of one diode drop below ground when biased with forward currents up 10mA. Figure 3 shows a typical operating circuit. The LM4050/LM4051 are ideal for providing stable references from a high-voltage power supply. Applications Information The LM4050/LM4051s’ internal pass transistors are 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) Output Capacitance VS ISHUNT + ILOAD RS ILOAD VR ISHUNT LM4050 Figure 3. Typical Operating Circuit Temperature Performance The LM4050/LM4051 typically exhibit output voltage temperature coefficients within ±15ppm/°C. The polarity of the temperature coefficients 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 LM4050/ LM4051 is +150°C. The maximum operating temperature for the LM4050/LM4051_E_ is +125°C. At a maximum load current of 15mA and a maximum output voltage of 5V, the parts 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 parts self-heat to 35.56°C above ambient temperature. If the ambient temperature is +125°C, the parts operate at 159.56°C, thereby exceeding the maximum junction temperature value of +150°C. For hightemperature 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. The LM4050/LM4051 do not require external capacitors for frequency stability and are stable for any output capacitance. ______________________________________________________________________________________ 11 LM4050/LM4051 Pin Description LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages Ordering Information PART OUTPUT INITIAL VOLTAGE (V) ACCURACY (%) TEMPCO (ppm/_ C) TEMP RANGE PINPACKAGE TOP MARK LM4050AEM3-2.1+T 2.048 0.1 50 -40°C to +125°C 3 SOT23 FZTR LM4050AEX3-2.1+T LM4050BEM3-2.1+T 2.048 2.048 0.1 0.2 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 ASM FZTS LM4050BEX3-2.1+T 2.048 0.2 50 -40°C to +125°C 3 SC70 ASN LM4050CEM3-2.1+T 2.048 0.5 50 -40°C to +125°C 3 SOT23 FZTT LM4050CEX3-2.1+T LM4050AEM3-2.5+T 2.048 2.500 0.5 0.1 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 ASO FZTU LM4050AEX3-2.5+T 2.500 0.1 50 -40°C to +125°C 3 SC70 ASP LM4050BEM3-2.5+T 2.500 0.2 50 -40°C to +125°C 3 SOT23 FZTV LM4050BEX3-2.5+T LM4050CEM3-2.5+T 2.500 2.500 0.2 0.5 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 ASQ FZTW LM4050CEX3-2.5+T 2.500 0.5 50 -40°C to +125°C 3 SC70 ASR LM4050AEM3-3.0+T 3.000 0.1 50 -40°C to +125°C 3 SOT23 FZTX LM4050AEX3-3.0+T LM4050BEM3-3.0+T 3.000 3.000 0.1 0.2 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 ASS FZTY LM4050BEX3-3.0+T 3.000 0.2 50 -40°C to +125°C 3 SC70 AST LM4050CEM3-3.0+T 3.000 0.5 50 -40°C to +125°C 3 SOT23 FZTZ LM4050CEX3-3.0+T LM4050AEX3-3.3+T 3.000 3.300 0.5 0.1 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SC70 ASU AOJ LM4050AEX3-3.3/V+T 3.300 0.1 50 -40°C to +125°C 3 SC70 +AUE LM4050BEX3-3.3+T 3.300 0.2 50 -40°C to +125°C 3 SC70 AOK LM4050CEX3-3.3+T LM4050AEM3-4.1+T 3.300 4.096 0.5 0.1 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 AOL FZUA LM4050AEX3-4.1+T 4.096 0.1 50 -40°C to +125°C 3 SC70 LM4050BEM3-4.1+T 4.096 0.2 50 -40°C to +125°C 3 SOT23 FZUB ASV LM4050BEM3-4.1/V+T LM4050BEX3-4.1+T 4.096 4.096 0.2 0.2 50 50 -40°C to +125°C -40°C to +125°C 3 SOT23 3 SC70 +FZVL ASW LM4050CEM3-4.1+T 4.096 0.5 50 -40°C to +125°C 3 SOT23 FZUC LM4050CEX3-4.1+T 4.096 0.5 50 -40°C to +125°C 3 SC70 LM4050AEM3-5.0+T LM4050AEX3-5.0+T 5.000 5.000 0.1 0.1 50 50 -40°C to +125°C -40°C to +125°C 3 SOT23 3 SC70 FZUD ASY LM4050BEM3-5.0+T 5.000 0.2 50 -40°C to +125°C 3 SOT23 FZUE LM4050BEX3-5.0+T 5.000 0.2 50 -40°C to +125°C 3 SC70 LM4050CEM3-5.0+T LM4050CEM3-5.0/V+T 5.000 5.000 0.5 0.5 50 50 -40°C to +125°C -40°C to +125°C 3 SOT23 3 SOT23 ASX ASZ FZUF +FZVM LM4050CEX3-5.0+T 5.000 0.5 50 -40°C to +125°C 3 SC70 LM4051AEM3-1.2+T 1.225 0.1 50 -40°C to +125°C 3 SOT23 FZTO LM4051AEX3-1.2+T LM4051BEM3-1.2+T 0.1 0.2 50 50 -40°C to +125°C -40°C to +125°C 3 SC70 3 SOT23 ASJ FZTP LM4051BEX3-1.2+T 1.225 1.225 1.225 0.2 50 -40°C to +125°C 3 SC70 ASK LM4051CEM3-1.2+T 1.225 0.5 50 -40°C to +125°C 3 SOT23 FZTQ LM4051CEX3-1.2+T 1.225 0.5 50 -40°C to +125°C 3 SC70 12 ______________________________________________________________________________________ ATA ASL 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages PROCESS: BiCMOS 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 ______________________________________________________________________________________ 13 LM4050/LM4051 Package Information Chip Information LM4050/LM4051 50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages Revision History REVISION NUMBER REVISION DATE 0 7/02 Initial release 4 5/09 Added lead-free notation and corrected topmarks in the Ordering Information and Selector Guide sections 1, 12 5 5/11 Added automotive packages and updated the Absolute Maximum Ratings. 1, 2 DESCRIPTION PAGES CHANGED — 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. 14 ____________________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.