LM4050AEM3-5.0-T中文资料

General DescriptionThe LM4050/LM4051 are precision two-terminal, shunt-mode, 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-criti-cal 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 ver-sions 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 accu-racy ranging from 0.1% to 0.5%. The LM4050/LM4051have a 60µA to 15mA shunt-current capability with low dynamic impedance, ensuring stable reverse break-down 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.________________________ApplicationsPortable, Battery-Powered Equipment Notebook Computers Cell PhonesIndustrial Process ControlsFeatures♦50ppm/°C (max) Temperature Coefficient Guaranteed over the -40°C to +125°C Temperature Range ♦Ultra-Small 3-Pin SC70 Package ♦0.1% (max) Initial Accuracy♦Wide Operating Current Range: 60µA to 15mA ♦Low 28µV RMS Output Noise (10Hz to 10kHz)♦1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V Fixed Reverse Breakdown Voltages ♦No Output Capacitors Required ♦Tolerates Capacitive LoadsLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages________________________________________________________________Maxim Integrated Products 1Pin ConfigurationTypical Operating CircuitSelector Guide19-2563; Rev 3; 3/06Ordering Information appears at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .L M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS—1.225VStresses 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.Reverse Current (cathode to anode)..................................20mA Forward Current (anode to cathode)..................................10mA Continuous Power Dissipation (T A = +70°C)3-Pin SC70 (derate 2.17mW/°C above +70°C)............174mW 3-Pin SOT23 (derate 4.01mW/°C above +70°C)..........320mWOperating Temperature RangeLM4050/LM4051_E_ _ _................................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s)..................................+300°CLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS—2.048VL M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—2.500VLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown VoltagesELECTRICAL CHARACTERISTICS—3.000VL M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages6_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—4.096VLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages_______________________________________________________________________________________7RTOL R R where ∆V R / ∆T is the V R temperature coefficient, max ∆T is the difference from the +25°C reference point to T MIN or T MAX ,and V R 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°CNote 3:Guaranteed by design.ELECTRICAL CHARACTERISTICS—5.000VL M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages8_______________________________________________________________________________________OUTPUT VOLTAGE vs. TEMPERATURE(V OUT = 2.500V)M A X 4050 t o c 02TEMPERATURE (°C)O U T P U T V O L T A G E (V )11085603510-152.4922.4942.4962.4982.490-40135OUTPUT VOLTAGE vs. TEMPERATURE(V OUT = 5.000V)M A X 4050 t o c 03TEMPERATURE (°C)O U T P U T V O L T A G E (V )11085-151035604.9894.9914.9934.9954.9974.9995.0015.0034.987-40135Typical Operating Characteristics(I R = 100µA, SC70-3 package, T A = +25°C, unless otherwise noted.)0123456050100REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENTREVERSE CURRENT (µA)R E V E R S E V O L T A G E (V )LM4050-5.0VREVERSE VOLTAGE vs. I SHUNTI SHUNT (mA)R E V E R S E V O L T A G E C H A N G E (m V )151051234560020LM4050-2.5VREVERSE VOLTAGE vs. I SHUNTI SHUNT (mA)R E V E R S E V O L T A G E C H A N G E (m V )15105123450020LM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages_______________________________________________________________________________________9V G E NV R A C -C O U P L E D+25µA-25µA10mV/divLM4050-5.0VLOAD-TRANSIENT RESPONSE40µs/divI SHUNT = 100µA ± 25µA R L = 100k Ω, SEE FIGURE 1.V G E NV R A C -C O U P L E D+250µA-250µA10mV/divLM4050-2.5VLOAD-TRANSIENT RESPONSE10µs/divI SHUNT = 1mA ± 250µA R L = 10k Ω, SEE FIGURE 1.Typical Operating Characteristics (continued)(I R = 100µA, SC70-3 package, T A = +25°C, unless otherwise noted.)V G E NV R A C -C O U P L E D+25µA-25µA2mV/divLM4050-2.5VLOAD-TRANSIENT RESPONSELM4050 toc0610µs/divCH1: V GEN 2V/divCH2: V R AC-COUPLED 2mV/divI SHUNT = 100µA ± 25µA, R L = 100k Ω, SEE FIGURE 1.V G E NV R A C -C O U P L E D+2.5mA-2.5mA20mV/div LM4050-2.5VLOAD-TRANSIENT RESPONSE10µs/divI SHUNT = 10mA ± 2.5mA R L = 1k Ω, SEE FIGURE 1.V G E NV R A C -C O U P L E D+2.5mA-2.5mA20mV/divLM4050-5.0VLOAD-TRANSIENT RESPONSE10µs/divI SHUNT = 10mA ± 2.5mA R L = 1k Ω, SEE FIGURE 1.V G E NV R A C -C O U P L E D+250µA-250µA10mV/div LM4050-5.0VLOAD-TRANSIENT RESPONSE10µs/divI SHUNT = 1mA ± 250µA R L = 10k Ω, SEE FIGURE 1.Figure 1. Load-Transient Test CircuitL M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages10______________________________________________________________________________________V I NV O U TLM4050-5.0VSTARTUP CHARACTERISTICS405020301060708090RESPONSE TIME (µs)5V 04V 2V SEE FIGURE 2.0.1k10k 1k100k1MLM4050-2.5VOUTPUT IMPEDANCE vs. FREQUENCYFREQUENCY (Hz)I M P E D A N C E (Ω)10000.1110100Typical Operating Characteristics (continued)(I R = 100µA, SC70-3 package, T A = +25°C, unless otherwise noted.)V I NV O U TLM4050-2.5VSTARTUP CHARACTERISTICS1620812424283236RESPONSE TIME (µs)5V 02V 1V R S = 30k ΩSEE FIGURE 2.1100101k10kLM4050-2.5V NOISE vs. FREQUENCYL M 4050 t o c 16FREQUENCY (Hz)10,0001001000N O I S E (n V /H z )1100101k10kLM4050-5.0V NOISE vs. FREQUENCYL M 4050 t o c 17FREQUENCY (Hz)10,0001001000N O I S E (n V /H z)0.1k10k 1k100k1MLM4050-5.0VOUTPUT IMPEDANCE vs. FREQUENCYFREQUENCY (Hz)I M P E D A N C E (Ω)1000.1110Figure 2. Startup Characteristics Test CircuitLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages______________________________________________________________________________________11Applications InformationThe LM4050/LM4051s’ internal pass transistors are used to maintain a constant output voltage (V SHUNT ) by sinking the necessary amount of current across a source resistor.The source resistance (R S ) is determined from the load current (I LOAD ) range, supply voltage (V S ) variations,V SHUNT , and desired quiescent current.Choose the value of R S when V S is at a minimum and I LOAD is at a maximum. Maintain a minimum I SHUNT of 60µA at all times. The R S value should be large enough to keep I SHUNT less than 15mA for proper regulation when V S is maximum and I LOAD is at a minimum. To prevent damage to the device, I SHUNT should never exceed 20mA.Therefore, the value of R S is bounded by the following equation:[V S(MIN)- V R ] / [60µA + I LOAD(MAX)] > R S > [V S(MAX)- V R ] / [20mA + I LOAD(MIN)]Choosing a larger resistance minimizes the total power dis-sipation in the circuit by reducing the shunt current (P D(TOTAL)= V S ✕I SHUNT ). 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:PD R = I SHUNT ✕(V S(MAX)- V SHUNT )Output CapacitanceThe LM4050/LM4051 do not require external capacitors for frequency stability and are stable for any output capacitance.Temperature PerformanceThe LM4050/LM4051 typically exhibit output voltage temperature coefficients within ±15ppm/°C. The polari-ty of the temperature coefficients may be different from one device to another; some may have positive coeffi-cients, and others may have negative coefficients.High Temperature OperationThe 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 dissi-pation 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 maxi-mum junction temperature value of +150°C. For high-temperature operation, care must be taken to ensure the combination of ambient temperature, output power dissi-pation, and package thermal resistance does not con-spire to raise the device temperature beyond that listed in the Absolute Maximum Ratings . Either reduce the out-put load current or the ambient temperature to keep the part within the limits.Figure 3. Typical Operating CircuitChip InformationTRANSISTOR COUNT: 60PROCESS: BiCMOSL M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages12______________________________________________________________________________________Ordering InformationLM4050/LM405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown Voltages______________________________________________________________________________________13Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)L M 4050/L M 405150ppm/°C Precision Micropower Shunt VoltageReferences with Multiple Reverse Breakdown VoltagesMaxim cannot assume responsibility f or 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©2006 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc.Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。