LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Description Pin Assignments The LM4041 is a bandgap circuit designed to achieve a precision micro-power voltage reference of 1.225 V. The device is available in the small outline SOT23 and SC70-5 surface mount packages which are ideal for applications where space saving is important. Both packages are available to 0.5% C grade and 1% D grade for precision applications. Excellent performance is maintained over the 60A to 12mA operating current range with a typical temperature coefficient of only 20ppm/C. The device has been designed to be highly tolerant of capacitive loads so maintaining excellent stability. This device offers a pin for pin compatible alternative to the LM4041 voltage reference in both adjustable and 1.225V output variants. LM4041_F (SOT23) CATHODE 1 3 ANODE 2 Pin 3 must left floating or connected to pin 2. LM4041_ADJF....(SOT23) REF 1 3 ANODE CATHODE 2 LM4041_H5 Features * * * * * * * * * * ANODE Small packages: SOT23, SC70-5 No output capacitor required Output voltage tolerance LM4041C: 0.5% at 25C LM4041D: 1% at 25C Low output noise: 20Vrms (10Hz to 10kHz) Wide operating current range: 60A to 12mA Extended temperature range: -40C to +125C Low temperature coefficient : 100ppm/C (max) All parts AEC-Q100 Grade1 qualified N/C 1 N/C 2 CATHODE 3 (SC70-5) 5 N/C 4 N/C Pin 2 must be left floating or connected to pin 1 LM4041_ADJH5 N/C 1 ANODE 2 CATHODE 3 (SC70-5) 5 REF 4 N/C Applications * * * * * * Battery powered equipment Precision power supplies Portable instrumentation Portable communications devices Notebook and palmtop computers Data acquisition systems LM4041 Document number: DS32020 Rev. 8 - 2 1 of 7 www.diodes.com September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Absolute Maximum Ratings Description Continuous Reverse Current (IR) Continuous Forward Current (IF) Maximum Output Voltage (LM4041_ADJ) Junction Temperature Storage Temperature ESD Ratings Human Body Model Machine Model Rating 20 10 15 -40 to 155 -55 to 150 Unit mA mA V C C 4000 200 V V These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating, for extended periods may reduce device reliability. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Package Thermal Data Package JA SOT23 SC70-5 380C/W 420C/W PDIS TA = 25C, TJ = 150C 330mW 300mW Recommended Operating Conditions Parameter Reverse Current Output Voltage Range Operating Ambient Temperature Range LM4041 Document number: DS32020 Rev. 8 - 2 Min 0.06 1.24 -40 2 of 7 www.diodes.com Max 12 10 125 Units mA V C September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Electrical Characteristics LM4041-1.2 Electrical characteristics over recommended operating conditions, TA = 25C, unless otherwise stated, IRMIN <IR<12mA, VREF<VOUT<10V. LM4041C and LM4041D have initial tolerances of 0.5% and 1% respectively. Symbol Conditions Parameter TA 25C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C Reverse Breakdown Voltage VREF Reverse Breakdown Voltage Tolerance IRMIN Minimum Operating Current VR/ IR = 100 A Average Reverse Breakdown Voltage Temperature Coefficient IR = 10 mA IR = 1 mA, IR = 100 A -40 to 125C 25C -40 to 85C -40 to 125C Reverse Breakdown Change With VR/R Current 25C 1mA < IR < 12 mA -40 to 85C -40 to 125C ZR Dynamic Output Impedance IR = 1mA, f = 120Hz, IAC = 0.1IR en Noise Voltage IR = 100A 10Hz < f < 10kHz Long Term Stability (Non t = 1000Hrs IR = 100A VR cumulative) IRMIN < IR < 1mA Typ LM4041C Limits LM4041D Limits 6 14 18.4 60 65 68 12 24 31 65 70 73 100 150 1.5 2.0 2.0 6.0 8.0 8.0 1.5 2.0 2.5 2.5 8.0 10.0 10.0 2.0 1.225 Units V 45 20 15 15 0.7 2.5 0.5 20 120 mV A ppm/C mV VRMS ppm LM4041-Adj Electrical characteristics over recommended operating conditions, TA = 25C, IRMIN <IR <12 mA, VREF <VOUT <10V unless otherwise stated. The grade D designates initial reference voltage tolerance of 1% and is measured at an output/cathode voltage of 5V. Symbol Conditions Parameter Reverse Breakdown Voltage VREF Reverse Breakdown Voltage Tolerance IRMIN Minimum Operating Current Average Reverse Breakdown VR/ Voltage Temperature Coefficient IR = 100 A, VKA = 5V IR = 10 mA IR = 1 mA, IR = 100 A VR/VK Reference voltage change with IR = 1mA cathode voltage change IREF Reference input current VR/R Reverse Breakdown Change With Current ZR Dynamic Output Impedance en Noise Voltage Long Term Stability (Non cumulative) VR LM4041 Document number: DS32020 Rev. 8 - 2 TA 25C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C -40 to 125C IRMIN < IR < 1mA VOUT > 1.6V 1mA < IR < 12 mA VOUT > 1.6V 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C 25C -40 to 85C -40 to 125C VKA = VREF IR = 1mA, f = 120Hz VKA = 10V IAC = 0.1IR IR = 100A 10Hz < f < 10kHz t = 1000Hrs IR = 100A 3 of 7 www.diodes.com Typ LM4041D Limits 1.233 45 20 15 15 -1.55 60 0.7 2 0.5 Units V 12 24 30 65 70 73 150 -2.5 -3.0 -4.0 150 200 200 2.0 2.5 2.5 6.0 8.0 10.0 mV A ppm/C mV/V nA mV 2 20 VRMS 120 ppm September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Typical Characteristics LM4041 1.225 100 Reference Impedance () 150uA, no cap 150uA, 1uF 10 1mA, no cap 1mA, 1F tant 1 0.1 0.01 0.1 1 10 Frequency (kHz) 100 1000 Output Impedance vs. Frequency LM4041 Document number: DS32020 Rev. 8 - 2 4 of 7 www.diodes.com September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Application Information In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the LM4041. VS I R + IL VS RS RS IR + IL IL IL VO IR VR VR IR Figure 2 Figure 1 RS determines the current that flows through the load (IL) and the LM4041 (IR). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IR to the LM4040 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4040 is less than 12 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the LM4040's reverse breakdown voltage, VR. RS = VS - VR IL + IR The LM4041 comes in two varients: * LM4041 with fixed 1.225V output * LM4041_ADJ with variable output voltage. LM4041 Document number: DS32020 Rev. 8 - 2 The LM4041-ADJ's output voltage can be adjusted to any value in the range of 1.24V through 10V. The output voltage is set by the ratio of two external feedback resistors as shown in Figure 2 and the internal reference voltage (VR). The output voltage is found using the equation: R VO = VR x 1 + 2 R1 Printed circuit board layout considerations LM4041 with fixed output voltage in the SOT23 package has the die attached to pin 1, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 1 of the SOT23 package must be left floating or connected to pin 2. LM4041 with fixed output voltage in the SC70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 2 must be left floating or connected to pin1. 5 of 7 www.diodes.com September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Ordering Information 25C Tol Voltage (V) 0.5% 1.225 1.225 1% Adj ORDER CODE QUALIFICATION PACK LM4041CFTA LM4041CQFTA LM4041CH5TA LM4041DFTA LM4041DQFTA LM4041DH5TA LM4041DADJFTA LM4041DADJH5TA Commercial Automotive Commercial Commercial Automotive Commercial Commercial Commercial SOT23 SOT23 SC70-5 SOT23 SOT23 SC70-5 SOT23 SC70-5 PART MARK R1C R1C R1C R1D R1D R1D RAD RAD REEL SIZE 7", 7", 7", 7", 7", 7", 7", 7", 180mm 180mm 180mm 180mm 180mm 180mm 180mm 180mm TAPE WIDTH 8mm 8mm 8mm 8mm 8mm 8mm 8mm 8mm QUANTITY PER REEL 3000 3000 3000 3000 3000 3000 3000 3000 All parts AEC-Q100 grade 1 qualified Package Outline Information LM4041 Document number: DS32020 Rev. 8 - 2 6 of 7 www.diodes.com September 2011 (c) Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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