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 60µA 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 ANODE Features • • • • • • • • • Small packages: No output capacitor required Output voltage tolerance LM4041C LM4041D Low output noise (10Hz to 10kHz) Wide operating current range Extended temperature range Low temperature coefficient SOT23, SC70-5 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 ±0.5% at 25°C ±1% at 25°C 20µVrms LM4041_ADJH5 60µA to 12mA -40°C to +125°C 100ppm/°C (max) 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. 7 - 2 1 of 7 www.diodes.com December 2010 © 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 θJA SOT23 SC70-5 380°C/W 420°C/W PDIS TA = 25°C, TJ = 150°C 330mW 300mW Recommended Operating Conditions Parameter Reverse Current Output Voltage Range Operating Ambient Temperature Range LM4041 Document number: DS32020 Rev. 7 - 2 Min 0.06 1.24 -40 2 of 7 www.diodes.com Max 12 10 125 Units mA V °C December 2010 © Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Electrical Characteristics LM4041-1.2 Electrical characteristics over recommended operating conditions, TA = 25°C, unless otherwise stated, IRMIN <IR<12mA, VREF<VOUT<10V. LM4041C and LM4041D have initial tolerances of 0.5% and 1% respectively. Conditions LM4041C LM4041D Symbol Parameter Typ Units Limits Limits TA Reverse Breakdown Voltage 25°C 1.225 V 25°C ±6 ±12 VREF IR = 100 µA Reverse Breakdown Voltage mV -40 to 85°C ±14 ±24 Tolerance -40 to 125°C ±18.4 ±31 25°C 45 60 65 IRMIN Minimum Operating Current -40 to 85°C 65 70 µA -40 to 125°C 68 73 ±20 IR = 10 mA Average Reverse Breakdown -40 to 125°C ppm/°C IR = 1 mA, ±15 ±100 ±150 ΔVR/ΔΤ Voltage Temperature Coefficient IR = 100 µA ±15 25°C 0.7 1.5 2.0 IRMIN < IR < 1mA -40 to 85°C 2.0 2.5 -40 to 125°C 2.0 2.5 Reverse Breakdown Change mV ΔVR/ΔΙR With Current 25°C 2.5 6.0 8.0 1mA < IR < 12 mA -40 to 85°C 8.0 10.0 -40 to 125°C 8.0 10.0 IR = 1mA, f = 120Hz 0.5 1.5 2.0 ZR Dynamic Output Impedance Ω IAC = 0.1IR en Noise Voltage IR = 100µA 10Hz < f < 10kHz 20 µVRMS Long Term Stability (Non 120 ppm t = 1000Hrs IR = 100µA ΔVR cumulative) LM4041-Adj Electrical characteristics over recommended operating conditions, TA = 25°C, 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. Conditions Symbol Parameter Typ LM4041D Limits Units TA 25°C 1.233 V Reverse Breakdown Voltage 25°C ±12 IR = 100 µA, VREF Reverse Breakdown Voltage VKA = 5V mV -40 to 85°C ±24 Tolerance -40 to 125°C ±30 25°C 45 65 IRMIN Minimum Operating Current -40 to 85°C 70 µA -40 to 125°C 73 IR = 10 mA ±20 Average Reverse Breakdown -40 to 125°C ppm/°C IR = 1 mA, ±15 ±150 ΔVR/ΔΤ Voltage Temperature Coefficient IR = 100 µA ±15 25°C -1.55 -2.5 Reference voltage change with -40 to 85°C -3.0 mV/V IR = 1mA ΔVR/ΔVK cathode voltage change -40 to 125°C -4.0 25°C 60 150 IREF Reference input current -40 to 85°C 200 nA -40 to 125°C 200 25°C 0.7 2.0 IRMIN < IR < 1mA -40 to 85°C 2.5 VOUT > 1.6V -40 to 125°C 2.5 Reverse Breakdown Change mV ΔVR/ΔΙR With Current 25°C 2 6.0 1mA < IR < 12 mA -40 to 85°C 8.0 VOUT > 1.6V -40 to 125°C 10.0 IR = 1mA, 0.5 VKA = VREF Ω f = 120Hz ZR Dynamic Output Impedance VKA = 10V 2 IAC = 0.1IR en Noise Voltage IR = 100µA 10Hz < f < 10kHz 20 µVRMS Long Term Stability t = 1000Hrs IR = 100µA 120 ppm ΔVR (Non cumulative) LM4041 Document number: DS32020 Rev. 7 - 2 3 of 7 www.diodes.com December 2010 © Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Typical Characteristics LM4041 1.225 100 Reference Impedance (Ω) 150uA, no cap 150uA, 1uF 10 1mA, no cap 1mA, 1µF tant 1 0.1 0.01 0.1 1 10 Frequency (kHz) 100 1000 Output Impedance vs. Frequency LM4041 Document number: DS32020 Rev. 7 - 2 4 of 7 www.diodes.com December 2010 © 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 IR + IL RS 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. 7 - 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 × ⎜⎜ 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 December 2010 © Diodes Incorporated LM4041 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCES Ordering Information 25°C Tol Voltage (V) 0.5% 1.225 1.225 1% Adj ORDER CODE PACK LM4041CFTA LM4041CH5TA LM4041DFTA LM4041DH5TA LM4041DADJFTA LM4041DADJH5TA SOT23 SC70-5 SOT23 SC70-5 SOT23 SC70-5 PART MARK R1C R1C R1D R1D RAD RAD STATUS Active Active Active Active Active Active REEL SIZE 7”, 7”, 7”, 7”, 7”, 7”, 180mm 180mm 180mm 180mm 180mm 180mm TAPE QUANTITY PER WIDTH REEL 8mm 3000 8mm 3000 8mm 3000 8mm 3000 8mm 3000 8mm 3000 Package Outline Information LM4041 Document number: DS32020 Rev. 7 - 2 6 of 7 www.diodes.com December 2010 © 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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