STLM20 Ultra-low current 2.4 V precision analog temperature sensor Features Precision analog voltage output temperature sensor 1.5 C temperature accuracy at 25 C Ultra-low quiescent supply current: 8.0 A (max) Operating voltage range: 2.4 V to 5.5 V Operating temperature range: -55 C to 130 C (grade - 7) -40 C to 85 C (grade - 9) SOT323-5 (SC70-5) 5-lead package UDFN 4-lead package SOT323-5, SC70-5 (W8) Applications Third generation (3G) cell phones Multimedia PDA devices GPS devices Portable medical instruments Voltage-controlled crystal oscillator temperature monitors RF power transistor monitor September 2009 UDFN 4-lead (DD) Doc ID 12495 Rev 12 1/18 www.st.com 1 Contents STLM20 Contents 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 Doc ID 12495 Rev 12 STLM20 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 First order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 6 Quadratic output equation (VCC = 2.7 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Quadratic output equation for operations over the full voltage range (VCC = 2.4 V to 5.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SOT323-5 - 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13 UDFN - 4-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Carrier tape dimensions for SOT323-5L and UDFN-4L packages . . . . . . . . . . . . . . . . . . . 15 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Doc ID 12495 Rev 12 3/18 List of figures STLM20 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. 4/18 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Filter network for noisy environments or capacitive loads > 300 pF . . . . . . . . . . . . . . . . . . 10 VOUT vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SOT323-5 - 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13 UDFN - 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Carrier tape for SOT323-5L and UDFN-4Lpackages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Doc ID 12495 Rev 12 STLM20 1 Description Description The STLM20 is a precision analog output temperature sensor for low current applications where maximizing battery life is important. It operates over a -55 C to 130 C (grade 7) or -40 C to 85 C (grade 9) temperature range. The power supply operating range is 2.4 V to 5.5 V. The accuracy of the STLM20 is 1.5 C, at an ambient temperature of 25 C. The temperature error increases linearly and reaches a maximum of 2.5 C at the temperature range extremes. The temperature range is affected by the power supply voltage. For the temperature grade 7 device, a power supply voltage of 2.7 V to 5.5 V, the temperature range extremes are +130 C and -55 C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to -30 C, while the positive remains at +130 C. The STLM20 has a maximum quiescent supply current of 8 A. Therefore, self-heating is negligible. Figure 1. Logic diagram VCC STLM20 VOUT GND(1) AI12252 1. Pin 2 GND may be grounded or left floating (SC70-5 only). For optimum thermal conductivity to the PC board ground plane, it should be grounded. Table 1. Signal names VCC Supply voltage GND Ground VOUT Output voltage NC Figure 2. No connect Connections (top view) NC(1) GND(2) 1 VOUT 3 5 GND VOUT 1 4 4 VCC NC(1) 2 3 VCC 2 AI12253 SOT323-5(SC70-5) GND AI12253_a UDFN-4Lead 1. Pin 1 NC should be left floating or grounded. 2. Pin 2 GND may be grounded or left floating. For optimum thermal conductivity to the PC board ground plane, it should be grounded. Doc ID 12495 Rev 12 5/18 Transfer function 2 STLM20 Transfer function The STLM20's transfer function can be described in different ways, with varying levels of precision. A simple linear transfer function, with good accuracy near 25 C is expressed as: Equation 1 V O = ( - 11.69mV ) C x T + 1.8663 V Over the specified operating temperature range, the best accuracy can be obtained by using the parabolic transfer function: Equation 2 V O = ( - 3.88 x 10 -6 2 x T ) + ( - 1.15 x 10 -2 x T ) + 1.8639 and solving for T: Equation 3 6 ( 1.8639 - V O ) T = - 1481.96 + 2.1962 x 10 + ----------------------------------6 3.88 x 10 The best fit linear transfer function for many popular temperature ranges was calculated in Table 2, where the error introduced by the linear transfer function increases with wider temperature ranges. Table 2. First order equations optimized for different temperature ranges Temperature range 6/18 Tmin (C) Tmax (C) VO = Maximum deviation of linear equation from parabolic equation (C) -55 130 -11.79 mV/C * T + 1.8528 V 1.41 -40 110 -11.77 mV/C * T + 1.8577 V 0.93 -30 100 -11.77 mV/C * T + 1.8605 V 0.70 -40 85 -11.67 mV/C * T + 1.8583 V 0.65 -10 65 -11.71 mV/C * T + 1.8641 V 0.23 35 45 -11.81 mV/C * T + 1.8701 V 0.004 20 30 -11.69 mV/C * T + 1.8663 V 0.004 Linear equation Doc ID 12495 Rev 12 STLM20 Transfer function Table 3. Quadratic output equation (VCC = 2.7 V) Parameter Conditions Min Typ Max TA = -55 C 2.457 2.485 2.512 TA = -40 C 2.292 2.318 2.343 TA = -30 C 2.181 2.205 2.230 TA = -20 C Temperature error based on: -6 2 -2 VOUT = (-3.88e x T ) + (-1.15e x T) + 1.8639 TA = 0 C where T is the temperature TA = 25 C 2.069 2.092 2.116 1.842 1.864 1.886 1.556 1.574 1.592 TA = 50 C 1.255 1.279 1.303 TA = 85 C 0.833 0.859 0.884 TA = 130 C 0.272 0.303 0.335 Table 4. Unit V Quadratic output equation for operations over the full voltage range (VCC = 2.4 V to 5.5 V) Parameter(1) Conditions Min Max 2.457 2.531 2.292 2.362 TA = -30 C 2.180 2.249 TA = -20 C Temperature error based on: -6 2 -2 VOUT = (-3.88e x T ) + (-1.15e x T) + 1.8639, TA = 0 C where T is the temperature TA = 25 C 2.068 2.135 1.841 1.904 1.555 1.610 TA = 50 C 1.254 1.322 TA = 85 C 0.832 0.903 0.271 0.353 TA = -55 C(2)(3) TA = -40 TA = 130 C(2) C(3) Unit V 1. VOUT tolerance is 4% (temperature grade 9 only). 2. Valid for VCC min = 2.7 V. 3. Valid for temperature grade 7 only. Doc ID 12495 Rev 12 7/18 Maximum ratings 3 STLM20 Maximum ratings Stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 5. Absolute maximum ratings Symbol TSTG TSLD(1) Parameter Storage temperature Lead solder temperature for 10 seconds Value Unit -65 to +150 C 260 C VO Output voltage -0.3 to VCC + 0.3 V VCC Supply voltage -0.2 to 6.5 V IO Output current 10 mA Maximum junction temperature 150 C SOT323-5 (SC70-5) 331.4 C/W UDFN 160.2 C/W Grade 7 -55 to 130 C Grade 9 -40 to 85 C TJ(max) JA TA(2) Thermal resistance Ambient operating temperature 1. Reflow at peak temperature of 260 C. The time above 255 C must not exceed 30 seconds. 2. Grade 7: STLM20W87F, STLM20DD7F Grade 9: STLM20DD9F 8/18 Doc ID 12495 Rev 12 STLM20 4 DC and AC characteristics DC and AC characteristics This section summarizes the DC and AC characteristics of the device. The parameters in the DC and AC characteristics table that follows are derived from tests performed under the test conditions. Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 6. DC and AC characteristics Sym Description VCC Supply voltage VO Output voltage IQ TCVO Quiescent current TA = -30 C to 130 C TA = -55 C to 130 C or -40 C to 85 C Typ(2) Max Unit 2.4 5.5 V 2.7 5.5 V 1.8639 V TA = 25 C to 30 C 1.5 C TA = 125 C to 130 C 2.5 C TA = 80 C to 85 C 2.1 C TA = 0 C 1.9 C TA = -40 C 2.3 C TA = -55 C 2.5 C 4.8 8 A -11.77 -12.2 mV/C 2.4V VCC 5.5 V Sensor gain (temperature sensitivity or average slope), VO = -11.77 mV/C * T + 1.860 V -30 C TA 100 C Non-linearity -20 C TA 80 C 0.4 % Change of quiescent current 2.4 V VCC 5.5 V 0.7 A -11 nA/C 0.02 A Temperature coefficient of quiescent current ISD Shutdown current ZO Output impedance RegL Min TA = 0 C Temperature to voltage error(3) VO = (-3.88E-6 * T2) + (-1.15E-2 * T) + 1.8639 V IQ Test condition(1) (6) Load regulation RegI1 Line regulation RegI2 VCC 0.8 V -11.4 160 -2.5 mV 2.4 V VCC 5.0 V 3.3 mV/V 5.0 V VCC 5.5 V 11 mV 0 A IL 16 A(4)(5) 1. Valid for ambient operating temperature: TA = -55 to 130 C or TA = -40 to 85 C; VCC = 2.7 V (except where noted). 2. TJ = TA = 25 C. 3. Error accuracy is between the measured and calculated output voltage at specified conditions of voltage, current, and temperature. 4. With negative current flowing into STLM20 and positive current flowing out, can typically sink less than 1 A and source is 16 A. 5. Over the supply range of 2.4 to 5.5 V. 6. Measured at constant junction temperature, with pulse testing and low duty cycle. Output changes due to heating may be calculated by multiplying internal dissipation by thermal resistance. Doc ID 12495 Rev 12 9/18 Capacitive load 5 STLM20 Capacitive load The STLM20 will handle capacitive loads of up to 300 pF. Over the specified temperature range, the STLM20 has a maximum output impedance of 160 . In a noisy environment, it may be advisable to add some filtering to minimize noise in the output voltage. A 0.1F capacitor added between the supply voltage and ground is recommended. In an extremely noisy environment, it may be necessary to add a low-pass filter network to the output of the device. A 1 F capacitor, in addition to the output impedance of the device, and a 200 series resistor, will provide a low-pass filter that will pass the slow thermal time constant of the STLM20, while filtering the higher frequency noise. Filter network for noisy environments or capacitive loads > 300 pF 0.1F Bypass Capacitor 5 4 4 VCC GND VCC GND 5 CFILTER 3 2 1 1 RFILTER VOUT VOUT RFILTER CL CL AI12259 Table 7. 10/18 3 CFILTER 0.1F Bypass Capacitor 2 Figure 3. AI12260 Resistor/capacitor combinations for the filter network RFILTER CFILTER 200 1 F 470 0.1 F 680 0.01 F 1000 1000 pF 10 k 100 pF 100 k 10 pF Doc ID 12495 Rev 12 STLM20 Typical operating characteristics The graph shown in Figure 4 represents VOUT according to temperature. VOUT vs. temperature Figure 4. 2.50 VOUT (V) 6 Typical operating characteristics 2.00 1.50 1.00 0.50 0.00 -50 -20 10 40 70 100 130 Temperature (C) Typical (VCC = 2.7V) ai13484 Doc ID 12495 Rev 12 11/18 Package mechanical data 7 STLM20 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 12/18 Doc ID 12495 Rev 12 STLM20 Package mechanical data Figure 5. SOT323-5 - 5-lead small outline transistor package outline 7091413_E 1. Drawing is not to scale. Table 8. SOT323-5 - 5-lead small outline transistor package mechanical data mm inches Symbol Typ Min Max Typ Min Max A - 0.80 1.10 - 0.031 0.043 A1 - 0 0.10 - 0.000 0.004 A2 0.90 0.80 1.00 0.035 0.031 0.039 b - 0.15 0.30 - 0.006 0.012 c - 0.10 0.22 - 0.004 0.009 D 2.00 1.80 2.20 0.079 0.071 0.087 E 2.10 1.80 2.40 0.083 0.071 0.094 E1 1.25 1.15 1.35 0.049 0.045 0.053 e 0.65 - - 0.026 - - e1 1.30 - - 0.051 - - L 0.36 0.26 0.46 0.014 0.010 0.018 < - 0 8 - 0 8 Doc ID 12495 Rev 12 13/18 Package mechanical data Figure 6. STLM20 UDFN - 4-lead package outline 7986858 Note: Drawing is not to scale. Table 9. UDFN - 4-lead package mechanical data mm inches Symbol 14/18 Min Typ Max Min Typ Max A 0.45 0.50 0.55 0.018 0.020 0.022 A1 0 0.025 0.05 0 0.001 0.002 A3 0.119 0.127 0.177 0.0046 0.0050 0.0069 b 0.20 0.25 0.30 0.008 0.010 0.012 D 0.95 1.00 1.05 0.037 0.039 0.041 E 1.25 1.30 1.35 0.049 0.051 0.053 e 0.45 0.50 0.55 0.018 0.020 0.022 L 0.35 0.40 0.45 0.014 0.016 0.018 L1 0.45 0.50 0.55 0.018 0.020 0.022 ddd 0 0.04 0.08 0 0.0016 0.0031 Doc ID 12495 Rev 12 STLM20 Package mechanical data Figure 7. Carrier tape for SOT323-5L and UDFN-4Lpackages P0 E P2 D T A0 F TOP COVER TAPE W B0 P1 CENTER LINES OF CAVITY K0 USER DIRECTION OF FEED AM03073v1 Table 10. Package Carrier tape dimensions for SOT323-5L and UDFN-4L packages W D E P0 P2 F A0 B0 K0 P1 T Unit Bulk Qty 8.00 SOT323-5L +0.30 -0.10 1.50 +0.10/ -0.00 4.00 2.00 3.50 1.75 0.10 0.10 0.10 0.05 2.25 0.10 2.40 0.10 1.22 0.10 4.00 0.30 mm 3000 0.10 0.05 8.00 +0.30 -0.10 1.50 +0.10/ -0.00 4.00 2.00 3.50 1.75 0.10 0.10 0.10 0.05 1.25 0.10 1.55 0.10 0.65 0.05 4.00 0.250 mm 3000 0.10 0.05 UDFN-4L Doc ID 12495 Rev 12 15/18 Part numbering 8 STLM20 Part numbering Table 11. Ordering information scheme Example: STLM20 DD 9 F Device type STLM20 Package W8 = SOT323-5 (SC70-5)(1) DD= UDFN - ultra thin DFN 4-lead(2) Temperature range 7 = -55 to 130C 9 = -40 to 85C Shipping method F = ECOPACK(R) package, tape & reel 1. Available in temperature grade 7 (-55 to 130 C) only 2. Available in both temperature grade 7 (-55 to 130 C) and grade 9 (-40 to 85 C) Table 12. Marking description Part number Package Marking STLM20W8 SOT323-5 (SC70-5) M20 STLM20DD UDFN 20 For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. 16/18 Doc ID 12495 Rev 12 STLM20 9 Revision history Revision history Table 13. Document revision history Date Revision 28-Jun-2006 1 Initial release. 19-Jul-2006 2 Added Table 12: Marking description 28-Aug-2006 3 Added a footnote concerning package availability in Features on page 1 and to Table 11 and Table 12; updated package mechanical data in Table 9 05-Sep-2006 4 Amended text in the Features on page 1, Section 1: Description, Section 2: Transfer function, Table 6, and Table 11 to elucidate that two packages exist each with specific temperature ranges: SOT3235 (SC70-5) 5-lead package (-55 to 130 C) and UDFN 4-lead package (-40 to 85 C) 25-Sep-2006 5 Updated Operating Temperature Ranges (now 7 and 9); updated Table 6: DC and AC characteristics 6 Table 3: Quadratic output equation (VCC = 2.7 V) and Table 4: Quadratic output equation for operations over the full voltage range (VCC = 2.4 V to 5.5 V) added. Section 6: Typical operating characteristics added. TA added to Table 5: Absolute maximum ratings. 04-Dec-2006 7 Document status updated to full datasheet; updated text in the title of Table 4: Quadratic output equation for operations over the full voltage range (VCC = 2.4 V to 5.5 V); added footnotes regarding temperature ranges in Table 11: Ordering information scheme. 08-Feb-2007 8 Added thermal resistance in Table 5: Absolute maximum ratings. 09-May-2007 9 Modified Equation 1, 2, and 3. 26-Nov-2007 10 Updated footnote 2 in Table 5; minor text updates. 07-Nov-2008 11 Updated Figure 6: UDFN - 4-lead package outline to reflect location of pin 1 with respect to the orientation of the topside marking; updated Figure 5, Table 5, 8, 11. 10-Sep-2009 12 Updated Table 5, text in Section 7: Package mechanical data; added tape and reel specifications (Figure 7 and Table 10); reformatted document. 10-Oct-2006 Changes Doc ID 12495 Rev 12 17/18 STLM20 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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