STLM20 Ultra-low current 2.4 V precision analog temperature sensor Features ■ Precision analog voltage output temperature sensor ■ ±1.5 °C maximum temperature accuracy at 25 °C (±0.5 °C typical) ■ Ultra-low quiescent supply current: 4.8 µA (typ) and 8.0 µA (max) ■ Operating voltage range: 2.4 V to 5.5 V ■ Operating temperature range: –55 °C to 130 °C (grade 7) SOT323-5L –40 °C to 85 °C (grade 9) ■ SOT323-5L 5-lead package ■ UDFN-4L 4-lead package Applications ■ Smartphones ■ Multimedia PDA devices ■ GPS devices ■ Portable medical instruments UDFN-4L ■ Voltage-controlled crystal oscillator temperature monitors ■ RF power transistor monitor July 2010 Doc ID 12495 Rev 13 1/19 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 Doc ID 12495 Rev 13

STLM20 List of tables List of tables Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Table 2. First order equations optimized for different temperature ranges. . . . . . . . . . . . . . . . . . . . . 6 Table 3. Second order parabolic equation (V = 2.7 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CC Table 4. Second order parabolic equation for operation over the full voltage range (V = 2.4 V to 5.5 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CC Table 5. Absolute maximum ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 6. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 7. Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 8. SOT323-5L – 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . 13 Table 9. UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package mechanical data . . . . . . . . . . . . . . . . . 14 Table 10. Carrier tape dimensions for SOT323-5L and UDFN-4L packages. . . . . . . . . . . . . . . . . . . 15 Table 11. Reel dimensions for 8 mm carrier tape - SOT323-5L and UDFN-4L packages . . . . . . . . . 16 Table 12. Ordering information scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 13. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Doc ID 12495 Rev 13 3/19

List of figures STLM20 List of figures Figure 1. Logic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Connections (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Filter network for noisy environments or capacitive loads > 300 pF. . . . . . . . . . . . . . . . . . 10 Figure 4. V vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 OUT Figure 5. SOT323-5L – 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . 13 Figure 6. UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package outline. . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 7. Carrier tape for SOT323-5L and UDFN-4L packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 8. Reel schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4/19 Doc ID 12495 Rev 13

STLM20 Description 1 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 maximum temperature accuracy of the STLM20 is ±1.5 °C (±0.5 °C typ) at an ambient temperature of 25 °C and V of 2.7 V. The temperature error increases linearly CC 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 from 2.7 V to 2.4 V changes the low end of the operating temperature range from –55 °C to –30 °C, while the positive remains at +130 °C). The STLM20 has a maximum quiescent supply current of 8 µA. 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 (SOT323-5L only). For optimum thermal conductivity to the PC board ground plane, it should be grounded. T able 1. Signal names V Supply voltage CC GND Ground V Output voltage OUT NC No connect Figure 2. Connections (top view) NC(1) 1 5 GND VOUT 1 4 VCC (2) GND 2 (1) VOUT 3 4 VCC NC 2 3 GND AI12253 AI12253_a SOT323-5L UDFN-4L 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 13 5/19

Transfer function STLM20 2 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 (first order linear equation) V = (–11.69mV)⁄°C×T+1.8663V O Over the specified operating temperature range, the best accuracy can be obtained by using the parabolic transfer function: Equation 2 (second order parabolic equation) V =(–3.88 ×10−6 × T2)+(–1.15 ×10–2 × T)+1.8639 O and solving for T: ( ) 1.8639−V T=–1481.96+ 2.1962 ×106 + O 3.88×10–6 The best fit linear transfer function for many popular temperature ranges was calculated in Table2, where the error introduced by the linear transfer function increases with wider temperature ranges. T able 2. First order equations optimized for different temperature ranges Temperature range Maximum deviation of linear Linear equation equation from parabolic equation V = T (°C) T (°C) O (°C) min max –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 6/19 Doc ID 12495 Rev 13

STLM20 Transfer function T able 3. Second order parabolic equation (V = 2.7 V) CC Parameter Conditions Min Typ Max Unit T = –55 °C 2.457 2.485 2.512 A T = –40 °C 2.292 2.318 2.343 A T = –30 °C 2.181 2.205 2.230 A T = –20 °C 2.069 2.092 2.116 Temperature error based on: A V = (–3.88 x 10–6 × T2) + (–1.15 x 10–2 × T) + T = 0 °C 1.842 1.864 1.886 V OUT A 1.8639 where T is the temperature T = 25 °C 1.556 1.574 1.592 A T = 50 °C 1.255 1.279 1.303 A T = 85 °C 0.833 0.859 0.884 A T = 130 °C 0.272 0.303 0.335 A T able 4. Second order parabolic equation for operation over the full voltage range (V = 2.4 V to 5.5 V) CC Parameter(1) Conditions Min Max Unit T = –55 °C(2)(3) 2.457 2.531 A T = –40 °C(2) 2.292 2.362 A T = –30 °C 2.180 2.249 A T = –20 °C 2.068 2.135 Temperature error based on: A V = (–3.88 x 10–6 × T2) + (–1.15 x 10–2 × T) + T = 0 °C 1.841 1.904 V OUT A 1.8639, where T is the temperature T = 25 °C 1.555 1.610 A T = 50 °C 1.254 1.322 A T = 85 °C 0.832 0.903 A T = 130 °C(3) 0.271 0.353 A 1. V tolerance is ±4% (temperature grade 9 only). OUT 2. Valid for V min = 2.7 V. CC 3. Valid for temperature grade 7 only. Doc ID 12495 Rev 13 7/19

Maximum ratings STLM20 3 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. T able 5. Absolute maximum ratings Symbol Parameter Value Unit T Storage temperature –65 to +150 °C STG T (1) Lead solder temperature for 10 seconds 260 °C SLD V Output voltage –0.3 to V + 0.3 V O CC V Supply voltage –0.2 to 6.5 V CC I Output current 10 mA O T Maximum junction temperature 150 °C J(max) SOT323-5L 331.4 °C/W θ Thermal resistance JA UDFN-4L 160.2 °C/W Grade 7 –55 to 130 °C T (2) Ambient operating temperature A Grade 9 –40 to 85 °C 1. Reflow at peak temperature of 260 °C. The time above 255 °C must not exceed 30 seconds. 2. Grade 7: STLM20W87F Grade 9: STLM20DD9F 8/19 Doc ID 12495 Rev 13

STLM20 DC and AC characteristics 4 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. D C and AC characteristics Sym Description Test condition(1) Min Typ(2) Max Unit T = –30 °C to 130 °C 2.4 5.5 V A VCC Supply voltage TA = –55 °C to 130 °C or 2.7 5.5 V –40 °C to 85 °C V Output voltage T = 0 °C 1.8639 V O A T = 125 °C to 130 °C ±2.5 °C A T = 80 °C to 85 °C ±1.00 ±2.1 °C A Second order parabolic equation Temperature to voltage error(3) TA = 25 °C to 30 °C ±0.5 ±1.5 °C V = (–3.88 x 10–6 * T2) + O T = 0 °C ±0.75 ±1.9 °C A (–1.15 x 10–2 * T) + 1.8639 V T = –40 °C ±2.3 °C A T = –55 °C ±2.5 °C A I Quiescent current 2.4 V ≤ V ≤ 5.5 V 4.8 8 µA Q CC Sensor gain (temperature sensitivity or average slope), –30 °C ≤ T ≤ 100 °C –11.4 –11.77 –12.2 mV/°C A V = –11.77 mV/°C * T + 1.860 V O Non-linearity –20 °C ≤ T ≤ 80 °C ±0.4 % A ΔI Change of quiescent current 2.4 V ≤ V ≤ 5.5 V 0.7 µA Q CC Temperature coefficient of quiescent T V –11 nA/°C C O current I Shutdown current V ≤ 0.8 V 0.02 µA SD CC Z Output impedance 160 Ω O 0 µA ≤ I ≤ 16 µA(4)(5) RegL Load regulation(6) L –2.5 mV RegI1 2.4 V ≤ V ≤ 5.0 V 3.3 mV/V CC Line regulation RegI2 5.0 V ≤ V ≤ 5.5 V 11 mV CC 1. Valid for ambient operating temperature: T = –55 to 130 °C or T = –40 to 85 °C; V = 2.7 V (except where noted). A A CC 2. T = T = 25 °C, unless otherwise noted under test condition. J A 3. Accuracy is defined as the error between the measured and calculated output voltage at specified conditions of voltage, current, and temperature. 4. Positive load currents flow out of the device (sourcing) and can typically be 16 µA. For negative load currents (sinking), the device can sink less than 1 µA. 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 13 9/19

Capacitive load STLM20 5 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 Ω. In a noisy environment, it may be advisable to add some filtering to minimize noise in the output voltage. A 0.1 µF 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 µF capacitor, in addition to the output impedance of the device, and a 200 Ω 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. Figure 3. Filter network for noisy environments or capacitive loads > 300 pF 0.1µF 0.1µF Bypass Capacitor Bypass Capacitor GND VCC CFILTER GND VCC 5 4 5 4 CFILTER RFILTER 1 2 3 1 2 3 VOUT VOUT RFILTER CL CL AI12259 AI12260 T able 7. Resistor/capacitor combinations for the filter network R C FILTER FILTER 200 Ω 1 µF 470 Ω 0.1 µF 680 Ω 0.01 µF 1000 Ω 1000 pF 10 kΩ 100 pF 100 kΩ 10 pF 10/19 Doc ID 12495 Rev 13

STLM20 Typical operating characteristics 6 Typical operating characteristics The graph shown in Figure4 represents V according to temperature. OUT Figure 4. V vs. temperature OUT 2.50 2.00 ) V (T 1.50 U O 1.00 V 0.50 0.00 –50 –20 10 40 70 100 130 Temperature (°C) Typical (V = 2.7V) CC ai13484 Doc ID 12495 Rev 13 11/19

Package mechanical data STLM20 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 12/19 Doc ID 12495 Rev 13

STLM20 Package mechanical data Figure 5. SOT323-5L – 5-lead small outline transistor package outline 7091413_E 1. Drawing is not to scale. T able 8. SOT323-5L – 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 13 13/19

Package mechanical data STLM20 Figure 6. UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package outline 7986858 Note: Drawing is not to scale. Table 9. U DFN-4L – 4-lead (1.00 mm x 1.30 mm) package mechanical data mm inches Symbol 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 14/19 Doc ID 12495 Rev 13

STLM20 Package mechanical data Figure 7. Carrier tape for SOT323-5L and UDFN-4L packages P0 E D P2 T A0 F TOP COVER TAPE W B0 CENTER LINES P1 OF CAVITY K0 USER DIRECTION OF FEED AM03073v1 Table 10. Carrier tape dimensions for SOT323-5L and UDFN-4L packages Bulk Package W D E P P F A B K P T Unit 0 2 0 0 0 1 Qty 8.00 1.50 1.75 4.00 2.00 3.50 2.25 2.40 1.22 4.00 0.30 SOT323-5L +0.30 +0.10/ mm 3000 ±0.10 ±0.10 ±0.10 ±0.05 ±0.10 ±0.10 ±0.10 ±0.10 ±0.05 –0.10 –0.00 8.00 1.50 1.75 4.00 2.00 3.50 1.25 1.55 0.65 4.00 0.250 UDFN-4L +0.30 +0.10/ mm 3000 ±0.10 ±0.10 ±0.10 ±0.05 ±0.10 ±0.10 ±0.05 ±0.10 ±0.05 –0.10 –0.00 Doc ID 12495 Rev 13 15/19

Package mechanical data STLM20 Figure 8. Reel schematic T 40mm min. Access hole At slot location B D C N A G measured Tape slot In core for Full radius At hub Tape start 2.5mm min.width AM04928v1 Table 11. Reel dimensions for 8 mm carrier tape - SOT323-5L and UDFN-4L packages A B D N T C G (max) (min) (min) (min) (max) 180 mm 13 mm 8.4 mm 1.5 mm 20.2 mm 60 mm 14.4 mm (7-inch) ± 0.2 mm + 2/–0 mm Note: The dimensions given in Table11 incorporate tolerances that cover all variations on critical parameters. 16/19 Doc ID 12495 Rev 13

STLM20 Part numbering 8 Part numbering Table 12. Ordering information scheme Example: STLM20 DD 9 F Device type STLM20 Package W8 = SOT323-5L(1)(2) DD= UDFN-4L - ultra-thin DFN 4-lead(3) Temperature range 7 = –55 to 130°C 9 = –40 to 85°C Shipping method F = ECOPACK® package, tape & reel 1. Available in temperature grade 7 (–55 to 130 °C) only 2. SOT323-5L also referred to as SC70-5L 3. Available in temperature grade 9 (–40 to 85 °C) only Table 13. Marking description Part number Package Marking STLM20W87F SOT323-5L M20 STLM20DD9F UDFN-4L 20 For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. Doc ID 12495 Rev 13 17/19

Revision history STLM20 9 Revision history T able 14. Document revision history Date Revision Changes 28-Jun-2006 1 Initial release. 19-Jul-2006 2 Added Table13: Marking description Added a footnote concerning package availability in Features on 28-Aug-2006 3 page1 and to Table12 and Table13; updated package mechanical data in Table9 Amended text in the Features on page1, Section1: Description, Section2: Transfer function, Table6, and Table12 to elucidate that 05-Sep-2006 4 two packages exist each with specific temperature ranges: SOT323-5 (SC70-5) 5-lead package (–55 to 130 °C) and UDFN 4-lead package (–40 to 85 °C) Updated operating temperature ranges (now 7 and 9); updated 25-Sep-2006 5 Table6: DC and AC characteristics Table3: Second order parabolic equation (V = 2.7 V) and Table4: CC Second order parabolic equation for operation over the full voltage 10-Oct-2006 6 range (VCC = 2.4 V to 5.5 V) added. Section6: Typical operating characteristics added. T added to Table5: Absolute maximum ratings. A Document status updated to full datasheet; updated text in the title of Table4: Second order parabolic equation for operation over the full 04-Dec-2006 7 voltage range (V = 2.4 V to 5.5 V); added footnotes regarding CC temperature ranges in Table12: Ordering information scheme. 08-Feb-2007 8 Added thermal resistance in Table5: Absolute maximum ratings. 09-May-2007 9 Modified Equation 1, 2. 26-Nov-2007 10 Updated footnote 2 in Table5; minor text updates. Updated Figure6: UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package 07-Nov-2008 11 outline to reflect location of pin 1 with respect to the orientation of the topside marking; updated Figure5, Table5, 8, 12. Updated Table5, text in Section7: Package mechanical data; added 10-Sep-2009 12 tape and reel specifications (Figure7 and Table10); reformatted document. Updated Features, Section1: Description, Section2: Transfer 09-Jul-2010 13 function, Table5, 6, 12; added reel information (Figure8, Table11); removed references to SC70-5L package; minor textual changes. 18/19 Doc ID 12495 Rev 13

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