STLM20W87F

STLM20 Ultra-low current 2.4V precision analog temperature sensor Features ■ ■ ■ ■ ■ Precision analog voltage output temperature sensor ±1.5°C temperature accuracy at 25°C Ultra-low quiescent supply current: 8.0µA (max) Operating voltage range: 2.4V to 5.5V 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 UDFN 4-lead (DD) November 2007 Rev 10 1/16 www.st.com 1 Contents STLM20 Contents 1 2 3 4 5 6 7 8 9 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 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. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 First order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 6 Quadratic output equation (VCC = 2.7V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Quadratic output equation for operations over the full voltage range (VCC = 2.4V to 5.5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . 12 UDFN – 4-lead package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3/16 List of figures STLM20 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Filter network for noisy environments or capacitive loads > 300pF . . . . . . . . . . . . . . . . . . 10 VOUT vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 SOT323-5 – 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 12 UDFN – 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4/16 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 2.4V to 5.5V. 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 2.7V to 5.5V, the temperature range extremes are +130°C and –55°C. Decreasing the power supply voltage to 2.4V changes the negative extreme to –30°C, while the positive remains at +130°C. The STLM20 has a maximum quiescent supply current of 8µA. 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. VCC GND VOUT NC Signal names Supply voltage Ground Output voltage No connect Figure 2. Connections (top view) NC(1) GND(2) VOUT 1 2 3 4 VCC AI12253 5 GND VOUT NC(1) 1 4 VCC GND AI12253_a 2 3 SOT323-5(SC70-5) 1. Pin 1 NC should be left floating or grounded. UDFN-4Lead 2. Pin 2 GND may be grounded or left floating. For optimum thermal conductivity to the PC board ground plane, it should be grounded. 5/16 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 V O = ( – 11.69mV ) ⁄ ° C × 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 × 10 and solving for T: Equation 3 6 ( 1.8639 – V O ) T = – 1481.96 + 2.1962 × 10 + ---------------------------------–6 3.88 × 10 –6 × T ) + ( – 1.15 × 10 2 –2 × T ) + 1.8639 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 Linear equation VO = –11.79mV/°C * T + 1.8528V –11.77mV/°C * T + 1.8577V –11.77mV/°C * T + 1.8605V –11.67mV/°C * T + 1.8583V –11.71mV/°C * T + 1.8641V –11.81mV/°C * T + 1.8701V –11.69mV/°C * T + 1.8663V Maximum deviation of linear equation from parabolic equation (°C) ±1.41 ±0.93 ±0.70 ±0.65 ±0.23 ±0.004 ±0.004 Temperature range Tmin (°C) –55 –40 –30 –40 –10 35 20 Tmax (°C) 130 110 100 85 65 45 30 6/16 STLM20 Table 3. Quadratic output equation (VCC = 2.7V) Parameter Conditions TA = –55°C TA = –40°C TA = –30°C TA = –20°C Temperature error based on: VOUT = (–3.88e–6 × T2) + (–1.15e–2 × T) + 1.8639 TA = 0°C where T is the temperature TA = 25°C TA = 50°C TA = 85°C TA = 130°C Min 2.457 2.292 2.181 2.069 1.842 1.556 1.255 0.833 0.272 Transfer function Typ 2.485 2.318 2.205 2.092 1.864 1.574 1.279 0.859 0.303 Max 2.512 2.343 2.230 2.116 1.886 1.592 1.303 0.884 0.335 Unit V Table 4. Quadratic output equation for operations over the full voltage range (VCC = 2.4V to 5.5V) Parameter(1) Conditions TA = –55°C(2) (3) Min 2.457 2.292 2.180 2.068 1.841 1.555 1.254 0.832 0.271 Max 2.531 2.362 2.249 2.135 1.904 1.610 1.322 0.903 0.353 V Unit TA = –40°C(2) TA = –30°C Temperature error based on: VOUT = (–3.88e–6 × T2) + (–1.15e–2 × T) + 1.8639, where T is the temperature TA = –20°C TA = 0°C TA = 25°C TA = 50°C TA = 85°C TA = 1. VOUT tolerance is ±4% (temperature grade 9 only). 2. Valid for VCC min = 2.7V. 3. Valid for temperature grade 7 only. 130°C(3) 7/16 Maximum rating STLM20 3 Maximum rating 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. Symbol TSTG TSLD (1) Absolute maximum ratings Parameter Storage temperature Lead solder temperature for 10 seconds Output voltage Supply voltage Output current Maximum junction temperature SOT323-5 (SC70-5) UDFN Value –65 to +150 260 –0.6 to VCC + 0.6 –0.2 to 6.5 10 150 331.4 160.2 –55 to 130 –40 to 85 Unit °C °C V V mA °C °C/W °C/W °C °C VO VCC IO TJ(max) θJA TA(2) Thermal resistance Grade 7 Ambient operating temperature Grade 9 1. Reflow at peak temperature of 255°C to 260°C for < 30 seconds (total thermal budget not to exceed 180°C for between 90 to 150 seconds). 2. Grade 7: STLM20W87F Grade 9: STLM20DD9F 8/16 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 (see Table 6 on page 9). Designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. Table 6. Sym DC and AC characteristics Description Test condition(1) TA = –30°C to 130°C Min 2.4 2.7 1.8639 ±1.5 ±2.5 ±2.1 ±1.9 ±2.3 ±2.5 4.8 8 Typ(2) Max 5.5 5.5 Unit V V V °C °C °C °C °C °C µA VCC VO Supply voltage TA = –55°C to 130°C or –40°C to 85°C TA = 0°C TA = 25°C to 30°C TA = 125°C to 130°C Output voltage Temperature to voltage error(3) VO = (–3.88E–6 * T2) + (–1.15E–2 * T) + 1.8639V TA = 80°C to 85°C TA = 0°C TA = –40°C TA = –55°C 2.4V ≤ VCC ≤ 5.5V –30°C ≤ TA ≤ 100°C –20°C ≤ TA ≤ 80°C 2.4V ≤ VCC ≤ 5.5V IQ Quiescent current Sensor gain (temperature sensitivity or average slope), VO = –11.77mV/°C * T + 1.860V Non-linearity –11.4 –11.77 –12.2 mV/°C ±0.4 0.7 –11 % µA nA/°C µA 160 –2.5 3.3 11 Ω mV mV/V mV ΔI Q TCVO ISD ZO RegL RegI1 Change of quiescent current Temperature coefficient of quiescent current Shutdown current Output impedance Load regulation(6) Line regulation VCC ≤ 0.8V 0µA ≤ IL ≤ 16µA(4)(5) 2.4V ≤ VCC ≤ 5.0V 5.0V ≤ VCC ≤ 5.5V 0.02 RegI2 1. Valid for ambient operating temperature: TA = –55 to 130°C or TA = –40 to 85°C; VCC = 2.7V (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 1µA and source is 16µA. 5. Over the supply range of 2.4 to 5.5V. 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. 9/16 Capacitive load STLM20 5 Capacitive load The STLM20 will handle capacitive loads of up to 300pF. Over the specified temperature range, the STLM20 has a maximum output impedance of 160Ω. In a noisy environment, it may be advisable to add some filtering to minimize noise in the output voltage. A 0.1µF 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 1µF capacitor, in addition to the output impedance of the device, and a 200Ω 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 > 300pF 0.1µF Bypass Capacitor 0.1µF Bypass Capacitor GND VCC 5 5 4 RFILTER CFILTER 2 2 1 3 1 VOUT CL AI12259 3 VOUT RFILTER CL AI12260 Table 7. Resistor/capacitor combinations for the filter network RFILTER 200Ω 470Ω 680Ω 1000Ω 10kΩ 100kΩ CFILTER 1µF 0.1µF 0.01µF 1000pF 100pF 10pF 10/16 4 CFILTER GND VCC STLM20 Typical operating characteristics 6 Typical operating characteristics The graph shown in Figure 6 represents VOUT according to temperature. Figure 4. VOUT vs. Temperature 2.50 VOUT (V) 2.00 1.50 1.00 0.50 0.00 –50 –20 10 40 70 100 130 Temperature (˚C) Typical (VCC = 2.7V) ai13484 11/16 Package mechanical data STLM20 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 5. SOT323-5 – 5-lead small outline transistor package outline E E1 B 5X b 0.10 M CA s B s A1 1 D e e1 5X A 0.10 C C A2 A C s L1 C L SOT323-5 1. Drawing is not to scale. Table 8. Symbol SOT323-5 – 5-lead small outline transistor package mechanical data mm Typ Min 0.80 0 – 0.15 0.10 1.90 1.80 1.15 – – – 0.35 0° Max 1.10 0.10 – 0.30 0.20 2.10 2.40 1.35 – – – 0.45 5° Typ – – 0.035 – – 0.079 – 0.049 0.026 0.051 0.020 0.016 – inches Min 0.031 0 – 0.006 0.004 0.075 0.071 0.045 – – – 0.014 0° Max 0.043 0.004 – 0.012 0.008 0.083 0.094 0.053 – – – 0.018 5° A A1 A2 b C D E E1 e e1 L L1 s – – 0.90 – – 2.00 – 1.25 0.65 1.30 0.52 0.40 – 12/16 STLM20 Figure 6. UDFN – 4-lead package outline Package mechanical data 1. Drawing is not to scale. Table 9. Symbol UDFN – 4-lead package mechanical data mm Min Typ 0.50 0.025 0.127 0.25 1.00 1.30 0.50 0.40 0.50 0.04 Max 0.55 0.05 0.177 0.30 1.05 1.35 0.55 0.45 0.55 0.08 Min 0.018 0 0.0046 0.008 0.037 0.049 0.018 0.014 0.018 0 inches Typ 0.020 0.001 0.0050 0.010 0.039 0.051 0.020 0.016 0.020 0.0016 Max 0.022 0.002 0.0069 0.012 0.041 0.053 0.022 0.018 0.022 0.0031 A A1 A3 b D E e L L1 ddd 0.45 0 0.119 0.20 0.95 1.25 0.45 0.35 0.45 0 13/16 Part numbering STLM20 8 Part numbering Table 10. Example: Ordering information scheme 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 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. Available in temperature grade 9 (-40 to 85°C) only. Table 11. Marking description Package SOT323-5(SC70-5) UDFN Marking M20 20 Part number STLM20W8 STLM20DD For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. 14/16 STLM20 Revision history 9 Revision history Table 12. Date 28-Jun-2006 19-Jul-2006 28-Aug-2006 Revision history Revision 1 2 3 Initial release. Added Table 11: Marking description Added a footnote concerning package availability in Features on page 1 and to Table 10 and Table 11; updated package mechanical data in Table 9 Amended text in the Features on page 1, Section 1: Description, Section 2: Transfer function, Table 6, and Table 10 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) Updated Operating Temperature Ranges (now 7 and 9); updated Table 6: DC and AC characteristics Table 3: Quadratic output equation (VCC = 2.7V) and Table 4: Quadratic output equation for operations over the full voltage range (VCC = 2.4V to 5.5V) added. Section 6: Typical operating characteristics added. TA added to Table 5: Absolute maximum ratings. 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 = 2.4V to 5.5V); added footnotes regarding temperature ranges in Table 10: Ordering information scheme. Added thermal resistance in Table 5: Absolute maximum ratings. Modified Equation 1, 2, and 3. Updated footnote 2 in Table 5; minor text updates. Changes 05-Sep-2006 4 25-Sep-2006 5 10-Oct-2006 6 04-Dec-2006 7 08-Feb-2007 09-May-2007 26-Nov-2007 8 9 10 15/16 STLM20 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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