STLM20 STMICROELECTRONICS | Alldatasheet
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This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. October 2006 Rev 6 STLM20 Ultra-low Current 2.4V precision analog temperature sensor Feature summary 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
Applications
Third generation (3G) cell phones Multimedia PDA devices GPS devices Portable medical instruments Voltage-controlled crystal oscillator temperature monitors RF Power transistor monitor SOT323-5, SC70-5 (W8) UDFN 4 Lead (DD)
Table 1. Table 2. Table 3. Table 4. Quadratic output equation for operations over the whole voltage range Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12.
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 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 No connect AI12252 VCC STLM20 GND(1) VOUT
Figure 2. Connections (top view) Pin 1 NC should be left floating or grounded. Pin 2 GND may be grounded or left floating. For optimum thermal conductivity to the PC board ground plane, it should be grounded. VCC GND(2) NC(1) GND VOUT AI12253 SOT323-5(SC70-5) VCC NC(1) GND VOUT AI12253_a UDFN-4Lead
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 Over the specified operating temperature range, the best accuracy can be obtained by using the parabolic transfer function: Equation 2 and solving for T: Equation 3 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 Linear equation VO = Maximum deviation of linear equation from parabolic equation (°C) Tmin (°C) Tmax (°C) –55 130 ±1.41 –40 110 ±0.93 –30 100 ±0.70 –40 ±0.65 –10 ±0.23 ±0.004 ±0.004 VO 11 69mV ° C T 1 8663V VO 3 88 10 6 1 15 10 2 T 1 8639 T 1481 96 2 1962 106 1 8639 VO 3 88 10 6
Table 3. Quadratic output equation (VCC = 2.7V) Parameter Conditions Min Typ Max Unit Temperature error based on: where T is the temperature TA = –55°C 2.457 2.485 2.512 V TA = –40°C 2.292 2.318 2.343 TA = –30°C 2.181 2.205 2.230 TA = –20°C 2.069 2.092 2.116 TA = 0°C 1.842 1.864 1.886 TA = 25°C 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. Quadratic output equation for operations over the whole voltage range (VCC = 2.4V to 5.5V) Parameter(1) VOUT tolerance is ±4% (temperature grade 9 only). Conditions Min Max Unit Temperature error based on: where T is the temperature TA = –55°C(2) (3) Valid for VCC min = 2.7V. Valid for temperature grade 7 only. 2.457 2.531 V TA = –40°C(2) 2.292 2.362 TA = –30°C 2.180 2.249 TA = –20°C 2.068 2.135 TA = 0°C 1.841 1.904 TA = 25°C 1.555 1.610 TA = 50°C 1.254 1.322 TA = 85°C 0.832 0.903 TA = 130°C(3) 0.271 0.353
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 Parameter Value Unit TSTG Storage temperature –65 to +150 TSLD (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). Lead solder temperature for 10 seconds 260 VO Output voltage –0.6 to VCC + 0.6 V VCC Supply voltage –0.2 to 6.5 V IO Output current mA TJ(max) Maximum junction temperature 150 PD Power dissipation 377 mW TA (2) Grade 7: STLM20DD7F and STLM20W87F Grade 9: STLM20DD9F and STLM20W89F. Ambient operating temperature Grade 7 –55 to 130 Grade 9 –40 to 85
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 10). 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
Test condition(1) Valid for Ambient Operating Temperature: TA = –55 to 130°C or TA = –40 to 85°C; VCC = 2.7V (except where noted). Min Typ(2) TJ = TA = 25°C. Max Unit VCC Supply voltage TA = –30°C to 130°C 2.4 5.5 V TA = –55°C to 130°C or –40°C to 85°C 2.7 5.5 V VO Output voltage TA = 0°C 1.8639 V Temperature to voltage error(3) Error accuracy is between the measured and calculated output voltage at specified conditions of voltage, current, and temperature. TA = 25°C to 30°C ±1.5 TA = 125°C to 130°C ±2.5 TA = 80°C to 85°C ±2.1 TA = 0°C ±1.9 TA = –40°C ±2.3 TA = –55°C ±2.5 IQ Quiescent current 2.4V ≤ VCC ≤ 5.5V 4.8 µA Sensor gain (temperature sensitivity or average slope), –30°C ≤ TA ≤ 100°C –11.4 –11.77 –12.2 mV/°C Non-linearity –20°C ≤ TA ≤ 80°C ±0.4 ∆IQ Change of quiescent current 2.4V ≤ VCC ≤ 5.5V 0.7 µA TCVO Temperature coefficient of quiescent current –11 nA/°C ISD Shutdown current VCC ≤ 0.8V 0.02 µA ZO Output impedance 0µA ≤ IL ≤ 16µA(4)(5) With negative current flowing into STLM20 and positive current flowing out, can typically sink less than 1µA and source is 16µA. Over the supply range of 2.4 to 5.5V. 160 Ω RegL Load regulation(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. –2.5 mV RegI1 Line regulation 2.4V ≤ VCC ≤ 5.0V 3.3 mV/V RegI2 5.0V ≤ VCC ≤ 5.5V mV
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 Table 7. Resistor/capacitor combinations for the filter network RFILTER CFILTER 200Ω 1µF 470Ω 0.1µF 680Ω 0.01µF 1000Ω 1000pF 10kΩ 100pF 100kΩ 10pF VCC RFILTER CFILTER GND 0.1µF Bypass Capacitor VOUT CL AI12259 VCC RFILTER CFILTER GND 0.1µF Bypass Capacitor VOUT CL AI12260
Typical operating characteristics STLM20 Typical operating characteristics The graph shown in Figure 6 represents VOUT according to temperature. Figure 4. VOUT vs. Temperature 0.00 0.50 1.00 1.50 2.00 2.50 –50 –20 100 130 VOUT (V) Temperature (˚C) Typical (VCC = 2.7V) ai13484
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 Drawing is not to scale. Table 8. SOT323-5 – 5-lead small outline transistor package mechanical data Symbol mm inches Typ Min Max Typ Min Max A 0.80 1.10 0.031 0.043 0.10 0.004 0.90 0.035 b 0.15 0.30 0.006 0.012 C 0.10 0.20 0.004 0.008 D 2.00 1.90 2.10 0.079 0.075 0.083 E 1.80 2.40 0.071 0.094 1.25 1.15 1.35 0.049 0.045 0.053 e 0.65 0.026 1.30 0.051 L 0.52 0.020 0.40 0.35 0.45 0.016 0.014 0.018 s SOT323-5 0.10 C A C D e 5X b E B A M 0.10 C A B s s C s L C
Figure 6. UDFN – 4-lead package outline Drawing is not to scale. Table 9. UDFN - 4 lead mechanical data Symbol mm inches Min Typ Max Min Typ Max A 0.45 0.50 0.55 0.018 0.020 0.022 0.025 0.05 0.001 0.002 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 0.45 0.50 0.55 0.018 0.020 0.022 ddd 0.04 0.08 0.0016 0.0031
Table 10. Ordering information scheme For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you. Example: STLM20 DD F Device type STLM20 Package W8 = SOT323-5 (SC70-5) DD= UDFN - ultra thin DFN4 lead Temperature range Contact local sales office for availability 9 = –40 to 85°C Shipping method F = ECOPACK package, tape & reel Table 11. Marking description Part number Package Marking STLM20W8 SOT323-5(SC70) M20 STLM20DD UDFN
Revision history
Table 12. Initial release. 19-Jul-2006 Added Table 11: Marking description 28-Aug-2006 Added a footnote concerning package availability in Feature summary on page 1 and to Table 10 and Table 11; updated package mechanical data in Table 9 05-Sep-2006 Amended text in the Feature summary on page 1, Section 1: Summary description, Section 2: Transfer function, Table 6, and Table 10 to elucidate that 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) 25-Sep-2006 Updated Operating Temperature Ranges (now 7 and 9); updated Table 6: DC and AC characteristics 10-Oct-2006 Table 3: Quadratic output equation (VCC = 2.7V) and Table 4: Quadratic output equation for operations over the whole voltage range (VCC = 2.4V to 5.5V) added. Section 6: Typical operating characteristics added. TA added to Table 5: Absolute maximum ratings.