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STLM20
Ultra-low current 2.4V precision analog temperature sensor
Features

Precision analog voltage output temperature sensor 1.5C temperature accuracy at 25C Ultra-low quiescent supply current: 8.0A (max) Operating voltage range: 2.4V to 5.5V Operating temperature range: -55C to 130C (grade - 7) -40C to 85C (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
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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
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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
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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 -55C to 130C (grade 7) or -40C to 85C (grade 9) temperature range. The power supply operating range is 2.4V to 5.5V. The accuracy of the STLM20 is 1.5C, at an ambient temperature of 25C. The temperature error increases linearly and reaches a maximum of 2.5C 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 +130C and -55C. Decreasing the power supply voltage to 2.4V changes the negative extreme to -30C, while the positive remains at +130C. The STLM20 has a maximum quiescent supply current of 8A. 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.
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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 25C 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 and solving for T: Equation 3
6 ( 1.8639 - V O ) T = - 1481.96 + 2.1962 x 10 + ----------------------------------6 3.88 x 10 -6
x T ) + ( - 1.15 x 10
2
-2
x 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
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STLM20 Table 3. Quadratic output equation (VCC = 2.7V)
Parameter Conditions TA = -55C TA = -40C TA = -30C TA = -20C Temperature error based on: -6 2 -2 VOUT = (-3.88e x T ) + (-1.15e x T) + 1.8639 TA = 0C where T is the temperature TA = 25C TA = 50C TA = 85C TA = 130C 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 = -55C(2) (3) TA = -40C(2) 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 = -30C Temperature error based on: VOUT = (-3.88e-6 x T2) + (-1.15e-2 x T) + 1.8639, where T is the temperature TA = -20C TA = 0C TA = 25C TA = 50C TA = 85C TA = 130C(3)
1. VOUT tolerance is 4% (temperature grade 9 only). 2. Valid for VCC min = 2.7V. 3. Valid for temperature grade 7 only.
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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) VO VCC IO TJ(max)
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
JA
TA(2)
Thermal resistance
Grade 7 Ambient operating temperature Grade 9
1. Reflow at peak temperature of 255C to 260C for < 30 seconds (total thermal budget not to exceed 180C for between 90 to 150 seconds). 2. Grade 7: STLM20W87F Grade 9: STLM20DD9F
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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 = -30C to 130C 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 A
VCC VO
Supply voltage
TA = -55C to 130C or -40C to 85C TA = 0C TA = 25C to 30C TA = 125C to 130C
Output voltage
Temperature to voltage error(3) VO = (-3.88E-6 * T2) + (-1.15E-2 * T) + 1.8639V
TA = 80C to 85C TA = 0C TA = -40C TA = -55C 2.4V VCC 5.5V -30C TA 100C -20C TA 80C 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 % A nA/C A 160 -2.5 3.3 11 mV mV/V mV
IQ TCVO ISD ZO RegL RegI1
Change of quiescent current Temperature coefficient of quiescent current Shutdown current Output impedance Load regulation(6)
VCC 0.8V 0A IL 16A(4)(5) 2.4V VCC 5.0V 5.0V VCC 5.5V
0.02
Line regulation RegI2
1. Valid for ambient operating temperature: TA = -55 to 130C or TA = -40 to 85C; VCC = 2.7V (except where noted). 2. TJ = TA = 25C. 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 1A and source is 16A. 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.
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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 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 1F 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. Figure 3. Filter network for noisy environments or capacitive loads > 300pF
0.1F Bypass Capacitor 0.1F 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 200 470 680 1000 10k 100k CFILTER 1F 0.1F 0.01F 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
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Package mechanical data
STLM20
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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 -
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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
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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 130C 9 = -40 to 85C
Shipping method F = ECOPACK(R) package, tape & reel
1. Available in temperature grade 7 (-55 to 130C) only. 2. Available in temperature grade 9 (-40 to 85C) 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.
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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 130C) and UDFN 4-lead package (-40 to 85C) 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
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STLM20
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