STMICROELECTRONICS STLM20DD9F

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
November 2007
UDFN 4-lead (DD)
Rev 10
1/16
www.st.com
1
Contents
STLM20
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9
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.
4/16
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
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 2.4V 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.
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.
5/16
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 × 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
–6
2
× T ) + ( – 1.15 × 10
–2
× T ) + 1.8639
and solving for T:
Equation 3
6 ( 1.8639 – V O )
T = – 1481.96 + 2.1962 × 10 + ---------------------------------–6
3.88 × 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
6/16
Tmin (°C)
Tmax (°C)
VO =
Maximum deviation of linear
equation from parabolic equation
(°C)
–55
130
–11.79mV/°C * T + 1.8528V
±1.41
–40
110
–11.77mV/°C * T + 1.8577V
±0.93
–30
100
–11.77mV/°C * T + 1.8605V
±0.70
–40
85
–11.67mV/°C * T + 1.8583V
±0.65
–10
65
–11.71mV/°C * T + 1.8641V
±0.23
35
45
–11.81mV/°C * T + 1.8701V
±0.004
20
30
–11.69mV/°C * T + 1.8663V
±0.004
Linear equation
STLM20
Transfer function
Table 3.
Quadratic output equation (VCC = 2.7V)
Parameter
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:
VOUT = (–3.88e–6 × T2) + (–1.15e–2 × 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.
Conditions
Unit
V
Quadratic output equation for operations over the full voltage range
(VCC = 2.4V to 5.5V)
Parameter(1)
Conditions
Min
Max
2.457
2.531
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
0.271
0.353
TA =
Temperature error based on:
VOUT = (–3.88e–6 × T2) + (–1.15e–2 × T) + 1.8639,
where T is the temperature
TA =
–55°C(2) (3)
130°C(3)
Unit
V
1. VOUT tolerance is ±4% (temperature grade 9 only).
2. Valid for VCC min = 2.7V.
3. Valid for temperature grade 7 only.
7/16
Maximum rating
3
STLM20
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.
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
–0.6 to VCC + 0.6
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)
θJA
TA(2)
Thermal resistance
Ambient operating temperature
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
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 (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.
DC and AC characteristics
Sym
Description
VCC
Supply voltage
VO
Output voltage
Temperature to voltage error(3)
VO = (–3.88E–6 * T2) +
(–1.15E–2 * T) + 1.8639V
IQ
ΔIQ
TCVO
Quiescent current
Test condition(1)
Min
TA = –30°C to 130°C
TA = –55°C to 130°C or
–40°C to 85°C
TA = 0°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
8
µA
2.4V ≤ VCC ≤ 5.5V
4.8
Sensor gain (temperature
sensitivity or average slope),
VO = –11.77mV/°C * T + 1.860V
–30°C ≤ TA ≤ 100°C
Non-linearity
–20°C ≤ TA ≤ 80°C
±0.4
%
Change of quiescent current
2.4V ≤ VCC ≤ 5.5V
0.7
µA
–11
nA/°C
0.02
µA
Temperature coefficient of
quiescent current
ISD
Shutdown current
ZO
Output impedance
RegL
Load regulation(6)
RegI1
Line regulation
RegI2
VCC ≤ 0.8V
–11.4 –11.77 –12.2 mV/°C
160
Ω
–2.5
mV
2.4V ≤ VCC ≤ 5.0V
3.3
mV/V
5.0V ≤ VCC ≤ 5.5V
11
mV
0µA ≤ IL ≤ 16µA(4)(5)
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
5
STLM20
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.
Filter network for noisy environments or capacitive loads > 300pF
0.1µF
Bypass Capacitor
VCC
GND
4
5
VCC
GND
5
CFILTER
3
2
1
1
RFILTER
VOUT
VOUT
RFILTER
CL
CL
AI12259
Table 7.
10/16
3
CFILTER
4
0.1µF
Bypass Capacitor
2
Figure 3.
AI12260
Resistor/capacitor combinations for the filter network
RFILTER
CFILTER
200Ω
1µF
470Ω
0.1µF
680Ω
0.01µF
1000Ω
1000pF
10kΩ
100pF
100kΩ
10pF
STLM20
Typical operating characteristics
The graph shown in Figure 6 represents VOUT according to temperature.
Figure 4.
VOUT vs. Temperature
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
11/16
Package mechanical data
7
STLM20
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
5X b
B
0.10
M
C A
s
B
A1
s
1
D
e1
e
5X
0.10 C
A
A2
C
A
C
s
L1 C
L
SOT323-5
1. Drawing is not to scale.
Table 8.
SOT323-5 – 5-lead small outline transistor package mechanical data
mm
inches
Symbol
12/16
Typ
Min
Max
Typ
Min
Max
A
–
0.80
1.10
–
0.031
0.043
A1
–
0
0.10
–
0
0.004
A2
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
E1
1.25
1.15
1.35
0.049
0.045
0.053
e
0.65
–
–
0.026
–
–
e1
1.30
–
–
0.051
–
–
L
0.52
–
–
0.020
–
–
L1
0.40
0.35
0.45
0.016
0.014
0.018
s
–
0°
5°
–
0°
5°
STLM20
Package mechanical data
Figure 6.
UDFN – 4-lead package outline
1. Drawing is not to scale.
Table 9.
UDFN – 4-lead 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
13/16
Part numbering
8
STLM20
Part numbering
Table 10.
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 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
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.
14/16
STLM20
9
Revision history
Revision history
Table 12.
Revision history
Date
Revision
28-Jun-2006
1
Initial release.
19-Jul-2006
2
Added Table 11: Marking description
28-Aug-2006
3
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
05-Sep-2006
4
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)
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 = 2.7V) 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.
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 = 2.4V to 5.5V); added footnotes regarding temperature
ranges in Table 10: 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.
10-Oct-2006
Changes
15/16
STLM20
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16/16