STMICROELECTRONICS STLM20W8

STLM20
Ultra-low Current 2.4V precision analog temperature sensor
Preliminary Data
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
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
October 2006
UDFN 4 Lead (DD)
Rev 6
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/17
www.st.com
1
Contents
STLM20
Contents
1
Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
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 . . . . . . . . . . . . . . . . . . . . . 7
Quadratic output equation (VCC = 2.7V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Quadratic output equation for operations over the whole voltage range
(VCC = 2.4V to 5.5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SOT323-5 – 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13
UDFN - 4 lead mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3/17
List of figures
STLM20
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
4/17
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Filter network for noisy environments or capacitive loads > 300pF . . . . . . . . . . . . . . . . . . 11
VOUT vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SOT323-5 – 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13
UDFN – 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
STLM20
1
Summary description
Summary 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
No connect
5/17
Summary description
Figure 2.
STLM20
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.
6/17
STLM20
2
Transfer function
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
8639 – V O )
6 ( 1∴
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
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
7/17
Transfer function
Table 3.
STLM20
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:
–6
2
–2
VOUT = (–3.88e × T ) + (–1.15e × 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
V
Quadratic output equation for operations over the whole voltage range
(VCC = 2.4V to 5.5V)
Parameter(1)
Conditions
Min
Max
TA = –55°C(2) (3)
2.457
2.531
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
TA =
Temperature error based on:
VOUT = (–3.88e–6 × T2) + (–1.15e–2 × T) + 1.8639,
where T is the temperature
1. VOUT tolerance is ±4% (temperature grade 9 only).
2. Valid for VCC min = 2.7V.
3. Valid for temperature grade 7 only.
8/17
Unit
–40°C(2)
Unit
V
STLM20
3
Maximum rating
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
Power dissipation
377
mW
Grade 7
–55 to 130
°C
Grade 9
–40 to 85
°C
TJ(max)
PD
TA(2)
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: STLM20DD7F and STLM20W87F
Grade 9: STLM20DD9F and STLM20W89F.
9/17
DC and AC characteristics
4
STLM20
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 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
VCC
Supply voltage
VO
Output voltage
∆IQ
TCVO
Quiescent current
TA = –30°C to 130°C
TA = –55°C to 130°C or
–40°C to 85°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
Min
TA = 0°C
Temperature to voltage error(3)
VO = (–3.88E–6 * T2) +
(–1.15E–2 * T) + 1.8639V
IQ
Test condition(1)
(6)
Load regulation
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.
10/17
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
RFILTER
VOUT
VOUT
RFILTER
CL
CL
AI12259
Table 7.
3
CFILTER
4
0.1µF
Bypass Capacitor
2
Figure 3.
1
5
Capacitive load
AI12260
Resistor/capacitor combinations for the filter network
RFILTER
CFILTER
200Ω
1µF
470Ω
0.1µF
680Ω
0.01µF
1000Ω
1000pF
10kΩ
100pF
100kΩ
10pF
11/17
Typical operating characteristics
6
STLM20
Typical operating characteristics
The graph shown in Figure 6 represents VOUT according to temperature.
Figure 4.
VOUT vs. Temperature
VOUT (V)
2.50
2.00
1.50
1.00
0.50
0.00
–50
–20
10
40
70
100
130
Temperature (˚C)
Typical (VCC = 2.7V)
12/17
ai13484
STLM20
7
Package mechanical
Package mechanical
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
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°
13/17
Package mechanical
Figure 6.
STLM20
UDFN – 4-lead package outline
1. Drawing is not to scale.
Table 9.
UDFN - 4 lead mechanical data
mm
inches
Symbol
14/17
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
STLM20
8
Part numbering
Part numbering
Table 10.
Ordering information scheme
Example:
STLM20
DD
9
F
Device type
STLM20
Package
W8 = SOT323-5 (SC70-5)
DD= UDFN - ultra thin DFN4 lead
Temperature range
7 = –55 to 130°C(1)
9 = –40 to 85°C
Shipping method
F = ECOPACK package, tape & reel
1. Contact local sales office for availability
Table 11.
Marking description
Part number
Package
Marking
STLM20W8
SOT323-5(SC70)
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.
15/17
Revision history
9
STLM20
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 Feature
summary 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 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
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 whole voltage
range (VCC = 2.4V to 5.5V) added. Section 6: Typical operating
characteristics added.
TA added to Table 5: Absolute maximum ratings.
10-Oct-2006
16/17
Changes
STLM20
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17/17