Preliminary Data
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
1/17
1
STLM20
Ultra-low Current 2.4V precision analog temperature sensor
Feature summary
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
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)
www.st.com
Contents
STLM20
2/17
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
STLM20
List of tables
3/17
List of tables
Table 1.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2.
First order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 7
Table 3.
Quadratic output equation (V
CC
= 2.7V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4.
Quadratic output equation for operations over the whole voltage range
(V
CC
= 2.4V to 5.5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5.
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6.
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 7.
Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 8.
SOT323-5 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13
Table 9.
UDFN - 4 lead mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10.
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 11.
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 12.
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
List of figures
STLM20
4/17
List of figures
Figure 1.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2.
Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3.
Filter network for noisy environments or capacitive loads > 300pF . . . . . . . . . . . . . . . . . . 11
Figure 4.
V
OUT
vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5.
SOT323-5 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6.
UDFN 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
STLM20
Summary description
5/17
1
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 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
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
V
CC
Supply voltage
GND
Ground
V
OUT
Output voltage
NC
No connect
AI12252
VCC
STLM20
GND
(1)
VOUT
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