STMPS2242, STMPS2252
STMPS2262, STMPS2272
Enhanced dual-channel power switches
Features
■
100 mΩ high-side MOSFET switch
■
500 mA/1000 mA continuous current per
channel
■
Thermal protection
■
Independent short-circuit protection with
overcurrent logic output
■
Operating range from 2.7 V to 5.5 V
■
CMOS and TTL compatible inputs
■
2.5 ms typical rise time
■
Undervoltage lockout
■
13 µA maximum standby supply current
■
Ambient temperature range: -40 °C to 85 °C
■
8 kV ESD protection
■
Reverse current protection
■
Fault blanking
SO-8
MSOP8
Each switch is controlled by an independent logic
enable input. When the output load exceeds the
current limit threshold or a short is present, these
devices limit the output current to a safe level by
switching into a constant current mode, pulling the
overcurrent (OCx) logic output low. When
continuous heavy overloads and short-circuits
increase the power dissipation in the switch,
causing the junction temperature to rise, a
thermal protection circuit shuts off the switch to
prevent damage. Recovery from a thermal
shutdown is automatic once the device has
cooled sufficiently. Internal circuitry ensures the
switch remains off until valid input voltage is
present.
Description
The STMPS2242/2252/2262/2272 power
distribution switches are intended for applications
where heavy capacitive loads and short-circuits
are likely to be encountered. These devices
incorporate 100 mΩ MOSFET high-side power
switches for power distribution systems that
require multiple power switches in a single
package.
Table 1.
Device summary
Order code
Current limit
Enable
Packing
500
Active low
Tape and reel
STMPS2252TTR
500
Active high
Tape and reel
STMPS2262MTR
STMPS2262TTR
1000
Active low
Tape and reel
STMPS2272MTR
STMPS2272TTR
1000
Active high
Tape and reel
SO-8
MSOP8(1)
(mA)
STMPS2242MTR
STMPS2242TTR
STMPS2252MTR
1. MSOP8 is also known as TSSOP8.
January 2011
Doc ID 15050 Rev 3
1/42
www.st.com
42
Contents
STMPS2242, STMPS2252, STMPS2262, STMPS2272
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
3.1
Fault blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Overcurrent/overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3
Reverse current blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4
UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
Absolute maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1
6.2
7
2/42
6.1.1
Turn-on/off characteristics for VI = 3 V, RLOAD = 6 Ω . . . . . . . . . . . . . . . 13
6.1.2
Turn-on/off characteristics for VI = 5 V, RLOAD = 10 Ω . . . . . . . . . . . . . . 16
6.1.3
UVLO characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.4
Overcurrent protection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1.5
Other electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
STMPS2262, STMPS2272 characteristics . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2.1
Turn-on/off characteristics for VI = 3 V, RLOAD = 3 Ω . . . . . . . . . . . . . . . 24
6.2.2
Turn-on/off characteristics for VI = 5 V, RLOAD = 5 Ω . . . . . . . . . . . . . . . 27
6.2.3
UVLO characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.2.4
Overcurrent protection characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.5
Other electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1
8
STMPS2242, STMPS2252 characteristics . . . . . . . . . . . . . . . . . . . . . . . . 13
Input and output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Doc ID 15050 Rev 3
STMPS2242, STMPS2252, STMPS2262, STMPS2272
9
Contents
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Doc ID 15050 Rev 3
3/42
List of tables
STMPS2242, STMPS2252, STMPS2262, STMPS2272
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.
Table 13.
Table 14.
Table 15.
4/42
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Current limit characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 10
Supply current characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 11
Thermal characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 11
UVLO characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 12
OCx pin characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 12
ENx pin characteristics
(VI = 5.5 V, IO = rated current, TJ = 25°C, unless otherwise specified) . . . . . . . . . . . . . . . 12
SO-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
MSOP8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Reel mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Doc ID 15050 Rev 3
STMPS2242, STMPS2252, STMPS2262, STMPS2272
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Turn-on for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Turn-on for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Turn-on for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Turn-off for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Turn-off for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Turn-off for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Turn-on for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Turn-on for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Turn-on for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Turn-off for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Turn-off for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Turn-off for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
UVLO, VI rising . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
UVLO, VI falling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Overcurrent protection characteristics, VI = 3 V, RLOAD = 2.2 Ω . . . . . . . . . . . . . . . . . . . . 21
Overcurrent protection characteristics, VI = 5 V, RLOAD = 2.2 Ω . . . . . . . . . . . . . . . . . . . . 21
ICC versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
tr versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
tf versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Rds(on) versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Turn-on for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Turn-on for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Turn-on for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Turn-off for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Turn-off for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Turn-off for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Turn-on for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Turn-on for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Turn-on for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Turn-off for CLOAD = 1 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Turn-off for CLOAD = 100 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Turn-off for CLOAD = 470 µF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
UVLO, VI rising . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
UVLO, VI falling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Overcurrent protection characteristics, VI = 3 V, RLOAD = 1 Ω . . . . . . . . . . . . . . . . . . . . . . 32
Overcurrent protection characteristics, VI = 5 V, RLOAD = 1 Ω . . . . . . . . . . . . . . . . . . . . . . 32
ICC versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
tr versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
tf versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Rds(on) versus VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SO-8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
MSOP8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SO-8 carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
MSOP8 carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Reel information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Doc ID 15050 Rev 3
5/42
Block diagram
1
STMPS2242, STMPS2252, STMPS2262, STMPS2272
Block diagram
Figure 1.
Block diagram
/54
).
#URRENT
SENSE
%.
$RIVER
/#
56,/
4HERMAL
SENSE
&AULTBLANKINGREPORTING
DRIVERCONTROLUNIT
/#
#URRENT
SENSE
%.
/54
$RIVER
!-6
6/42
Doc ID 15050 Rev 3
STMPS2242, STMPS2252, STMPS2262, STMPS2272
2
Pin descriptions
Pin descriptions
Figure 2.
Table 2.
Pinout
GND
1
8
OC1
IN
2
7
OUT1
EN1
3
6
OUT2
EN2
4
5
OC2
Pin descriptions
Pin number
Name
Type
Function
1
GND
2
IN
−
−
3
EN1/EN1
I
Channel 1 active low (STMPS2242 and STMPS2262)
or active high (STMPS2252 and STMPS2272) enable
4
EN2/EN2
I
Channel 2 active low (STMPS2242 and STMPS2262)
or active high (STMPS2252 and STMPS2272) enable
5
OC2
O
Open drain output for fault indication of channel 2
6
OUT2
7
OUT1
−
−
8
OC1
O
Ground
VCC input, 2.7 - 5.5 V
Output of channel 2
Output of channel 1
Open drain output for fault indication of channel 1
Doc ID 15050 Rev 3
7/42
Functional description
STMPS2242, STMPS2252, STMPS2262, STMPS2272
3
Functional description
3.1
Fault blanking
The STMPS devices feature a 10 ms fault blanking. Fault blanking allows current-limit faults,
including momentary short-circuit faults that occur when hot-swapping a capacitive load,
and also ensures that no fault is issued during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If the load fault persists beyond the
10 ms fault-blanking timeout, the FAULT output asserts “low”. Load-transient faults less than
10 ms (typ.) do not cause a FAULT output assertion. Only current-limit faults have faultblanking. Die overtemperature faults and input voltage drops below the UVLO threshold
cause an immediate fault output.
3.2
Overcurrent/overtemperature protection
In overcurrent or short-circuit condition, the switch limits the current at 500 mA for
STMPS2242/STMPS2252 and 1000 mA for STMPS2262/STMPS2272. If the temperature
of the die goes above the limit value, the switch turns OFF.
3.3
Reverse current blocking
When the switch is OFF, or when the STMPS device is not powered (VCC=0 V), the switch
behaves as a Hi-Z at the output pin, ensuring that no reverse current will flow into the device
when VI
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