ST890
1.2 A current limited high-side power switch with thermal
shutdown
Datasheet - production data
Applications
PCMCIA slots
Access bus slots
Portable equipment
Description
The ST890 device is a low voltage, P-channel
MOSFET power switch intended for high-side
load switching applications.
The switch operates with inputs from 2.7 V to
5.5 V, making it ideal for both 3 V and 5 V
systems.
Features
2.7 to 5.5 V input range
Programmable current limit up to 1.2 A
Low quiescent current
Thermal shutdown
Active-low FAULT indicator output
90 mΩ (typ.) ON resistance
SO8 and DFN8L 3x3 packages
December 2016
The internal current limiting circuitry protects the
input supply against overload. The thermal
overload protection limits power dissipation and
junction temperatures.
The maximum current limit is 1.2 A. The current
limit through the switch is programmed with a
resistor from SET to ground. The devices are
available in SO8 and DFN8L 3x3 packages.
DocID8649 Rev 10
This is information on a product in full production.
1/19
www.st.com
Contents
ST890
Contents
1
Device summary .............................................................................. 3
2
Pinout information........................................................................... 4
3
4
Absolute maximum ratings and operating conditions ................. 5
Electrical information ...................................................................... 6
4.1
Characteristics and timings ............................................................... 6
4.2
Application circuit .............................................................................. 7
4.3
Functional description ....................................................................... 7
4.4
5
6
7
2/19
4.3.1
Output current limit ............................................................................. 7
4.3.2
Output short-circuit protection ............................................................ 7
4.3.3
Programming ILIM ................................................................................ 8
4.3.4
𝐅𝐀𝐔𝐋𝐓 pin........................................................................................... 8
4.3.5
Thermal protection.............................................................................. 8
Typical performance characteristics .................................................. 9
Package information ..................................................................... 10
5.1
SO8 package information ................................................................ 11
5.2
SO8 tape and reel information ........................................................ 12
5.3
DFN8L 3x3 package information ..................................................... 13
5.4
DFN8L 3x3 tape and reel information ............................................. 15
Ordering information..................................................................... 17
Revision history ............................................................................ 18
DocID8649 Rev 10
ST890
1
Device summary
Device summary
Figure 1: Schematic diagram
Table 1: Truth table for ON /OFF switch
ON /OFF
OUT
L
ON
H
OFF
Table 2: Truth table for FAULT
FAULT
FLAG
H
Normal operation
L
Fault condition
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Pinout information
2
ST890
Pinout information
Figure 2: SO8 and DFN8L 3x3 pin connections (top view)
1.
IN 1
8 FAULT
IN 2
7 OUT
ON 3
6 OUT
GND 4
5 SET
The exposed pad of the DFN8L 3x3 is not internally connected. It can be connected to the PCB
groundplane for best thermal performance.
Table 3: SO8 and DFN8L 3x3 pin description
4/19
Pin no.
Symbol
Name and function
1, 2
IN
Input P-channel MOSFET source. Bypass IN with a 1 μF capacitor to ground.
3
ON
Active-low switch ON input. A logic low turns the switch ON.
4
GND
Ground
5
SET
Set current limit input. A resistor from SET to GND sets the current limit for
the switch.
6, 7
OUT
Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 μF
capacitor to ground.
8
FAULT
Fault indicator output. This open drain output goes low when in current limit or
when the die temperature exceeds 135 °C.
DocID8649 Rev 10
ST890
3
Absolute maximum ratings and operating
conditions
Absolute maximum ratings and operating conditions
Stressing the device above the ratings listed inTable 4: "Absolute maximum ratings" 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 of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Table 4: Absolute maximum ratings
Symbol
VI
VON
VFAULT_N
VSET
Parameter
Value
Voltage at IN pin
-0.5 to 6
Input voltage at ON pin
-0.5 to 6
Input voltage at FAULT_N pin
-0.5 to 6
Voltage at SET pin
Unit
V
-0.5 to (VIN + 0.5)
IDS
Maximum continuous switching current
Tstg
Storage temperature
1.5
A
-65 to 150
°C
Table 5: Thermal data
Symbol
Rthj-amb
Parameter
SO8
160
Thermal resistance junction-ambient
(1)
DFN8L
Unit
(2)
°C/W
37.6
Notes:
(1)
This value depends on the thermal design of the PCB on which the device is mounted.
(2)This
value depends on the four-layer PCB, JEDEC standard test board. For best thermal performance, the
exposed pad PCB area should be connected by a via to the PCB groundplane.
Table 6: Operating conditions
Symbol
VI
Toper
Parameter
ST890CDR
Voltage at IN pin
ST890BDR
ST890DTR
2.7 to 5.5
Operating free-air temperature range
DocID8649 Rev 10
0 to 70
-40 to 85
Unit
V
°C
5/19
Electrical information
ST890
4
Electrical information
4.1
Characteristics and timings
Table 7: Electrical characteristics
Symbol
TA = 25 °C
Test condition (1)
Parameter
Unit
Min.
VI
Operating voltage
ID = 1 mA
ICC
ON quiescent supply current
VI = 5 V, ON = GND, IO = 0
ICCOFF
OFF quiescent supply current
VULO
Undervoltage lockout
VHYST
Undervoltage lockout
hysteresis
RON
ON resistance
VSET
Reference voltage to turn the
switch OFF
IMAX
Maximum programmable
output over current limit
Rising edge
120
VI = 3 V
90
130
1.24
1.302
IO = 100 mA,
VSET rise until VI - VO > 0.8 V
1.178
V
mΩ
V
1.2
VIH
ON input high level voltage
970
1.2
ILIM
1.5
ILIM
1110
1300
A
0.8
VI = 2.7 to 3.6 V
2
VI = 2.7 to 5.5 V
2.4
V
ON input leakage current
VI = 5.5 V
ISET bias current
VSET = 1.24 V, IO = 0, VI = VO
0.5
ISINK = 1 mA, VSET = 1.4 V
0.15
FAULT output leakage
µA
mV
75
VI = 2.7 to 5.5 V
FAULT output low voltage
2.6
VI = 4.5 V
ON input low level voltage
IOH
2.4
100
VIL
VOL
2
V
25
5
IO = 500 mA, VO > 1.6 V
ISET
bias
13
ON = IN, VI = 5.5 V, VO = 0
ILIM to ISET current ratio
II
5.5
1
Short-circuit current limit
ILIM/ISET
2.7
Max.
ON = IN, VI = VOUT = 5.5 V
VI = 5 V, OUT connected to GND,
device enabled into short-circuit
ISC
Typ.
1
VFAULT = 5.5 V, VSET = 1 V
3
µA
V
1
µA
current
TPROT
Thermal protection
130
THYST
Thermal hysteresis
15
Notes:
(1)V
IN
6/19
= 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C
DocID8649 Rev 10
°C
ST890
Electrical information
Table 8: Timing characteristics
TA = 25 °C
Parameter
Test condition (1)
Slow current loop response time
20 % current overdrive,
VCC = 5 V
Symbol
tRESP
Min.
Max.
Unit
5
Fast current loop response time
tON
Typ.
2
VI = 5 V, IO = 500 mA
25
VI = 3 V, IO = 500 mA
50
µs
50
Turn ON time
tOFF
Turn OFF time
VI = 5 V
1
2
10
Notes:
(1)V
IN
4.2
= 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C
Application circuit
Figure 3: Typical application circuit
INPUT
IN
O UT
IN
O UT
O UT PUT
0.1 μF
100 kΩ
FAULT
ON
G ND
SET
ON / OFF
1 μF
RSET
4.3
Functional description
4.3.1
Output current limit
ILIM is the output current that the ST890 device limits under the condition VO (output
voltage) > 1.6 V.
When ILIM is reached, the FAULT pin is asserted.
4.3.2
Output short-circuit protection
The ST890 device provides short-circuit protection by limiting the output current during a
short circuit event.
Isc is the output short-circuit current limit level (typ. 1.2 x ILIM). When a short circuit event
occurs on the output, such as VO < 1.6 V, the ST890 device limits the output current to no
more than the Isc level.
When a short circuit event occurs on the output, the FAULT pin is asserted.
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Electrical information
4.3.3
ST890
Programming ILIM
The ST890's ILIM can be programmed through the external resistor, RSET, connected at the
SET pin (pin 5).
ILIM is determined by the equations below.
Equation 1
I SET =
VSET
RSET
Equation 2
I LIM
= 1110
I SET
Therefore:
Equation 3
RSET = 1.24 ×
4.3.4
1110
I LIM
𝐅𝐀𝐔𝐋𝐓 pin
The FAULT pin (pin 8) is an open drain active-low output. This pin should be connected to
an external pull-up resistor.
The FAULT pin is asserted low when:
IOUT reaches the programmed ILIM value
A short-circuit event occurs
The device goes into thermal protection
4.3.5
Thermal protection
The thermal protection of the ST890 is triggered to turn off the switch when the junction
temperature exceeds 130 °C (typ.).
8/19
DocID8649 Rev 10
ST890
4.4
Electrical information
Typical performance characteristics
Unless otherwise specified Tj = 25 °C.
Figure 4: ON resistance vs. supply voltage (A)
Figure 5: ON resistance vs. supply voltage (B)
Figure 6: ON resistance vs. temperature (A)
Figure 7: ON resistance vs. temperature (B)
Figure 8: Switching waveforms (A)
Figure 9: Switching waveforms (B)
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Package information
5
ST890
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK ®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
10/19
DocID8649 Rev 10
ST890
5.1
Package information
SO8 package information
Figure 10: SO8 package outline
Table 9: SO8 mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Inches
Max.
Min.
Typ.
1.75
0.069
A1
0.10
A2
1.25
b
0.28
0.48
0.011
0.019
c
0.17
0.23
0.007
0.010
D
4.80
4.90
5.00
0.189
0.193
0.197
E
5.80
6.00
6.20
0.228
0.236
0.244
E1
3.80
3.90
4.00
0.150
0.154
0.157
e
0.25
Max
0.004
0.010
0.049
1.27
0.050
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
L1
k
ccc
1.04
0°
0.040
8°
0.10
DocID8649 Rev 10
0°
8°
0.004
11/19
Package information
5.2
ST890
SO8 tape and reel information
Figure 11: SO8 tape and reel outline
1.
Drawing not to scale
Table 10: SO8 tape and reel mechanical data
Dimensions
Symbol
mm
Min.
Typ.
A
Max.
Min.
Typ.
330
12.8
D
20.2
0.795
N
60
2.362
Ao
8.1
Bo
13.2
—
Max.
12.992
C
T
12/19
Inches
0.504
22.4
0.519
—
0.882
8.5
0.319
5.5
5.9
0.216
0.232
Ko
2.1
2.3
0.082
0.090
Po
3.9
4.1
0.153
0.161
P
7.9
8.1
0.311
0.319
DocID8649 Rev 10
0.335
ST890
5.3
Package information
DFN8L 3x3 package information
Figure 12: DFN8L 3x3 package outline
1.
2.
Drawing is not to scale
Dimensions in millimeters
DocID8649 Rev 10
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Package information
ST890
Table 11: DFN8L 3x3 mechanical data
Dimensions
Ref.
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max
A
0.80
0.85
0.90
0.031
0.033
0.035
A1
0
0.02
0.05
0
0.001
0.002
b
0.25
0.030
0.35
0.010
0.001
0.014
D
2.95
3
3.05
0.116
0.118
0.120
D2
2.30
2.40
2.50
0.091
0.094
0.098
E
2.95
3
3.05
0.116
0.118
0.120
E2
1.70
1.80
1.90
0.067
0.071
0.075
e
L
0.65
0.25
0.30
0.026
0.35
0.010
Figure 13: DFN8L 3x3 recommended footprint
1.
2.
14/19
Drawing not to scale
Dimensions in millimeters
DocID8649 Rev 10
0.012
0.014
ST890
5.4
Package information
DFN8L 3x3 tape and reel information
Figure 14: DFN8L 3x3 tape and reel outline
1.
10 sprocket hole pitch cumulative tolerance ±0.20
DocID8649 Rev 10
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Package information
ST890
Figure 15: DFN8L 3x3 reel ouline
16/19
DocID8649 Rev 10
ST890
6
Ordering information
Ordering information
Table 12: Order codes
Order code
Temperature range
ST890CDR
0 to 70 °C
ST890BDR
ST890DTR
-40 to 85 °C
Package
SO8
DFN8L 3x3
DocID8649 Rev 10
Packaging
Marking
ST890C
Tape and reel
ST890B
UD91
17/19
Revision history
7
ST890
Revision history
Table 13: Document revision history
Date
Revision
Changes
22-Jul-2005
4
Added 3 rows on Table 2 on page 3
10-Aug-2007
5
Removed ST890CD and ST890BD from Table 1 on page 1
Updated short circuit current limit value in Table 8 on page 7
1-Dec-2007
6
Added Section : Contents.
Added ST890D and related DFN8L package information.
Added Figure 2: DFN8L (3 x 3 mm) pin connection (top view) on page 4.
Figure 3: Schematic diagram on page 5: redrawn, no content change.
Modified title in Table 5: Truth table for FAULT on page 5.
Updated Table 8: Electrical characteristics on page 7.
Figure 4: Typical application circuit on page 8: redrawn, no content
change.
13-Oct-2008
7
Updated: Table 2 on page 3, Table 3 on page 4.
Added: Section 2.1: Functional description on page 9 and Figure 12 on
page 18.
04-Mar-2009
8
Replaced ST890B, ST890C and ST890D with ST890.
Modified: Table 6: Absolute maximum ratings
Updated Figure 1, Figure 3, Table 5, Section 2.1 (overlined “ FAULT ”
and “ ON ” pin, minor corrections).
25-Jan-2013
9
Updated Table 3 (added “Exposed pad”).
Added cross-references to Section 2.
Updated note 2. below Table 7.
Updated Table 8 (parameter of IOH symbol corrected to “ FAULT
output leakage current”).
Updated ECOPACK in Section 3.
Minor corrections throughout document.
12-Dec-2016
18/19
10
Updated datasheet layout
Table 4: "Absolute maximum ratings": removed reference to the "SURE"
program, updated name of parameter VI, and removed parameter Top.
Added Table 6: "Operating conditions"
Updated SO8 package information
Table 11: "DFN8L 3x3 mechanical data": added inches dimensions
Added Table 12: "Order codes"
DocID8649 Rev 10
ST890
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