ST890 1.2 A current limited high-side power switch with thermal shutdown Features

ST890 1.2 A current limited high-side power switch with thermal shutdown Features
ST890
1.2 A current limited high-side power switch with thermal shutdown
Datasheet - production data
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
■
SO-8 and DFN8L (3 x 3 mm) packages
SO-8
Applications
■
PCMCIA slots
■
Access bus slots
■
Portable equipment
DFN8L
(3 x 3 mm)
The internal current limiting circuitry protects the
input supply against overload. The thermal
overload protection limits power dissipation and
junction temperatures.
Description
The ST890 device is a low voltage, P-channel
MOSFET power switch intended for high-side
load switching applications.
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 SO-8 and DFN8L (3 x 3 mm)
packages.
The switch operates with inputs from 2.7 V
to 5.5 V, making it ideal for both 3 V and 5 V
systems.
Table 1.
Device summary
Order code
Package
Packaging
ST890BDR
SO-8
2500 parts per reel
ST890CDR
SO-8
2500 parts per reel
ST890DTR
DFN8L (3 x 3 mm)
3000 parts per reel
January 2013
This is information on a product in full production.
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www.st.com
21
Contents
ST890
Contents
1
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
2.2
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1
Output current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2
Output short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.3
Programming ILIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.4
FAULT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.5
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
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ST890
1
Device summary
Device summary
Figure 1.
SO-8 pin connection (top view)
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#36
Table 2.
SO-8 pin description
Pin n.
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. RSET = 1.24 x 1110 / ILIM, where ILIM is the desired current limit in
Amperes.
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.
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Device summary
Figure 2.
ST890
DFN8L (3 x 3 mm) pin connection (top view)
IN
1
8
FAULT
IN
2
7
OUT
ON
3
6
OUT
GND
4
5
SET
CS00025
Table 3.
4/21
DFN8L (3 x 3 mm) pin description
Pin n.
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.
RSET = 1.24 x 1110 / ILIM, where ILIM is the desired current limit in Amperes.
8
FAULT
Fault indicator output. This open drain output goes low when in current limit or
when the die temperature exceeds 135 °C.
Exposed
pad
NC
The exposed pad is not internally connected. It can be connected to PCB
groundplane for best thermal performance.
Doc ID 8649 Rev 9
ST890
Device summary
Figure 3.
Schematic diagram
OUT
IN
-
+
ON
FAULT
Replica
amplifier
+
SET
ON
-
1.24 V
Current limit
amplifier
Control
circuitry
ON
GND
CS00026V1
Table 4.
Table 5.
Truth table for ON/OFF switch
ON/OFF
OUT
L
ON
H
OFF
Truth table for FAULT
FAULT
FLAG
H
Normal operation
L
Fault condition
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Maximum rating
2
ST890
Maximum rating
Stressing the device above the rating listed inTable 6: 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 inTable 8: Electrical characteristics 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 6.
Absolute maximum ratings
Symbol
VI
VON
VFAULT_N
VSET
Parameter
Value
Unit
Supply voltage
-0.5 to +6
V
Input voltage at ON pin
-0.5 to +6
V
Input voltage at FAULT_N pin
-0.5 to +6
V
-0.5 to (V IN +0.5)
V
1.5
A
Voltage at SET pin
IDS
Maximum continuous switching current
Tstg
Storage temperature
-65 to +150
°C
Top
Operating ambient temperature range
-40 to +85
°C
Table 7.
Symbol
R thj-amb
Thermal data
Parameter
Thermal resistance junction-ambient
SO-8
DFN8L
Unit
160(1)
37.6(2)
°C/W
1. This value depends from thermal design of PCB on which the device is mounted.
2. This value depends from the 4-layer PCB, JEDEC standard test board. For best thermal performance, the
exposed pad PCB area should be connected by via to the PCB groundplane.
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ST890
Table 8.
Maximum rating
Electrical characteristics
Value
Symbol
Parameter
Test
condition(1)
TA = 25 °C
Min.
VI
Operating voltage
ID = 1 mA
ICC
ON quiescent supply current
VI = 5 V,
ON = GND
IO = 0
Typ.
2.7
13
ON = IN
VI = VOUT = 5.5 V
I(CCOFF)
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
ISC
ILIM/ISET
VIL
VIH
II
FAULT output leakage current.
5
2.0
2.4
2.6
V
mV
VI = 3 V
90
130
mΩ
1.24
1.302
IO = 100 mA
VSET rise until VI - VO > 0.8 V
1.178
1.2
VI = 2.7 to 5.5 V
IOH
μA
mΩ
ON input low level voltage
FAULT output low voltage
μA
120
IO = 500 mA
VO > 1.6 V
VOL
25
75
ILIM to ISET current ratio
ISET bias ISET bias current
V
VI = 4.5 V
VI = 5 V, OUT connected to GND,
device enabled into short-circuit
ON input leakage current
5.5
100
Short-circuit current limit
ON input high level voltage
Max.
1
ON = IN
VI = 5.5 V
VO = 0
Rising edge
Unit
970
V
A
1.2 ILIM
1.5 ILIM
1110
1300
0.8
A
V
VI = 2.7 to 3.6 V
2.0
V
VI = 2.7 to 5.5 V
2.4
V
VI = 5.5 V
VSET = 1.24 V
IO = 0A
VI = VO
0.5
ISINK = 1 mA
VSET = 1.4 V
0.15
VFAULT = 5.5 V
1
μA
3
μA
V
1
VSET = 1 V
μA
TPROT
Thermal protection
130
°C
THYST
Thermal hysteresis
15
°C
1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C.
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Maximum rating
ST890
Table 9.
Timing characteristics
Value
Symbol
Parameter
Test condition(1)
TA = 25 °C
Min.
Slow current loop
response time
tRESP
tON
tOFF
20% current overdrive,
VCC = 5 V
Fast current loop
response time
Turn ON time
Turn OFF time
Typ.
μs
2
μs
25
VI = 3 V
IO = 500 mA
50
1
Max.
5
VI = 5 V
IO = 500 mA
VI = 5 V
Unit
2
50
μs
μs
10
μs
1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C.
Figure 4.
Typical application circuit
INPUT
100 k Ω
IN
OUT
IN
OUT
FAULT
ON
OUTPUT
0.1 μF
ON/OFF
1 μF
GND
SET
RSET
CS00027V1
8/21
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ST890
Maximum rating
2.1
Functional description
2.1.1
Output current limit
ILIM is the output current that ST890 device limits under the condition VO (output voltage)
> 1.6 V.
When ILIM is reached, the FAULT pin is asserted.
2.1.2
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 the output is shortcircuit such as VO < 1.6 V, the ST890 device limits the output current to no more than the Isc
level.
When the output is short-circuit, the FAULT pin is asserted.
2.1.3
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 following relationships:
Equation 1
V SET
I SET = ------------R SET
Equation 2
I LIM
---------- = 1110
ISET
therefore:
Equation 3
1110
R SET = 1.24 × ------------I LI M
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Maximum rating
2.1.4
ST890
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:
2.1.5
●
IOUT reaches the programmed ILIM value
●
A short-circuit event occurs
●
The device goes into thermal protection
Thermal protection
The ST890's thermal protection is triggered to turn off the switch when the junction
temperature exceeds 130 °C (typ.).
10/21
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ST890
2.2
Maximum rating
Typical performance characteristics
Unless otherwise specified Tj = 25 °C.
Figure 5.
ON resistance vs. supply voltage
Figure 6.
ON resistance vs. temperature
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Maximum rating
Figure 7.
12/21
ST890
Switching waveforms
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ST890
3
Package mechanical data
Package mechanical data
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.
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Package mechanical data
Figure 8.
ST890
SO-8 package outline
0016023/C
1. Drawing not to scale.
Table 10.
SO-8 package mechanical data
Dimensions
Symbol
millimeters
Min.
Typ.
inches
Max.
Min.
Max.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
ddd
14/21
Typ.
8° (max.)
0.1
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0.04
ST890
Package mechanical data
Figure 9.
SO-8 tape and reel specifications
1. Drawing is not to scale.
Table 11.
SO-8 tape and reel mechanical data
Dimensions
Symbol
millimeters
Min.
A
Typ.
inches
Max.
Min.
330
Max.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Typ.
0.504
22.4
0.519
0.882
Ao
8.1
8.5
0.319
0.335
Bo
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
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Package mechanical data
ST890
Figure 10. DFN8L (3 x 3 mm) package outline
PO8092726_A
1. Drawing is not to scale.
2. Dimensions in millimeters.
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ST890
Package mechanical data
Table 12.
DFN8L (3 x 3 mm) package mechanical data
Dimensions
Symbol
millimeters
Min.
Typ.
Max.
A
0.80
0.85
0.90
A1
0
0.02
0.05
b
0.25
0.030
0.35
D
2.95
3
3.05
D2
2.30
2.40
2.50
E
2.95
3
3.05
E2
1.70
1.80
1.90
e
L
0.65
0.25
0.30
0.35
Figure 11. DFN8L (3 x 3 mm) footprint recommendations
FR8092726_A
1. Drawing not to scale.
2. Dimensions in millimeters.
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Package mechanical data
ST890
Figure 12. DFN8L (3 x 3 mm) tape and reel specifications
18/21
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ST890
Package mechanical data
Figure 13. DFN8L (3 x 3 mm) reel specifications
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Revision history
4
ST890
Revision history
Table 13.
Document revision history
Date
Revision
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
9
Updated Figure 1, Figure 3, Table 5, Section 2.1 (overlined “FAULT”
and “ON” pin, minor corrections).
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.
25-Jan-2013
20/21
Changes
Doc ID 8649 Rev 9
ST890
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