STMICROELECTRONICS ST890CDR

ST890
1.2 A current limited high side power switch
with thermal shutdown
Features
■
2.7 V 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
DFN8L
(3 x 3 mm)
Description
Applications
■
PCMCIA slots
■
Access bus slots
■
Portable equipment
The ST890 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.
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 SO-8 and DFN8L (3 x 3 mm)
packages.
Table 1.
March 2009
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
Rev 8
1/20
www.st.com
20
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.5
Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
ST890
1
Device summary
Device summary
Figure 1.
SO-8 pin connection (top view)
IN 1
8 FAULT
IN 2
7 OUT
ON 3
6 OUT
GND 4
5 SET
CS07570
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 = 1.24x1110/ 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
3/20
Device summary
ST890
Figure 2.
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.
4/20
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 = 1.24x1110/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
ST890
Device summary
Figure 3.
Schematic diagram
OUT
IN
-
+
ON
/FAULT
Replica
amplifier
+
SET
ON
-
1.24V
Current limit
amplifier
Control
circuitry
/ON
GND
CS00026
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
5/20
Maximum rating
2
ST890
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 6.
Absolute maximum ratings
Symbol
Parameter
VI
VON
VFAULT_N
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 (VIN +0.5)
V
1.5
A
Voltage at SET pin
VSET
IDS
Maximum continuous switching current
Tstg
Storage temperature
-65 to +150
°C
Top
Operating ambient temperature range
-40 to +85
°C
Table 7.
Thermal data
Symbol
Parameter
SO-8
DFN8L
Unit
Rthj-amb
Thermal
resistance
junction-ambient
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.
Table 8.
Electrical characteristics
Value
Symbol
Parameter
Test condition(1)
TA = 25°C
Min
VI
Operating voltage ID = 1 mA
ICC
ON quiescent
supply current
I(CCOFF)
6/20
OFF quiescent
supply current
VI = 5 V,
ON = GND
IO = 0
Typ
2.7
13
Unit
Max
5.5
V
25
μA
ON = IN
VI = VOUT = 5.5 V
1
ON = IN
VI = 5.5 V
VO = 0
5
μA
ST890
Maximum rating
Table 8.
Electrical characteristics (continued)
Value
Symbol
Parameter
VULO
Undervoltage
lockout
VHYST
Undervoltage
lockout hysteresis
RON
VSET
IMAX
ISC
ILIM/ISET
ON resistance
Test condition(1)
Rising edge
Min
Typ
Max
2.0
2.4
2.6
V
mV
VI = 4.5 V
75
120
mΩ
VI = 3 V
90
130
mΩ
1.24
1.302
Reference voltage IO = 100 mA
to turn the switch VSET rise until VI - VO >
OFF
0.8V
1.178
V
Maximum
programmable
output over
current limit
Short circuit
current limit
Unit
100
1.2
A
VI = 5V, OUT connected
to GND, device enabled
into short circuit
ILIM to ISET current IO = 500 mA
ratio
VO > 1.6 V
VIL
ON input low level
VI = 2.7 to 5.5 V
voltage
VIH
ON input high
level voltage
970
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
ON input leakage
current
VI = 5.5 V
ISET bias
ISET bias current
VSET = 1.24 V
IO = 0A
VI = VO
VOL
FAULT output low
voltage
IOH
FAULT output high VFAULT = 5.5 V
voltage
VSET = 1 V
II
TA = 25°C
ISINK = 1 mA
VSET = 1.4 V
0.5
1
μA
3
μA
0.15
V
1
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
7/20
Maximum rating
ST890
Table 9.
Timing characteristics
Value
Symbol
Parameter
Test condition(1)
TA = 25°C
Min
Slow current loop
response time
tRESP
tON
Typ
20% current overdrive,
VCC = 5 V
Fast current loop
response time
Unit
Max
5
μs
2
μs
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
μs
μs
10
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
GND
SET
OUTPUT
0.1μF
ON/OFF
1μF
R SET
CS00027
8/20
ST890
Maximum rating
2.1
Functional description
2.1.1
Output current limit
ILIM is the output current that ST890 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 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 short circuit
such as VO < 1.6 V, the ST890 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
ISET = VSET / R SET
Equation 2
ILIM / ISET = 1110
therefore:
Equation 3
R SET = 1.24 x 1110 / ILIM
2.1.4
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).
9/20
Maximum rating
2.2
ST890
Typical performance characteristics
Unless otherwise specified Tj = 25 °C.
10/20
Figure 5.
ON resistance vs. supply voltage
Figure 6.
ON resistance vs. temperature
ST890
Maximum rating
Figure 7.
VCC=5V, R L=0.6Ω
Switching waveforms
VCC=5V, R L=0.32Ω
11/20
Package mechanical data
3
ST890
Package mechanical data
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 8.
SO-8 package drawing
0016023/C
1. Drawing not to scale.
12/20
ST890
Package mechanical data
Table 10.
SO-8 package mechanical data
millimeters
inches
Symbol
Min
Typ
Max
Min
Typ
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
8°(max)
0.1
0.04
13/20
Package mechanical data
Figure 9.
ST890
SO-8 tape and reel specifications
1. Drawing not to scale.
Table 11.
SO-8 tape and reel mechanical data
millimeters
inches
Symbol
Min
A
Max
Min
330
13.2
Typ
Max
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
14/20
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
ST890
Package mechanical data
Figure 10. DFN8L (3 x 3 mm) package drawing
PO8092726_A
1. Drawing is not to scale.
2. Dimensions in millimeters.
15/20
Package mechanical data
Table 12.
ST890
DFN8L (3 x 3 mm) package mechanical data
millimeters
Symbol
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.
16/20
ST890
Package mechanical data
Figure 12. DFN8L (3 x 3 mm) tape and reel specifications
17/20
Package mechanical data
Figure 13. DFN8L (3 x 3 mm) reel specifications
18/20
ST890
ST890
4
Revision history
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 6
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 6.
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 17.
04-Mar-2009
8
Replaced ST890B, ST890C and ST890D with ST890.
Modified: Table 6: Absolute maximum ratings
19/20
ST890
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20/20