Not recommended for new design
This is information on a product still in production but not recommended for new designs.
November 2010 Doc ID 9994 Rev 4 1/14
14
ST2052
Current limited
power distribution switches
Features
■80 mΩ high-side MOSFET switch
■500 mA continuous current per channel
■independent thermal and short-circuit
protection with overcurrent logic output
■Operating range from 2.7 V to 5.5 V
■CMOS- and TTL-compatible enable inputs
■10 ms OC_N fault-blanking
■2.5 ms typical rise time
■Undervoltage lock out
■10 μA maximum standby supply current
■Ambient temperature range, -40 °C to 85 °C
■ESD protection
Table 1. Device summary
SO-8
Order code Package Packaging
ST2052BD(1)
1. Not recommended for new design (refer to STMPS2252MTR). Contact ST sales office for availability.
SO-8 Tube
(50 parts per tube, 40 tube per box)
ST2052BDR(1) SO-8 Tape and reel (2500 parts per reel)
www.st.com
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Contents ST2052
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Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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ST2052 Description
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1 Description
The ST2052 power distribution switches is intended for application where heavy capacitive
loads and short -circuits are likely to be encountered. These devices incorporate 80 mΩ
N-channel MOSFET high-side power switches for power-distribution systems that require
multiple powers switches in a single package. Each switch is controlled by an independent
logic enable input. Gate drive is provided by an internal charge pump designed to control the
power-switch rise times and fall times to minimize current surges during switching. The
charge pump requires no external components and allows operation from supplies as low as
2.7 V.
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. A 10 ms deglitching circuit provides fault-
blanking feature, preventing the OC_N pin to be asserted during hot-insertion or short
spikes of overcurrent conditions.
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. These power-distribution switches are
designed to current limit at 0.9 A.
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Block diagram ST2052
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2 Block diagram
Figure 1. Block diagram
Power switch
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ST2052 Pin connections
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3 Pin connections
Figure 2. Pin connections (top view)
Table 2. Pin functions
Pin Symbol Description
1 GND Ground
2 IN Input voltage
3 EN1 Enable input. Logic high turns on power switch IN-OUT1.
4 EN2 Enable input. Logic high turns on power switch IN-OUT2.
5 OC2 Overcurrent. Logic output active low IN-OUT2.
6 OUT2 Power switch output
7 OUT1 Power switch output
8 OC1 Overcurrent. Logic output active Low IN-OUT2.
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Electrical ratings ST2052
6/14 Doc ID 9994 Rev 4
4 Electrical ratings
4.1 Absolute maximum ratings
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.
4.2 Recommended operating conditions
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VIInput voltage range(1)
1. All voltages are referred to GND.
-0.3 to 6 V
VOOutput voltage range(1) -0.3 - (VI + 0.3) V
VIENX EN Input voltage range -0.3 to 6 V
IOContinuous output current Internally limited
ESD Electrostatic discharge 2 kV
TJJunction operating temperature -40 to 125 °C
Table 4. Recommended operating conditions
Symbol Parameter Min Typ Max Unit
VIInput voltage range(1)
1. All voltages are referred to GND.
2.7 5.5 V
VOOutput voltage range(1) 05.5V
IO Continuous output current (per switch) 0 500 mA
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ST2052 Electrical characteristics
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5 Electrical characteristics
VI = 5.5 V, IO = rated current, VIEN = VI, TJ = 25 °C, unless otherwise specified. (See Note 1
on page 8).
Table 5. Power switch electrical characteristics
Symbol Parameter Test conditions Min Typ Max Unit
RDS(on) Static drain-source
ON-state resistance
VI = 5 V IO = 0.5 A 80 100
mΩ
VI = 5 V IO = 0.5 A, TJ = 85 °C 90 120
VI = 5 V IO = 0.5 A, TJ =125 °C 100 135
VI = 3.3 V IO = 0.5 A 90 125
VI = 3.3 V IO = 0.5 A, TJ = 85 °C 110 145
VI = 3.3 V IO = 0.5 A, TJ = 125 °C 120 160
trOutput rise time VI = 5.5 V
RL = 10, CL = 1µF
2.5 ms
VI = 2.7 V 3
tfOutput fall time VI = 5.5 V 0.3 ms
VI = 2.7 V 0.2
Table 6. Enable Input ENx characteristics
Symbol Parameter Test conditions Min Typ Max Unit
VIH
High level input
voltage VI = 2.7 to 5.5 V 2 V
VIL
Low level input
voltage
VI = 4.5 to 5.5 V 0.8 V
VI = 2.7 to 4.5 V 0.4
IIInput current VIENX = 0 V or VI-0.5 0.5 μA
ton Turn-on time RL= 10 Ω, CL= 100 μF20ms
toff Turn-off time RL= 10 Ω, CL= 100 μF40ms
Table 7. Current limit characteristics
Symbol Parameter Test conditions Min Typ Max Unit
IOS
Short-circuit output
current
VI = 5 V, OUT connected to GND,
device enabled into short-circuit 0.7 1 1.3 A
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Electrical characteristics ST2052
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Note: 1 Pulse testing techniques maintain junction temperature close to ambient temperature:
thermal effect must be takes into account separately.
2 Specified by design, not production tested.
3 Guaranteed by design.
Table 8. Supply current characteristics
Symbol Parameter Test conditions Min Typ Max Unit
ISOL
Current low level
output
VIENX = VI, no load, 0.025 1
μA
VIENX = VI, no load,
TJ = -40 to 125 °C 10
ISOH
Current low high
output
VIENX = 0, no load, 70 90
μA
VIENX = 0, no load,
TJ = -40 to 125 °C 100
IL
Output leakage
current
VIENX = VI, output connected to
GND, TJ = -40 to 125 °C 10 μA
Table 9. Undervoltage characteristics
Symbol Parameter Test conditions Min Typ Max Unit
VIL
Low level input
voltage 22.5V
VHYS Hysteresis 100 mV
Table 10. Overcurrent (OC) characteristics
Symbol Parameter Test conditions Min Typ Max Unit
ISINK Sink current VO = 5 V 10 mA
VOOutput low voltage IO = 5 mA 0.5 V
IOFF OFF-state current VO = 5 V VO = 3.3 V 1 μA
TFB Fault-blanking period VI = 5.5 V, TJ = 25 °C
(See Note 2 and Note 3)210 ms
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ST2052 Electrical characteristics
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Figure 3. Test circuit
Figure 4. Waveform - propagation delays (f = 1 MHz; 50% duty cycle)
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Package mechanical data ST2052
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6 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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ST2052 Package mechanical data
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Figure 5. SO-8 package outline
Table 11. SO8 - mechanical data
Symbol
Millimeters inches
Min Typ Max Min Typ Max
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.004 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 0.15 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 8° (max.)
ddd 0.10 0.004
&
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Package mechanical data ST2052
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Figure 6. Tape and reel SO-8 package outline
Table 12. Tape and reel SO-8 mechanical data
Symbol
Millimeters inches
Min Typ Max Min Typ Max
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
A0 8.1 8.5 0.319 0.335
B0 5.5 5.9 0.216 0.232
K0 2.1 2.3 0.082 0.090
P0 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
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ST2052 Revision history
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7 Revision history
Table 13. Revision history
Date Revision Changes
13-Jul-2005 2 Add bullet on pag. 1, add paragraph in the description on pag. 1
and add row TFB on Table 10.
30-May-2007 3 Updated features in cover page, document reformatted
24-Nov-2010 4
Document reformatted, added “Not Recommended for New
Design” and Note 1 below Table 1, corrected typo in Features,
Section 1, Ta bl e 2 to Table 10 , title of Figure 4, updated Table 1,
Section 4.1, Section 5, ECOPACK® text in Section 6 and
Ta b le 1 1 .
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ST2052
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