ST2051
Enhanced power switch
Not recommended for new design
Features
■
■
■
■
■
■
■
■
■
■
■
90 m Ω high-side MOSFET switch
500 mA continuous current per channel
Thermal and short-circuit protection with overcurrent logic output
Operating range from 2.7 to 5.5 V
CMOS- and TTL-compatible enable inputs
2.5 ms typical rise time
Undervoltage lock out
10 μ A maximum standby supply current
Ambient temperature range, 0 °C to 85 °C
2 kV ESD protection
Fault-blanking
SO-8
Table 1.
Device summary
Order code
ST2051BDR
(1)
Package
SO-8
Packaging
Tape and reel
1.
Not recommended for new design (refer to STMPS2151MTR). Contact ST sales office for availability.
Obsolete Product(s) - Obsolete Product(s)
November 2010 Doc ID 12593 Rev 3
This is information on a product still in production but not recommended for new designs.
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10
Description
1 Description
ST2051
The ST2051 power distribution switch is intended for applications where heavy capacitive loads and short-circuits are likely to be encountered. These devices incorporate 90 m
Ω
N-channel MOSFET high-side power switches for power-distribution. The switch is controlled by a 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, the device limits the output current to a safe level by switching into a constant-current mode, pulling the overcurrent 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.
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ST2051
2
Schematic diagram and pin connections
Schematic diagram and pin connections
Figure 1.
Schematic diagram
6).
6/54
#URRENT
SENSE
4HERMAL
SENSE
&AULTBLANKINGREPORTING
DRIVERCONTROLUNIT
#HARGE
PUMP
!-
Figure 2.
Pin connections (top view)
Table 2.
Pin
Pin functions
Name Type Description
1 GND Ground
2
Obsolete Product(s) - Obsolete Product(s)
4
IN1
IN2
EN I
-
-
V
CC
input, 2.7-5.5 V
V
CC
input, 2.7-5.5 V
Enable (active hi)
5 OC O Open drain output for fault indication
6
7
8
OUT3
OUT2
OUT1
-
-
-
Output
Output
Output
Doc ID 12593 Rev 3 3/10
Functional descriptions ST2051
3.1 Fault-blanking
ST 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 (typical) will not cause a FAULT output assertion. Only current-limit faults are blanked.
Die overtemperature faults and input voltage drops below the undervoltage lock out (UVLO) threshold will cause an immediate fault output.
3.3
In overcurrent or short-circuit condition, the switch limits the current at 500 mA.
If temperature of die goes above limit value, the switch turns OFF.
Undervoltage lock out (UVLO)
When input voltage drops below critical value, the power switch turns OFF to prevent improper operation due to low voltage.
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ST2051 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 3.
Symbol
Absolute maximum ratings
Parameter
V
I
V
O
V
IENX
I
O
ESD
T
J
T
STG
Table 4.
Symbol
V
I
V
O
I
O
Input voltage range
Output voltage range
EN Input voltage range
Continuous output current
ESD protection level
Junction operating temperature
Storage temperature
Recommended operating conditions
Parameter
Input voltage
Output voltage
Continuous output current
Min
2.7
0
0
Value
-0.3-6.0
-0.3-(V
I
+0.3)
-0.3-6.0
Internally limited
2
-40 to 125
-55 to 150
Typ
5.0
5.0
-
Max
5.5
5.5
500
Unit
V
V
V kV
°C
°C
Unit
V
V mA
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Electrical characteristics ST2051
Table 5.
Symbol
Electrical characteristics (T
J
= 25 °C, V
I
= 5.0 V)
Parameter Test conditions Min Typ Max Unit
R
DS(on)
T
T t t r f
ON
OFF
Static drain-source on-state resistance
Output rise time
Output fall time
Turn-ON time
(1)
Turn-OFF time
(1)
(1)
(1)
V
I
= 3.3 V;
-40 < T
J
< 125 °C
V
I
= 5.0 V;
-40 < T
J
< 125 °C
V
I
= 3.3 V;
T
J
= 25 °C
V
I
= 5.0 V;
T
J
= 25 °C
V
I
= 5.5 V,
R
L
= 10 Ω,
C
L
= 1 μ F
V
I
= 2.7 V,
R
L
= 10 Ω,
C
L
= 1 μ F
V
I
= 5.5 V,
R
L
= 10 Ω,
C
L
= 1 μ F
V
I
= 2.7 V,
R
L
= 10 Ω,
C
L
= 1 μ F
R
L
= 10
Ω,
C
L
= 100
μ
F
R
L
= 10
Ω
,
C
L
= 100
μ
F
1.
Not tested in production, specified by design
100 145
90
90
80
2.5
3
0.3
0.2
135
130
110
20
40 m Ω ms ms ms ms ms ms
Table 6.
Current limit characteristics
(V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Symbol Parameter Test conditions Min Typ Max Unit
Obsolete Product(s) - Obsolete Product(s)
I
OS
Short-circuit output current
GND, device enabled into short-circuit
0.7
1.0
1.3
A
6/10 Doc ID 12593 Rev 3
ST2051 Electrical characteristics
Table 7.
Symbol
I
OFF
I
ON
I leakage
Supply current characteristics
(V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Parameter Test conditions Min Typ Max Unit
No load
Switch turned OFF
No load; -40 < T
J
< 125 °C
No load
Switch turned ON
No load; -40 < T
J
< 125 °C
Output grounded, switch is OFF
Output leakage current
Output grounded, switch is OFF;
-40 < T
J
< 125 °C
1.0
70
5.0
10
90
100
10
20
μ
A
μ
A
μ
A
μ
A
μ
A
μ
A
Table 8.
Symbol
Thermal characteristics
(V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Parameter Test conditions Min Typ Max Unit
T1
T2
Hyst
Thermal shutdown threshold
Recovery from thermal shutdown
Hysteresis
135
125
10
°C
°C
°C
Table 9.
UVLO characteristics
(V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Parameter Test conditions Min Typ Max Unit Symbol
V
UVLO
Hyst
Undervoltage lockout threshold
Hysteresis
2.0
100
2.5
V mV
Table 10.
OC pin characteristics
(V
I
= 5.5 V, I
O
= rated current, T
J
= 25 °C, unless otherwise specified)
Symbol Parameter Test conditions Min Typ Max Unit
OC blanking
OCx assertion and de-assertion
V
O
I
OFF
Output low voltage
OFF current
1.
Not tested in production, specified by design.
(1)
4 8 15
0.4
1.0
ms
V
μ
A
Table 11.
EN pin characteristics Obsolete Product(s) - Obsolete Product(s)
Symbol Parameter Test conditions Min Typ Max Unit
V
IH
V
IL
High level input voltage
Low level input voltage
Input current
V
I
= 2.7 to 5.5 V
V
I
= 4.5 to 5.5 V
V
I
= 2.7 to 4.5 V
V
IENX
= 0 or V
I
2.0
-0.5
I
I
0.8
0.4
0.5
V
V
V
μ
A
Doc ID 12593 Rev 3 7/10
Package mechanical data ST2051
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.
Figure 3.
SO-8 package outline
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ST2051 Revision history
Table 12.
SO-8 mechanical data
Millimeters inches
Symbol
Min Typ Max Min Typ Max
A 1.35
A1 0.10
A2 1.10
B 0.33
C 0.19
D 4.80
E 3.80 e 1.27
H 5.80 h 0.25
L 0.40
0.069
0.010
0.065
0.020
0.010
0.197
0.157
0.050
0.244
0.020
0.050 ddd 0.10 0.004
Table 13.
Document revision history
Date Revision Changes
02-Aug-2006 1 Initial release.
26-Feb-2008 2
Document restructured and converted to new ST template, watermark removed.
Document reformatted, added “Not Recommended for New
Design” and
Note 1 below Table 1 , corrected typo in Features
,
24-Nov-2010 3
Description
, Section 3
,
Section 4 , Table 3 ,
Table 5
to Table 11
, updated ECOPACK
®
text in
Section 6 .
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Doc ID 12593 Rev 3 9/10
ST2051
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