ST2042
Enhanced power switch
Features
80m high-side MOSFET switch 500mA continuos current per channel Thermal and short-circuit protection with overcurrent logic output Operating range from 2.7V to 5.5V CMOS- and TTL-compatible enable inputs 10ms OC_N fault blanking 2.5ms typical rise time Under voltage lock out 10A maximum standby supply current Ambient temperature range, -40C to 85C Fault-blanking 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 10ms 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.
SO-8
Description
The ST2042 power distribution switches is intended for application where heavy capacitive loads and short circuits are likely to be encountered. These devices incorporate 80m. 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.
Table 1.
Device summary
Part number ST2042BD ST2042BDR Package SO-8 SO-8 Packaging Tube (50 parts per tube, 40 tube per box) Tape and reel (2500 parts per reel)
May 2007
Rev 5
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Contents
ST2042
Contents
1 2 3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 5 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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ST2042
Block diagram
1
Block diagram
Figure 1. Block diagram
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Pin connections
ST2042
2
Pin connections
Figure 2. Pin connections (top view)
Table 2.
Pin functions
Symbol GND IN EN1 EN2 O C2 OUT2 OUT1 O C1 Ground Input voltage Enable input. logic low turns On power switch IN-OUT1 Enable input. logic low turns On power switch IN-OUT2 Overcurrent. logic output Active low IN-OUT2 Power switch output Power switch output Overcurrent. logic output Active low IN-OUT2 Description
Pln N 1 2 3 4 5 6 7 8
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ST2042
Electrical ratings
3
3.1
Electrical ratings
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. Table 3.
Symbol VI VO VIENX IO ESD TJ
Absolute maximum ratings
Parameter Input voltage range (1) Output voltage range
(1)
Value -0.3 - 6 -0.3 - (VI + 0.3) -0.3 to 6 Internally Limited 2 -40 to 125
Unit V V V
EN Input voltage range Continuous output current Electrostatic discharge Junction Operating Temperature
kV C
1. All voltage are referred to GND
3.2
Recommended operating conditions
Table 4.
Symbol VI VO IO
Recommended operating conditions
Parameter Input voltage range (1) Output voltage range
(1)
Mi n 2.7 0 0
Typ
Max 5.5 5.5 500
Unit V V mA
Continuous output current (Per switch)
1. All voltage are referred to GND
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Electrical characteristics
ST2042
4
Electrical characteristics
VI = 5.5V, IO = rated current, VIEN = 0V, TJ = 25C, unless otherwise specified. (See Note 1) Table 5.
Symbol
Power switch electrical characteristics
Parameter VI = 5V VI = 5V Test conditions IO = 0.5A IO = 0.5A, TJ = 85C IO = 0.5A, TJ =125C Min Typ 80 90 100 90 110 120 2.5 ms 3 RL = 10, CL = 1F 0.3 ms 0.2 Max 100 120 135 m 125 145 160 Unit
RDS(on)
Static drain-source ON-state resistance
VI = 5V
VI = 3.3V IO = 0.5A VI = 3.3V IO = 0.5A, TJ = 85C VI = 3.3V IO = 0.5A, TJ = 125C
tr
Output rise time
VI = 5.5V VI = 2.7V
tf
Output fall time
VI = 5.5V VI = 2.7V
Table 6.
Symbol VIH VIL II ton toff
Enable Input ENx characteristics
Parameter High level input voltage Low level input voltage Input current Turn-on time Turn-off time Test conditions VI = 2.7V to 5.5V VI = 4.5V to 5.5V VI = 2.7V to 4.5V VIENX = 0V or VI RL= 10 CL=100F RL= 10 CL=100F -0.5 Min 2 0.8 V 0.4 0.5 20 40 A ms ms Typ Max Unit V
Table 7.
Symbol IOS
Current limit characteristics
Parameter Shor t circuit output current Test conditions VI = 5V, OUT connected to GND, device enabled into short circuit Min 0.7 Typ 1 Max 1.3 Unit A
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ST2042
Electrical characteristics
Table 8.
Symbol
Supply current characteristics
Parameter Current low level output Test conditions VIENX = VI, No Load, VIENX = VI, No Load, TJ=-40 to 125C VIENX = 0, No Load, VIENX = 0, No Load, TJ=-40 to 125C VIENX = VI, Output connected to GND, TJ=-40 to 125C 70 Min. Typ. 0.025 Max. 1 A 10 90 A 100 10 A Unit
ISOL
ISOH
Current low high output Output leakage current
IL
Table 9.
Symbol VIL VHYS
Undervoltage characteristics
Parameter Low level input voltage Hysteresis Test conditions Min. 2 100 Typ. Max. 2.5 Unit V mV
Table 10.
Symbol I SINK VO IOFF TFB
Overcurrent (OC) characteristics
Parameter Sink current Output low voltage OFF-state current Fault-blanking period VO = 5V IO = 5mA VO = 5V VO = 3.3V VI = 5.5V, TJ = 25C (See Note 2 and 3) 2 10 Test conditions Min. 10 0.5 1 Typ. Max. Unit mA V A ms
Note:
1 2 3
Pulse testing techniques maintain junction temperature close to ambient temperature: thermal effect must be takes into account separately. Specified by design, not production tested. Guaranteed by design.
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Electrical characteristics
ST2042
Figure 3.
Test circuit
Figure 4.
Waveform - propagation delays (f=1MHz; 50% duty cycle)
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ST2042
Package mechanical data
5
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
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Package mechanical data Table 11.
Dim. Min. A A1 A2 B C D E e H h L k ddd 0.10 5.80 0.25 0.40 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 8 (max.) Typ. Max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min. 0.053 0.004 0.043 0.013 0.007 0.189 0.15 0.050 Typ.
ST2042
SO-8 Mechanical data
mm. inch Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157
0.244 0.020 0.050
0.004
Figure 5.
Package dimensions
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ST2042
Revision history
6
Revision history
1 Table 12.
Date 13-Jul-2005 29-May-2007
Revision history
Revision 4 5 Changes Add bullet on pag. 1, add paragraph in the description on pag. 1 and add row TFB on Table 10. Updated features in cover page, document reformatted
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ST2042
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