ST2051BDR

ST2051 Enhanced power switch Not recommended for new design Features ■ 90 mΩ 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 u d o r P e SO-8 ■ 2.5 ms typical rise time ■ Undervoltage lock out ■ 10 μA maximum standby supply current ■ Ambient temperature range, 0 °C to 85 °C ■ 2 kV ESD protection ■ Fault-blanking Table 1. ) s ( ct Device summary od ST2051BDR(1) r P e ) (s t c u Order code t e l o s b O Package Packaging SO-8 Tape and reel 1. Not recommended for new design (refer to STMPS2151MTR). Contact ST sales office for availability. t e l o s b O November 2010 Doc ID 12593 Rev 3 This is information on a product still in production but not recommended for new designs. 1/10 www.st.com 10 Description 1 ST2051 Description 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 mΩ 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. ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 2/10 Doc ID 12593 Rev 3 ST2051 2 Schematic diagram and pin connections Schematic diagram and pin connections Figure 1. Schematic diagram 6). 6/54 #URRENT SENSE ) s ( ct u d o 4HERMAL SENSE &AULT BLANKINGREPORTING DRIVERCONTROLUNIT r P e t e l o #HARGE PUMP Figure 2. s b O !- Pin connections (top view) ) (s t c u d o r P e t e l o Table 2. O bs Pin functions Pin Name Type Description 1 GND - Ground 2 IN1 - VCC input, 2.7-5.5 V 3 IN2 - VCC input, 2.7-5.5 V 4 EN I Enable (active hi) 5 OC O Open drain output for fault indication 6 OUT3 - Output 7 OUT2 - Output 8 OUT1 - Output Doc ID 12593 Rev 3 3/10 Functional descriptions ST2051 3 Functional descriptions 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. 3.2 Overcurrent/overtemperature protection ) s ( ct u d o 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. 3.3 Undervoltage lock out (UVLO) t e l o r P e s b O When input voltage drops below critical value, the power switch turns OFF to prevent improper operation due to low voltage. ) (s t c u d o r P e t e l o s b O 4/10 Doc ID 12593 Rev 3 ST2051 4 Maximum rating 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. Absolute maximum ratings Symbol Parameter VI Input voltage range VO Output voltage range VIENX ESD Table 4. V uc od EN Input voltage range -0.3-6.0 r P e V V Internally limited let Junction operating temperature TSTG ) s ( t -0.3-(VI+0.3) ESD protection level TJ Unit -0.3-6.0 Continuous output current IO o s b Storage temperature 2 kV -40 to 125 °C -55 to 150 °C Recommended operating conditions Symbol -O Parameter (s) VI Input voltage VO Output voltage IO Continuous output current e t e ol Value ct du Min Typ Max Unit 2.7 5.0 5.5 V 0 5.0 5.5 V 0 - 500 mA o r P s b O Doc ID 12593 Rev 3 5/10 Electrical characteristics 5 ST2051 Electrical characteristics Table 5. Electrical characteristics (TJ = 25 °C, VI = 5.0 V) Symbol Parameter Test conditions Static drain-source RDS(on) on-state resistance tr tf Max VI = 3.3 V; -40 < TJ < 125 °C 100 145 VI = 5.0 V; -40 < TJ < 125 °C 90 135 VI = 3.3 V; TJ = 25 °C 90 130 VI = 5.0 V; TJ = 25 °C 80 VI = 2.7 V, RL = 10 Ω, CL = 1 μF ct ) s ( ct 110 u d o e t e ol Unit mΩ Pr s b O VI = 5.5 V, RL = 10 Ω, CL = 1 μF ) (s Output fall time(1) u d o Typ VI = 5.5 V, RL = 10 Ω, CL = 1 μF Output rise time(1) Min VI = 2.7 V, RL = 10 Ω, CL = 1 μF 2.5 ms 3 ms 0.3 ms 0.2 ms TON Turn-ON time(1) RL = 10 Ω, CL = 100 μF 20 ms TOFF Turn-OFF time(1) RL = 10 Ω, CL = 100 μF 40 ms r P e t e l o 1. Not tested in production, specified by design s b O Table 6. Symbol IOS 6/10 Current limit characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) Parameter Short-circuit output current Test conditions VI = 5 V, OUT connected to GND, device enabled into short-circuit Doc ID 12593 Rev 3 Min Typ Max Unit 0.7 1.0 1.3 A ST2051 Electrical characteristics Table 7. Supply current characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) Symbol Parameter Test conditions Min Typ Max Unit 1.0 5.0 μA 10 μA 90 μA No load; -40 < TJ < 125 °C 100 μA Output grounded, switch is OFF 10 μA Output leakage current Output grounded, switch is OFF; -40 < TJ < 125 °C 20 μA No load IOFF Switch turned OFF ION Switch turned ON No load; -40 < TJ < 125 °C No load Ileakage Table 8. Parameter Thermal shutdown threshold T2 Recovery from thermal shutdown VUVLO Hyst Table 10. OC blanking b O so s b O u d o Min Typ Max Pr Unit 135 °C 125 °C 10 °C UVLO characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) Parameter ) (s Test conditions Undervoltage lockout threshold Min u d o Typ 2.0 ct Hysteresis Max Unit 2.5 V 100 mV OC pin characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) r P e Symbol e t e ol Hysteresis Symbol let Test conditions T1 Table 9. ) s ( ct Thermal characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) Symbol Hyst 70 Parameter Test conditions OCx assertion and de-assertion(1) Min Typ Max Unit 4 8 15 ms VO Output low voltage 0.4 V IOFF OFF current 1.0 μA 1. Not tested in production, specified by design. Table 11. EN pin characteristics (VI = 5.5 V, IO = rated current, TJ = 25 °C, unless otherwise specified) Symbol Parameter VIH High level input voltage VIL Low level input voltage II Input current Test conditions VI = 2.7 to 5.5 V Min Typ Max 2.0 Unit V VI = 4.5 to 5.5 V 0.8 V VI = 2.7 to 4.5 V 0.4 V 0.5 μA VIENX = 0 or VI Doc ID 12593 Rev 3 -0.5 7/10 Package mechanical data 6 ST2051 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. Figure 3. SO-8 package outline ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 8/10 Doc ID 12593 Rev 3 ST2051 Revision history Table 12. SO-8 mechanical data Millimeters inches Symbol Min Typ Max 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 E 3.80 4.00 0.15 0.157 u d o 0.050 H 5.80 6.20 0.228 h 0.25 0.50 0.010 L 0.40 1.27 Table 13. 0.016 o s b 0.10 0.244 0.020 0.050 0.004 O ) s ( t c u d o Document revision history Pr Date r P e let 8° (max.) Revision history ) s ( ct 0.197 1.27 ddd Revision Changes 02-Aug-2006 1 Initial release. 26-Feb-2008 2 Document restructured and converted to new ST template, watermark removed. 3 Document reformatted, added “Not Recommended for New Design” and Note 1 below Table 1, corrected typo in Features, Description, Section 3, Section 4, Table 3, Table 5 to Table 11, updated ECOPACK® text inSection 6. e t e ol O Typ 1.35 k bs Min A e 7 Max 24-Nov-2010 Doc ID 12593 Rev 3 9/10 ST2051 ) s ( ct Please Read Carefully: u d o Information in this document is provided solely in connection with ST products. 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