TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 TPS2358 Dual-Slot ATCA AdvancedMC™ Controller FEATURES 1 DESCRIPTION • ATCA AdvancedMC™ Compliant • Full Power Control for Two AdvancedMC™Modules • Independent 12-V Current Limit and Fast Trip • 12-V FET ORing for MicroTCA™ • Internal 3.3-V Current Limit • Power Good and Fault Outputs • 48-Pin PQFN Package 2 The TPS2358 dual-slot hot-plug controller provides all required power interface functions for two AdvancedMC™ (Advanced Mezzanine Card) modules. Two fully integrated 3.3-V channels provide inrush control, current limiting, and overload protection. The two 12-V channels use an external FET to provide the same functions, along with ORing control circuits that allow an external FET to prevent reverse current flow. The 3.3-V current limits are factory set to AdvancedMC™ compliant levels and the 12-V current limits are programmed using external sense resistors. The accurate current sense comparators of the TPS2358 satisfy the narrow ATCA AdvancedMC™ current limit requirements. APPLICATIONS • • • • • ATCA Carrier Boards MicroTCA™ Power Modules AdvancedMC™ Slots Systems Using 12 V and 3.3 V Base Stations TYPICAL APPLICATION DIAGRAM 12 V in 3v3 in 12 V in IN12A SENPA EN12A\ EN3A\ ORENA\ CT12A CT3A IN3A VDD3A VINT GND AGND EN12B\ EN3B\ ORENB\ CT12B CT3B IN3B RSET VDD3B IN12B SENPB 3v3 in COMMON CIRCUITRY RSET SETB SETA RSENSE SENMB SENMA 48 PIN QFN PASSB PASSA BLKB BLKA SUM12A SUM3A PG12A\ PG3A\ RSUM3A 12 V AdvancedMC™ FLT12A\ RSUM3B FLT3A\ AGND GNDA GNDB PG12B\ PG3B\ FLT12B\ FLT3B\ RSUM12B SUM3B OUT3B SUM12B OUT12B 3.3 V RSENSE TPS2358 OUT12A OUT3A RSUM12A 3.3 V COMMON CIRCUITRY 12 V AdvancedMC™ Optional ORing FETs for Redundant Systems Only 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. AdvancedMC, MicroTCA are trademarks of PICMG. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008, Texas Instruments Incorporated TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com ORDERING INFORMATION (1) (1) (2) DEVICE TEMPERATURE PACKAGE (2) ORDERING CODE TPS2358 -40°C to 85°C QFN48 TPS2358RGZ Add an R suffix to the device type for tape and reel. For the most current package and ordering information see the Package Option Addendum at the end of this document or see the TI Web site at www.ti.com. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) PARAMETER VALUE PASSx, BLKx 0 to 30 IN12x, OUT12x, SENPx, SENMx, SETx, EN12x, FLTx, PGx, ORENx 0 to 17 IN3x, OUT3x, EN3x, VDDx, CTx, SUMx 0 to 5 AGND, GNDx V –0.3 to 0.3 FLTx, PGx 5 SUMx 5 VINT –1 to 1 OUT3x (1) Unit mA Internally limited Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only. Functional operation of the device under any conditions beyond those indicated under recommended operating conditions is neither implied nor guaranteed. Exposure to absolute maximum rated conditions for extended periods of time may affect device reliability. ELECTROSTATIC DISCHARGE (ESD) PROTECTION TEST METHOD MIN Human Body Model (HBM) 2 Charged Device Model (CDM) 0.5 UNITS kV DISSIPATION RATINGS PACKAGE θJA - High-k (°C/W) QFN48 - RGZ 29.1 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PARAMETER MIN TYP MAX UNITS VIN12x 12-V input supply 8.5 12 15 VIN3x 3.3-V input supply 3 3.3 4 VVDD3x 3.3-V input supply 3 3.3 4 IOUT3x 3.3-V output current ISUMx Summing pin current 100 1000 165 PASSx pin board leakage current -1 VINT bypass capacitance TJ 2 1 Operating junction temperature range –40 Submit Documentation Feedback 1 10 V mA µA 250 nF 125 °C Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 ELECTRICAL CHARACTERISTICS IN3A = IN3B = VDD3A = VDD3B = 3.3 V. IN12A = IN12B = SENPA = SENPB = SENMA = SENMB = SETPA = SETPB = 12 V. EN12A = EN12B = EN3A = EN3B = ORENA = ORENB = CT12A = CT12B = CT3A = CT3B = AGND = GNDA = GNDB = 0 V. SUM12A = SUM12B = 6.8 kΩ to ground. SUM3A = SUM3B = 3.3 kΩ to ground. All other pins open. Over free air temperature operating range and all voltages referenced to AGND, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS ENABLE Inputs Threshold voltage, falling edge Hysteresis (1) 1.2 1.3 1.4 V 20 50 80 mV 5 Pullup current ENx = ORENx = 0 V 8 15 Input bias current EN12x = ORENx = 17 V 6 15 Input bias current EN3x = 5 V 1 5 3.3-V turn off time EN3x deasserts to VOUT3x < 1.0 V, COUT = 0 µF 10 12-V turn off time EN12x deasserts to VOUT12x < 1.0 V, COUT = 0 µF, QGATE = 35 nF 20 µA µs POWER GOOD Outputs Low voltage Sinking 2 mA Leakage current PGx = 17 V Threshold voltage PG12x, falling VOUT12x 0.14 PG3x, falling VOUT3x Hysteresis (1) µA 10.5 10.8 2.7 2.8 2.9 PG12x, measured at OUT12x PGx falling V 1 10.2 130 PG3x, measured at OUT3x Deglitch time (1) 0.25 mV 50 50 V µs 100 150 0.14 0.25 V 1 µA V FAULT Outputs Low voltage Sinking 2 mA Leakage current PGx = 17 V VINT Output voltage 0 < IVINT < 50 µA 2 2.3 2.8 –7 –10 –13 7 10 13 Upper threshold voltage 1.3 1.35 1.4 Lower threshold voltage 0.33 0.35 0.37 Fault Timer Sourcing current VCTx = 0 V, during fault Sinking current VCTx = 2 V µA V 12-V Summing Node Input referred offset VSENMx = 10.8 – 13.2 V, VSENPx = VSENMx + 50 mV, measure VSETx – VSENMx Summing threshold VPASSx = 15 V Leakage current VSETx = VSENMx – 10 mV –2 0.66 2 0.675 mV 0.69 V 1 µA 52.5 mV 40 µA 100 120 mV 200 300 ns 6 7 V 12-V Current Limit Current limit threshold RSUMx = 6.8 kΩ, RSETx = 422 Ω, increase ILOADx and measure VSENPx – VSENMx when VPASSx = 15 V Sink current in current limit VSUMx = 1 V, VPASSx = 12 V, measure IPASSx 20 Fast trip threshold Measure VSENPx – VSENMx 80 Fast turn-off delay (1) 20 mV overdrive, CPASSx = 0 pF, tp50-50 Timer start threshold VPASSx - VINx when timer starts, while VPASSx falling due to over current (1) 47.5 5 50 Not production tested. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 3 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS (continued) IN3A = IN3B = VDD3A = VDD3B = 3.3 V. IN12A = IN12B = SENPA = SENPB = SENMA = SENMB = SETPA = SETPB = 12 V. EN12A = EN12B = EN3A = EN3B = ORENA = ORENB = CT12A = CT12B = CT3A = CT3B = AGND = GNDA = GNDB = 0 V. SUM12A = SUM12B = 6.8 kΩ to ground. SUM3A = SUM3B = 3.3 kΩ to ground. All other pins open. Over free air temperature operating range and all voltages referenced to AGND, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS 12-V UVLO UVLO rising IN12x rising 8.1 8.5 8.9 UVLO hysteresis (2) IN12x falling 0.44 0.5 0.59 V 12-V BLOCKING Turn-on threshold Measure VSENPx – VOUTx 5 10 15 Turn-off threshold Measure VSENPx – VOUTx –5 –3 0 Turn-off delay (2) 20 mV overdrive, CBLKx = 0 pF, tp50-50 200 300 mV ns 12-V Gate Drivers ( PASSx, BLKx ) Output voltage VINx = VOUTx = 10 V 21.5 23 24.5 V Sourcing current VIN12x = VOUT12x = 10 V, VPASSx = VBLKx = 17 V 20 30 40 µA Fast turnoff, VPASSx = VBLKx = 14 V 0.5 1 Sustained, VPASSx = VBLKx = 4 – 25 V 10 14 20 mA In OTSD ( at 150 °C ) 14 20 26 kΩ 5 10 15 µs Sinking current Pulldown resistance Fast turn-off duration (2) Disable delay (2) Startup time (2) A 1 µs 0.25 ms 675 695 mV mΩ EN12x pin to PASSx and BLKx, tp50-90 IN12x rising to PASSx and BLKx sourcing 3.3-V Summing Node Summing threshold 655 3.3-V Current Limit On resistance IOUT3x = 150 mA Current limit RSUM3x = 3.3 kΩ , VOUT3x = 0 V Fast trip threshold Fast turn-off delay (2) 290 500 170 195 225 250 300 400 750 1300 IOUT3x = 400 mA, tp50-50 mA ns 3.3-V UVLO UVLO rising IN3x rising 2.65 2.75 2.85 V UVLO hysteresis (2) IN3x falling 200 240 300 mV 3.1 4 2 2.8 Supply Currents (IINx + ISENPx + ISENMx + ISETx + IVDDx) All channels enabled IOUT3A = IOUT3B = 0 All channels disabled mA Thermal Shutdown Whole-chip shutdown temperature (2) TJ rising, IOUT3A = IOUT3B = 0 140 150 3.3 V channel shutdown temperature (2) TJ rising, IOUT3A or IOUT3B in current limit 130 140 Hysteresis (2) Whole chip or 3.3-V channel (2) 4 °C 10 Not production tested. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 DEVICE INFORMATION SIGNAL AND PIN NAMING BLOCK The PICMG™ AdvancedMC™ specification refers to 3.3-V power as management power and refers to 12-V power as payload power. This datasheet uses a naming convention that reflects the associated voltage (12 V to 3 V) and AdvancedMC™ slot (A or B). • Signals and pins associated with slot A 12-V payload power end with 12A. • Signals and pins associated with slot A 3.3-V management power end with 3A. • Signals and pins associated with slot B 12-V payload power end with 12B. • Signals and pins associated with slot B 3.3-V management power end with 3B. Pins and signals unique to 12-V channels have only an A or B suffix. TPS2358 Block Diagrams RSENSE RSET IN12x SENPx SETx SENMx PASSx BLKx OUT12x pgat\ + 30 uA 30 uA ogat + Vcp ~25 v CT 12dis 100 mv Q Pump 10 us 10 us Fault Timer FLT12x\ Vcp CT12x EN12x\ 6810 ! vthoc - 675 mv nominal SUM12x + RSUM PG12x\ 10 mv vpg + -3 mv OUT12x + R Q S Q + ogat 100 us OUT pgat\ oren Figure 1. 12-V Channel Circuitry Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 5 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com 0.1 W IN3x OUT3x 2.8 V 245 W + gat VDD3x en\ PG3x\ 30mv 30 us + Q Pump 30 uA + vcpx ~25 v 12dis Fault Timer vcpx CT3x FLT3x \ 30 us SUM3x vthoc - [ 675 mv nominal ] 3300 + RSUM en\ EN3x\ 10mv + -3mv OUT3x R Q S Q gat + Figure 2. 3-V Channel Circuitry IN12A IN12B IN3A IN3B OUT12A OUT12B OUT3A OUT3B VINT Selector por en PREREG POR Trim NVM 2.2V AGND GNDA GNDB Figure 3. Circuitry Common to all Channels 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 CT12A FLT12A BLKA OUT12A GNDA EN12A PASSA EN12B EN3A EN3B VDD3A IN3A Control 48 47 46 45 44 43 42 41 40 39 38 37 IN12A 1 36 OUT3A SENPA 2 35 CT3A SETA 3 34 FLT3A SENMA 4 33 PG3A VINT 5 32 SUM3A PG12A 6 31 AGND SUM12A 7 30 VDD3B ORENA 8 29 SUM3B GND 9 28 PG3B GND 10 27 FLT3B PG12B 11 26 CT3B SUM12B 12 25 OUT3B 17 18 19 20 21 OUT12B GNDB ORENB PASSB SENMB SETB CT12B 12A, 12B 22 23 24 IN3B 16 IN12B 15 SENPB 14 BLKB 13 FLT12B 48 Pin QFN 3A, 3B TERMINAL FUNCTIONS PIN# NAME TYPE DESCRIPTION 1 IN12A VDD 2 SENPA I 12A input sense 3 SETA I 12A current limit set 4 SENMA I 12A current limit sense 5 VINT I/O Bypass capacitor connection point for internal supply 6 PG12A O 12A power good output, active low, asserts when OUT12A > VPG12A 7 SUM12A I/O 12A summing node 8 ORENA I 9 GND GND Connect pin to ground 10 GND GND Connect pin to ground 12A input 12A blocking transistor enable, active low 11 PG12B O 12B power good output, active low, asserts when OUT12B > VPG12B 12 SUM12B I/O 12B summing node Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 7 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com TERMINAL FUNCTIONS (continued) PIN# 8 NAME TYPE DESCRIPTION 13 CT12B I/O 12B fault timing capacitor 14 FLT12B O 12B fault output, active low, asserted when 12B fault timer runs out 15 BLKB O 12B blocking transistor gate drive 16 OUT12B I/O 12B output 17 GNDB GND 18 ORENB I 12B blocking transistor enable, active low 19 PASSB O 12B pass transistor gate drive 20 SENMB I 12B current limit sense 21 SETB I 12B current limit set 22 SENPB I 12B input sense 23 IN12B VDD 12B input 24 IN3B VDD 3B input 25 OUT3B I/O 3B output 26 CT3B I/O 3B fault timing capacitor 27 FLT3B O 3B fault output, active low, asserted when 3B fault timer runs out 28 PG3B O 3B power good output, active low, asserts when OUT3B > 2.8 V 29 SUM3B I/O 3B summing node 30 VDD3B VDD 3B charge pump input 31 AGND GND Analog ground 32 SUM3A I/O 3A summing node 33 PG3A O 3A power good output, active low, asserts when OUT3A > 2.8 V 34 FLT3A O 3A fault output, active low, asserted when 3A fault timer runs out 35 CT3A I/O 3A fault timing capacitor 36 OUT3A I/O 3A output 37 IN3A VDD 3A input 38 VDD3A VDD 3A charge pump input 39 EN3B I 3B enable, (default active low) 40 EN3A I 3A enable, (default active low) 41 EN12B I 12B enable, (default active low) 42 PASSA O 12A pass transistor gate drive 43 EN12A I 12A enable, (default active low) 44 GNDA GND 45 OUT12A I/O 12A output 12B power ground 12A power ground 46 BLKA O 12A blocking transistor gate drive 47 FLT12A I/O 12A fault output, active low, asserted when 12A fault timer runs out 48 CT12A I/O 12A fault timing capacitor Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 DEVICE INFORMATION DETAILED PIN DESCRIPTION AGND Ground pin for the analog circuitry inside the TPS2358. BLKx Gate drive pin for the 12x channel BLK FET. This pin sources 30 µA to turn the FET on. An internal clamp prevents this pin from rising more than 14.5 V above OUT12x. Setting the ORENx pin high holds the BLKx pin low. CTx A capacitor from CTx to GND sets the time the channel can remain in current limit before it shuts down and declares a fault. Current limit causes this pin to source 10 µA into the external capacitor (CT). When VCTx reaches 1.35 V, the TPS2358 shuts the channel off by pulling the PASSx pin low and declares an over-current fault by pulling the FLTx pin low. EN12x Active low enable input. Pulling this pin high (or allowing it to float high) turns off channel 12x by pulling both BLKx and PASSx low. An internal 200-kΩ resistor pulls this pin up to VINT when disconnected. EN3x Active low enable input. Pulling this pin high (or allowing it to float high) turns off channel 3x by pulling the gate of the internal pass FET to GND. An internal 200-kΩ resistor pulls this pin up to VINT when disconnected. FLTx Active low open-drain output indicating that channel x has remained in current limit long enough to time out the fault timer and shut the channel down. IN12x Supply pin for channel 12x internal circuitry. IN3x Supply pin for channel 3x internal pass FET. ORENx Active low input. Pulling this pin low allows the 12x channel ORing function to operate normally. Pulling this pin high (or allowing it to float high) disables the ORing function by pulling the BLKx pin low. An internal 200-kΩ resistor pulls this pin up to VINT when disconnected. OUT12x Senses the output voltage of the channel 12x path. OUT3x Output of the channel 3x internal pass FET. PASSx Gate drive pin for the 12x channel pass FET. This pin sources 30 µA to turn the FET on. An internal clamp prevents this pin from rising more than 14.5 V above IN12x. PGx Active low open-drain output indicating that channel x output voltage has dropped below the PG threshold, which nominally equals 2.85 V for the 3x channels and 10.5 V for the 12x channels. SENMx Senses the voltage on the low side of the channel 12x current sense resistor. SENPx Senses the voltage on the high side of the channel 12x current sense resistor. SETx A resistor connected from this pin to SENPx sets the current limit level in conjunction with the current sense resistor and the resistor connected to the SUM12x pin, as described in 12-V thresholds – setting current limit and fast over current trip section. SUMx A resistor connected from this pin to ground forms part of the channel x current limit. As the current delivered to the load increases, so does the voltage on this pin. When the voltage on this pin reaches a threshold of 675 mV, the current limit amplifier acts to prevent the current from further increasing. VDD3x Supply pin for channel3x internal circuitry. VINT This pin connects to the internal 2.35-V rail. A 0.1-µF capacitor must be connected from this pin to ground. Do not connect other external circuitry to this pin. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 9 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS IDD at 25°C vs 12-V VDD 3-V CHANNEL ORING TURN-ON THRESHOLD 12 2.45 2.40 11 IDD - mA mV 2.35 10 9 2.30 2.25 2.20 2.15 8 -50 0 50 100 2.10 150 -50 TJ - Temperature - °C 0 50 100 150 VDD - 25°C Figure 4. Figure 5. 3-V CHANNEL ORING TURN-OFF THRESHOLD 12-V CURRENT LIMIT THRESHOLD 51.0 -1.0 50.8 -2.0 50.6 mV mV 0.0 -3.0 50.4 -4.0 50.2 50.0 -5.0 -50 0 50 100 150 -50 TJ - Temperature - °C 50 100 150 TJ - Temperature - °C Figure 6. 10 0 Figure 7. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 TYPICAL CHARACTERISTICS (continued) 3-V IDD vs TEMPERATURE 12-V CHANNEL ORING TURN-OFF THRESHOLD 0.0 0.26 -1.0 0.25 -2.0 mV IDD - mA 0.24 0.23 -3.0 0.22 -4.0 0.21 -5.0 0.20 -50 -50 50 0 100 0 150 50 100 150 TJ - Temperature - °C TJ - Temperature - °C Figure 8. Figure 9. 12-V CURRENT (mA) vs TEMPERATURE 12-V CHANNEL ORING TURN-ON THRESHOLD 12.0 2.4 11.5 11.0 2.3 mV Current - mA 10.5 10.0 2.2 6 9.5 9.0 2.1 8.5 8.0 2.0 -50 -50 0 50 100 150 TJ - Temperature - °C Figure 10. 0 50 100 150 TJ - Temperature - °C Figure 11. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 11 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) Figure 12. OUT3A Startup Into 22-Ω ( 150 mA ) 150-µF Load Figure 13. OUT3A Load Stepped from 165 mA to 240 mA 12 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 TYPICAL CHARACTERISTICS (continued) Figure 14. OUT3A Short Circuit under Full Load (165 mA) Zoom View Figure 15. OUT3A Short Circuit Under Full Load (165 mA) Wide View Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 13 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) Figure 16. OUT3A Startup Into Short Circuit Figure 17. OUT12A Startup Into 500-Ω, 830-µF Load 14 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 TYPICAL CHARACTERISTICS (continued) Figure 18. OUT12A Startup Into 80-Watt, 830-µF Load Figure 19. OUT12A Short Circuit Under Full Load (6.7 A) Wide View Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 15 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) Figure 20. OUT12A Short Circuit Under Full Load (6.7 A) Zoom View Figure 21. OUT12A Startup Into Short Circuit 16 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 TYPICAL CHARACTERISTICS (continued) Figure 22. OUT12A Overloaded While Supplying 6.7 A Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 17 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com REFERENCE INFORMATION The TPS2358 has been designed to simplify compliance with the PICMG-AMC.R2.0 and PICMG-MTCA.0 specifications. These specifications were developed by the PCI Industrial Computer Manufacturers Group (PICMG). These two specifications are derivations of the PICMG-ATCA (Advanced Telecommunication Computing Architecture) specification originally released in December, 2002. PICMG-AMC Highlights • • • • • • • • • AMC – Advanced Mezzanine Cards Designed to Plug Into ATCA Carrier Boards AdvancedMC™ Focuses on Low Cost 1 to 8 AdvancedMC™ per ATCA Carrier Board 3.3-V Management Power (maximum current draw of 150 mA) 12-V Payload Power – (converted to required voltages on AMC) Maximum 80-W Dissipation per AdvancedMC™ Hotswap and Current Limiting Must be Present on Carrier Board For Details,See www.picmg.org/v2internal/AdvancedMC.htm PICMG-MTCA Highlights • • • • • • • 18 MTCA - MicroTelecommunications Computing Architecture Architecture for Using AMCs Without an ATCA Carrier Board Up to 12 AMCs Per System, Plus Two MCHs and Two CUs Focuses on Low Cost All Functions of ATCA Carrier Board Must be Provided MicroTCA is Also Known as MTCA, mTCA, or uTCA For Details, See www.picmg.org/v2internal/microTCA.htm Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 SYSTEM OPERATION Introduction The TPS2358 controls two 12-V power paths and two 3.3-V power paths. Each power path can draw from a single common supply, or from two independent supplies. The TPS2358 is in a 48-pin QFN package. The following sections describe the main functions of the TPS2358 and provide guidance for designing systems around this device. Control Logic and Power-On Reset The TPS2358's circuitry draws power from an internal bus fed by a preregulator. A capacitor attached to the VINT pin provides decoupling and output filtering for this preregulator. It can draw power from any of four inputs (IN12A, IN12B, IN3A, or IN3B) or from any of four outputs (OUT12A, OUT12B, OUT3A, or OUT3B). This feature allows the internal circuitry to function regardless of which channels receive power, or from what source. The four external FET drive pins (PASSA, PASSB, BLKA, and BLKB) are held low during startup to ensure that the two 12-V channels remain off. The internal 3.3-V channels are also held off. When the voltage on the internal VINT rail exceeds approximately 1 V, the power-on reset circuit initializes the TPS2358. Enable Functions The TPS2358 provides three external enable pins for each of its two AdvancedMC™ slots. Pulling the EN3x low turns on the 3x channel. Pulling the EN12x pin turns on the 12x channel. If the EN12x pin goes high, the TPS2358 pulls both the PASSx and BLKx pins to ground. Pulling the ORENx pin low turns on the reverse blocking circuitry in the 12x channel. If the ORENx pin goes high, then the BLKx pin remains low. Each of the six enable pins has an internal 200-kΩ pullup resistor to VINT. Power Good (PG) Outputs The TPS2358 provides four active-low open-drain outputs that monitor the status of the four output voltage rails. The power good output for each channel pulls low whenever the voltage on its OUTx pin exceeds the PG threshold. The 3.3-V channels have nominal thresholds of 2.85 V and the 12-V channels have nominal thresholds of 10.5 V. Fault (FLT) Outputs The TPS2358 provides four active-low, open-drain fault outputs, one for each channel. A fault output pulls low when the channel has remained in current limit long enough to run out the fault timer. A channel experiencing a fault condition automatically shuts down. To clear the fault and re-enable the channel, turn the channel off and back on using the appropriate ENx pin. Current Limit and Fast Trip Thresholds All four channels monitor current by sensing the voltage across a resistor. The 3.3-V channels use internal sense resistors with a nominal value of 290 mΩ. The 12-V channels use external sense resistors that typically lie in the range of 4 - 10 mΩ. Each channel features two distinct thresholds: a current limit threshold and a fast trip threshold. The current limit threshold sets the regulation point of a feedback loop. If the current flowing through the channel exceeds the current limit threshold, then this feedback loop reduces the gate-to-source voltage imposed on the pass FET. This causes the current flowing through the channel to settle to the value determined by the current limit threshold. For example, when a module first powers up, it draws an inrush current to charge its load capacitance. The current limit feedback loop ensures that this inrush current does not exceed the current limit threshold. The current limit feedback loop has a finite response time. Serious faults such as shorted loads require a faster response in order to prevent damage to the pass FETs or voltage sags on the supply rails. A comparator monitors the current flowing through the sense resistor, and if it ever exceeds the fast trip threshold, then it immediately shuts off the channel. The channel turns back on slowly, allowing the current limit feedback loop time to respond. One normally sets the fast trip threshold some 2 to 5 times higher than the current limit. Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 19 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com 3.3-V Current Limiting The 3.3-V management power channels include internal pass FETs and current sense resistors. The on-resistance of a management channel - including pass FET, sense resistor, metallization resistance, and bond wires - typically equals 290 mΩ and never exceeds 500 mΩ. The AdvancedMC™ specification allows a total of 1 Ω between the power source and the load. The TPS2358 never consumes more than half of this budget. 3.3-V Fast Trip Function The 3.3-V fast trip function protects the channel against short-circuit events. If the current through the channel exceeds a nominal value of 300 mA, then the TPS2358 immediately disables the internal pass transistor and then allows it to slowly turn back on into current limiting. 3.3-V Current Limit Function The 3.3-V current limit function internally limits the current to comply with the AdvancedMC™ and MicroTCA™ specifications. External resistor RSUM3x allows the user to adjust the current limit threshold. The nominal current limit threshold ILIMIT equals: I LIMIT = 650V RSUM 3 x (1) A 3320-Ω resistor gives a nominal current limit of ILIMIT = 195 mA which complies with AdvancedMC™ and MicroTCA™ specifications. This resistance corresponds to an EIA 1% value. Alternatively, a 3.3-kΩ resistor will also suffice. Whenever a 3.3-V channel enters current limit, its fault timer begins to operate (see Fault Timer Programming section). 3.3-V Over-Temperature Shutdown The 3.3-V over-temperature shutdown trips if a 3.3-V channel remains in current limit so long that the die temperature exceeds approximately 140°C. When this occurs, any 3.3-V channel operating in current limit turns off until the chip cools by approximately 10°C. This feature prevents a prolonged fault on one 3.3-V channel from disabling the other 3.3-V channel, or disabling either of the 12-V channels. 20 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 12-V Fast Trip and Current Limiting Figure 23 shows a simplified block diagram of the circuitry associated with the fast trip and current limit circuitry within a 12-V channel. Each 12-V channel requires an external N-channel pass FET and three external resistors. These resistors allow the user to independently set the fast trip threshold and the current limit threshold, as described below. 12-V Fast Trip Function The 12-V fast trip function is designed to protect the channel against short-circuit events. If the voltage across RSENSE exceeds a nominal threshold of 100 mV, the device immediately disables the pass transistor and declares a fault condition. The nominal fast current limit equals: I FT = 100mV RS (2) 12-V Current Limit Function The 12-V current limit function regulates the PASSx pin voltage to prevent the current through the channel from exceeding ILIMIT. The current limit circuitry includes two amplifiers, A1 and A2, as shown in Figure 23. Amplifier A1 forces the voltage across external resistor RSET to equal the voltage across external resistor RSENSE. The current that flows through RSET also flows through external resistor RSUM, generating a voltage on the 12SUMx pin equal to: æR R V12 SUMx = ç SENSE SUM RSET è ö ÷ I SENSE ø (3) Amplifier A2 senses the voltage on the 12SUMx pin. As long as this voltage is less than the reference voltage on its positive input (nominally 0.675 V), the amplifier sources current to PASSx. When the voltage on the 12SUMx pin exceeds the reference voltage, amplifier A2 begins to sink current from PASSx. The gate-to-source voltage of pass FET MPASS drops until the the voltages on the two inputs of amplifier A2 balance. The current flowing through the channel then nominally equals: æ ö RSET I LIMIT = ç ÷ × 0.675V è RSUM RSENSE ø (4) Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 21 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com The recommended value of RSUM is 6810 Ω. This resistor should never equal less than 675 Ω to prevent excessive currents from flowing through the internal circuitry. Using the recommended values of RSENSE = 5 mΩ and RSUM = 6810 Ω gives: I LIMIT = ( 0.0198 A / W ) × RSET (5) A system capable of powering an 80-Watt AdvancedMC™ module consumes a maximum of 8.25 A according to MicroTCA™ specifications. The above equation suggests RSET = 417 Ω. The nearest 1% EIA value equals 422 Ω. The selection of RSET for MicroTCA™ power modules is described in the Redundant vs. Non-Redundant Inrush Current Limiting section. RSENSE MPASS IN12x RSET Fast Trip Comparator SENPx SENMx PASSx + 100 mV + 30 mA A1 675 mV + A2 Current Limit Amp SUM12x RSUM Figure 23. 12-V Channel Threshold Circuitry Fault Timer Programming The fault timers of the four channels in a TPS2358 use identical internal circuitry. Each channel requires an external capacitor CT connected between the CTx pin and ground. When a channel goes into current limit, the TPS2358 injects 10 µA into the external capacitor. If the channel remains in current limit long enough for the voltage on the CTx pin to reach 1.35 V, then the TPS2358 shuts the channel down and pulls the FLTx pin low to declare a fault. If the channel does not remain in current limit long enough to trip the timer, then the CTx capacitor is discharged through an internal 200-Ω pulldown resistor. The nominal fault time tf equals: tf = 1.35V CT 10 m A (6) The user should select capacitors that provide the shortest fault times sufficient to allow down-stream loads and bulk capacitors to charge. Shorter fault times reduce the stresses imposed on the pass FETs under fault conditions. This consideration may allow the use of smaller and less expensive FETs for the 12-V channels. 22 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 Multiswap Operation in Redundant Systems TheTPS2358 features an additional mode of operation called Multiswap redundancy. This technique does not require a microcontroller, making it simpler and faster than the redundancy schemes described in the MicroTCA™ standard. Multiswap is especially attractive for AdvancedMC™ applications that require redundancy but need not comply with the MicroTCA™ power module standard. In order to implement Multiswap redundancy, connect the SUM pins of the redundant supplies together and tie a single RSUM resistor from this node to ground. The current limit thresholds now apply to the sum of the currents delivered by the redundant supplies. When implementing multiswap redundancy on 12-V channels, all of the channels must use the same values of resistors for RSENSE and RSET. Figure 24 compares the redundancy technique advocated by the MicroTCA™ specification to multiswap redundancy. MicroTCA™ redundancy independently limits the current delivered by each power source. The current drawn by the load cannot exceed the sum of the current limits of the individual power sources. Multiswap redundancy limits the current drawn by the load to a fixed value regardless of the number of operational power sources. Removing or inserting power sources within a multiswap system does not affect the current limit seen by the load. MicroTCA TM Redundancy Power Source 2 mC TPS2358 SUM3x SUM12x TPS2358 SUM3x SUM12x RSUM12x mC SUM12x RSUM12x SUM3x RSUM3x RSUM12x SUM12x TPS2358 Power Source 2 SUM3x RSUM3x TPS2358 Power Source 1 Backplane RSUM3x Power Source 1 Multiswap Redundancy Backplane Figure 24. MicroTCA™ Redundancy vs. Multiswap Redundancy Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 23 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com 12-V Inrush Slew Rate Control As normally configured, the turn-on slew rate of the 12-V channel output voltage VOUT equals: dVout I src @ dt Cg (7) where ISRC equals the current sourced by the PASSx pin (nominally 30 µA) and Cg equals the effective gate capacitance. For purposes of this computation, one can assume that the effective gate capacitance approximately equals the reverse transfer capacitance, CRSS. To reduce the slew rate, increase Cg by connecting additional capacitance from PASSx to ground. Place a resistor of at least 1000 Ω in series with the additional capacitance to prevent it from interfering with the fast turn off of the FET. RSENSE IN12x R > 1k ! C PASSx Figure 25. RC Slew Rate Control 12-V ORing Operation for Redundant Systems The 12-V channels use external pass FETs to provide reverse blocking. The TPS2358 pulls the BLKx pin high when the input-to-output differential voltage VIN12x-OUT12x exceeds a nominal value of 10 mV, and it pulls the pin low when this differential falls below a nominal value of -3 mV. These thresholds provide a nominal 13 mV of hysteresis to help prevent false triggering (Figure 26). V GATE The source of the blocking FET connects to the source of the pass FET, and the drain of the blocking FET connects to the load. This orients the body diode of the blocking FET such that it conducts forward current and blocks reverse current. The body diode of the blocking FET does not normally conduct current because the FET turns on when the voltage differential across it exceeds 10 mV. 10 mV Gnd - 3 mV 25 V VOR Figure 26. ORing Thresholds 24 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 Using the TPS2358 to Control Two AdvancedMC™ Slots The TPS2358 has been designed for use on ATCA Carrier boards with a minimum number of external components. Carrier boards do not usually have redundant 3.3-V or 12-V supplies, so it is not necessary to provide ORing functions in the power supply feeds. Consequently, the external 12-V ORing FETs have been omitted and the BLKx pins are left unconnected. 12 V RSENSE NC AdvancedMC™ SENPA SETA SENMA PASSA BLKA IN12A From IPMC OUT12A OUT3A 3.3 V EN12A EN3A ORENA 3.3 V CT12A CT3A PG12A FLT12A PG3A FLT3A IN3A VDD3A To IPMC and/or LED’s SUM12A SUM3A 3.3 V VINT 12 V in AGND GND From IPMC TPS2358 GND GND GND 48 PIN QFN 3.3 V EN12B EN3B ORENB PG12B\ FLT12B\ PG3B\ FLT3B\ CT12B CT3B IN3B SUM12B VDD3B SUM3B OUT3B IN12B SENPB SETB SENMB PASSB BLKB To IPMC and/or LED’s 3.3 V OUT12B AdvancedMC™ RSET RSENSE NC 12 V Figure 27. Block Diagram of TPS2358 In a Non-Redundant System Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 25 TPS2358 SLUS820C – FEBRUARY 2008 – REVISED MAY 2008..................................................................................................................................................... www.ti.com Layout Considerations TPS2358 applications require layout attention to ensure proper performance and minimize susceptibility to transients and noise. In general, all runs should be as short as possible but the list below deserves first consideration. 1. Decoupling capacitors on IN12A, IN12B, IN3A, and IN3B should have minimal length to the pin and to GND. 2. SENMx and SENPx runs must be short and run side by side to maximize common mode rejection. Kelvin connections should be used at the points of contact with RSENSE (Figure 28). 3. SETx runs need to be short on both sides of RSET. 4. These runs should be as short as possible and sized to carry at least 20 Amps, more if possible. a. Runs on both side of RSENSE. b. Runs from the drains and sources of the external FETs. 5. Runs from the BLK FETs to OUT12x should be as short as possible. 6. Runs connecting to IN3x and OUT3x should be sized for 1 Amp or more. 7. Connections to GND and SUMx pins should be minimized after the runs above have been placed. 8. The device dissipates low to average power so soldering the powerpad to the board is not a requirement. However, doing so will improve thermal performance and reduce susceptibility to noise. LOAD CURRENT PATH LOAD CURRENT PATH SENSE RESISTOR R R SET SET 432 TPS2359 432 TPS2359 (a) (b) Figure 28. Recommended RSENSE Layout NOTE: Additional details omitted for clarity. 26 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 TPS2358 www.ti.com..................................................................................................................................................... SLUS820C – FEBRUARY 2008 – REVISED MAY 2008 Transient Protection TPS2358 devices in deployed systems are not likely to have long, inductive feeds or long load wires. However, it is always advised that an analysis be performed to determine the need for transient protection. When the TPS2358 interrupts current flow, any inductance on the input will tend to cause a positive voltage spike on the input, and any inductance on the output will tend to cause a negative voltage spike on the output. The following equations allow the designer to make a reasonably accurate prediction of the voltage spike due to interruptions in current. VSPIKE = VNOM + I LOAD L C (8) where: • VNOM = nominal voltage at terminal being analyzed • L = combined inductance of feed and RTN lines • C = capacitance at point of disconnect • ILOAD = current through terminal at TDISCONNECT • é ù æ 4 ´ length ö LSTRAIGHTWIRE ~ ê 0.2 ´ length ´ ln ç ÷ - 0.75 ú nH è diameter ø ë û This equation can be used to calculate the capacitance required to limit the voltage spike to a desired level above the nominal voltage: C= LI 2 (VSPIKE - VNOM )2 (9) Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS2358 27 PACKAGE OPTION ADDENDUM www.ti.com 9-May-2008 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty TPS2358RGZR ACTIVE QFN RGZ 48 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-3-260C-168 HR TPS2358RGZT ACTIVE QFN RGZ 48 250 CU NIPDAU Level-3-260C-168 HR Green (RoHS & no Sb/Br) Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 9-May-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS2358RGZR QFN RGZ 48 2500 330.0 16.4 7.3 7.3 1.5 12.0 16.0 Q2 TPS2358RGZT QFN RGZ 48 250 180.0 16.4 7.3 7.3 1.5 12.0 16.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 9-May-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS2358RGZR QFN RGZ 48 2500 346.0 346.0 33.0 TPS2358RGZT QFN RGZ 48 250 190.5 212.7 31.8 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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