Features: ` Supports PCI, PCI−X 1.0 and PCI−X 2.0
` Internal Power Switches for 12 V, 12 V, 3.3 V Aux
` Control for External Power Switches for 5 V, 3.3 V, and VIo
` Overload Protection on All Supplies
` Input Under-Voltage Protection for 3.3 V, 5 V, 12 V and VAUX Supplies
` Soft Start to Minimize Inrush Current
` Programmable Slew Rate for 3.3 V, 5 V, 12 V, VIO and VAUX Supplies
` Multi-Slot or Single-Slot Serial Operating Mode
` Direct Operating Mode
` VIO Selection Based on Card Type
` 80-Lead PowerPad™ TQFP PackageApplication·Hot Plug Slots in ServersPinout
Specificationsover operating free-air temperature range (unless otherwise noted)† ‡
| PARAMETER |
TPS2342 |
UNIT |
| Input voltage range, P12VIN, BUTTONA |
−0.5 to 15 |
V |
| M12VIN |
−15.0 to 0.5 |
| All others |
−0.5 to 7 |
| Output voltage range, P12VO, 5V3VG, 15VG, VIOG |
−0.5 to VP12VIN + 0.5 |
| P12VG |
−0.5 to 28 |
| M12VO |
−15 to 0.5 |
| Output current pulse, P12VO (dc internally limited) |
3 |
A |
| M12VO |
0.8 |
| 3VAUX |
2 |
| Operating junction temperature range, TJ |
−40 to 100 |
|
| Storage temperature range, Tstg |
−65 to 150 |
| Lead temperature soldering 1.6 mm (1/16 inch) from case for 10 seconds |
260 |
† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to Absolute Maximum Rated conditions for extended periods may affect device reliability
‡ All voltages are with respect to DIGGND.
DescriptionThe TPS2342 contains main supply power control, auxiliary supply power control, power FETs for 12-V, −12-V and auxiliary 3.3-V supplies, VIO control, and digital control of slots. Each TPS2342 contains supply control and switching for two slots.
The TPS2342 supports both serial and direct communication to the slots. The main power control circuits start with all supplies off and all outputs are held off until all power supplies to the TPS2342 are valid. When power is requested via the serial interface or by direct control, the control circuit applies constant current to the gates of the power FETs, allowing each FET to ramp load voltage linearly. Each supply can be programmed for a desired ramp rate by selecting the appropriate gate capacitor. The power control circuits monitor load current and latch off that slot if the load current exceeds a programmed maximum value. Once the 12-V, the 5-V, and the 3.3-V FETs are fully enhanced, the load voltage is monitored. If the load voltage drops out of specification after these FETs are fully enhanced, the slot latches off.
TPS2342 Data Sheet
