LTC1644

Features:

*Allows Safe Board Insertion and Removal from
   a  Live, CompactPCI ^TM Bus
* Controls 12V, 3.3V, 5V and 12V Supplies
* Adjustable Foldback Current Limit with Circuit Breaker
* Dual-Level Circuit Breakers Protect 5V and 3.3V
    Supplies from Overcurrent and Short-Circuit Faults
*LOCAL_PCI_RST# Logic On-Chip
* PRECHARGE Output Biases I/O Pins During Card
   Insertion and Extraction
* Adjustable Supply Voltage Power-Up Rate

Application

* Hot Board Insertion into CompactPCI Bus


Pinout




Specifications

Supply Voltages
12VIN .................................................................... 13.2V
VEEIN .................................................................... 14V
Input Voltages (Pins 5, 9) .......................0.3V to 13.5V
Output Voltages (Pins 6, 7, 10) ..............0.3V to 13.5V
Analog Voltages and Currents
Pins 3, 11 to 14, 16 to 18 ......................0.3V to 13.5V
Pins 4, 15 ................................ 0.3V to (12VIN + 0.3V)
VEEOUT .....................................................14V to 0.3V
12VOUT ..................................................0.3V to 13.2V
Operating Temperature Range
LTC1644C ................................................ 0°C to 70°C
LTC1644I ............................................ 40°C to 85°C
Storage Temperature Range ............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................ 300°C



Description

The LTC® 1644 is a Hot SwapTM controller that allows a board to be safely inserted and removed from a CompactPCI bus slot. External N-channel transistors control the 3.3V/5V supplies, while on-chip switches control the 12V and 12V supplies. The 3.3V and 5V supplies can be ramped up at a programmable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. The PWRGD output indicates when all of the supply voltages are within tolerance. The OFF/ON pin is used to cycle the board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#.