The TPS2477x is a high performance analog Hot Swap Controller for 2.5 V to 18 V systems. The precise and highly programmable protection settings of the TPS2477x aid the design of high power high availability systems where isolating faults is critical.
Programmable current limit, fast shut down, and fault timer protect the load and supply during fault conditions such as a hot - short. The fast shutdown threshold and response time can be tuned to ensure a fast response to real faults, while avoiding nuisance trips. Programmable Safe Operating Area (SOA) protection and the inrush timer keep the MOSFET safe under all conditions. After asserting power good, TPS2477x acts as a circuit breaker and runs the fault timer during over current events, but doesn’t current limit. It shuts down after the fault timer expires. Two independent timers (inrush/fault) allow the user to customize protection based on system requirements.
Finally, the flexibility of the TPS2477x aid Hot Swap design for the 240 VA requirement and a design example is shown in the datasheet.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS24770 TPS24771 TPS24772 |
RGE (24) | 4.00 mm x 4.00 mm |
DATE | REVISION | NOTES |
---|---|---|
March 2015 | * | Initial release. |
PART NUMBER(1) | LATCH / RETRY OPTION |
---|---|
TPS24770 | Latch |
TPS24771 | Auto – Retry |
TPS24772 | Fast Latch Off |
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
ENHS | 2 | I | Active-high enable input of Hot Swap. Logic input. Connects to resistor divider. |
FLTb | 4 | O | Active-low, open-drain output indicating various faults. |
FSTP | 16 | I | Fast trip programming set pin for Hot Swap. A resistor is connected from positive terminal of RSNS to FSTP. |
GND | 10 | – | Ground. |
HGATE | 18 | O | Gate driver output for external Hot Swap MOSFET. |
IMON | 12 | I/O | Analog monitor and current limit program point. Connect RIMON to ground. |
IMONBUF | 13 | O | Voltage output proportional to the load current (0V–3.0V). |
NC | 1,3, 6, 20–24 | NC | No connect. Tie to ground or leave floating. |
OUTH | 19 | I | Output voltage sensor for monitoring Hot Swap MOSFET's power. Connects to the source terminal of the Hot Swap N channel MOSFET. |
OV | 9 | I | Overvoltage comparator input. Connects to resistor divider. HGATE is pulled low when OV exceeds the threshold. Connect to ground when not used. |
PGHS | 5 | O | Active-high, open-drain power-good indicator. |
PLIM | 11 | I | Power limit programming pin. A resistor from this pin to GND sets the maximum power dissipation for the Hot Swap FET. Connect a 4.99 kΩ resistor to disable power limit. |
SENM | 17 | I | Current-sensing input for the sense resistor. Directly connects to the negative terminal of the sense resistor. |
SET | 15 | I | Current-limit programming set pin for Hot Swap. A resistor is connected from positive terminal of the sensing resistor. |
TFLT | 8 | I/O | Fault timer, which runs when the device is in regular operation and there is an overcurrent condition. |
TINR | 7 | I/O | Inrush timer, which runs during the inrush operation (start-up) if the part is in current limit or power limit. |
VDD | 14 | P | Power Supply |