Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
Table of Contents Section 1 – New and Featured Products
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®<br />
Power Management <strong>Products</strong> [Hotswap, Power Sequencing, System & Battery Management]<br />
X80070/X80071/X80072/X80073 Hotswap Controller with Advanced Fault Protection <strong>and</strong> Voltage Regulator<br />
Product Highlights<br />
• Hotswap. Protection <strong>of</strong> circuits from hot voltages during backplane<br />
insertion/extraction<br />
• Complete Electronic Circuit Breaker<br />
• See Application Note: AN169<br />
Key Features<br />
• Hot Swap Controller<br />
— Overvoltage <strong>and</strong> undervoltage protection<br />
— Undervoltage lookout for battery/redundant supplies<br />
— Electronic circuit breaker<br />
— Selectable gate current for slew rate for external FET gate control<br />
— Drain sense for power good control<br />
— Overcurrent detection <strong>and</strong> gate shut-<strong>of</strong>f<br />
— 3X overcurrent limit on insertion<br />
— 5µs overcurrent filter<br />
— Hardshort retry <strong>and</strong> indicator<br />
— Typically operates from -30V to -80V, Tolerates transients<br />
to -200V (limited by external components)<br />
— S<strong>of</strong>t re-insertion<br />
— S<strong>of</strong>t extraction<br />
• Voltage Regulator Output for Supervisory Functions<br />
• Debounced Manual Reset Input<br />
Description<br />
The X80070 is a hot swap controller that allows a board to be<br />
safely inserted <strong>and</strong> removed from a live backplane without<br />
turning <strong>of</strong>f the main power supply.<br />
During insertion, the gate <strong>of</strong> an external power MOSFET is<br />
clamped low to suppress contact bounce. The under-voltage/<br />
over-voltage circuits <strong>and</strong> the power on reset circuitry suppress<br />
the gate turn on until the mechanical bounce has ended. The<br />
X80070 turns on the gate with a slew rate to limit the inrush<br />
current <strong>and</strong> incorporates an electronic circuit breaker set by a<br />
sense resistor. After the load is successfully charged, the<br />
PWRGD signal is asserted; indicating that the device is ready to<br />
power sequence the DC-DC power bricks.<br />
At all times, the X80070 monitors for undervoltage, overvoltage,<br />
<strong>and</strong> overcurrent conditions. If any fault occurs, the gate<br />
will be immediately shut <strong>of</strong>f <strong>and</strong> the PWRGD will be returned to<br />
the inactive state. The X80070 contains overvoltage, undervoltage<br />
<strong>and</strong> overcurrent detection, hardshort retry, gate control<br />
slew rate <strong>and</strong> power good control.<br />
Block Diagram<br />
Benefits<br />
• X80070/71/72/73 <strong>of</strong>fers slew rate (inrush current)<br />
control via the IGQ1 <strong>and</strong> IGQ0 pins. Use VRGO to<br />
bias IGQ1 <strong>and</strong> IGQ0 pins<br />
• Inrush vs. Gate Current Control can be achieved for<br />
various loading <strong>and</strong> transients. Changing IGQ1 <strong>and</strong><br />
IGQ0 can change the surge current <strong>and</strong> gate<br />
Pin Configuration<br />
X80070<br />
20L QFN Package<br />
MR<br />
IGQ0<br />
IGQ1<br />
PWRGD<br />
BATT-ON<br />
V +<br />
UV/OV<br />
<strong>–</strong><br />
V OV Ref<br />
+<br />
<strong>–</strong><br />
2:1<br />
V UV1 Ref<br />
MUX<br />
+<br />
<strong>–</strong><br />
BATT-ON<br />
GATE<br />
IGQ1<br />
IGQ0<br />
SENSE<br />
V EE<br />
V EE<br />
3R<br />
V UV2 Ref<br />
50uA<br />
Slew Rate<br />
Selection<br />
V OC REF<br />
38R<br />
Gate<br />
Control<br />
V DD<br />
Power Good<br />
Logic<br />
Over current logic,<br />
Hard short relay,<br />
Retry logic status<br />
<strong>and</strong> delay<br />
POR<br />
Reset Logic<br />
<strong>and</strong> Delay<br />
5V reg<br />
V EE<br />
V EE<br />
PWRGD<br />
FAR<br />
V DD<br />
V RGO<br />
V RGO<br />
DNC<br />
NA2<br />
NA2<br />
V DD<br />
20 19 18 17 16<br />
1<br />
2<br />
15<br />
14<br />
3 5mm x 5mm 13<br />
4<br />
5 6 7 8 9<br />
12<br />
11<br />
10<br />
FAR<br />
NA2<br />
NA1<br />
NA1<br />
DNC<br />
V EE<br />
MR<br />
+<br />
<strong>–</strong><br />
Timing/<br />
Control Logic<br />
V EE<br />
V UV/OV<br />
SENSE<br />
GATE<br />
DNC<br />
TOP VIEW<br />
Hotswap<br />
Controller<br />
Fault<br />
Protection<br />
Voltage<br />
Regulator<br />
See Product Family Tree<br />
on page 2-14<br />
1<strong>–</strong>20 www.xicor.com
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