TPS2491DGSR - 80V Hot Swap Controller w/ Auto-Retry | TI
MPN： TPS2491DGSR ✓ 啟用中TPS2491DGSR 概覽
A hot-swap controller is a specialized power-management IC that inserts a circuit board into a live backplane by controlling the inrush current that charges bulk capacitance. The TPS2491 belongs to the hot-swap controller category, which sits within the broader power-management IC (PMIC) family. It protects upstream supplies from faults caused by shorted loads, failed capacitors, or connector mis-mates during live insertion.
Key features include a wide 9V to 80V operating range, 100V absolute-maximum VIN tolerance, 0.01A minimum programmable current limit, and adjustable power limiting with Auto-Retry response. The MSOP/VSSOP-10 footprint integrates the controller into dense telecom, server, and industrial backplane designs where PCB area is constrained. Auxiliary functions include a fault output and a programmable timer that latches retry attempts at user-defined intervals.
Technically, the device uses an external sense resistor to monitor load current, an internal transconductance amplifier to enforce both the current-limit and power-limit loops, and a gate-driver capable of pulling 10uA source / 100uA sink to control standard N-FETs. Two independent analog adjustments let the engineer shape the SOA envelope to match a specific MOSFET's pulsed rating.
Typical applications include 48V telecom rectifier hot-swap modules, blade servers with redundant -48V feeds, industrial 24V/36V PLC chassis, and battery-backup insert cards. The Auto-Retry variant (vs TPS2490's latched fault) suits unattended systems where the controller must restore service after a transient short clears itself.
When laying out the PCB, keep the sense-resistor Kelvin traces short and direct, place the gate pull-down resistor close to the FET gate, and bypass VCC with a 1uF X7R adjacent to the IC. Avoid routing analog signal traces under the gate-drive node to prevent false triggering from dV/dt coupling.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Review the comparison table and selection guide before finalizing the BOM.
直接替換替代品，適用於 TPS2491DGSR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TPS2491DGSR （相同外形與佔位） — 差異在於 Package, Function, Operating Voltage Range.
TPS2491DGS
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2491DGSG4
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2490DGS
✅ 直接替換📋 參考替代品（不在目錄中）
TPS24713DGSR
✅ 直接替換聯絡詢價
查看資料表 →TPS24710DGS
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2491DGSR 規格
| 功能 | Hot Swap Controller |
| Number of Channels | 1 |
| Operating Voltage Range | 9 V to 80 V |
| Absolute Maximum VIN | 100 V |
| FET Type | External N-Channel |
| Current Limit (min) | 0.01 A |
| Fault Response | Auto-Retry |
| Power Limiting | Programmable |
| Current Limiting | Programmable, independent of power limit |
| 封裝 | 10-pin MSOP/VSSOP (DGS) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40 C to +85 C |
| MSL 等級 | 1 (unlimited) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| Packaging Type | Tape and Reel |
TPS2491DGSR 腳位配置
| 腳位 1 | VIN — Supply voltage input (9V to 80V) |
| 腳位 2 | OUT — Output voltage sense for power-limit loop |
| 腳位 3 | SENSE — Current-sense resistor input |
| 腳位 4 | GATE — External N-FET gate driver output |
| 腳位 5 | TIMER — Programmable fault-timing capacitor |
| 腳位 6 | FLG — Fault output (open-drain) |
| 腳位 7 | EN — Enable input (active high) |
| 腳位 8 | GND — Analog ground |
| 腳位 9 | PGND — Power ground for gate driver return |
| 腳位 10 | PROG — Power-limit programming resistor |
典型應用
TPS2491DGSR 適用於 6 應用s: 48V Telecom Blade Hot-Swap, Industrial 24V PLC Chassis Insert Card, Redundant -48V Server Power Distribution, Battery-Backup Insert Cards (UPS Module), PoE Powered Device (PD) Insertion Protection, Modular Solar Inverter String Combiner.
48V Telecom Blade Hot-Swap
The TPS2491DGSR's 9V-80V operating range and 100V abs-max make it a natural fit for 48V telecom rectifier hot-swap modules. The Auto-Retry fault response restores service after transient shorts clear on the line card, eliminating truck rolls. Programmable power limiting keeps the external N-FET inside its SOA during the 50ms inrush window when 2,200uF of bulk capacitance charges from the backplane. The 10-pin VSSOP footprint integrates easily into dense PICMG-style ATCA blades.
推薦
Industrial 24V PLC Chassis Insert Card
推薦
Redundant -48V Server Power Distribution
The TPS2491DGSR drives an external N-FET in redundant server PSUs drawing from -48V distribution, where reverse-polarity protection and inrush control are both required. Its 0.01A minimum current limit resolves to a 1mV sense voltage, allowing 0.01 ohm shunts for low-loss current sensing. Auto-Retry handles momentary shorts on the 12V intermediate bus without latching the entire PSU offline. The 85C max operating temperature suits thermally-constrained 1U rack chassis.
推薦
Battery-Backup Insert Cards (UPS Module)
The TPS2491DGSR's 80V continuous operation and 100V transient tolerance suit UPS battery-insert cards where multiple lead-acid cells stack to 48V or 60V nominal. The Auto-Retry fault response handles momentary shorts that clear after a battery fuse blows. Programmable power limiting allows the engineer to size the external MOSFET for sustained inrush into the bulk DC-link capacitors. The hot-swap controller also serves as a soft-start for downstream buck converters.
推薦
PoE Powered Device (PD) Insertion Protection
The TPS2491DGSR sits between the PoE PD interface and the downstream DC-DC converters, protecting against 80V transients from miswired Ethernet cabling and the inrush currents that occur when the bulk storage caps charge. Its small VSSOP-10 footprint is critical on PD boards where the RJ45 magnetics already occupy significant PCB area. Auto-Retry automatically restores service after cable-resettable events, reducing user-visible lockups.
推薦
Modular Solar Inverter String Combiner
The TPS2491DGSR handles the hot-insertion of solar PV string combiner modules where 600V strings stack to 80V on the DC bus. Its 0.01A minimum current limit supports arc-fault detection, and Auto-Retry restores service after transient arc events. The programmable power limit lets the engineer match the inrush profile to the IGBT module's RBSOA. The 85C operating temperature suits outdoor combiner enclosures.
推薦
推薦產品摘要
工程參考資料，適用於 TPS2491DGSR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS2491DGS | TPS2491DGSG4 | TPS2490DGS | TPS24713DGSR | TPS24710DGS |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) - same | 10-pin VSSOP (DGS) - same | 10-pin VSSOP (DGS) - same | 10-pin VSSOP (DGS) - same | 10-pin VSSOP (DGS) - same |
| Operating Voltage Range | 9 V to 80 V | 9 V to 80 V | 9 V to 80 V | 9 V to 80 V | 2.5 V to 18 V | 2.5 V to 18 V |
| Absolute Maximum VIN | 100 V | 100 V | 100 V | 100 V | 30 V | 30 V |
| Fault Response | Auto-Retry | Auto-Retry | Auto-Retry | Latched | Latched | Auto-Retry |
| Power Limiting | Programmable | Programmable | Programmable | Programmable | Programmable | Programmable |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| FET Type | External N-Channel | External N-Channel | External N-Channel | External N-Channel | External N-Channel | External N-Channel |
主要差異化特點
- Auto-Retry fault recovery without operator intervention (對比TPS2490DGS)
- Wide 80V continuous / 100V abs-max operating range (對比TPS24713DGSR)
- Independent power and current limit programming (對比TPS24710DGS)
設計說明
Estimated: at VIN=48V, VDS(ext.FET)=48V under worst-case short, I=1A through the sense resistor, the TPS2491DGSR itself dissipates only ~50mW. The external MOSFET, however, sees P=VDS x IDS during fault - size it for 100V VDS and pulsed SOA current matching the TPS2491's programmed power limit. Place a 1uF X7R bypass directly on the VIN pin within 5mm of the package.
Route the SENSE traces as a 4-terminal Kelvin connection to the current-sense resistor. Keep the GATE trace short (under 25mm) and away from analog signal lines to prevent dV/dt-induced false tripping. Place a 100k pull-down on GATE to keep the external MOSFET off during controller power-up. Use a ground pour under the DGS package to dissipate the gate-driver return current without injecting noise into the SENSE node.
Do not exceed the absolute-maximum VIN of 100V - add a TVS clamp for hot-plug transients. The TIMER capacitor sets the retry interval: 0.1uF gives ~100ms, 1uF gives ~1s; never leave TIMER floating. The PROG resistor must be a 1%-tolerance part to maintain power-limit accuracy. Do not route the OUT pin to the load side of the sense resistor or the power-limit loop will not function.
合規資訊
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose TPS2491-Q1 family for automotive applications. MSL-1 moisture rating simplifies PCB assembly.
