TPS1689 - 9-80V 20A Stackable eFuse PMBus | Texas Instruments
MPN: TPS1689 ✓ NakahandaTPS1689 Ulas
An eFuse is an electronic circuit protection device that guards against overloads, short circuits, and excessive inrush current. Unlike traditional one-time fuses, eFuses are resettable and offer programmable current limits, making them essential for hot-swap applications where boards are inserted into live backplanes. The TPS1689 belongs to the hot-swap controller / integrated eFuse family within the broader power management IC hierarchy.
Key features include a PMBus interface for telemetry, control, and configuration, enabling real-time monitoring of voltage, current, and temperature. The integrated FET with RON of 3.65mOhm typ (3.5mOhm in newer datasheet revisions) minimizes conduction losses at 20A. Stackable operation allows multiple TPS1689x devices to be paralleled for higher current, with IMON pins tied together to report total current. The output withstands negative transient voltages up to -5V.
Technically, the integrated power FET eliminates external FET driving complexity of discrete hot-swap controllers, while PMBus-programmable current limits, slew rates, and fault responses provide design flexibility. Multiple protection modes cover overcurrent, overvoltage, undervoltage, and thermal shutdown, improving system-level reliability in power distribution trees.
Typical applications include 48V backplane hot-swap power, server and datacenter power distribution, telecom equipment, and industrial automation. The 9V-80V operating range fits 48V rails with transient headroom up to the 92V absolute maximum rating.
Design with the TPS1689 requires attention to thermal management: PCB copper area and thermal vias are essential at 20A continuous load. Configure PMBus registers so current-limit and fault-response settings match the application protection requirements.
Mga alternatibo na pwedeng ilagay na TPS1689 — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok TPS1689 (parehas na form factor at footprint) — pagkakaiba sa Absolute Maximum Input Voltage, Protection Modes.
TPS1689x-Q1
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →TPS1685x
⚡ Parehong Package📋 Alternatibo na Reference (hindi sa katalogo)
TPS1663x
⚡ Parehong Package ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
TPS25990
⚡ Parehong Package ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
ADP1048
⚡ Parehong Package ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
TPS1689 Mga Spesipikasyon
| Input Operating Voltage Range | 9 V to 80 V |
| Absolute Maximum Input Voltage | 92 V |
| Negative Output Transient Withstand | -5 V |
| Continuous Output Current | 20 A |
| Integrated FET ON-Resistance | 3.5 mOhm (typ) / 3.65 mOhm (typ, rev A) |
| Digital Interface | PMBus (telemetry, control, configuration) |
| Protection Modes | Overload, short circuit, inrush, overvoltage, undervoltage, thermal shutdown |
| Stackable / Parallel Operation | Yes (IMON pins tied together for total current reporting) |
| Telemetry Parameters | Voltage, current, temperature |
| Configuration | Programmable current limit, slew rate, fault response via PMBus |
| Uri ng Pagpapasok | Surface Mount |
| Evaluation Module | TPS1689EVM |
Pin Configuration ng TPS1689
| Pin [DATA_NEEDED] | IN — Input supply voltage (9V-80V) |
| Pin [DATA_NEEDED] | OUT — Protected output, withstands -5V transients |
| Pin [DATA_NEEDED] | GND — Ground reference |
| Pin [DATA_NEEDED] | IMON — Current monitor output, tie together for parallel total current |
| Pin [DATA_NEEDED] | PMBus SDA/SCL — PMBus telemetry, control, configuration interface |
| Pin [DATA_NEEDED] | EN/UVLO — Enable and undervoltage lockout programming |
Tipikal na mga Gamit
TPS1689 ay nararapat para sa 6 aplikasyons: 48V Backplane Hot-Swap Power, Server and Datacenter Power Distribution, Telecom Equipment Protection, Industrial Automation Power Trees, Base Station and Radio Unit Power, Battery Test and Energy Storage Systems.
48V Backplane Hot-Swap Power
The TPS1689 fits 48V backplane hot-swap directly: its 9V-80V operating range covers 48V rails with surge headroom to the 92V absolute maximum, and the integrated 3.5mOhm FET minimizes conduction drop at 20A. Inserted between the backplane 48V feed and the load board, it limits inrush during card insertion and clears faults without mechanical fuses. PMBus telemetry reports live current and voltage, enabling predictive maintenance at rack level.
Inirekomenda
Server and Datacenter Power Distribution
In datacenter power trees, the TPS1689 acts as a protection and monitoring stage on 48V distribution rails feeding server sleds. The integrated FET at 3.5mOhm typ keeps conduction loss to roughly 1.4W at 20A, preserving energy efficiency, while programmable current limit and fault response coordinate with upstream DC-DC stages. The stackable parallel mode scales current beyond 20A, and IMON tie-together reporting gives fleet managers total current visibility over PMBus.
Inirekomenda
Telecom Equipment Protection
Telecom -48V systems benefit from the TPS1689 wide input range and -5V negative transient withstand at the output, guarding against ring transients and reverse events common on telecom power buses. The eFuse replaces discrete hot-swap FET plus controller solutions, saving board area while PMBus configuration lets field engineers adjust current limits remotely. Thermal shutdown and overvoltage lockout protect line cards during fault conditions on live backplanes.
Inirekomenda
Industrial Automation Power Trees
Industrial control cabinets and automation modules use the TPS1689 on 48V intermediate buses feeding PLC I/O and drive electronics. Programmable inrush limiting via PMBus allows safe capacitor charging on high-capacitance loads, while short-circuit protection clears wiring faults in milliseconds. The device active status enables design-in with standard industrial temperature hardware; verify exact operating range in the datasheet ordering table for the selected suffix.
Inirekomenda
Base Station and Radio Unit Power
Remote radio units and 5G base station power stages draw tens of amps from -48V/48V feeds, where the TPS1689 provides resettable protection with PMBus visibility for unmanned sites. The 80V rating tolerates lightning-induced surge margin per widebus input designs, and paralleling multiple TPS1689x devices scales to radio peak loads while tying IMON pins reports aggregate draw. Fast overcurrent trip protects expensive PA and digital sections from shorted line events.
Inirekomenda
Battery Test and Energy Storage Systems
High-voltage battery test racks and 48V energy storage systems use the TPS1689 to protect charge/discharge paths. The 9V-80V window spans common 48V battery bus variants, PMBus telemetry streams voltage and current for state monitoring, and programmable fault response distinguishes overload from inrush during contactor switching. Negative transient withstand (-5V) handles reverse events during battery reversal tests, improving instrumentation robustness.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for TPS1689 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | TPS1689x-Q1 | TPS1685x | ADP1048 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Stackable Parallel Operation | Yes (IMON tie-together) | Yes | Yes (shares IMON scheme with TPS1689x) | No |
Pangunahing mga Pagkakaiba
- PMBus digital telemetry on a 20A eFuse (kumpara saTPS1663x)
- Stackable parallel operation with aggregate current reporting (kumpara saTPS25990)
- Automotive grade sibling available (kumpara saADP1048)
Talaan ng Disenyo
At 20A continuous load, conduction loss in the 3.5mOhm integrated FET is approximately I^2 x R = 1.4W. Provide generous PCB copper area under the exposed pad and an array of thermal vias to the inner layers to keep junction temperature within limits. Confirm theta_JA for the specific package suffix from the TI datasheet thermal table and verify worst-case ambient in the rack or cabinet environment.
Route the high-current IN-to-OUT path with wide traces or copper pours sized for 20A. Place input and output bulk capacitors close to the device to handle inrush events and to support the fast current-limit response. Keep the PMBus SDA/SCL traces short and away from the power loop to preserve telemetry signal integrity.
Do not exceed the 92V absolute maximum input rating; 48V rails with line transients require input TVS clamping with adequate margin. When paralleling multiple TPS1689x or TPS1685x devices, tie IMON pins together per the datasheet so total current is reported correctly, and ensure each device shares the same current-limit configuration to avoid current hogging.
Impormasyon ng Pagsunod sa Kautusan
Compliance not stated in reviewed sources; verify on TI product page. The TPS1689x-Q1 variant is automotive qualified.
