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eFuses (integrated hot swaps)

TPS1685

ACTIVE

9V to 80V, 3.5mΩ, 20A stackable integrated hot swap (eFuse) with accurate and fast current monitor

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Data sheet

TPS1685

ACTIVE
Data sheet Order now

Product details

Vabsmax_cont (V) 92 Vin (max) (V) 80 Vin (min) (V) 9 Current limit (max) (A) 20 Current limit (min) (A) 2 Features Current monitoring, Fault output, Overcurrent protection, Overvoltage protection, Power good signal, Short-circuit protection, Soft-start, Thermal shutdown Overcurrent response Circuit breaker Fault response Auto-retry, Latch-off Ron (typ) (mΩ) 3.5 Overvoltage response Cut-off Rating Catalog Soft start Adjustable Quiescent current (Iq) (typ) (A) 0.0022 Device type eFuses and hot swap controllers Operating temperature range (°C) -40 to 125
Vabsmax_cont (V) 92 Vin (max) (V) 80 Vin (min) (V) 9 Current limit (max) (A) 20 Current limit (min) (A) 2 Features Current monitoring, Fault output, Overcurrent protection, Overvoltage protection, Power good signal, Short-circuit protection, Soft-start, Thermal shutdown Overcurrent response Circuit breaker Fault response Auto-retry, Latch-off Ron (typ) (mΩ) 3.5 Overvoltage response Cut-off Rating Catalog Soft start Adjustable Quiescent current (Iq) (typ) (A) 0.0022 Device type eFuses and hot swap controllers Operating temperature range (°C) -40 to 125
LQFN-CLIP (VMA) 23 30 mm² (5 mm × 6 mm)
  • Input operating voltage range: 9V to 80V
    • 92V absolute maximum
    • Withstands negative voltages up to –5V at output
  • Integrated FET with low on-resistance: RON = 3.5mΩ (typical)
  • Active high enable input with adjustable undervoltage lockout (UVLO)
  • Adjustable overvoltage protection
  • Supports parallel connection of multiple eFuses with device state synchronization and current sharing
  • Adjustable output slew rate control (dVdt) for inrush current protection
  • Precise load current monitoring
    • <3% error for over 50-100% of maximum current
    • 1MHz bandwidth
  • Robust overcurrent protection
    • Circuit-breaker response
    • Adjustable threshold: 2A to 20A
    • Overcurrent protection accuracy: ±3%
    • Adjustable transient overcurrent timer (ITIMER) to support peak currents
  • Fast-trip response to short-circuit events
  • Overtemperature protection (OTP) with analog die temperature monitor output (TEMP)
    • FET SOA: 0.7W√s
  • FET health monitoring and reporting
  • Fault indication pin (FLT )
  • Power Good indication pin (PGOOD)
  • Small footprint: QFN 6mm × 5mm
    • IPC9592B clearance for 60V
  • Input operating voltage range: 9V to 80V
    • 92V absolute maximum
    • Withstands negative voltages up to –5V at output
  • Integrated FET with low on-resistance: RON = 3.5mΩ (typical)
  • Active high enable input with adjustable undervoltage lockout (UVLO)
  • Adjustable overvoltage protection
  • Supports parallel connection of multiple eFuses with device state synchronization and current sharing
  • Adjustable output slew rate control (dVdt) for inrush current protection
  • Precise load current monitoring
    • <3% error for over 50-100% of maximum current
    • 1MHz bandwidth
  • Robust overcurrent protection
    • Circuit-breaker response
    • Adjustable threshold: 2A to 20A
    • Overcurrent protection accuracy: ±3%
    • Adjustable transient overcurrent timer (ITIMER) to support peak currents
  • Fast-trip response to short-circuit events
  • Overtemperature protection (OTP) with analog die temperature monitor output (TEMP)
    • FET SOA: 0.7W√s
  • FET health monitoring and reporting
  • Fault indication pin (FLT )
  • Power Good indication pin (PGOOD)
  • Small footprint: QFN 6mm × 5mm
    • IPC9592B clearance for 60V

The TPS1685x is an integrated high current circuit protection and power management device. The device provides multiple protection modes using very few external components and is a robust defense against overloads, short-circuits and excessive inrush current. Applications with particular inrush current requirements can set the output slew rate with an external capacitor. The user sets the output current limit level per system needs. A user adjustable overcurrent blanking timer allows systems to support transient peaks in the load current without tripping the eFuse. An integrated fast and accurate sense analog load current monitor facilitates predictive maintenance and advanced dynamic platform power management such as Intel PSYS and PROCHOT# to optimize server and data-center performance.

Connect multiple TPS1685x devices in parallel to increase the total current capacity for high power systems. All devices actively synchronize the operating state and share current during start-up as well as steady state to avoid over-stressing some of the devices which can result in premature or partial shutdown of the parallel chain.

The devices are characterized for operation over a junction temperature range from –40°C to +125°C.

The TPS1685x is an integrated high current circuit protection and power management device. The device provides multiple protection modes using very few external components and is a robust defense against overloads, short-circuits and excessive inrush current. Applications with particular inrush current requirements can set the output slew rate with an external capacitor. The user sets the output current limit level per system needs. A user adjustable overcurrent blanking timer allows systems to support transient peaks in the load current without tripping the eFuse. An integrated fast and accurate sense analog load current monitor facilitates predictive maintenance and advanced dynamic platform power management such as Intel PSYS and PROCHOT# to optimize server and data-center performance.

Connect multiple TPS1685x devices in parallel to increase the total current capacity for high power systems. All devices actively synchronize the operating state and share current during start-up as well as steady state to avoid over-stressing some of the devices which can result in premature or partial shutdown of the parallel chain.

The devices are characterized for operation over a junction temperature range from –40°C to +125°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS1685x 9V to 80V, 3.5mΩ, 20A Stackable Integrated Hotswap (eFuse) With Accurate and Fast Current Monitor datasheet (Rev. D) PDF | HTML Jul 14, 2026
Application note Active Current Sharing: Advanced Current Distribution Feature From TI's Smart eFuses PDF | HTML May 9, 2025
Technical article Powering modern AI data centers with industry’s first integrated 48V integrated hot swap (eFuse) PDF | HTML Feb 25, 2025
Application note Enhancing Server Power Design Using Advanced Features of TI’s Smart eFuses PDF | HTML Jan 29, 2025

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS1685EVM — TPS1685 evaluation module

The TPS1685EVM is used to evaluate the performance of the TPS1685 eFuse device. The TPS1685EVM comes with two TPS16850 eFuses connected in parallel to evaluate a 54V (typical) and 40A (steady state) design. This evaluation module incorporates two TPS16850 devices in parallel, which supports a 2kW (...)
User guide: PDF | HTML
Supported products & hardware
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Simulation model

TPS1685 PSpice Transient Model

SLVMED5.ZIP (68 KB) - PSpice model
Supported products & hardware
Simulation model

TPS16851 PSpice Transient Model

SLVMED3.ZIP (66 KB) - PSpice model
Supported products & hardware
Calculation tool

TPS1685-CALC — TPS1685 Design Calculator

The design calculator allows customer to size the external peripheral components while designing with TPS1685 eFuse.
Supported products & hardware
Calculation tool

TVS-RECOMMENDATION-CALC — TVS diode recommendation tool

This tool suggests suitable TVS for given system parameters and abs max voltage rating of the device.
Supported products & hardware
Reference design

TIDA-050090 — 54V 5kW power path protection reference design for AI data centers using TPS1689 and TPS1685 eFuses

This reference design illustrates a 54V, 5kW input power path protection circuit for AI-powered data centers, utilizing one TPS1689 and five TPS1685 eFuse devices in parallel. These integrated high- current circuit protection devices provide multiple protections using a few external components, (...)

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LQFN-CLIP (VMA) 23 Ultra Librarian
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