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TPS1685

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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 x 6
  • 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 (typ)
  • 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 max 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 (typ)
  • 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 max 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 a single external capacitor. Output current limit level can be set by user as 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.

Multiple TPS1685x devices can be connected 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 of –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 a single external capacitor. Output current limit level can be set by user as 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.

Multiple TPS1685x devices can be connected 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 of –40°C to +125°C.
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Technical documentation

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Type Title Date
* Data sheet TPS1685x 9V–80V, 3.5mΩ, 20A Stackable Integrated Hotswap (eFuse) With Accurate and Fast Current Monitor datasheet (Rev. C) PDF | HTML 11 Aug 2025
Application note Active Current Sharing: Advanced Current Distribution Feature From TI's Smart eFuses PDF | HTML 09 May 2025
Technical article 利用業界首款整合式 48V 整合熱插拔 (eFuse) 為現代 AI 資料 中心供電 PDF | HTML 20 Mar 2025
Technical article 업계 최초의 48V 통합 핫 스왑(eFuse)으로 최신 AI 데이터 센터에 전력 공급 PDF | HTML 20 Mar 2025
Technical article Powering modern AI data centers with industry’s first integrated 48V integrated hot swap (eFuse) PDF | HTML 25 Feb 2025
Application note Enhancing Server Power Design Using Advanced Features of TI’s Smart eFuses PDF | HTML 29 Jan 2025

Design & development

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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
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Simulation model

TPS1685 PSpice Transient Model

SLVMED5.ZIP (68 KB) - PSpice Model
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Simulation model

TPS16851 PSpice Transient Model

SLVMED3.ZIP (66 KB) - PSpice Model
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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

Supported products & hardware

Products
eFuses (integrated hot swaps)
  • TPS1685 — 9V to 80V, 3.5mΩ, 20A stackable integrated hot swap (eFuse) with accurate and fast current monitor
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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LQFN-CLIP (VMA) 23 Ultra Librarian
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