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Analog Devices Inc. LT8495HFE#TRPBF
- Part No.:
- LT8495HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8495HFE#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
LT8495HFE#TRPBF from Analog Devices is a high-voltage monolithic SEPIC/boost/flyback DC/DC controller with integrated 2A/70V NPN power switch, programmable POR and watchdog timer, 9µA quiescent current in active operation, and –40°C to 150°C junction temperature rating. It supports wide input ranges (up to 60V for SEPIC, 32V for boost/flyback), dual supply pins (VIN/BIAS) for extended battery life below 2.5V, and low-ripple Burst Mode® operation maintaining <10mV output ripple at light loads - used in automotive ECU power supplies requiring high reliability under thermal stress.
For engineers reviewing the LT8495HFE#TRPBF datasheet, LT8495HFE#TRPBF pinout, LT8495HFE#TRPBF application, or LT8495HFE#TRPBF equivalent, key selection criteria include its FMEA-fault-tolerant TSSOP package, independent CPOR/CWDT capacitor-programmable reset/watchdog timing, UVLO programmability on SWEN/RSTIN, and thermal-rated operation up to 150°C junction temperature - critical for under-hood automotive and industrial power designs.
Technical Context
The LT8495HFE#TRPBF implements constant-frequency current-mode control with adjustable oscillator (250kHz–1.5MHz via RT resistor), quadratic ramp compensation, and frequency foldback during start-up to stabilize duty cycle. Its dual-supply architecture automatically selects between VIN and BIAS for NPN base drive, enabling operation down to ~1V after start-up when BIAS remains active.
Integrated fault tolerance includes open-circuit and adjacent-pin-short resilience in the TSSOP package, preventing overvoltage failure. The power-on reset (POR) asserts RST for a capacitor-programmed delay (tRST = 8.5–11.85ms with CPOR = 4.7nF), while the watchdog monitors WDI edges within user-defined upper/lower boundaries (tWDU/tWDL set by CWDT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive applications without derating. |
| Switch Rating | 2A continuous, 70V VCE - supports high-voltage SEPIC topologies up to 60V input. |
| IQ (Active) | ≤9µA at 12VIN/5VOUT - enables multi-year battery life in always-on portable systems. |
| Output Ripple | <10mVTYP in Burst Mode - meets noise-sensitive analog/RF supply requirements without additional filtering. |
| Programmable Frequency | 250kHz to 1.5MHz via RT resistor - allows EMI optimization and inductor size trade-offs. |
| Reset Timeout (tRST) | 8.5–11.85ms with CPOR = 4.7nF - ensures reliable microcontroller initialization timing. |
| Watchdog Boundaries | tWDU = 14.9–20.9ms / tWDL = 580–812µs (CWDT = 1nF) - provides robust windowed supervision of MCU activity. |
Pinout & Package
LT8495HFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed pad (Pin 21) soldered to PCB ground for thermal management (θJA = 38°C/W). Pin functions are validated per Linear Technology (Analog Devices) datasheet Rev. 8495fb.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (Pin 1) | Secondary supply input | Enables operation below 2.5V VIN by powering switch driver from regulated output - extends battery runtime. |
| FB (Pins 2,3) | Feedback reference node | Regulates to 1.202V ±24mV; sets output voltage via external resistor divider - precision reference for stable regulation. |
| CPOR (Pin 5) | POR/reset timing capacitor | Programs RST assertion duration (tRST) - determines minimum reset pulse width for safe MCU boot. |
| CWDT (Pin 6) | Watchdog timing capacitor | Sets watchdog window boundaries (tWDU/tWDL) - defines valid WDI edge interval for fault detection. |
| RST (Pin 7) | Open-drain reset output | Asserts low ≤150mV at 1.25mA sink - directly interfaces with standard logic-level reset inputs. |
| SWEN (Pin 12) | Switch enable control | UVLO threshold = 1.0V ±100mV with hysteresis - enables programmable input undervoltage lockout. |
| RSTIN (Pin 11) | Reset input reference | Compares to internal 1.1V reference; asserts RST when voltage drops below ~92% of FB - supports external supply monitoring. |
| WDE (Pin 13) | Watchdog enable input | Logic-high (>1.1V) activates watchdog; low disables WDO - allows dynamic watchdog control by host MCU. |
| WDI (Pin 16) | Watchdog input signal | Edge-triggered; requires periodic negative transitions within tWDU/tWDL - detects MCU hang or software freeze. |
| VIN (Pin 18) | Main supply input | Withstands 60V max; powers control circuitry and switch driver - supports wide-input industrial/battery systems. |
| SW (Pin 20) | Switch collector node | Connects to external inductor/diode; handles 70V peak voltage and 2.55A peak current - defines topology interface point. |
| GND (Pins 3,4,11,13,14,15 + Exposed Pad 21) | Power and signal reference | All GND pins and exposed pad must be soldered to local ground plane - ensures low-impedance return and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-fault-tolerant TSSOP | Adjacent pin shorts or opens cannot raise output above programmed value - eliminates single-point failure risk in safety-critical systems. |
| Dual-supply automatic selection | VIN/BIAS pins dynamically route base drive to lower-voltage source - enables seamless transition to BIAS-only operation below 2.5V VIN. |
| Low-ripple Burst Mode® | Maintains <10mV output ripple at light loads while drawing <9µA - avoids audible noise and preserves efficiency in standby modes. |
| Capacitor-programmable timing | CPOR and CWDT pins set reset delay and watchdog windows independently - eliminates need for external timers or microcontroller intervention. |
| Programmable UVLO on SWEN/RSTIN | Resistor dividers configure turn-on thresholds - supports custom input voltage sequencing and supply monitoring. |
| Frequency foldback at start-up | Reduces switching frequency when FB < 1V - prevents current limit instability during soft-start and low-VIN conditions. |
Applications
| Automotive Engine Control Unit (ECU) Power | Portable Medical Device Battery Supply |
|---|---|
|
Use Scenario: Powers microcontroller, CAN transceiver, and sensors in engine compartment where ambient temperature reaches 125°C and input voltage swings from cold-crank (6V) to load-dump (40V). IC Role / Device Role / Timing Role: Primary DC/DC controller providing isolated 5V rail; POR ensures deterministic MCU boot after ignition; watchdog supervises firmware execution. Use Value: 150°C junction rating eliminates need for derating or heatsinking; dual-supply operation sustains regulation during cranking; fault-tolerant pinout prevents overvoltage faults during ESD events. |
Use Scenario: Powers glucose meter or handheld ultrasound unit from single Li-ion cell (2.7–4.2V), requiring multi-year shelf life and sub-10mV ripple for analog front-end stability. IC Role / Device Role / Timing Role: Boost converter generating 3.3V rail; Burst Mode® minimizes quiescent draw; programmable UVLO disables output before battery deep discharge. Use Value: 9µA active IQ and 0.3µA shutdown current maximize battery longevity; low-ripple operation avoids ADC noise coupling; compact TSSOP fits space-constrained PCBs. |
| Industrial Programmable Logic Controller (PLC) I/O Module | Smart Sensor Node with Edge AI |
|
Use Scenario: Supplies isolated 5V/12V rails for digital I/O and analog signal conditioning in factory automation equipment operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: SEPIC controller accepting 12–48V DC input; watchdog monitors fieldbus communication processor; RSTIN monitors auxiliary 3.3V rail. Use Value: Wide 1V–60V input range accommodates unregulated industrial supplies; 150°C rating ensures reliability without forced air; FMEA design prevents system-level overvoltage faults. |
Use Scenario: Powers ultra-low-power microcontroller and MEMS sensor in wireless vibration monitor deployed on rotating machinery with ambient temperatures up to 105°C. IC Role / Device Role / Timing Role: Boost regulator charging supercapacitor from energy harvester; POR guarantees clean boot after wake-up; WDI supervision detects firmware stalls during inference cycles. Use Value: Dual-supply operation maintains regulation as harvester voltage decays; capacitor-programmable timing eliminates firmware overhead; TSSOP package enables high-density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller with integrated watchdog and POR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EFE#PBF | Higher 60V input rating, but no integrated watchdog timer; requires external supervisor IC for reset/watchdog functionality. | Lacks single-chip POR+watchdog integration - increases BOM count and board area for safety-critical applications. | Choose when only high-voltage boost/SEPIC control is needed without embedded supervision. |
| MAX16922ATP+ | Automotive-qualified 40V controller with integrated watchdog, but fixed 2.2MHz frequency and no Burst Mode - higher IQ (25µA). | Optimized for infotainment systems; lacks programmable frequency and low-noise light-load operation. | Prefer for cost-sensitive automotive clusters where EMI filtering is less critical and thermal margin is ample. |
Compared with LTC3895EFE#PBF and MAX16922ATP+, the LT8495HFE#TRPBF uniquely combines 150°C operation, capacitor-programmable watchdog/POR, and <10mV Burst Mode ripple - making it optimal for thermally constrained, safety-aware industrial and automotive power designs requiring minimal external components.
Availability
LT8495HFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical device battery supply, industrial PLC I/O modules, and smart sensor nodes requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8495HFE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8495HFE#TRPBF belongs to the LT® high-voltage power controller family, designed specifically for ruggedized DC/DC conversion in thermally demanding environments with integrated system supervision - targeting automotive under-hood, industrial control, and portable medical applications.
FAQ
What is the maximum input voltage supported by the LT8495HFE#TRPBF in SEPIC topology?
The LT8495HFE#TRPBF supports up to 60V input voltage in SEPIC topology, as specified in the Absolute Maximum Ratings and confirmed in the Applications Information section. This rating applies regardless of the H-grade temperature qualification and is validated for continuous operation - enabling use in industrial and automotive systems with wide input transients.
How does the LT8495HFE#TRPBF achieve 0.3µA shutdown current?
The LT8495HFE#TRPBF achieves ~0.3µA shutdown current when SWEN, WDE, and RSTIN are all held low, disabling all internal circuitry including the oscillator, error amplifier, and power switch driver. This ultra-low state is explicitly characterized in the Electrical Characteristics table and is independent of VIN or BIAS voltage - critical for battery-backed systems requiring decade-long shelf life.
Can the LT8495HFE#TRPBF operate with VIN below 2.5V after startup?
Yes, the LT8495HFE#TRPBF can operate with VIN below 2.5V after startup by drawing power from the BIAS pin, which may be connected to the output rail. The datasheet confirms operation down to ~1V VIN when BIAS ≥ 2.5V, enabled by automatic supply selection logic - extending usable battery range in portable applications beyond conventional controllers.
What is the purpose of the NC pins on the LT8495HFE#TRPBF TSSOP package?
The NC pins (Pins 4, 9, 17, 19) on the LT8495HFE#TRPBF TSSOP package are intentionally unconnected to internal circuitry and must remain floating to preserve FMEA fault tolerance. Shorting or tying them to GND/VIN would compromise the package's ability to withstand adjacent-pin faults without causing output overvoltage - a key safety feature documented in the Pin Functions section.
How is the watchdog timeout period adjusted on the LT8495HFE#TRPBF?
The watchdog timeout period on the LT8495HFE#TRPBF is adjusted using an external capacitor on the CWDT pin (Pin 6), which sets both upper (tWDU) and lower (tWDL) boundaries. With CWDT = 1nF, tWDU = 14.9–20.9ms and tWDL = 580–812µs - values verified in the Electrical Characteristics table and Typical Performance Characteristics plots G17–G22.
LT8495HFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Charge Pump, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.202V
- Voltage - Output (Max):
- 70V (Switch)
- Current - Output:
- 2.1A (Switch)
- Frequency - Switching:
- 250kHz ~ 1MHz
- Synchronous Rectifier:
- Both
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8495HFE#TRPBF FAQ
1.How can I place an order for LT8495HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8495HFE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8495HFE#TRPBF reliable?
The price and inventory of LT8495HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8495HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8495HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8495HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8495HFE#TRPBF?
LT8495HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8495HFE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8495HFE#TRPBF?
For technical support, including LT8495HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8495HFE#TRPBF requirements.
6.How does Aetrix verify that LT8495HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8495HFE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8495HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8495HFE#TRPBF?
All LT8495HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8495HFE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8495HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8495HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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