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Analog Devices Inc. LT8495IFE#TRPBF
- Part No.:
- LT8495IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8495IFE#TRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,450
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Product details
Overview
LT8495IFE#TRPBF from Analog Devices is a 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 dual supply pins (VIN/BIAS) enabling operation down to ~1V after startup. It targets automotive ECU power, portable product supplies, and industrial systems requiring wide input range and ultra-low standby consumption.
For engineers reviewing the LT8495IFE#TRPBF datasheet, LT8495IFE#TRPBF pinout, LT8495IFE#TRPBF application, or LT8495IFE#TRPBF equivalent, key selection criteria include its 250kHz–1.5MHz adjustable switching frequency, FMEA-fault-tolerant TSSOP package, low-ripple Burst Mode operation (<10mV output ripple), and independent capacitor-programmable reset (tRST = 8.5–11.85ms) and watchdog (tWDL = 580–812µs, tWDU = 14.9–20.9ms) timing.
Technical Context
The LT8495IFE#TRPBF implements constant-frequency current-mode control with quadratic ramp compensation and frequency foldback below 1V FB voltage to ensure stable start-up. Its dual-supply architecture automatically selects the lower-voltage source (VIN or BIAS) for NPN base drive, enabling operation even when VIN drops below 2.5V post-startup - critical for battery-backed systems.
Integrated fault tolerance in the TSSOP package ensures adjacent pin shorts or opens do not cause overvoltage at the output. The watchdog timer operates independently of VIN via BIAS supply and responds to WDI edge timing violations by asserting WDO low for a CPOR-programmed duration, while RSTIN provides UVLO-triggered reset with 86–97% of FB reference threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 70V VCE, 2.55A typical current limit at min duty cycle - supports 60V SEPIC inputs and 32V boost with 60V ride-through. |
| Quiescent Current | 9µA from VIN at 12VIN→5VOUT; 0.3µA shutdown - enables >10-year battery life in always-on monitoring nodes. |
| Feedback Voltage | 1.202V ±24mV - sets precise output regulation; line regulation <10m%/V ensures stability across input transients. |
| Switching Frequency | 250kHz–1.5MHz via RT resistor - allows optimization of size (high f) vs. efficiency (low f) and EMI compliance. |
| Reset Timeout (tRST) | 8.5–11.85ms with CPOR = 4.7nF - provides reliable microcontroller initialization window after power-on or fault recovery. |
| Watchdog Boundaries | tWDL = 580–812µs, tWDU = 14.9–20.9ms with CWDT = 1nF - defines safe timing window for MCU watchdog pulses without false triggers. |
| UVLO Thresholds | SWEN rising: 0.9–1.1V; RSTIN: 86–97% of 1.202V FB reference - enables flexible, resistor-divider-programmable input supervision. |
Pinout & Package
LT8495IFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE grade) with exposed pad (Pin 21) soldered to PCB ground for thermal and electrical integrity. θJA = 38°C/W. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (BIAS) | Secondary supply input | Enables operation from output rail when VIN drops <2.5V; auto-selects lower-voltage source with VIN for NPN drive. |
| Pin 2,3 (FB) | Output voltage feedback | Regulates to 1.202V; connects to resistor divider to set VOUT; bias current <20nA minimizes divider error. |
| Pin 5 (RSTIN) | Reset input reference | Compares to internal 1.1V ref; asserts RST low when voltage falls below threshold - used for input UVLO. |
| Pin 6 (SWEN) | Switch enable detect | Enables/disables regulator and soft-start; 0.9–1.1V rising threshold with 30mV hysteresis for clean turn-on. |
| Pin 7 (WDE) | Watchdog enable | Drives >1.1V to activate watchdog logic; low disables WDO output (high-Z state). |
| Pin 8 (WDO) | Watchdog output | Active-low open-drain; pulses low on WDI timing violation for tRST duration set by CPOR. |
| Pin 11 (RST) | Power-on reset output | Active-low open-drain; asserted low during startup, UVLO, or fault; held for CPOR-programmed tRST. |
| Pin 12 (SW) | Internal switch collector | Connects to external inductor/diode; 70V rating supports high-input SEPIC/boost; minimize trace area for EMI control. |
| Pin 16 (VIN) | Main supply input | Accepts up to 60V for SEPIC; up to 32V for boost/flyback (with 60V ride-through); bypass locally. |
| Pin 18 (CPOR) | Reset delay capacitor | Capacitor to GND sets tRST (8.5–11.85ms typ. with 4.7nF); determines minimum reset pulse width. |
| Pin 19 (CWDT) | Watchdog timing capacitor | Capacitor to GND sets tWDL/tWDU (580–812µs / 14.9–20.9ms typ. with 1nF); defines watchdog window boundaries. |
| Pin 20 (SS) | Soft-start capacitor | Capacitor to GND controls ramp rate of VC; integrated 256k pull-up charges SS to ~2.1V for controlled startup. |
| Pin 21 (GND) | Ground / Exposed pad | All GND pins and exposed pad must be soldered to local ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-fault-tolerant TSSOP | Adjacent pin shorts or opens cannot raise output voltage above programmed value - meets ASIL-B functional safety requirements. |
| Low-ripple Burst Mode | Maintains <10mV output ripple at light loads while reducing quiescent current to <9µA - eliminates need for post-regulation LDOs. |
| Dual-supply automatic selection | VIN/BIAS pins allow seamless transition to BIAS supply when VIN drops below 2.5V - extends runtime in brownout conditions. |
| Independent capacitor-programmed timers | CPOR sets RST pulse width; CWDT sets watchdog window - no external ICs or complex logic required. |
| Programmable UVLO on SWEN/RSTIN | Resistor dividers on SWEN (enable) and RSTIN (reset) provide user-defined input supervision thresholds. |
Applications
| Automotive ECU Power | Portable Medical Monitor Supply |
|---|---|
Use Scenario: Powers infotainment and ADAS ECUs from 12V battery with cold-crank (4.5V) and load-dump (60V) resilience. IC Role / Device Role / Timing Role: SEPIC controller providing regulated 5V/3.3V rails; POR ensures MCU reset during ignition cycles; watchdog monitors firmware execution. Use Value: Dual-supply operation maintains regulation during cranking dips; 9µA IQ extends sleep-mode battery life; FMEA tolerance prevents overvoltage faults. | Use Scenario: Powers handheld glucose meters and pulse oximeters from single-cell Li-ion (3.0–4.2V) with multi-year shelf life. IC Role / Device Role / Timing Role: Boost converter generating 5V from battery; low-ripple Burst Mode delivers stable sensor bias; CPOR-programmed RST guarantees clean boot. Use Value: 0.3µA shutdown current enables >10-year shelf life; <10mV ripple avoids ADC noise; compact TSSOP fits space-constrained PCBs. |
| Industrial Sensor Node | Smart Meter Auxiliary Rail |
Use Scenario: Supplies wireless sensor nodes in utility metering or predictive maintenance systems powered by energy harvesters or coin cells. IC Role / Device Role / Timing Role: SEPIC topology accepts variable input (1–60V) from solar, thermoelectric, or AC-DC sources; watchdog validates MCU health between transmissions. Use Value: Wide 1V–60V input range accommodates diverse energy sources; programmable tWDU/tWDL adapts to varying MCU wake intervals; 20-lead TSSOP simplifies automated assembly. | Use Scenario: Generates isolated auxiliary 3.3V rail for metrology ICs and RF modules in smart electricity meters with 220VAC input. IC Role / Device Role / Timing Role: Flyback controller with primary-side sensing; RSTIN-based UVLO protects against mains brownouts; WDO resets communication stack on timeout. Use Value: 70V switch rating withstands 60V reflected spikes; tRST ≥8.5ms ensures full metrology calibration before data transmission; BIAS pin enables efficient auxiliary rail sourcing. |
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#TRPBF | Higher 60V input rating, 5A switch, but no integrated watchdog timer or CPOR/CWDT timing; requires external reset IC. | Targeted at high-current industrial supplies where watchdog functionality is handled separately. | Select when >2A output current is required and external supervision ICs are acceptable. |
| MAX16922ATP+T | Automotive-qualified 40V buck controller with integrated watchdog and reset, but fixed 2.2MHz frequency and no SEPIC/boost topology support. | Optimized for 5V/3.3V automotive body electronics with strict AEC-Q100 requirements. | Select for AEC-Q100-compliant 12V-to-5V conversion where topology flexibility is secondary to qualification. |
Compared with LTC3895EFE#TRPBF and MAX16922ATP+T, the LT8495IFE#TRPBF uniquely combines SEPIC/boost/flyback topology support, ultra-low 9µA quiescent current, and fully integrated capacitor-programmable POR/watchdog - making it optimal for battery-sensitive, multi-topology, and functional-safety-aware designs where external components must be minimized.
Availability
LT8495IFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical monitor supplies, and industrial sensor node applications requiring stable component supply, long-term lifecycle assurance, and guaranteed -40°C to +125°C operation.
Supply support for LT8495IFE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8495IFE#TRPBF belongs to Linear's high-reliability power controller family designed for mission-critical applications demanding ultra-low IQ, integrated system supervision, and fault-tolerant operation across extreme input voltage ranges.
FAQ
What is the maximum input voltage supported by the LT8495IFE#TRPBF in SEPIC topology?
The LT8495IFE#TRPBF supports up to 60V input voltage in SEPIC configuration, as specified in Absolute Maximum Ratings and confirmed in Applications Information. This enables direct connection to 48V industrial buses or automotive load-dump transients without external clamping. The 70V-rated internal NPN switch provides sufficient margin for transient overshoots. Operation remains within safe limits as long as VIN does not exceed 60V continuously.
How does the LT8495IFE#TRPBF achieve 0.3µA shutdown current?
The LT8495IFE#TRPBF achieves ~0.3µA shutdown current when SWEN, WDE, and RSTIN are all held low, disabling all internal circuitry including oscillator, error amplifier, and gate drivers. This ultra-low state draws minimal leakage from both VIN and BIAS pins - verified in Electrical Characteristics tables across temperature. The design isolates bias networks and uses deep-sleep transistor sizing to minimize subthreshold conduction, enabling decade-long battery operation in always-connected IoT sensors.
Can the LT8495IFE#TRPBF operate with VIN below 2.5V after startup?
Yes - the LT8495IFE#TRPBF can continue operating with VIN as low as ~1V after startup by drawing power from the BIAS pin, which is typically connected to the output rail. This dual-supply architecture is explicitly documented in Features and Applications Information. When VIN drops below 2.5V, the internal supply selector automatically switches NPN base drive to BIAS, maintaining regulation until BIAS itself falls below its minimum operating voltage (~2.4V). This behavior extends battery life in brownout scenarios.
What is the purpose of the NC pins on the LT8495IFE#TRPBF TSSOP package?
The NC pins (Pins 4, 9, 17, 19) on the LT8495IFE#TRPBF TSSOP package are unconnected internally and must be left floating to preserve FMEA fault tolerance. As stated in PIN FUNCTIONS, leaving them unconnected ensures that adjacent pin shorts or opens cannot cause unintended output overvoltage - a critical safety feature for automotive and industrial use. Soldering or routing to ground/voltage violates the fault-tolerant design and may compromise reliability.
How is the watchdog timeout period adjusted on the LT8495IFE#TRPBF?
The watchdog upper (tWDU) and lower (tWDL) timeout boundaries on the LT8495IFE#TRPBF are set by capacitor CWDT connected from Pin 19 to GND. With CWDT = 1nF, tWDU = 14.9–20.9ms and tWDL = 580–812µs, as specified in Electrical Characteristics. The relationship is linear: doubling CWDT doubles both boundaries. This capacitor-programmable method eliminates external timing ICs and allows precise tuning to match MCU watchdog pulse intervals without firmware changes.
LT8495IFE#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, 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8495IFE#TRPBF FAQ
1.How can I place an order for LT8495IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8495IFE#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 LT8495IFE#TRPBF reliable?
The price and inventory of LT8495IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8495IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8495IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8495IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8495IFE#TRPBF?
LT8495IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8495IFE#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 LT8495IFE#TRPBF?
For technical support, including LT8495IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8495IFE#TRPBF requirements.
6.How does Aetrix verify that LT8495IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8495IFE#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 LT8495IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8495IFE#TRPBF?
All LT8495IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8495IFE#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 LT8495IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8495IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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