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Analog Devices Inc. LT8495EFE#TRPBF
- Part No.:
- LT8495EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8495EFE#TRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,844
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Product details
Overview
LT8495EFE#TRPBF from Analog Devices is a monolithic SEPIC/boost/flyback DC/DC controller with integrated 2A/70V NPN power switch, programmable 250kHz–1.5MHz switching frequency, 9µA quiescent current in active operation, and independent power-on reset (tRST = 8.5–11.85ms) and watchdog timer (tWDL = 580–812µs, tWDU = 14.9–20.9ms). It operates across 1V–60V input range and supports battery-powered automotive ECU and portable industrial supplies.
For engineers reviewing the LT8495EFE#TRPBF datasheet, LT8495EFE#TRPBF pinout, LT8495EFE#TRPBF application, or LT8495EFE#TRPBF equivalent, key selection criteria include its dual-supply (VIN/BIAS) architecture enabling sub-2.5V operation after startup, FMEA-fault-tolerant TSSOP package, low-ripple Burst Mode® (<10mV output ripple), and independently programmable POR/watchdog timing via CPOR/CWDT capacitors.
Technical Context
The LT8495EFE#TRPBF implements constant-frequency current-mode control with adjustable oscillator (RT pin), quadratic ramp compensation, and active clamp VC limiter for precise current limiting across duty cycles. Its supply-select logic automatically routes base drive to the internal NPN switch from the lower-voltage of VIN or BIAS-enabling operation down to ~1V after startup when BIAS sustains regulation.
Burst Mode® operation shuts down all switching control circuitry between pulses, reducing VIN/BIAS quiescent current to ≤3.1µA (E-grade) while maintaining <10mV output ripple via controlled single-cycle energy bursts. The integrated POR and watchdog use capacitor-programmed RC timers (CPOR, CWDT) with separate thresholds and hysteresis on RSTIN, WDE, and WDI pins for deterministic fault response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | SEPIC, boost, or flyback-configurable via external component selection; no topology change required in IC design. |
| Switch Rating | Integrated 2A/70V NPN power switch-eliminates external high-voltage transistor and reduces BOM count. |
| Quiescent Current | 9µA at 12VIN→5VOUT; drops to 0.3µA in shutdown-enables >10-year battery life in always-on monitoring systems. |
| Input Voltage Range | 1V–60V (SEPIC), 2.5V–32V start-up (boost/flyback) with 60V ride-through-supports wide-range industrial and automotive inputs. |
| Feedback Reference | 1.202V ±24mV over –40°C to 125°C-ensures stable output regulation across temperature without external trimming. |
| Watchdog Timing | Programmable tWDL = 580–812µs and tWDU = 14.9–20.9ms via CWDT capacitor-provides precise windowed supervision for microcontroller health. |
| POR Delay | tRST = 8.5–11.85ms set by CPOR capacitor-guarantees clean system reset after power stabilization. |
Pinout & Package
LT8495EFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 21 = GND), rated for –40°C to 125°C junction temperature and θJA = 38°C/W. All NC pins (4, 9, 17, 19) must remain unconnected to preserve FMEA fault tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (BIAS) | Secondary supply input | Enables operation below 2.5V after startup; auto-selects lower-voltage rail (VIN or BIAS) for NPN base drive. |
| Pin 2,3 (FB) | Output voltage feedback | Senses regulated output via resistor divider; internal 1.202V reference sets VOUT = 1.202V × (1 + R1/R2). |
| Pin 5 (RSTIN) | Reset input reference | Compares external divider voltage to 1.1V internal reference; asserts RST low if input falls below threshold. |
| Pin 6 (SWEN) | Switch enable detect | UVLO control input; rising threshold = 1V ±0.1V; enables soft-start and regulator only above threshold. |
| Pin 7 (WDE) | Watchdog enable | Active-high logic input; drives WDO low only when WDE ≥ 1.1V and WDI signal violates programmed window. |
| Pin 8 (RST) | Open-drain reset output | Asserts low for tRST after RSTIN undervoltage or watchdog timeout; sinks 1.25mA max at ≤150mV. |
| Pin 10 (VIN) | Main supply input | Primary power source up to 60V; bypassed locally; supplies control circuitry when BIAS < 2.5V. |
| Pin 12 (SW) | Switch collector node | Connects to external inductor/diode; handles 70V peak voltage and 2.55A peak switch current. |
| Pin 15 (WDO) | Watchdog output | Open-drain active-low output; pulses low for tRST duration upon watchdog violation; requires external pull-up. |
| Pin 16 (WDI) | Watchdog input | Receives microcontroller strobe signal; detects missing or mistimed edges to trigger WDO assertion. |
| Pin 18 (CPOR) | POR/reset delay timing | Capacitor-to-GND sets tRST (8.5–11.85ms); determines minimum reset pulse width after power-up or fault. |
| Pin 19 (CWDT) | Watchdog timing | Capacitor-to-GND sets tWDL/tWDU window boundaries; defines acceptable WDI edge interval for supervision. |
| Pin 20 (SS) | Soft-start control | Capacitor-to-GND ramps internal soft-start voltage; controls inrush current and output voltage slew rate. |
| Pin 21 (GND) | Power/thermal ground | Exposed pad and multiple pins connect to PCB ground plane; mandatory soldering ensures thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA-fault-tolerant TSSOP | Adjacent pin shorts or opens cannot raise output voltage beyond regulation-critical for safety-critical automotive ECUs. |
| Dual-supply operation (VIN/BIAS) | Extends functional runtime below 2.5V after startup by drawing bias from regulated output-ideal for battery-depleted scenarios. |
| Low-ripple Burst Mode® | Maintains <10mV output ripple at light loads while achieving ≤9µA quiescent current-enables ultra-low-power sensor nodes. |
| Independent POR and watchdog timers | Separate CPOR and CWDT capacitors allow decoupled reset hold time and supervision window tuning-no shared timing constraints. |
| Programmable UVLO on SWEN/RSTIN | Resistor dividers set turn-on thresholds independently for regulator enable and system reset-supports multi-rail sequencing. |
| Frequency foldback at light load | Reduces switching frequency when FB < 1V during startup-improves controllability and prevents instability at low duty cycles. |
Applications
| Automotive Engine Control Unit (ECU) Power | Portable Medical Monitoring Device |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and analog sensors in under-hood ECU with 8V–16V battery input and cold-crank dips to 3V. IC Role / Device Role / Timing Role: SEPIC controller providing stable 5V/1A output; POR ensures clean MCU boot after ignition; watchdog supervises firmware execution. Use Value: Dual-supply operation maintains regulation during 3V cold-crank; 9µA quiescent current extends battery life during sleep mode. |
Use Scenario: Powers glucose meter or pulse oximeter from single 3V coin cell with multi-year shelf life requirement. IC Role / Device Role / Timing Role: Boost converter generating 3.3V from 2.2V–3.0V battery; Burst Mode® minimizes no-load current; RSTIN monitors battery voltage. Use Value: Sub-1µA shutdown current and <10mV ripple enable clinical-grade accuracy and >5-year battery life. |
| Industrial IoT Sensor Node | Railway Signaling Interface Supply |
Use Scenario: Powers LoRaWAN node in remote pipeline monitor with 12V–48V DC input and -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Boost converter delivering 5V/0.6A; programmable tRST ensures reliable MCU reset after brownout; TSSOP package withstands vibration. Use Value: 60V input rating and -40°C to 125°C operation support harsh environments; FMEA tolerance prevents overvoltage faults. |
Use Scenario: Supplies 24V logic interface in track-side signaling cabinet with 72V nominal DC rail and transient surges. IC Role / Device Role / Timing Role: SEPIC regulator accepting 36V–75V input; watchdog monitors PLC communication; CPOR sets fail-safe reset delay. Use Value: 70V switch rating and 60V absolute max input handle railway transients; independent watchdog prevents stuck states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3895EFE#TRPBF | Higher 60V input rating, 10A external MOSFET drive, no integrated switch; requires external gate drivers and sense resistors. | Targets higher-power (>10A) industrial supplies where efficiency >95% at full load is critical; lacks integrated watchdog/POR. | Select LTC3895EFE#TRPBF when output current exceeds 2A or when discrete FET optimization is needed; not drop-in for LT8495EFE#TRPBF. |
| LT3999EMSE#TRPBF | Fixed 2MHz frequency, 3A/60V integrated switch, no BIAS pin or watchdog; Burst Mode® only, no frequency programming. | Optimized for compact space-constrained designs (e.g., LED drivers) requiring minimal external components; no POR or supervision features. | Select LT3999EMSE#TRPBF for simple boost applications without system-level supervision; lacks RSTIN/WDE/WDI functionality. |
Compared with LTC3895EFE#TRPBF and LT3999EMSE#TRPBF, the LT8495EFE#TRPBF uniquely integrates a 2A/70V switch, dual-supply operation, and independent POR/watchdog timers-making it optimal for battery-backed, safety-monitored, wide-input industrial and automotive power rails.
Availability
LT8495EFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical monitoring devices, and industrial IoT sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8495EFE#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 LT8495EFE#TRPBF belongs to Linear's high-reliability power controller product line, designed specifically for safety-critical and battery-sensitive applications requiring integrated supervision, ultra-low quiescent current, and wide-input operation.
FAQ
What is the maximum input voltage supported by the LT8495EFE#TRPBF in SEPIC topology?
The LT8495EFE#TRPBF supports up to 60V input voltage in SEPIC topology, as specified in Absolute Maximum Ratings and confirmed in Applications Information. This rating applies regardless of operating temperature and is validated for continuous operation-not just transient spikes. The internal 70V-rated NPN switch provides margin for safe operation at this 60V limit. Always observe derating guidelines for sustained high-temperature conditions.
How does the LT8495EFE#TRPBF achieve 9µA quiescent current while maintaining low output ripple?
The LT8495EFE#TRPBF achieves 9µA quiescent current through low-ripple Burst Mode® operation: it delivers single-switching-cycle energy bursts followed by deep-sleep intervals where most internal circuitry is powered down. Output ripple remains <10mV because each burst precisely replenishes capacitor charge, and ripple amplitude scales inversely with output capacitance-verified in Typical Performance Characteristics (Figure G04/G06).
Can the LT8495EFE#TRPBF operate with VIN below 2.5V after startup?
Yes-the LT8495EFE#TRPBF can operate with VIN as low as ~1V after startup by drawing bias current from the BIAS pin, which connects to the regulated output. This dual-supply architecture is explicitly documented in Features and Electrical Characteristics: when VIN drops below 2.5V, the internal supply-select logic automatically switches NPN base drive to BIAS, sustaining regulation without interruption.
What is the function of Pin 21 on the LT8495EFE#TRPBF TSSOP package?
Pin 21 on the LT8495EFE#TRPBF is the exposed thermal pad, electrically connected to GND. Per Absolute Maximum Ratings and Pin Configuration diagrams, it must be soldered directly to the PCB ground plane to ensure both electrical integrity and thermal performance (θJA = 38°C/W). Leaving it unconnected degrades thermal dissipation and risks exceeding junction temperature limits under load.
How are the power-on reset and watchdog timeout periods programmed on the LT8495EFE#TRPBF?
The power-on reset period (tRST = 8.5–11.85ms) is programmed using an external capacitor on CPOR (Pin 18), while the watchdog upper/lower boundaries (tWDU = 14.9–20.9ms, tWDL = 580–812µs) are set via CWDT (Pin 19). These relationships are defined in Electrical Characteristics (Note 8) and verified in Typical Performance Characteristics (Figures G19–G22); exact values scale linearly with capacitor value.
LT8495EFE#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
LT8495EFE#TRPBF FAQ
1.How can I place an order for LT8495EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8495EFE#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 LT8495EFE#TRPBF reliable?
The price and inventory of LT8495EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8495EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8495EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8495EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8495EFE#TRPBF?
LT8495EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8495EFE#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 LT8495EFE#TRPBF?
For technical support, including LT8495EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8495EFE#TRPBF requirements.
6.How does Aetrix verify that LT8495EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8495EFE#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 LT8495EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8495EFE#TRPBF?
All LT8495EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8495EFE#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 LT8495EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8495EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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