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Analog Devices Inc. LT8495EUF#TRPBF
- Part No.:
- LT8495EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8495EUF#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
LT8495EUF#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 = 9.5ms typ.) and watchdog timer (tWDU = 16.7ms typ.) functions. It operates across 1V–60V input range and supports battery-powered automotive ECU and portable industrial supplies.
For engineers reviewing the LT8495EUF#TRPBF datasheet, LT8495EUF#TRPBF pinout, LT8495EUF#TRPBF application, or LT8495EUF#TRPBF equivalent, key selection criteria include dual-supply operation (VIN/BIAS), fault-tolerant TSSOP/QFN packaging, low-ripple Burst Mode® efficiency at microamp loads, and capacitor-programmable timing for POR/watchdog.
Technical Context
The LT8495EUF#TRPBF implements constant-frequency current-mode control with adjustable oscillator (RT pin), quadratic ramp compensation, and active clamp-based current limiting. Its dual-supply architecture automatically selects the lower-voltage source (VIN or BIAS) to drive the NPN switch base, enabling operation down to ~1V after startup when BIAS sustains regulation.
Burst Mode® operation reduces no-load supply current to ≤3.1µA (VIN) and ≤6.0µA (BIAS) while maintaining <10mV output ripple via single-cycle energy bursts. The integrated POR and watchdog use external capacitors (CPOR/CWDT) to set tRST, tWDU, and tWDL with ±10% tolerance over –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 2A continuous, 70V VCE(SAT) = 340mV @ 1.2A - enables high-efficiency SEPIC/boost up to 60V input |
| Quiescent Current | 9µA @ 12VIN→5VOUT - extends battery life in always-on portable systems |
| Input Voltage Range | 1V–60V (SEPIC), 2.5V–32V (boost/flyback) - supports wide-range industrial and automotive inputs |
| Feedback Reference | 1.202V ±24mV - sets precise output voltage with resistor divider; line regulation ≤10m%/V |
| Switching Frequency | 250kHz–1.5MHz (RT-programmable) - balances EMI, size, and efficiency for compact designs |
| Reset Timeout | tRST = 9.5ms typ. (CPOR = 4.7nF) - ensures reliable microcontroller initialization after power-up |
| Watchdog Window | tWDU = 16.7ms / tWDL = 650µs (CWDT = 1nF) - detects MCU lockup or timing violations |
Pinout & Package
LT8495EUF#TRPBF uses a 20-lead (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND). Pin assignments are validated per Linear Technology (Analog Devices) datasheet Rev. FB, pages 2 and 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Power Switch Collector | Connects to external inductor/diode; handles 70V transient, requires minimal trace area for EMI control |
| VIN | Main Input Supply | Accepts 1V–60V; powers internal circuitry during startup; bypassed locally with ceramic capacitor |
| BIAS | Secondary Supply Input | Enables operation below 2.5V VIN; draws current from output rail to sustain regulation during brownout |
| FB | Output Voltage Feedback | Regulates to 1.202V; connects to resistor divider for precise output setting; bias current ≤20nA |
| RSTIN | Reset Input Reference | Compares to 1.1V internal reference; asserts RST low when voltage drops below threshold (e.g., UVLO) |
| SWEN | Switch Enable Control | UVLO programmable via resistor divider; rising threshold = 1V ±100mV; disables regulator when low |
| WDE | Watchdog Enable | Active-high logic input; enables WDO monitoring of WDI pulses; hysteresis = 30mV |
| WDI | Watchdog Timer Input | Accepts negative-edge-triggered pulses; pulse width ≥300ns; failure causes WDO low pulse for tRST |
| RST | Open-Drain Reset Output | Asserts low for tRST after RSTIN undervoltage or power-up; sinks 1.25mA @ ≤150mV |
| WDO | Open-Drain Watchdog Output | Active-low fault indicator; pulses low on WDI timeout; sinks 1.25mA @ ≤420mV |
| SS | Soft-Start Timing | Charged by 256kΩ internal resistor to ~2.1V; external capacitor sets ramp rate (100nF–1µF typical) |
| RT | Oscillator Frequency Set | Resistor-to-GND sets fSW; 68.1kΩ → 1MHz, 324kΩ → 250kHz; minimize stray capacitance |
| CPOR | POR/Reset Delay Capacitor | GND-connected capacitor programs tRST (e.g., 4.7nF → 9.5ms); critical for MCU boot sequencing |
| CWDT | Watchdog Timing Capacitor | GND-connected capacitor sets tWDU/tWDL (e.g., 1nF → 16.7ms/650µs); defines fault detection window |
| GND | Ground Reference | Multiple pins (3,4,11,13,14,15) + exposed pad (21); must be soldered to PCB ground plane for thermal/electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Burst Mode® | Maintains <10mV output ripple at light loads while reducing quiescent current to ≤6µA, enabling multi-year battery life |
| Dual-Supply Operation (VIN/BIAS) | Automatically selects lower-voltage supply to drive NPN base, allowing regulation down to ~1V input after startup |
| Fault-Tolerant Architecture | TSSOP/QFN layout prevents output overvoltage during adjacent-pin shorts or opens - critical for automotive safety compliance |
| Capacitor-Programmable Timing | CPOR and CWDT pins enable precise, temperature-stable POR and watchdog periods without trimming resistors |
| Integrated Power Switch Driver | 70V-rated NPN switch with 340mV VCE(SAT) at 1.2A eliminates external transistor, reducing BOM count and layout complexity |
Applications
| Automotive Engine Control Unit (ECU) Power | Portable Medical Device Supply |
|---|---|
Use Scenario: Powers microcontroller, sensors, and CAN transceivers in 12V vehicle electrical systems with cold-crank (≤4.5V) and load-dump (≤60V) transients. IC Role / Device Role / Timing Role: Primary DC/DC controller providing stable 5V/3.3V rails; POR ensures MCU reset during ignition; watchdog monitors firmware execution. Use Value: Dual-supply operation maintains regulation during cranking; 9µA quiescent current prevents battery drain during sleep mode. | Use Scenario: Supplies ultra-low-power wearable diagnostics with lithium coin-cell or rechargeable battery input. IC Role / Device Role / Timing Role: SEPIC converter delivering regulated output from 2.0V–3.6V battery; Burst Mode® extends runtime; soft-start prevents inrush into sensitive analog circuits. Use Value: 1V minimum operating voltage after startup enables full discharge of Li-MnO₂ cells; <10mV ripple avoids noise coupling into ECG/PPG signal chains. |
| Industrial Sensor Node Power | Smart Meter Auxiliary Supply |
Use Scenario: Powers LoRaWAN or NB-IoT sensor nodes deployed in remote locations with primary alkaline or lithium-thionyl-chloride batteries. IC Role / Device Role / Timing Role: Boost converter generating 3.3V from 1.8V–3.6V input; programmable UVLO on SWEN prevents operation below safe battery voltage. Use Value: 0.3µA shutdown current (all enables low) maximizes shelf life; capacitor-programmed watchdog replaces discrete timers, saving board space. | Use Scenario: Provides isolated auxiliary power for metrology ICs and real-time clocks in electricity meters with 120/240V AC input via auxiliary winding. IC Role / Device Role / Timing Role: Flyback controller with BIAS-fed operation; RSTIN monitors main supply rail; CPOR ensures clean RTC initialization after power restoration. Use Value: 60V input rating accommodates flyback transformer leakage spikes; FMEA-tolerant design meets IEC 62052-11 reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EFE#TRPBF | Two-phase synchronous boost controller; no integrated switch; higher 60V input, but requires external MOSFETs | Targeted at higher-current (>5A), lower-quiescent designs where efficiency >95% is critical | Choose LTC3892EFE#TRPBF when output current exceeds 2A or synchronous rectification is required |
| MAX17595ATP+T | 40V-rated boost controller; integrated 0.5Ω high-side MOSFET; fixed 600kHz frequency; no watchdog/POR | Simpler timing-critical applications without system-level fault monitoring | Choose MAX17595ATP+T for cost-sensitive, non-safety-critical boost supplies lacking watchdog requirements |
Compared with LTC3892EFE#TRPBF and MAX17595ATP+T, LT8495EUF#TRPBF uniquely integrates a 70V NPN switch, capacitor-programmable POR/watchdog, and sub-10µA quiescent current - making it optimal for space-constrained, battery-backed, safety-monitored SEPIC/boost systems.
Availability
LT8495EUF#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical device supply, and industrial sensor node applications requiring stable component supply across extended temperature ranges.
Supply support for LT8495EUF#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8495 product line delivers highly integrated DC/DC controllers with embedded safety features (POR, watchdog, fault tolerance) specifically designed for mission-critical power in automotive and portable industrial systems.
FAQ
What is the maximum input voltage supported by the LT8495EUF#TRPBF in SEPIC topology?
The LT8495EUF#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 to both VIN and BIAS pins, enabling robust operation in automotive and industrial environments with high transient voltages. The 70V-rated internal NPN switch provides margin against voltage spikes.
How does the LT8495EUF#TRPBF achieve 9µA quiescent current while maintaining low output ripple?
The LT8495EUF#TRPBF achieves 9µA quiescent current through low-ripple Burst Mode® operation, which delivers single-cycle energy bursts followed by deep-sleep intervals where most internal circuitry is disabled. During sleep, VIN/BIAS supply currents drop to ≤3.1µA/≤6.0µA, while output capacitance sustains load current - keeping ripple <10mV with 47µF output caps.
Can the LT8495EUF#TRPBF operate with input voltage below 2.5V after startup?
Yes, the LT8495EUF#TRPBF can operate with VIN as low as ~1V after startup by drawing current from the BIAS pin, which is typically connected to the output rail. This dual-supply architecture extends battery life in portable applications, as confirmed by Electrical Characteristics showing minimum VIN operating voltage of 2.4V (l) when BIAS < 2.5V.
What external components define the power-on reset timeout period for the LT8495EUF#TRPBF?
The power-on reset timeout period (tRST) for the LT8495EUF#TRPBF is defined solely by the capacitor connected between CPOR pin (Pin 18) and GND. With CPOR = 4.7nF, tRST = 9.5ms typical over –40°C to 125°C, as documented in the Electrical Characteristics table and Timing Diagrams. No resistor is required.
Is the LT8495EUF#TRPBF pin-compatible with other packages in the LT8495 family?
No, the LT8495EUF#TRPBF (20-lead 4mm × 4mm QFN) has different pin assignments than the LT8495EFE#TRPBF (20-lead TSSOP), as shown in the PIN CONFIGURATION diagrams. While both share identical functionality and electrical specs, their pinouts differ - particularly for GND, NC, and feedback connections - requiring separate PCB layouts.
LT8495EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LT8495EUF#TRPBF FAQ
1.How can I place an order for LT8495EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8495EUF#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 LT8495EUF#TRPBF reliable?
The price and inventory of LT8495EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8495EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8495EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8495EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8495EUF#TRPBF?
LT8495EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8495EUF#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 LT8495EUF#TRPBF?
For technical support, including LT8495EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8495EUF#TRPBF requirements.
6.How does Aetrix verify that LT8495EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8495EUF#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 LT8495EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8495EUF#TRPBF?
All LT8495EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8495EUF#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 LT8495EUF#TRPBF part is unused and in its original packaging.
Return procedure for LT8495EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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