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Analog Devices Inc. LT8495EFE#PBF
- Part No.:
- LT8495EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8495EFE#PBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,812
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Product details
Overview
LT8495EFE#PBF 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 dual supply pins (VIN/BIAS) enabling operation down to ~1V after startup. It delivers regulated 5V output at up to 1.0A (VIN >12V) in automotive ECU power supplies.
For engineers reviewing the LT8495EFE#PBF datasheet, LT8495EFE#PBF pinout, LT8495EFE#PBF application, or LT8495EFE#PBF equivalent, key selection criteria include its fault-tolerant TSSOP package, programmable POR/watchdog timing via CPOR/CWDT capacitors, low-ripple Burst Mode operation (<10mV ripple), and dual-supply efficiency optimization for battery-backed systems.
Technical Context
The LT8495EFE#PBF implements constant-frequency current-mode control with adjustable oscillator (RT pin), internal VC limiter for current limiting, and quadratic ramp compensation. Its power switch driver automatically selects between VIN and BIAS for base drive, enabling operation when either supply drops below 2.5V-critical for brownout resilience.
It integrates independent POR (CPOR-programmed tRST = 8.5–11.85ms) and watchdog timer (CWDT-programmed tWDU/tWDL), both functional even when VIN is removed. Fault tolerance in the TSSOP package ensures open or adjacent-pin shorts do not cause overvoltage-verified by internal FMEA design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 70V collector-emitter breakdown; supports 60V SEPIC input or 32V boost/flyback with 60V ride-through. |
| Quiescent Current | 9µA at 12VIN→5VOUT; enables >10-year battery life in always-on portable monitoring systems. |
| Output Ripple | <10mV typical in Burst Mode with 47µF output capacitance-meets low-noise analog supply requirements. |
| Operating Temp Range | –40°C to +125°C junction; qualified for automotive ECU and industrial control environments. |
| Feedback Voltage | 1.202V ±24mV; sets precise output regulation via external resistor divider (e.g., 5.0V @ R1=100kΩ, R2=30.9kΩ). |
| Minimum On/Off Time | 95ns / 70ns; enables stable operation at high duty cycles and high input-to-output ratios. |
| UVLO Thresholds | SWEN rising threshold = 1.0V ±0.1V; RSTIN threshold = 92% of FB voltage (≈1.11V); supports robust undervoltage detection. |
Pinout & Package
LT8495EFE#PBF uses a 20-lead plastic TSSOP package with exposed pad (Pin 21 = GND), θJA = 38°C/W. All GND pins (3,4,11,13,14,15) and exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. NC pins (4,9,17,19) are unconnected and must remain floating to preserve fault tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (Pin 1) | Secondary supply input | Enables operation when VIN drops below 2.5V; draws current from output rail to sustain regulation during battery brownout. |
| FB (Pins 2,3) | Output voltage feedback | Regulates FB to 1.202V; determines output voltage via resistor divider; bias current <20nA minimizes divider error. |
| CPOR (Pin 5) | POR/reset delay timing | Capacitor sets tRST (8.5–11.85ms); controls minimum RST assertion time after power-up or RSTIN recovery. |
| CWDT (Pin 6) | Watchdog timing | Capacitor sets tWDU (14.9–20.9ms) and tWDL (580–812µs); defines watchdog window for microcontroller supervision. |
| RST (Pin 7) | Open-drain reset output | Asserts low when RSTIN <1.1V or during POR; sinks 1.25mA at <150mV-directly drives MCU reset inputs. |
| SWEN (Pin 12) | Switch enable control | UVLO threshold = 1.0V; resistor divider enables programmable input undervoltage lockout before startup. |
| SW (Pin 20) | Power switch collector | Connects to external inductor/diode; 70V rating supports wide input ranges; minimize trace area to reduce EMI. |
| GND (Pins 3,4,11,13,14,15 + Exposed Pad 21) | Ground reference | All GND connections must tie to local PCB ground plane; exposed pad is electrically and thermally GND. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-tolerant TSSOP layout | Adjacent-pin shorts or opens cannot raise output voltage above regulation-validated per FMEA analysis. |
| Low-ripple Burst Mode | Maintains <10mV output ripple at light loads while reducing IQ to <9µA-ideal for battery-powered sensors. |
| Dual-supply auto-selection | VIN/BIAS comparator selects lower-voltage source for NPN base drive, extending runtime when VIN sags. |
| Programmable watchdog & POR | Independent CPOR/CWDT capacitors set reset delay (tRST) and watchdog window (tWDU/tWDL) without firmware. |
| Frequency foldback | Reduces switching frequency when FB <1V-improves start-up control and prevents current limit instability. |
Applications
| Automotive ECU Power | Portable Medical Monitor |
|---|---|
|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit with 6V–16V battery input and load dump transients. IC Role / Device Role / Timing Role: SEPIC controller providing isolated 5V/1A output; POR asserts reset during cold-crank (≤2.5V) and watchdog supervises MCU execution. Use Value: Dual-supply operation maintains regulation during cranking; 70V switch withstands 60V load dump; fault-tolerant TSSOP prevents overvoltage failure. |
Use Scenario: Supplies 3.3V/500mA to low-power ARM Cortex-M4 and ECG front-end in handheld patient monitor with Li-ion battery. IC Role / Device Role / Timing Role: Boost converter with BIAS-connected output; Burst Mode extends battery life; programmable WDE/WDI monitors firmware health. Use Value: 9µA IQ enables multi-week standby; <10mV ripple avoids noise coupling into analog signal chain; CPOR-set tRST ensures reliable boot. |
| Industrial IoT Sensor Node | Smart Meter Backup Supply |
|
Use Scenario: Powers LoRaWAN radio and temperature/humidity sensor from 3.6V primary lithium battery with 10-year lifetime requirement. IC Role / Device Role / Timing Role: SEPIC regulator delivering 3.3V; SWEN-based UVLO disables converter below 2.4V to prevent deep discharge. Use Value: Sub-10µA quiescent current minimizes self-discharge; soft-start (SS pin) prevents inrush into large supercapacitor buffer. |
Use Scenario: Provides 5V backup to real-time clock and memory during AC mains failure in electricity meter using supercapacitor storage. IC Role / Device Role / Timing Role: Boost converter operating from 2.5V–5.5V supercapacitor; RSTIN monitors capacitor voltage to trigger controlled shutdown. Use Value: BIAS pin operation sustains regulation as supercapacitor discharges to 1V; RST assertion alerts host before data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SEPIC/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3589EUF#PBF | Integrated 4-channel buck regulator with I²C interface; no integrated high-voltage switch; max VIN = 20V. | Requires external MOSFET for >20V input; lacks watchdog/POR; suited for multi-rail digital systems, not high-voltage analog supplies. | Select when system needs programmable sequencing and I²C telemetry-not for standalone high-voltage, low-IQ power. |
| MAX17595ATP+T | 4A/100V current-mode controller; no integrated switch; requires external N-channel MOSFET; IQ = 2.5mA. | Higher peak current capability but 278× higher quiescent current; no BIAS pin or fault-tolerant packaging. | Select for high-current industrial supplies where IQ is secondary to power density-not for battery longevity or automotive safety. |
Compared with LTC3589EUF#PBF and MAX17595ATP+T, the LT8495EFE#PBF uniquely combines integrated 70V/2A switch, sub-10µA IQ, dual-supply operation, and fault-tolerant TSSOP-making it optimal for space-constrained, long-life, high-reliability SEPIC/boost designs.
Availability
LT8495EFE#PBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical monitors, industrial IoT sensor nodes, and smart meter backup supplies requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LT8495EFE#PBF 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 LT8495EFE#PBF belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency, high-reliability DC/DC controllers designed for demanding automotive and industrial applications where input voltage range, quiescent current, and functional safety are critical.
FAQ
What is the maximum input voltage supported by the LT8495EFE#PBF in SEPIC topology?
The LT8495EFE#PBF supports up to 60V input in SEPIC configuration, as specified in Absolute Maximum Ratings and confirmed in Applications Information. This allows direct connection to 48V industrial buses or automotive load-dump scenarios without external clamping. The 70V-rated internal NPN switch provides sufficient margin for transient overvoltage events. Operation remains within specification up to 60V VIN with appropriate external components rated for the full stress.
How does the LT8495EFE#PBF achieve 9µA quiescent current?
The LT8495EFE#PBF achieves 9µA quiescent current through multiple design features: low-power Burst Mode operation that shuts down control circuitry between switching bursts, optimized bias networks with sub-20nA FB pin current, and dynamic supply selection (VIN/BIAS) that minimizes base drive losses. This value is measured at 12VIN → 5VOUT under light-load conditions and is guaranteed across the –40°C to 125°C operating range per Electrical Characteristics table.
Can the LT8495EFE#PBF operate with VIN below 2.5V after startup?
Yes-the LT8495EFE#PBF can operate with VIN as low as ~1V after startup by drawing power from the BIAS pin connected to the output rail. This is enabled by the internal supply-select logic that routes base drive current from whichever of VIN or BIAS is at lower voltage, provided it remains within 2.4V–34V. When VIN drops below 2.4V, BIAS automatically becomes the primary supply, extending battery life in brownout conditions without interrupting regulation.
What is the function of the NC pins on the LT8495EFE#PBF TSSOP package?
The NC pins (4, 9, 17, 19) on the LT8495EFE#PBF TSSOP package are internally unconnected and serve a critical fault-tolerance role: leaving them floating ensures that adjacent-pin shorts or opens cannot create unintended current paths or alter regulation. This design is verified per FMEA analysis and explicitly required in the datasheet-connecting or routing these pins risks compromising the device's overvoltage protection guarantee and may cause output overregulation.
How is the watchdog timeout period programmed on the LT8495EFE#PBF?
The watchdog timeout period on the LT8495EFE#PBF is programmed using an external capacitor on the CWDT pin (Pin 6). With CWDT = 1000pF, the upper boundary (tWDU) is 14.9–20.9ms and lower boundary (tWDL) is 580–812µs, as specified in Electrical Characteristics. These periods scale linearly with capacitance-doubling CWDT doubles both boundaries. The watchdog requires periodic WDI pin toggling within this window to prevent WDO assertion; no resistor or other component is needed beyond the capacitor.
LT8495EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8495EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8495EFE#PBF 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#PBF reliable?
The price and inventory of LT8495EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8495EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8495EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8495EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8495EFE#PBF?
LT8495EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8495EFE#PBF 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#PBF?
For technical support, including LT8495EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8495EFE#PBF requirements.
6.How does Aetrix verify that LT8495EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8495EFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8495EFE#PBF?
All LT8495EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8495EFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8495EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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