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Analog Devices Inc. LT8494EFE#PBF
- Part No.:
- LT8494EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8494EFE#PBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:357
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Product details
Overview
LT8494EFE#PBF from Analog Devices is a monolithic SEPIC/boost/flyback DC/DC controller with integrated 2A/70V NPN power switch, 250kHz–1.5MHz adjustable switching frequency, 7µA quiescent current in active operation, and dual supply pins (VIN/BIAS) enabling operation down to ~1V after startup-designed for battery-powered industrial and automotive ECU supplies.
For engineers reviewing the LT8494EFE#PBF datasheet, LT8494EFE#PBF pinout, LT8494EFE#PBF application, or LT8494EFE#PBF equivalent, key selection considerations include its FMEA-fault-tolerant TSSOP package, programmable UVLO via SWEN pin, low-ripple Burst Mode operation (<10mV ripple), and 70V switch rating supporting 60V SEPIC input.
Technical Context
The LT8494EFE#PBF implements constant-frequency current-mode control with internal slope compensation, frequency foldback below 1V FB, and soft-start via external capacitor on SS pin. Its dual-supply architecture automatically selects between VIN and BIAS for NPN base drive, sustaining regulation even when VIN drops below 2.5V post-startup.
It integrates a power-good comparator (92% FB threshold), programmable oscillator (RT pin), and fault-tolerant logic in the 20-lead TSSOP package-where specific NC pins must remain floating to maintain FMEA compliance and prevent overvoltage during adjacent-pin shorts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | SEPIC, boost, or flyback-enables single-chip solutions for wide-input-range isolated/non-isolated conversion |
| Max Input Voltage | 60V for SEPIC; 32V (with 60V ride-through) for boost/flyback-supports 48V industrial and automotive battery systems |
| Quiescent Current | 7µA at VIN=12V→5V; 0.3µA shutdown-extends battery life in always-on portable and telematics applications |
| Switch Rating | 2A peak, 70V VCE(SAT) = 340mV @ 1.2A-handles high-voltage transients without external clamp diodes |
| Feedback Voltage | 1.202V ±24mV-sets precise output regulation with minimal divider current impact on light-load efficiency |
| PG Threshold | 92% of FB voltage-provides reliable power-good signaling even under low-VIN conditions (down to 1.3V) |
| Min Switch On/Off Time | 95ns / 70ns-enables stable operation at high duty cycles and high frequencies up to 1.5MHz |
Pinout & Package
The LT8494EFE#PBF is housed in a 20-lead plastic TSSOP package (FE) with exposed pad (Pin 21) soldered to GND for thermal and electrical integrity. θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BIAS) | Secondary supply input | Enables automatic supply selection; sustains regulation when VIN < 2.5V by drawing from VOUT |
| 2,3 (FB) | Output voltage feedback | Regulates to 1.202V; high-impedance input (≤20nA bias) minimizes divider current loss |
| 7 (PG) | Open-drain power-good flag | Pulls low until VOUT reaches 92% of setpoint; supports system sequencing with external pull-up |
| 12 (SWEN) | Switch enable & UVLO input | Programmable turn-on threshold (0.9–1.1V); resistor divider enables custom undervoltage lockout |
| 18 (VIN) | Main supply input | Accepts 1V–60V; local bypassing required; powers control circuitry pre-startup |
| 20 (SW) | Internal NPN collector | 70V-rated switch node; requires minimized trace area to reduce EMI and parasitic ringing |
| 21 (GND) | Ground reference & thermal pad | Exposed pad must be soldered to PCB ground plane for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode | Maintains <10mV output ripple while reducing quiescent current to <3µA-ideal for battery-backed sensors and IoT nodes |
| FMEA Fault Tolerance | TSSOP-specific layout rules (floating NC pins) prevent output overvoltage during adjacent-pin shorts or opens |
| Dual Supply Pins (VIN/BIAS) | Automatic supply selection extends operational range to ~1V post-startup-critical for cold-crank automotive scenarios |
| Programmable Frequency | 250kHz–1.5MHz via RT-to-GND resistor-allows optimization of size (high-f) vs. efficiency (low-f) trade-offs |
| Soft-Start Control | External capacitor on SS pin sets ramp time; internal 256kΩ current source ensures monotonic VOUT rise |
Applications
| Automotive ECU Power | Portable Medical Device Supply |
|---|---|
Use Scenario: Powering microcontrollers and CAN transceivers in engine control units exposed to 12V battery with cold-crank dips to 1.3V and load-dump spikes to 60V. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to regulate 5V/3.3V rails from unregulated vehicle battery. Use Value: Dual-supply operation maintains regulation during cold-crank; 70V switch withstands load-dump transients without external protection. | Use Scenario: Providing ultra-low-quiescent 3.3V rail for wearable ECG monitors operating continuously on coin-cell batteries. IC Role / Device Role / Timing Role: Boost converter delivering regulated output from 1.8–3.6V Li-ion or alkaline sources with programmable UVLO. Use Value: 7µA active IQ and <3µA Burst Mode sleep current maximize battery runtime; low-ripple operation avoids sensor noise coupling. |
| Industrial Sensor Node | Smart Meter Auxiliary Rail |
Use Scenario: Generating isolated 5V auxiliary supply for RS-485 transceivers and ADCs in 24V-powered factory-floor sensors. IC Role / Device Role / Timing Role: Flyback controller driving transformer-coupled secondary for galvanic isolation and noise rejection. Use Value: Integrated 70V switch eliminates need for external HV MOSFET; frequency foldback ensures stable start-up under varying line/load conditions. | Use Scenario: Powering metrology ASICs and real-time clocks in electricity meters requiring long-term reliability across 85–265VAC input ranges. IC Role / Device Role / Timing Role: SEPIC front-end regulator accepting wide-input DC derived from rectified AC, delivering stable 3.3V rail. Use Value: 60V max input accommodates full rectified AC envelope; FMEA fault tolerance prevents meter failure due to PCB-level defects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3589EUF#PBF | Integrated 4-channel buck regulator with I2C interface; no SEPIC/boost-only support; 2.5V–5.5V input; 1.8A per channel | Targeted at multi-rail PMIC applications-not suitable for high-voltage (>12V) or SEPIC topologies | Select only if system requires digital control and multiple synchronized outputs within low-voltage domain |
| LM5122MTX/NOPB | Current-mode boost/SEPIC controller (no integrated switch); 3V–65V input; 500kHz max frequency; external MOSFET required | Requires external 70V+ MOSFET and gate driver; higher BOM count but greater flexibility in switch selection | Choose when higher efficiency at >2A loads or custom thermal management is needed beyond LT8494EFE#PBF's 2A limit |
Compared with LTC3589EUF#PBF and LM5122MTX/NOPB, the LT8494EFE#PBF uniquely combines integrated 70V/2A switching, SEPIC/boost/flyback flexibility, sub-7µA quiescent current, and FMEA-safe TSSOP packaging-making it optimal for space-constrained, high-reliability, wide-input industrial and automotive converters where integration and fault resilience are critical.
Availability
LT8494EFE#PBF is available at Aetrix Electronics and suitable for automotive ECU power, portable medical device supply, industrial sensor node, and smart meter auxiliary rail applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8494EFE#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 (acquired Linear Technology in 2017) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.
The LT8494 product line delivers highly integrated, fault-tolerant DC/DC controllers optimized for wide-input industrial and automotive power conversion-emphasizing ultra-low IQ, high-voltage robustness, and functional safety compliance.
FAQ
What is the maximum input voltage supported by the LT8494EFE#PBF in SEPIC topology?
The LT8494EFE#PBF supports up to 60V input voltage in SEPIC topology, as specified in Absolute Maximum Ratings and confirmed in Applications Information. For boost and flyback configurations, the maximum continuous input is 32V, though it tolerates transient ride-through up to 60V. This 60V SEPIC rating makes LT8494EFE#PBF suitable for 48V industrial bus and automotive battery applications with load-dump protection requirements.
How does the LT8494EFE#PBF achieve ultra-low quiescent current, and what is its typical value?
The LT8494EFE#PBF achieves ultra-low quiescent current through architectural optimizations including low-power bias networks, clock gating in Burst Mode, and efficient charge-pump-free NPN drive. Its typical active quiescent current is 7µA at 12VIN → 5VOUT, dropping to ~0.3µA when SWEN is low (shutdown). These values are measured and guaranteed across temperature for the LT8494E grade, directly enabling multi-year battery life in always-on applications using LT8494EFE#PBF.
What package type and thermal characteristics does the LT8494EFE#PBF use?
The LT8494EFE#PBF uses a 20-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 21) that must be soldered to PCB ground. Its junction-to-ambient thermal resistance is θJA = 38°C/W. This package provides FMEA fault tolerance-specific NC pins must remain floating to ensure output voltage remains within regulation during adjacent-pin shorts. The exposed pad significantly improves thermal performance versus standard TSSOP, supporting continuous 2A switching in compact layouts.
Can the LT8494EFE#PBF operate when the input voltage drops below 2.5V after startup?
Yes-the LT8494EFE#PBF can continue regulating even when VIN drops below 2.5V after startup by automatically drawing current from the BIAS pin (connected to VOUT). Electrical Characteristics confirm minimum operating voltage of 2.4V for both VIN and BIAS under respective conditions, and Applications Information states operation down to ~1V post-startup. This capability is essential for cold-crank automotive scenarios and brownout recovery, and is a core design feature of LT8494EFE#PBF.
What is the purpose of the SWEN pin on the LT8494EFE#PBF, and how is it used?
SWEN is the Switch Enable Detect pin on the LT8494EFE#PBF. It serves two functions: enabling/disabling the regulator and implementing programmable undervoltage lockout (UVLO). An internal comparator triggers at 0.9–1.1V (typical), so connecting a resistor divider from VIN to SWEN allows custom UVLO thresholds. When SWEN is pulled low, LT8494EFE#PBF enters ultra-low-IQ shutdown (~0.3µA). This pin is critical for system-level power sequencing and battery protection in designs using LT8494EFE#PBF.
LT8494EFE#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, 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:
- 2A
- Frequency - Switching:
- 250kHz ~ 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8494EFE#PBF FAQ
1.How can I place an order for LT8494EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8494EFE#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 LT8494EFE#PBF reliable?
The price and inventory of LT8494EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8494EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8494EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8494EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8494EFE#PBF?
LT8494EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8494EFE#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 LT8494EFE#PBF?
For technical support, including LT8494EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8494EFE#PBF requirements.
6.How does Aetrix verify that LT8494EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8494EFE#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 LT8494EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8494EFE#PBF?
All LT8494EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8494EFE#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 LT8494EFE#PBF part is unused and in its original packaging.
Return procedure for LT8494EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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