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Analog Devices Inc. LT8494IFE#TRPBF
- Part No.:
- LT8494IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8494IFE#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,701
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Product details
Overview
LT8494IFE#TRPBF from Analog Devices is a monolithic SEPIC/boost/flyback DC/DC controller IC featuring a 2A/70V NPN power switch, programmable switching frequency (250kHz–1.5MHz), 7µA 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 from ≥12V input in SEPIC topology for automotive ECU power supplies.
For engineers reviewing the LT8494IFE#TRPBF datasheet, LT8494IFE#TRPBF pinout, LT8494IFE#TRPBF application, or LT8494IFE#TRPBF equivalent, key selection criteria include its FMEA-fault-tolerant TSSOP package, low-ripple Burst Mode® operation (<10mV ripple), programmable UVLO via SWEN, and compatibility with high-input-voltage industrial and automotive systems requiring extended battery life and robust start-up behavior.
Technical Context
The LT8494IFE#TRPBF implements constant-frequency current-mode control with internal slope compensation, supporting stable operation up to 50% duty cycle without external compensation. Its dual-supply architecture automatically selects between VIN and BIAS for NPN base drive, enabling efficient operation when VIN drops below 2.5V while maintaining regulation via BIAS.
It integrates frequency foldback (activates when FB < 1V), soft-start (programmed by external capacitor on SS pin), and a precision power-good flag (PG asserts high when VOUT reaches 92% of regulation voltage). The internal 1.202V feedback reference and 70ns minimum off-time support tight output regulation across wide input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | SEPIC, boost, or flyback - enables flexible input-to-output voltage relationships including step-up, step-down, or buck-boost with isolation capability. |
| Switch Rating | 2A continuous, 70V collector-emitter - supports high-voltage transient tolerance and 1.0A output at 5V in SEPIC configuration with 12V+ input. |
| Quiescent Current | 7µA from VIN at 12V → 5V; 0.3µA shutdown - extends battery life in always-on automotive and portable systems. |
| Input Voltage Range | ~1V to 60V (SEPIC); 2.5V to 32V startup - allows direct connection to 12V/24V/48V rails and operation during cold-crank or brownout conditions. |
| Feedback Reference | 1.202V ±24mV - sets precise output voltage via resistor divider; enables 5V output with 1% resistors (R1=100kΩ, R2=316kΩ). |
| Switching Frequency | 250kHz–1.5MHz (RT-programmable) - balances efficiency, size, and EMI; 450kHz typical for 5V SEPIC design. |
| Power Good Threshold | 92% of FB regulation voltage - provides reliable output validation down to 1.3V input supply, critical for system sequencing. |
Pinout & Package
LT8494IFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE grade) with exposed thermal pad (Pin 21 = GND). The package supports FMEA fault tolerance: adjacent pin shorts or opens do not cause overvoltage at the output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BIAS) | Secondary supply input | Accepts regulated output voltage to power internal circuitry when VIN drops below 2.5V; enables ultra-low-voltage operation. |
| 2,3 (FB) | Feedback input | Senses output voltage via resistor divider; regulates to 1.202V reference; low 20nA bias current minimizes load error. |
| 7 (PG) | Open-drain power-good flag | Pulls low until VOUT reaches 92% of target; requires external pull-up; signals valid output to host MCU or PMIC. |
| 12 (SWEN) | Switch enable / UVLO input | Resistor-divider programmable undervoltage lockout; rising threshold = 1.0V ±0.1V; enables precise input monitoring. |
| 18 (VIN) | Main supply input | Accepts up to 60V input; bypassed locally; powers control logic before startup and during normal operation. |
| 20 (SW) | Internal NPN collector | Connects to external inductor/diode; 70V rating handles boost/SEPIC flyback spikes; minimize trace area for EMI reduction. |
| 21 (GND) | Ground / thermal pad | Exposed pad must be soldered to PCB ground plane for thermal dissipation (θJA = 38°C/W) and electrical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode® | Maintains <10mV output ripple at light loads while reducing IQ to <3µA - eliminates audible noise and preserves battery runtime in standby. |
| FMEA-fault-tolerant TSSOP | Guaranteed no overvoltage under adjacent pin short/open faults - meets ASIL-B functional safety requirements for automotive ECUs. |
| Dual-supply automatic selection | VIN/BIAS comparator with 0.55V hysteresis ensures seamless switchover - enables >20hr operation from single-cell Li-ion after VIN collapse. |
| Programmable frequency foldback | Reduces switching frequency when FB < 1V - improves start-up reliability and prevents subharmonic oscillation at high duty cycles. |
| Soft-start with external capacitor | 256kΩ internal charging current ramps SS pin to ~2.1V - controls inrush current and prevents output overshoot during power-up. |
Applications
| Automotive ECU Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog front-end in engine control unit during cold-crank (4.5V–16V battery range) and load-dump (up to 60V). IC Role / Device Role / Timing Role: Primary DC/DC controller managing SEPIC conversion from battery to stable 5V rail with fault-tolerant PG signaling. Use Value: FMEA-compliant TSSOP package prevents output overvoltage during pin faults; 7µA IQ extends ECU sleep mode duration. | Use Scenario: Providing regulated 5V from 12V industrial bus to low-power wireless sensor node with intermittent RF transmission. IC Role / Device Role / Timing Role: High-efficiency boost converter operating in Burst Mode® during 99% idle time to minimize average supply current. Use Value: <10mV output ripple avoids ADC reference noise; programmable UVLO disables converter during brownout, preventing corrupted sensor readings. |
| Portable Medical Device Battery Backup | Ruggedized IoT Gateway Power |
Use Scenario: Maintaining 3.3V/5V rails for memory retention and real-time clock during main battery depletion in handheld diagnostic tool. IC Role / Device Role / Timing Role: SEPIC controller using BIAS-fed operation to sustain output when main input drops below 2.5V. Use Value: 0.3µA shutdown current extends backup runtime; dual-supply architecture enables seamless transition without reset. | Use Scenario: Converting 24V PoE-derived input to isolated 5V/12V rails in outdoor cellular gateway subject to wide ambient temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: Robust boost controller with 150°C H-grade option (LT8494HFE) and 60V input tolerance for surge immunity. Use Value: 70V switch rating withstands 100V transients; thermal pad ensures stable operation at full load in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SEPIC/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3873EMS#TRPBF | Fixed 500kHz frequency; no BIAS pin; 60V input; 3.5A switch; higher IQ (25µA) | Lacks dual-supply operation and ultra-low IQ; better suited for high-current, fixed-frequency designs | Select when peak current >2A is required and battery life is secondary to power density. |
| MAX17595ATP+T | Current-mode boost/SEPIC controller; 60V input; 2.5A switch; 12µA IQ; no PG or frequency foldback | Missing power-good flag and start-up optimization features; requires external MOSFET | Choose when discrete FET selection is preferred and system-level sequencing is handled externally. |
Compared with LTC3873EMS#TRPBF and MAX17595ATP+T, LT8494IFE#TRPBF uniquely combines FMEA-tolerant packaging, sub-7µA quiescent current, integrated NPN switch, and BIAS-enabled ultra-low-voltage operation - making it optimal for safety-critical, battery-sensitive automotive and portable applications where reliability and runtime are prioritized over raw current capability.
Availability
LT8494IFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, industrial sensor node supply, and portable medical device battery backup requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8494IFE#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8494 product line delivers fault-tolerant, ultra-low-quiescent-current DC/DC controllers for mission-critical power systems where reliability, efficiency, and wide input range are essential - especially in automotive and portable electronics.
FAQ
What is the maximum input voltage supported by the LT8494IFE#TRPBF in SEPIC topology?
The LT8494IFE#TRPBF supports up to 60V input voltage in SEPIC topology, as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables. This rating applies regardless of output voltage and enables use in 48V industrial systems and automotive load-dump scenarios. For boost and flyback topologies, the maximum input is 32V with ride-through capability up to 60V during transients.
How does the LT8494IFE#TRPBF achieve 7µA quiescent current, and under what conditions is this value guaranteed?
The LT8494IFE#TRPBF achieves 7µA quiescent current from VIN when operating at TA = 25°C, VIN = 12V, VBIAS = 5V, and VFB = 1.25V - per Electrical Characteristics table. This value is measured in active regulation mode (SWEN high), not shutdown. In shutdown (SWEN low), quiescent current drops to 0.3µA. The 7µA figure reflects total control circuit consumption, excluding external feedback divider current.
Can the LT8494IFE#TRPBF operate with input voltage below 2.5V, and if so, how?
Yes - the LT8494IFE#TRPBF can operate with VIN as low as ~1V after startup by drawing power from the BIAS pin. When VIN drops below 2.5V, the internal supply selector automatically switches to BIAS (typically connected to VOUT), allowing continued regulation even during deep battery discharge. This behavior is enabled by the dual-supply architecture and is validated across the –40°C to 125°C operating range.
What is the purpose of the exposed thermal pad (Pin 21) on the LT8494IFE#TRPBF TSSOP package, and how must it be implemented?
The exposed thermal pad (Pin 21) on the LT8494IFE#TRPBF is electrically connected to GND and serves both thermal and electrical functions. It must be soldered directly to a large PCB copper pour tied to the system ground plane to achieve θJA = 38°C/W. Failure to solder the pad degrades thermal performance and may cause junction temperature exceedance under sustained 1A load conditions.
Does the LT8494IFE#TRPBF support programmable undervoltage lockout (UVLO), and how is it configured?
Yes - the LT8494IFE#TRPBF supports programmable UVLO via the SWEN pin. A resistor divider from VIN to SWEN sets the turn-on threshold; the internal comparator triggers at 1.0V ±0.1V (rising). For example, a 1MΩ–316kΩ divider yields ~5V UVLO. Hysteresis of 30mV prevents chatter near the threshold, and the feature is fully operational down to 1.3V input supply.
LT8494IFE#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, 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
LT8494IFE#TRPBF FAQ
1.How can I place an order for LT8494IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8494IFE#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 LT8494IFE#TRPBF reliable?
The price and inventory of LT8494IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8494IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8494IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8494IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8494IFE#TRPBF?
LT8494IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8494IFE#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 LT8494IFE#TRPBF?
For technical support, including LT8494IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8494IFE#TRPBF requirements.
6.How does Aetrix verify that LT8494IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8494IFE#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 LT8494IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8494IFE#TRPBF?
All LT8494IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8494IFE#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 LT8494IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8494IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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