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Analog Devices Inc. LT8494HFE#TRPBF
- Part No.:
- LT8494HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8494HFE#TRPBF.pdf
- Description:
- IC REG BST CHRG PUMP ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,028
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Product details
Overview
LT8494HFE#TRPBF from Analog Devices is a monolithic SEPIC/boost/flyback DC/DC controller with 2A/70V NPN power switch, 7µA quiescent current in active operation, and programmable switching frequency from 250kHz to 1.5MHz. It operates across 1V–60V input (with 2.5V startup), supports dual supply pins (VIN/BIAS) for extended battery life, and delivers regulated output in automotive ECU, portable, and industrial power supplies.
For engineers reviewing the LT8494HFE#TRPBF datasheet, LT8494HFE#TRPBF pinout, LT8494HFE#TRPBF application, or LT8494HFE#TRPBF equivalent, key selection factors include its FMEA-fault-tolerant TSSOP package, 7µA IQ at light load, 92% PG threshold, programmable UVLO via SWEN, and thermal rating up to 150°C junction temperature.
Technical Context
The LT8494HFE#TRPBF implements constant-frequency current-mode control with internal slope compensation, enabling stable operation up to 50% duty cycle without external compensation. 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 low-ripple Burst Mode® operation (output ripple <10mV typ. with 47µF), frequency foldback during soft-start, and active clamp-based current limiting. The 20-lead TSSOP package includes exposed pad for thermal management and FMEA fault tolerance-adjacent pin shorts or opens do not cause overvoltage at VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | SEPIC, boost, flyback - enables single-chip solutions for wide VIN/VOUT ratios and non-inverting buck-boost needs. |
| Input Voltage Range | 1V to 60V (2.5V min for startup); allows direct battery-to-load conversion in 12V/24V/48V systems with brownout resilience. |
| Quiescent Current | 7µA at 12VIN→5VOUT; extends runtime in always-on IoT sensors and automotive standby circuits. |
| Switch Rating | 2A peak, 70V collector-emitter - supports high-voltage transient immunity and >30W output capability in SEPIC/boost configurations. |
| PG Threshold | 92% of FB regulation voltage (1.106V typ.); provides precise power-good signaling for microcontroller sequencing. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive applications and high-ambient industrial environments. |
| Package | 20-lead TSSOP with exposed pad - enables low-θJA (38°C/W) and FMEA-compliant fault behavior per datasheet Section 1. |
Pinout & Package
LT8494HFE#TRPBF uses a 20-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 21 = GND). Pin assignments are validated per Linear Technology (now Analog Devices) datasheet Rev. FA, Figure "PIN CONFIGURATION".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BIAS) | Secondary supply input | Enables post-startup operation down to ~1V VIN by sourcing base drive from VOUT; reduces minimum operating voltage. |
| 2,3 (FB) | Feedback reference node | Regulated to 1.202V ±24mV; sets output voltage via resistor divider; bias current <20nA minimizes divider loss. |
| 7 (PG) | Open-drain power-good flag | Pulls low until VFB ≥ 92% of regulation point; requires external pull-up for system sequencing. |
| 12 (SWEN) | Enable/UVLO control | Programmable turn-on threshold (0.9–1.1V rising); resistor divider enables custom undervoltage lockout. |
| 18 (VIN) | Main supply input | Accepts up to 60V; local bypassing required; powers internal circuitry pre-startup and during high-load operation. |
| 20 (SW) | NPN switch collector | Drives external inductor/diode; 70V rating handles boost flyback spikes; minimize trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| FMEA Fault Tolerance | TSSOP package ensures VOUT remains within regulation during adjacent-pin shorts or open-circuit faults - critical for ASIL-B automotive designs. |
| Low-Ripple Burst Mode® | Maintains <10mV output ripple at light loads while reducing IQ to <3µA - eliminates need for secondary LDO in ultra-low-power systems. |
| Dual Supply Selection Logic | Automatically routes base drive from lower-voltage of VIN or BIAS, extending battery life beyond cutoff voltage of primary source. |
| Programmable Frequency Foldback | Reduces switching frequency when FB <1V during startup, improving minimum duty-cycle control and preventing current-limit instability. |
| Soft-Start Control | Internal 256kΩ current source charges external SS capacitor to ~2.1V; enables controlled ramp-up of output voltage and inrush current limiting. |
Applications
| Automotive Engine Control Unit (ECU) Power | Portable Medical Device Supply |
|---|---|
Use Scenario: Regulating 12V vehicle battery to stable 5V/3.3V for microcontroller, CAN transceiver, and sensor interfaces in engine bay environments. IC Role / Device Role / Timing Role: Primary DC/DC controller managing input transients up to 60V, supporting cold-crank (4.5V) and load-dump (40V) conditions with FMEA-safe operation. Use Value: 150°C junction rating and fault-tolerant TSSOP allow direct placement near ECU MCU; 7µA IQ preserves battery during ignition-off periods. | Use Scenario: Powering handheld ultrasound or glucose monitor from single Li-ion cell (3.0–4.2V) to isolated 5V analog rails and 3.3V digital logic. IC Role / Device Role / Timing Role: SEPIC topology converter delivering non-inverting step-up/step-down with no polarity reversal; maintains regulation during battery discharge. Use Value: Dual-supply operation (VIN/BIAS) sustains regulation as battery drops below 2.5V; Burst Mode keeps no-load IQ <3µA for multi-week standby. |
| Industrial Sensor Node Power | Railway Signaling Interface Supply |
Use Scenario: Converting 24V DC rail to 5V for wireless sensor transceivers in factory automation, with immunity to 40V surges and 100ms brownouts. IC Role / Device Role / Timing Role: Boost converter with programmable UVLO (via SWEN) and PG flag for host MCU supervision and fault logging. Use Value: 60V input rating and 92% PG threshold enable robust start-up after line disturbances; TSSOP thermal performance supports sealed enclosures. | Use Scenario: Generating isolated 12V/–12V supplies from 72V–110V nominal railway traction power for signal conditioning and opto-isolator drivers. IC Role / Device Role / Timing Role: Flyback controller supporting high-VIN startup and wide output regulation range; integrated frequency foldback stabilizes light-load operation. Use Value: 70V switch rating withstands 150V transients per EN 50155; 150°C rating accommodates convection-cooled mounting on DIN rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SEPIC/boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | Requires external MOSFETs; supports synchronous rectification; higher max frequency (400kHz–1MHz); no integrated NPN switch. | Better efficiency >10W; unsuitable for space-constrained designs needing integrated switch. | Select when >90% efficiency at full load is prioritized over board area and component count. |
| LT8330IFE#PBF | Integrated 1.5A/140V switch; fixed 2MHz frequency; no BIAS pin; lower IQ (2.5µA); no PG flag. | Optimized for compact 2MHz boost designs; lacks dual-supply flexibility and power-good signaling. | Select for high-frequency, low-profile boost converters where PG and battery extension are non-critical. |
Compared with LTC3789EFE#PBF and LT8330IFE#PBF, the LT8494HFE#TRPBF uniquely combines integrated 2A/70V NPN switching, dual-supply operation, FMEA-tolerant packaging, and 150°C rating - making it optimal for thermally demanding, safety-aware, and battery-sensitive SEPIC/boost applications where integration and reliability outweigh raw efficiency or frequency agility.
Availability
LT8494HFE#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, long-term lifecycle support, and guaranteed high-temperature operation.
Supply support for LT8494HFE#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 ICs, serving precision, automotive, industrial, and communications markets.
The LT8494 product line delivers fault-resilient, wide-input DC/DC controllers optimized for automotive and industrial applications where extended temperature operation, low quiescent current, and functional safety compliance are essential design requirements.
FAQ
What is the maximum input voltage supported by the LT8494HFE#TRPBF?
The LT8494HFE#TRPBF supports up to 60V on VIN or BIAS pins per Absolute Maximum Ratings. For SEPIC topologies, full 60V operation is allowed; for boost and flyback, input can be up to 32V continuous with ride-through capability to 60V during transients. This rating is validated across the –40°C to +150°C junction temperature range specified for the H-grade part.
Does the LT8494HFE#TRPBF support Burst Mode operation, and what is its typical output ripple?
Yes, the LT8494HFE#TRPBF features low-ripple Burst Mode® operation that maintains output ripple below 10mV typical with a 47µF output capacitor. In this mode, quiescent current drops to <3µA, and the regulator delivers discrete current pulses followed by sleep intervals - ideal for battery-powered systems requiring ultralow standby power without sacrificing regulation accuracy.
How does the LT8494HFE#TRPBF achieve fault tolerance in the TSSOP package?
The LT8494HFE#TRPBF's TSSOP package implements FMEA fault tolerance per datasheet Section 1: adjacent pin shorts or open-circuit faults do not cause output overvoltage. This is achieved through internal design isolation and feedback path redundancy - ensuring VOUT remains within regulation limits even under pin-level failure modes, satisfying ASIL-B functional safety requirements for automotive use.
What is the purpose of the BIAS pin on the LT8494HFE#TRPBF, and how does it extend battery life?
The BIAS pin on the LT8494HFE#TRPBF provides an auxiliary supply input that enables the IC to draw base drive current from the output rail after startup. When VIN drops below ~2.5V, the device automatically switches to BIAS, allowing continued regulation down to ~1V input - significantly extending usable battery capacity in portable and automotive applications where deep discharge must be avoided.
Can the LT8494HFE#TRPBF be used in flyback topology, and what are the key layout considerations?
Yes, the LT8494HFE#TRPBF supports flyback configuration using its NPN switch and external transformer. Key layout considerations include minimizing SW trace area to reduce EMI, placing a local 2.2µF ceramic capacitor directly at the VIN/BIAS pins, routing the FB divider away from noisy nodes, and grounding the exposed pad (Pin 21) solidly to the PCB thermal plane - all validated in the datasheet's Typical Application schematic (Figure TA01a).
LT8494HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8494HFE#TRPBF FAQ
1.How can I place an order for LT8494HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8494HFE#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 LT8494HFE#TRPBF reliable?
The price and inventory of LT8494HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8494HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8494HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8494HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8494HFE#TRPBF?
LT8494HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8494HFE#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 LT8494HFE#TRPBF?
For technical support, including LT8494HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8494HFE#TRPBF requirements.
6.How does Aetrix verify that LT8494HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8494HFE#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 LT8494HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8494HFE#TRPBF?
All LT8494HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8494HFE#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 LT8494HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8494HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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