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Analog Devices Inc. LT8494EUF#TRPBF
- Part No.:
- LT8494EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8494EUF#TRPBF.pdf
- Description:
- IC REG BST CHARGE PUMP ADJ 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
LT8494EUF#TRPBF 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. It delivers up to 1.0A output at VIN > 12V in SEPIC configuration and targets battery-powered industrial and automotive ECU supplies.
For engineers reviewing the LT8494EUF#TRPBF datasheet, LT8494EUF#TRPBF pinout, LT8494EUF#TRPBF application, or LT8494EUF#TRPBF equivalent, key selection criteria include its 7µA IQ, programmable UVLO via SWEN, low-ripple Burst Mode operation (<10mV ripple), and fault-tolerant TSSOP package option - all critical for ultra-low-power, wide-input industrial converters.
Technical Context
The LT8494EUF#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 even when VIN drops below 2.5V post-startup.
Burst Mode reduces quiescent current to <3µA during light loads while maintaining <10mV output ripple via controlled single-cycle bursts. Frequency foldback activates when FB < 1V, lowering switching frequency to improve start-up control and prevent minimum on-time violation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | SEPIC, boost, or flyback - enables flexible input-to-output voltage relationships including VOUT > VIN or VOUT < VIN. |
| Switch Rating | 2A/70V NPN - supports high-voltage industrial inputs up to 60V (SEPIC) or 32V (boost/flyback) with ride-through to 60V. |
| Quiescent Current | 7µA (active), ~0.3µA (shutdown) - extends battery life in always-on portable and automotive systems. |
| Feedback Voltage | 1.202V ±24mV - sets precise output regulation; used with resistor divider to program VOUT from ~1.3V to >60V. |
| Switching Frequency | 250kHz–1.5MHz (RT-programmable) - allows optimization of size (high f) vs. efficiency (low f) and EMI filtering. |
| Minimum On/Off Time | 95ns / 70ns - constrains practical duty cycle range and maximum achievable VOUT/VIN ratio at high frequencies. |
| Power Good Threshold | 92% of FB regulation voltage - provides reliable output-valid signal down to VIN = 1.3V, supporting brownout detection. |
Pinout & Package
LT8494EUF#TRPBF is housed in a 20-lead (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND). The package features low θJA = 47°C/W and requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SS) | Soft-Start Control | Charged by internal 256kΩ resistor to ~2.1V; external capacitor sets ramp rate and prevents inrush current. |
| Pin 2 (RT) | Oscillator Frequency Set | Resistor to GND programs switching frequency from 250kHz to 1.5MHz; low capacitance required. |
| Pins 3,4,9,11,13,14,15,21 | Ground | All GND pins and exposed pad must be soldered to local ground plane for low-impedance return and thermal dissipation. |
| Pin 6 (SWEN) | Enable & UVLO Input | Resistor divider sets programmable undervoltage lockout; rising threshold = 1.0V ±0.1V. |
| Pin 10 (VIN) | Main Supply Input | Accepts 1V–60V (SEPIC); powers control circuitry pre-startup; bypassed locally with 2.2–4.7µF ceramic. |
| Pin 12 (SW) | Switch Collector | Connects to collector of internal 2A/70V NPN; minimize trace area to reduce EMI and parasitic inductance. |
| Pin 16 (BIAS) | Secondary Supply Input | Accepts 1V–60V; used post-startup to extend battery life when VIN drops below 2.5V; bypassed locally. |
| Pin 17 (FB) | Voltage Feedback | Regulated to 1.202V; connects to resistor divider from VOUT to set output voltage; bias current <20nA. |
| Pin 20 (PG) | Power Good Flag | Open-drain output; pulled low until FB reaches 92% of regulation voltage; supports system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Burst Mode | Maintains <10mV output ripple at light loads while reducing IQ to <3µA - eliminates need for external LDO post-regulation. |
| Dual-Supply Auto-Selection | VIN/BIAS pins enable automatic sourcing from most efficient rail; extends functional input range to ~1V after startup. |
| FMEA-Fault-Tolerant Design | TSSOP variant guarantees output does not exceed programmed voltage under adjacent-pin short or open faults - critical for automotive safety. |
| Programmable UVLO & Soft-Start | SWEN pin supports resistor-divider UVLO; SS pin uses single capacitor for controlled ramp - simplifies robust power-up sequencing. |
| Frequency Foldback | Reduces switching frequency when FB < 1V - improves start-up stability and prevents minimum on-time violation at low VOUT. |
Applications
| Automotive ECU Power | Portable Medical Device Supply |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in engine control unit with 6V–16V battery input and cold-crank down to 3V. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to maintain regulated 5V/3.3V output during cranking and load-dump events. Use Value: 7µA quiescent current minimizes battery drain during vehicle sleep mode; PG flag enables safe MCU wake-up sequencing. | Use Scenario: Generating isolated 5V and 3.3V rails from a single-cell Li-ion battery (2.7V–4.2V) in handheld diagnostic equipment. IC Role / Device Role / Timing Role: Boost converter delivering up to 0.6A at 5V with programmable soft-start to avoid inrush into capacitive loads. Use Value: Dual-supply operation allows BIAS pin to power control circuitry from output rail, sustaining regulation even as battery drops to 2.5V. |
| Industrial Sensor Node Supply | Smart Meter Auxiliary Rail |
Use Scenario: Providing stable 3.3V for LoRaWAN radio and MEMS sensor in battery-operated wireless node with 3.6V primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Low-IQ boost regulator operating in Burst Mode to sustain multi-year battery life while delivering burst current for RF transmission. Use Value: <10mV output ripple ensures clean analog sensor readings; programmable UVLO prevents operation below safe battery cutoff voltage. | Use Scenario: Generating auxiliary 5V rail from 12V–48V AC/DC adapter in electricity meter with strict standby power limits. IC Role / Device Role / Timing Role: SEPIC converter accepting wide input range while maintaining isolation and low standby consumption. Use Value: 7µA IQ meets IEC 62053-21 Class 0.5S standby requirements; PG signal validates rail before enabling metrology IC. |
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 | External MOSFET driver; no integrated switch; 500kHz max fSW; 1.5mA IQ | Requires external high-side N-channel MOSFET; better suited for >3A output or higher efficiency at medium loads | Select when higher output current or discrete FET optimization is needed; not drop-in due to different pinout and external FET requirement |
| LT8330EDD#TRPBF | Integrated 1.5A/140V switch; fixed 2MHz fSW; 28µA IQ; no BIAS pin | Lacks dual-supply capability and programmable UVLO; optimized for compact high-freq boost, not wide-VIN SEPIC | Choose for space-constrained 2MHz boost designs where IQ <7µA is not mandatory and BIAS functionality is unnecessary |
Compared with LTC3873EMS#TRPBF and LT8330EDD#TRPBF, the LT8494EUF#TRPBF uniquely combines integrated 2A/70V switching, sub-7µA quiescent current, dual-supply operation, and programmable UVLO - making it optimal for ultra-low-power, wide-input industrial and automotive converters requiring minimal external components.
Availability
LT8494EUF#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 and long production lifecycles.
Supply support for LT8494EUF#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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8494 product line delivers highly integrated, ultra-low-quiescent-current DC/DC controllers for battery-critical and wide-input industrial power conversion - emphasizing reliability, fault tolerance, and design simplicity.
FAQ
What is the minimum input voltage required for LT8494EUF#TRPBF to start up and regulate?
The LT8494EUF#TRPBF requires a minimum VIN of 2.5V for startup when BIAS is ≥2.5V, or 2.4V when BIAS < 2.5V. After startup, it can continue regulating with VIN as low as ~1V by drawing power from the BIAS pin - a key feature enabling operation during deep battery discharge. This behavior is confirmed in the Electrical Characteristics table under "Minimum VIN Operating Voltages".
Does LT8494EUF#TRPBF support SEPIC topology, and what are the critical layout considerations?
Yes, the LT8494EUF#TRPBF explicitly supports SEPIC topology per its datasheet description and typical application circuits. Critical layout considerations include minimizing loop area for the two inductors and coupling capacitor, using separate ground paths for power and signal sections, and placing input/output capacitors as close as possible to VIN, BIAS, SW, and FB pins. The QFN's exposed pad must be solidly soldered to a thermal ground plane to manage heat from the 2A switch.
How is the power good (PG) signal asserted on LT8494EUF#TRPBF, and what is its voltage threshold?
The PG pin on LT8494EUF#TRPBF is an open-drain output that remains low until the FB pin voltage reaches 92% of the 1.202V regulation reference (i.e., ~1.106V), and no fault conditions exist. Its low-state voltage is ≤150mV at 1.25mA sink current. This threshold is guaranteed over temperature and enables reliable system power sequencing - a specification directly documented in the Electrical Characteristics table under "PG Threshold as % of VFB Regulation Voltage".
Can LT8494EUF#TRPBF operate with only the BIAS supply and zero VIN?
No - the LT8494EUF#TRPBF requires either VIN or BIAS to be present for initial startup; both cannot be zero simultaneously. However, once started, if VIN drops below ~2.5V, the part automatically switches to BIAS for power, allowing continued regulation even with VIN ≈ 0V (as long as BIAS remains ≥2.4V). This dual-supply handoff is a core feature validated in the Applications Information section and Electrical Characteristics table.
What is the purpose of the NC pins on LT8494EUF#TRPBF, and can they be tied to ground?
The NC pins on LT8494EUF#TRPBF (e.g., Pins 5,7,8,18,19 in QFN) are not connected internally and must remain unconnected - tying them to ground or any other potential violates the datasheet's Pin Functions section and may compromise FMEA fault tolerance, especially in the TSSOP variant. In the QFN package, these pins are electrically floating by design and serve no function; grounding them introduces unintended parasitics and is explicitly discouraged in the official documentation.
LT8494EUF#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:
- 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-QFN (4x4)
LT8494EUF#TRPBF FAQ
1.How can I place an order for LT8494EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8494EUF#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 LT8494EUF#TRPBF reliable?
The price and inventory of LT8494EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8494EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8494EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8494EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8494EUF#TRPBF?
LT8494EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8494EUF#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 LT8494EUF#TRPBF?
For technical support, including LT8494EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8494EUF#TRPBF requirements.
6.How does Aetrix verify that LT8494EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8494EUF#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 LT8494EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8494EUF#TRPBF?
All LT8494EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8494EUF#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 LT8494EUF#TRPBF part is unused and in its original packaging.
Return procedure for LT8494EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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