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Analog Devices Inc. LT8471EFE#TRPBF
- Part No.:
- LT8471EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471EFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,745
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Product details
Overview
LT8471EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, multitopology PWM DC/DC controller IC with two integrated 2A, 50V NPN power switches and one 500mA Skyhook boost switch. It supports independent buck, boost, SEPIC, ZETA, flyback, and inverting configurations per channel, delivers ±5V outputs from a 6–32V input, and operates across –40°C to 125°C junction temperature.
For engineers reviewing the LT8471EFE#TRPBF datasheet, LT8471EFE#TRPBF pinout, LT8471EFE#TRPBF application, or LT8471EFE#TRPBF equivalent, this page provides verified functional identity, confirmed TSSOP-20 package mapping, validated dual-channel current-mode control architecture, exact feedback voltage thresholds (±789 mV / ±788 mV), and real-world soft-start, synchronization, and anti-phase switching behavior - all critical for local dual-rail power design validation.
Technical Context
The LT8471EFE#TRPBF implements two independent current-mode controlled PWM channels with anti-phase clocking (170°–200° phase separation) to reduce input ripple. Each primary channel features programmable soft-start, frequency foldback during startup, and open-drain power-good monitoring with ±7.5% output regulation tolerance.
Its integrated Skyhook channel is a fixed-frequency voltage-mode boost regulator delivering 4.25V (typ) above C2, enabling high-side switch drive in buck/ZETA/inverting topologies. The device uses internal NPN switches with VCE(SAT) ≤ 300 mV (primary) and ≤ 250 mV (Skyhook), and supports external synchronization from 100 kHz to 2 MHz with 35–65% duty cycle requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V - supports wide industrial input rails including 6–32V dual-rail designs |
| Primary Switch Rating | 2.55A max (typ), 50V VCE - enables robust 2A continuous operation with margin for transient peaks |
| Skyhook Switch Rating | 500mA, 4.25V regulated boost above C2 - supplies base drive for high-side NPN switches in buck/ZETA |
| Feedback Voltage | +789 mV / –788 mV (LT8471E grade) - sets precise ±5V output with standard resistor dividers |
| Switching Frequency Range | 100 kHz to 2 MHz - adjustable via RT resistor or external SYNC signal for EMI optimization |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive under-hood and industrial embedded use |
| Package | 20-lead TSSOP (FE) with exposed thermal pad - requires soldered GND pad for thermal management (θJA = 38°C/W) |
Pinout & Package
LT8471EFE#TRPBF is housed in a 20-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 21 = GND). All ground pins (Pins 10, 11, 12, and exposed pad) must be soldered directly to the PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (Pins 1, 20) | Primary channel collector outputs | Switching nodes for buck/boost/SEPIC/flyback; require minimized trace area to limit EMI |
| E1, E2 (Pins 2, 19) | Primary channel emitter connections | Return paths for internal NPN switches; tied to GND in low-side configs, float in high-side |
| VIN1, VIN2 (Pins 3, 18) | Channel power inputs | VIN1 powers Channel 1 + Skyhook + bias circuits; VIN2 powers Channel 2 only |
| FB1, FB2 (Pins 5, 16) | Output voltage sense inputs | Connect resistor dividers to set ±5V outputs; ±789 mV / ±788 mV reference enables tight regulation |
| PG1, PG2 (Pins 4, 17) | Open-drain power-good indicators | Pull high externally; go low when output falls >7.5% below target - confirms regulation status |
| RT (Pin 7) | Oscillator timing input | Resistor-to-GND sets free-running frequency: fOSC = 85.5/(RT + 1) MHz (RT in kΩ) |
| SYNC (Pin 9) | External clock input | Accepts 100 kHz–2 MHz digital clock; drives low to revert to internal oscillator |
| SHOUT (Pin 14) | Skyhook regulated output | Fixed 4.25V (typ) above C2; supplies boosted voltage for high-side NPN base drive |
| SS1, SS2 (Pins 8, 15) | Soft-start control inputs | Capacitor-connected pins ramp internal current limits and duty cycles at startup |
| OV/UV (Pin 6) | Enable/disable & UVLO/OVLO input | ≥1.215V enables operation; resistor divider configures programmable lockout thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent multitopology control | Each channel configurable as buck, boost, SEPIC, ZETA, flyback, or inverting - eliminates need for multiple controllers in dual-rail systems |
| Anti-phase switching | ~180° phase shift between channels reduces input capacitor RMS current and input ripple by up to 30% |
| Integrated Skyhook boost | On-chip 500mA boost stage generates stable 4.25V above C2 - enables reliable high-side NPN drive without external charge pump |
| Programmable frequency foldback | Reduces switching frequency to 1/2, 1/4, or 1/8 of nominal during startup - improves controllability at light loads and low VOUT |
| Per-channel soft-start | Independent SS1/SS2 pins allow staggered or synchronized ramp-up of each output - prevents inrush current conflicts in multi-output systems |
Applications
| Industrial Dual-Rail Signal Chain | Automotive Infotainment Power |
|---|---|
Use Scenario: Generating ±5V rails for precision ADCs, DACs, op-amps, and analog front-ends in PLC I/O modules and test equipment. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller managing isolated positive and negative outputs from a single 24V bus. Use Value: Eliminates need for separate buck and inverting converters; anti-phase operation cuts input capacitance requirements by ~30%. |
Use Scenario: Powering display backlight drivers and audio amplifiers in head units using a 6–16V automotive battery supply. IC Role / Device Role / Timing Role: Multitopology controller implementing buck (for 5V logic) and inverting (for –5V bias) from same input rail. Use Value: Skyhook channel ensures stable high-side drive for buck switch across cold-crank (6V) to load-dump (32V) conditions. |
| Medical Imaging Sensor Bias | Industrial Fieldbus Node |
Use Scenario: Providing tightly regulated ±5V bias for CCD/CMOS sensor arrays and low-noise preamps in portable ultrasound devices. IC Role / Device Role / Timing Role: Dual-channel controller operating in buck/inverting mode with synchronized soft-start to avoid sensor reset glitches. Use Value: ±7.5% power-good detection on both rails ensures system-level fault reporting before data acquisition begins. |
Use Scenario: Supplying isolated ±5V for RS-485 transceivers and microcontroller peripherals in hazardous-area process controllers. IC Role / Device Role / Timing Role: Controller configured in SEPIC/inverting topology to maintain regulation during 9–36V input transients. Use Value: Wide 2.6–50V input range and –40°C to 125°C operation support unregulated industrial power buses and extended temperature environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel multitopology DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892-2 | Two independent current-mode controllers with MOSFET gate drivers; no integrated switches; supports up to 60V input | Requires external high-side/high-current MOSFETs; better suited for >3A output or higher efficiency demands | Select when discrete FET control, higher current, or wider VIN (>50V) is required - not a drop-in replacement |
| MAX20406A | Single 3.5A buck controller with integrated MOSFETs; no inverting/Skyhook capability; fixed 500kHz–2.2MHz frequency | Only supports buck topology; lacks dual-rail generation and anti-phase input ripple reduction | Choose for cost-sensitive single-rail 5V applications where negative rail is unnecessary |
Compared with LTC3892-2 and MAX20406A, the LT8471EFE#TRPBF uniquely integrates dual 2A NPN switches and Skyhook boost in one TSSOP package - enabling compact ±5V generation without external FETs or charge pumps, while offering topology flexibility unmatched by single-function controllers.
Availability
LT8471EFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, medical imaging, and fieldbus node designs requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT8471EFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT8471 product line was designed specifically for compact, flexible local dual-rail power conversion in space-constrained systems - emphasizing integrated multitopology control, Skyhook-assisted high-side drive, and robust operation across harsh industrial and automotive environments.
FAQ
What topology configurations does the LT8471EFE#TRPBF support per channel?
The LT8471EFE#TRPBF supports independent buck, boost, SEPIC, ZETA, flyback, and inverting DC/DC converter topologies on each of its two primary channels. This flexibility allows designers to generate both positive and negative outputs - such as ±5V - from a single input rail like 6–32V without requiring multiple dedicated ICs. The Skyhook channel further enables reliable high-side NPN switching in buck and ZETA modes.
How does the Skyhook channel function in the LT8471EFE#TRPBF?
The Skyhook channel in the LT8471EFE#TRPBF is an integrated 500mA boost regulator that delivers a regulated 4.25V (typical) above the C2 pin voltage. It supplies boosted base drive for the internal NPN power switches when configured in high-side topologies like buck or ZETA. When unused, C3 must be tied to GND to disable it and reduce quiescent current. Its operation is fully autonomous and requires no external components beyond the Schottky diode and output capacitor.
What is the purpose of anti-phase switching in the LT8471EFE#TRPBF?
Anti-phase switching in the LT8471EFE#TRPBF means the two primary channels operate with ~180° phase separation (170°–200° typical), reducing input capacitor RMS current and peak-to-peak input ripple by up to 30%. This allows smaller, lower-cost input bulk capacitors and eases EMI filtering requirements - especially valuable in compact industrial and automotive power supplies where board space and noise margins are constrained.
Can the LT8471EFE#TRPBF synchronize to an external clock, and what are the requirements?
Yes, the LT8471EFE#TRPBF can synchronize to an external clock applied to the SYNC pin. The clock must be a digital signal with high level ≥1.3V, low level ≤0.4V, duty cycle between 35% and 65%, and frequency between 100 kHz and 2 MHz. If SYNC is held low for several internal clock cycles, the device reverts to its free-running oscillator. Driving SYNC high continuously halts switching entirely.
What are the key thermal considerations for the LT8471EFE#TRPBF in TSSOP-20 package?
The LT8471EFE#TRPBF in FE (TSSOP-20) package has θJA = 38°C/W and requires the exposed thermal pad (Pin 21) to be soldered directly to a solid PCB ground plane for effective heat dissipation. Thermal shutdown activates at ~164°C and resets at ~162.5°C. For continuous 2A operation across –40°C to 125°C, adequate copper area and optional airflow or heatsinking should be verified per layout - especially when operating near 50V input or high duty cycles.
LT8471EFE#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-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 50V (Switch)
- Current - Output:
- 1.35A (Switch), 2.1A (Switch)
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8471EFE#TRPBF FAQ
1.How can I place an order for LT8471EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471EFE#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 LT8471EFE#TRPBF reliable?
The price and inventory of LT8471EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8471EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471EFE#TRPBF?
LT8471EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471EFE#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 LT8471EFE#TRPBF?
For technical support, including LT8471EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471EFE#TRPBF requirements.
6.How does Aetrix verify that LT8471EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8471EFE#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 LT8471EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8471EFE#TRPBF?
All LT8471EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471EFE#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 LT8471EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8471EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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