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Analog Devices Inc. LT8471EUFD#TRPBF
- Part No.:
- LT8471EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8471EUFD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
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Product details
Overview
LT8471EUFD#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, enabling simultaneous positive and negative outputs (e.g., +5V/–5V) from a single 6V–32V input. Designed for local power supply generation in signal chain and industrial embedded systems.
For engineers reviewing the LT8471EUFD#TRPBF datasheet, LT8471EUFD#TRPBF pinout, LT8471EUFD#TRPBF application, or LT8471EUFD#TRPBF equivalent, key selection criteria include its dual-channel current-mode control, programmable 100kHz–2MHz switching frequency via RT pin or external SYNC, anti-phase operation to reduce input ripple, integrated power good (PG1/PG2), and Skyhook-enabled high-side drive capability for buck/ZETA topologies.
Technical Context
The LT8471EUFD#TRPBF implements constant-frequency current-mode control on both primary channels, with independent error amplifiers (70 μmhos transconductance, 95 V/V gain), programmable soft-start (via SS1/SS2 capacitors), and frequency foldback during startup. Its Skyhook channel operates as a fixed-voltage (4.25V typical above C2), voltage-mode boost regulator with integrated Schottky diode and 500mA current limit.
Channel 1 and Channel 2 clocks are phase-shifted ~180° to minimize input capacitor RMS current; each channel features independent UVLO/OVLO programming via OV/UV pin, ±789 mV / –788 mV feedback thresholds, and open-drain PG outputs asserting low when output deviates >7.5% from target. The device supports high-side and low-side switch configurations with distinct voltage ratings: up to 40V VIN–E or 60V VIN–E depending on topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V - supports wide-input industrial and automotive rails without pre-regulation |
| Primary Switch Rating | 2.55A max, 50V VCE - enables robust 2A continuous output in buck/boost/SEPIC with margin |
| Skyhook Switch Rating | 500mA, 4.25V regulated boost above C2 - supplies base drive for high-side NPN switches in buck/ZETA |
| Switching Frequency Range | 100kHz to 2MHz - adjustable via RT resistor or external SYNC clock; enables EMI optimization and compact magnetics |
| Feedback Voltage Accuracy | ±1.5% over temp (773–805 mV positive / –806 to –770 mV negative) - ensures tight output regulation across dual-rail systems |
| Power Good Threshold | ±7.5% of target output - provides reliable system-level power sequencing and fault detection |
| Thermal Shutdown | ~164°C activation, ~162.5°C release - protects internal switches and PCB layout during overload or poor heatsinking |
Pinout & Package
LT8471EUFD#TRPBF is housed in a 28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND). All GND pins (Pins 11, 12, 17, 22, 23, 24, 28, and exposed pad) must be soldered to PCB ground plane for electrical integrity and thermal performance (θJA = 44°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (Pins 1, 20) | Primary channel collector terminals | Connect to inductor/diode nodes; require minimal trace area to suppress EMI in switching paths |
| E1, E2 (Pins 2, 19) | Primary channel emitter terminals | Return path for 2A switches; tied to ground in low-side configs; float in high-side configs |
| C3 (Pin 13) | Skyhook collector | Must tie to GND if Skyhook disabled; otherwise connects to boost inductor anode |
| SHOUT (Pin 14) | Skyhook output cathode | Provides 4.25V-regulated boost voltage above C2; supplies VIN1/VIN2 in high-side topologies |
| FB1, FB2 (Pins 5, 16) | Output voltage sense inputs | Accept resistor dividers for precise ±5V, ±12V, or custom rail regulation; ±789 mV/–788 mV reference |
| PG1, PG2 (Pins 4, 17) | Open-drain power good indicators | Pull high externally; go low when respective output falls >7.5% below setpoint |
| OV/UV (Pin 6) | Programmable enable/disable pin | 1.215V threshold; enables device when ≥1.215V, shuts down when <0.3V |
| RT (Pin 7) | Oscillator timing input | Resistor-to-GND sets free-running frequency (fOSC = 85.5/(RT+1) MHz) |
| SYNC (Pin 9) | External clock input | Accepts 100kHz–2MHz digital clock; overrides RT setting; low <0.4V reverts to internal oscillator |
| VIN1, VIN2 (Pins 3, 18) | Channel power supplies | VIN1 powers Channel 1 + Skyhook + bias; VIN2 powers Channel 2 only; both require ≥2.6V |
| SS1, SS2 (Pins 8, 15) | Soft-start control inputs | Capacitor-to-GND sets ramp rate; internal 250kΩ pull-up charges to ~2.15V at startup |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2A, 50V NPN switches | Enables flexible multitopology design (buck/boost/SEPIC/flyback/inverting) per channel without external MOSFETs |
| Integrated 500mA Skyhook boost regulator | Generates 4.25V above C2 to drive high-side NPN bases in buck/ZETA, eliminating need for external charge pump |
| Anti-phase switching between channels | Reduces input capacitor RMS current and input ripple by ~30% vs. in-phase operation |
| Programmable UVLO/OVLO via OV/UV pin | Single-pin resistor divider configures precise input voltage lockout thresholds for system-level brown-in/out protection |
| Frequency foldback during startup | Reduces minimum duty cycle by factor of 8 to improve controllability and limit inrush current before regulation |
| Thermal shutdown with hysteresis | Auto-restarts after junction cools to ~162.5°C; prevents latch-up and protects external components during sustained overload |
Applications
| Dual-Rail Signal Chain Power | Bipolar Op-Amp Supply |
|---|---|
Use Scenario: Generating ±5V or ±12V rails for precision ADCs, DACs, and analog front-ends in test equipment and data acquisition systems. IC Role / Device Role / Timing Role: Dual-channel controller managing independent buck and inverting converters to deliver tightly regulated, low-noise complementary outputs. Use Value: Eliminates need for discrete regulators or isolated DC/DC modules; leverages anti-phase switching to minimize input filtering requirements. |
Use Scenario: Providing symmetrical positive/negative supply voltages for rail-to-rail op-amps in medical instrumentation and sensor interfaces. IC Role / Device Role / Timing Role: Configured as buck (VOUT1 = +5V) and inverting (VOUT2 = –5V) with shared 6V–32V input; Skyhook enabled to support high-side buck switch. Use Value: Achieves <1% cross-regulation error between rails and <10mV p-p output noise due to integrated error amplifiers and dedicated feedback paths. |
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
Use Scenario: Local DC/DC conversion for isolated digital I/O, analog input, and communication interface rails in programmable logic controllers. IC Role / Device Role / Timing Role: Operates as dual buck converter (e.g., 24V → 5V/3.3V) with independent soft-start and power-good signaling for sequenced subsystem enable. Use Value: Meets IEC 61000-4-5 surge immunity requirements via robust 50V switch rating and integrated OV/UV lockout. |
Use Scenario: Generating auxiliary 5V and –5V rails from 12V battery for CAN transceiver bias, EEPROM backup, and sensor excitation in body electronics. IC Role / Device Role / Timing Role: Uses buck (5V) and inverting (–5V) topologies with frequency synchronized to vehicle clock to avoid EMI in RF bands (e.g., 433MHz, 868MHz). Use Value: Complies with CISPR 25 Class 5 radiated emissions limits via 2MHz max switching frequency and spread-spectrum-capable SYNC input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892-2 | Two independent 60V synchronous buck controllers; no integrated switches or Skyhook; requires external MOSFETs | Better efficiency (>95%) and higher current capability (10A+ per channel); lacks inverting/SEPIC/flyback support | Select when high-efficiency buck-only rails are needed and board space allows external FETs and gate drivers |
| LM51571 | Single-channel 60V boost/SEPIC/flyback controller with integrated 1.2A FET; no dual-channel or negative output capability | Lower BOM cost for single-rail boost applications; cannot generate dual or bipolar outputs without additional ICs | Select for cost-sensitive single-output boost/SEPIC designs where dual-channel functionality is unnecessary |
Compared with LTC3892-2 and LM51571, the LT8471EUFD#TRPBF uniquely integrates dual 2A switches, Skyhook boost, and full multitopology flexibility in one QFN package-enabling compact, self-contained dual-rail solutions where discrete controllers would require ≥3 ICs and external switches.
Availability
LT8471EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, and automotive body control units requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT8471EUFD#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 LT8471EUFD#TRPBF belongs to ADI's Power by Linear™ portfolio of highly integrated DC/DC controllers, designed specifically for space-constrained, multitopology local power generation in industrial, medical, and automotive systems requiring dual-rail or bipolar outputs.
FAQ
What topologies can the LT8471EUFD#TRPBF support on each channel?
The LT8471EUFD#TRPBF supports buck, boost, SEPIC, ZETA, flyback, and inverting DC/DC converter topologies independently on Channel 1 and Channel 2. Each channel uses its own 2A, 50V NPN switch and dedicated feedback (FB1/FB2) and power good (PG1/PG2) circuitry. The Skyhook channel enables high-side configurations by providing a boosted voltage to VIN1/VIN2 when required.
How does the Skyhook channel function in the LT8471EUFD#TRPBF?
The Skyhook channel in the LT8471EUFD#TRPBF is a dedicated 500mA boost regulator that generates a fixed 4.25V (typical) above the C2 pin voltage. It supplies boosted voltage to VIN1 and/or VIN2 to ensure adequate base drive for high-side NPN switches in buck, ZETA, or single-inductor inverting topologies. When unused, C3 must be tied to GND to disable it and reduce quiescent current.
What is the purpose of the anti-phase switching feature in the LT8471EUFD#TRPBF?
The LT8471EUFD#TRPBF automatically operates its two primary channels ~180° out-of-phase to reduce RMS current stress and peak-to-peak ripple on the input capacitor. This minimizes required input capacitance, lowers EMI, and improves thermal performance-especially critical in high-current, space-constrained applications like industrial power modules.
Can the LT8471EUFD#TRPBF generate both positive and negative outputs simultaneously?
Yes, the LT8471EUFD#TRPBF can generate simultaneous positive and negative outputs-for example, +5V and –5V-from a single 6V–32V input. This is achieved by configuring Channel 1 as a buck converter and Channel 2 as an inverting converter, using independent feedback networks and leveraging the device's dual-error-amplifier architecture and separate PG outputs.
What are the thermal limitations and protections built into the LT8471EUFD#TRPBF?
The LT8471EUFD#TRPBF includes thermal shutdown that activates at ~164°C junction temperature and releases at ~162.5°C, providing hysteresis to prevent oscillation. Its 28-lead QFN package features an exposed thermal pad (Pin 29) that must be soldered to PCB ground for effective heat dissipation (θJA = 44°C/W). Derating is recommended above 125°C junction temperature per datasheet specifications.
LT8471EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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:
- 28-QFN (4x5)
LT8471EUFD#TRPBF FAQ
1.How can I place an order for LT8471EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471EUFD#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 LT8471EUFD#TRPBF reliable?
The price and inventory of LT8471EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8471EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471EUFD#TRPBF?
LT8471EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471EUFD#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 LT8471EUFD#TRPBF?
For technical support, including LT8471EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471EUFD#TRPBF requirements.
6.How does Aetrix verify that LT8471EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8471EUFD#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 LT8471EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8471EUFD#TRPBF?
All LT8471EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471EUFD#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 LT8471EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT8471EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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