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Analog Devices Inc. LT8471HFE#TRPBF
- Part No.:
- LT8471HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471HFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,152
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Product details
Overview
LT8471HFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 50V, 2A PWM DC/DC controller IC with integrated NPN power switches and a dedicated 500mA Skyhook boost channel. It supports buck, boost, SEPIC, ZETA, flyback, and inverting topologies per channel, delivers ±5V from a 6–32V input, and operates up to 150°C junction temperature in a 20-lead TSSOP package.
For engineers reviewing the LT8471HFE#TRPBF datasheet, LT8471HFE#TRPBF pinout, LT8471HFE#TRPBF application, or LT8471HFE#TRPBF equivalent, this page provides verified topology flexibility, thermal grade validation, Skyhook voltage regulation specs, anti-phase switching behavior, and confirmed 2.6–50V input range - all critical for high-reliability local power supply design in industrial and automotive environments.
Technical Context
The LT8471HFE#TRPBF integrates two independent current-mode controlled 2A primary channels with programmable 100kHz–2MHz switching frequency (via RT resistor or SYNC pin), plus a voltage-mode Skyhook channel that regulates SHOUT to +4.25V above C2. Each primary channel features separate soft-start (SS1/SS2), power-good (PG1/PG2), and feedback (FB1/FB2) pins with ±789mV/±788mV reference thresholds.
It supports anti-phase operation (170°–200° phase shift) to reduce input ripple, includes frequency foldback during startup, and implements thermal shutdown at ~164°C with automatic recovery. The H-grade variant guarantees full performance from –40°C to +150°C junction temperature, validated by internal overtemperature protection and derated lifetime above 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V - supports wide-input industrial rails and battery-backed systems without external pre-regulation. |
| Primary Switch Current Limit | 2.1A to 3.2A (typ 2.55A) - sets maximum deliverable output current per channel under overload or startup. |
| Skyhook Output Voltage | 4.25V (typ) above C2 - enables reliable high-side switch drive in buck/ZETA/inverting configurations. |
| Switching Frequency Range | 100kHz to 2MHz - allows optimization of size (higher fSW → smaller L/C) vs. efficiency (lower fSW → reduced switching loss). |
| Feedback Reference Voltage | +789mV / –788mV - defines regulated output accuracy for positive/negative rails; enables precise ±5V generation. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive, industrial control, and high-ambient embedded applications. |
| Package | 20-Lead TSSOP with exposed pad (Pin 21 = GND) - provides low θJA = 38°C/W thermal resistance for sustained 2A operation. |
Pinout & Package
LT8471HFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE grade) with an exposed thermal pad (Pin 21) soldered to PCB ground for optimal thermal dissipation (θJA = 38°C/W). All GND pins (10, 11, 12, and exposed pad 21) must be directly connected to the local ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (Pins 1, 20) | Primary Channel Collector Outputs | Switching nodes for 2A NPN power transistors; require minimized trace area to reduce EMI in buck/boost/SEPIC/flyback topologies. |
| E1, E2 (Pins 2, 19) | Primary Channel Emitter Returns | Emitter terminals of internal NPN switches; tied to ground in low-side configs or float in high-side configs (e.g., buck). |
| VIN1, VIN2 (Pins 3, 18) | Channel Power Inputs | VIN1 powers Channel 1, Skyhook, and bias circuits; VIN2 powers Channel 2 only; both require local bypassing. |
| FB1, FB2 (Pins 5, 16) | Output Voltage Feedback Inputs | Connect resistor dividers to set +5V (789mV ref) or –5V (–788mV ref); enable precise regulation and PG monitoring. |
| PG1, PG2 (Pins 4, 17) | Open-Drain Power-Good Flags | Pulled low when output deviates >7.5% from target; require external pull-up resistors for system sequencing. |
| SHOUT (Pin 14) | Skyhook Boost Output | Regulated cathode of internal Schottky diode; supplies boosted voltage to VIN1/VIN2 in high-side switch configurations. |
| RT (Pin 7) | Oscillator Timing Input | Resistor-to-ground sets free-running frequency (fOSC = 85.5/(RT+1) MHz); enables precise clock control without external crystal. |
| SYNC (Pin 9) | External Clock Input | Accepts 100kHz–2MHz digital clock (1.3V high / 0.4V low); synchronizes both channels to avoid beat frequencies in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2A NPN switch channels | Enables flexible multitopology design (buck/buck, buck/boost, invert/invert) without external MOSFETs or gate drivers. |
| Integrated 500mA Skyhook boost regulator | Generates +4.25V above C2 to drive high-side NPN bases in buck/ZETA configurations - eliminates need for external charge pump. |
| Anti-phase switching (170°–200° phase shift) | Reduces RMS input ripple current by up to 70%, allowing smaller input capacitors and lower EMI filtering requirements. |
| Programmable UVLO/OVLO via OV/UV pin | Configurable turn-on threshold (1.13–1.265V) using external resistor divider - supports custom input rail monitoring and brownout protection. |
| Frequency foldback during soft-start | Reduces switching frequency to 1/2–1/8 nominal during startup - lowers minimum duty cycle and improves current control at light loads. |
Applications
| Industrial Dual-Rail Signal Chain | Automotive Infotainment Power |
|---|---|
|
Use Scenario: Generating ±5V for precision ADCs, DACs, and op-amps in PLC I/O modules operating from 24V DC bus. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller providing isolated positive and negative analog supply rails with tight regulation and low noise. Use Value: Eliminates need for discrete transformers or dual ICs; leverages anti-phase switching to minimize input capacitor size and EMI in space-constrained enclosures. |
Use Scenario: Powering display backlight drivers and audio amplifiers in vehicle head units with 9–16V battery input. IC Role / Device Role / Timing Role: Configured as buck + inverting channel to deliver +5V for logic and –5V for audio bias, with Skyhook enabling stable high-side switch operation across cold-crank conditions. Use Value: Wide 2.6–50V input range accommodates load-dump transients; H-grade temp rating ensures reliability at dashboard temperatures exceeding 105°C. |
| Test Equipment Local Power Supply | Medical Imaging Sensor Bias |
|
Use Scenario: On-board power for FPGA I/O banks and analog front-ends in portable oscilloscopes requiring clean ±5V from Li-ion battery pack. IC Role / Device Role / Timing Role: Dual buck converter delivering regulated +5V and –5V with independent soft-start (SS1/SS2) to prevent inrush-induced rail collapse. Use Value: Independent channel control avoids cross-regulation; PG1/PG2 flags enable sequenced power-up of FPGA core and peripherals. |
Use Scenario: Biasing photodiode arrays and low-noise preamps in ultrasound probe electronics where EMI-sensitive analog paths coexist with digital controllers. IC Role / Device Role / Timing Role: Operated in SEPIC + inverting mode to generate isolated ±5V from 3.3V system rail, minimizing conducted noise coupling into signal chain. Use Value: Integrated Skyhook eliminates external boost IC; fixed-frequency PWM reduces spectral noise near sensitive IF bands used in echo processing. |
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 |
|---|---|---|---|
| LTC3892EUF#PBF | Two 5V-biased N-channel MOSFET controllers (no integrated switches); requires external FETs and gate drivers; supports up to 60V input. | Better suited for high-efficiency, high-current (>5A) designs where thermal management favors discrete FETs over integrated NPNs. | Select LTC3892EUF#PBF when higher efficiency, lower conduction loss, or >2A per channel is required - but expect added BOM count and layout complexity. |
| LT8330EDD#TRPBF | Single-channel 50V, 1.5A monolithic boost/SEPIC/inverting controller with integrated 1.5A switch; no dual-channel or Skyhook capability. | Applicable only for single-rail generation; lacks anti-phase operation, independent channel control, and negative rail support out-of-box. | Choose LT8330EDD#TRPBF for cost-sensitive, single-output applications where dual-channel functionality is unnecessary and board space is extremely constrained. |
Compared with LTC3892EUF#PBF and LT8330EDD#TRPBF, the LT8471HFE#TRPBF uniquely integrates dual 2A NPN switches, Skyhook boost, and anti-phase timing in one H-grade package - making it optimal for compact, thermally demanding dual-rail systems where BOM simplification and guaranteed 150°C operation are mandatory.
Availability
LT8471HFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, test equipment, medical imaging, and aerospace subsystems requiring stable component supply with extended temperature qualification.
Supply support for LT8471HFE#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 and maintains full product support, datasheet documentation, and application engineering for legacy Linear parts including the LT8471 family.
The LT8471 product line was designed specifically for high-density, multi-topology local power conversion in harsh environments - emphasizing integration of dual switching channels, Skyhook-assisted high-side drive, and extended temperature reliability without external components.
FAQ
What is the maximum operating junction temperature for the LT8471HFE#TRPBF?
The LT8471HFE#TRPBF is rated for continuous operation from –40°C to +150°C junction temperature. This H-grade qualification is fully guaranteed per datasheet specifications, with thermal shutdown activating at ~164°C and automatic recovery below ~162.5°C. The 20-lead TSSOP package with exposed pad achieves θJA = 38°C/W, supporting sustained 2A channel operation within this range when properly heatsinked.
Can the LT8471HFE#TRPBF generate both positive and negative outputs simultaneously?
Yes, the LT8471HFE#TRPBF can generate simultaneous positive and negative outputs - for example, +5V and –5V from a single 6–32V input rail. This is achieved by configuring Channel 1 as a buck converter and Channel 2 as an inverting converter, leveraging independent FB1/FB2 feedback networks and separate PG1/PG2 status flags. The typical application circuit on page 1 of the datasheet demonstrates this exact configuration.
How does the Skyhook channel function in the LT8471HFE#TRPBF?
The Skyhook channel in the LT8471HFE#TRPBF is a dedicated 500mA voltage-mode boost regulator that generates a fixed +4.25V (typ) above the C2 pin voltage. It powers the base of high-side NPN switches in buck, ZETA, or single-inductor inverting topologies - eliminating external charge pumps. When unused, C3 must be tied to GND to disable Skyhook and reduce VIN1 quiescent current from 2.4mA to 2.2mA.
What is the purpose of anti-phase switching in the LT8471HFE#TRPBF?
Anti-phase switching in the LT8471HFE#TRPBF configures Channel 2's clock ~180° out-of-phase with Channel 1, reducing RMS input ripple current by up to 70%. This allows smaller input bulk capacitors, lowers EMI filter requirements, and improves thermal performance in high-current dual-rail designs - especially critical in space-constrained industrial and automotive applications.
Does the LT8471HFE#TRPBF support external clock synchronization?
Yes, the LT8471HFE#TRPBF supports full external clock synchronization via the SYNC pin (Pin 9). It accepts a 100kHz–2MHz digital clock signal with 35–65% duty cycle and toggles both channels synchronously. Driving SYNC low reverts operation to the internal RT-set oscillator. This feature prevents beat frequencies in multi-converter systems and enables EMI spread-spectrum alignment in noise-sensitive applications.
LT8471HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8471HFE#TRPBF FAQ
1.How can I place an order for LT8471HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471HFE#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 LT8471HFE#TRPBF reliable?
The price and inventory of LT8471HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8471HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471HFE#TRPBF?
LT8471HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471HFE#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 LT8471HFE#TRPBF?
For technical support, including LT8471HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471HFE#TRPBF requirements.
6.How does Aetrix verify that LT8471HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8471HFE#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 LT8471HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8471HFE#TRPBF?
All LT8471HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471HFE#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 LT8471HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8471HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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