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Analog Devices Inc. LT8471EFE#PBF
- Part No.:
- LT8471EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471EFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,025
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Product details
Overview
LT8471EFE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel 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 topologies per channel, enabling ±5V dual-rail generation from a 6–32V input. Designed for local signal-chain power supplies requiring high-voltage flexibility and anti-phase switching to reduce input ripple.
For engineers reviewing the LT8471EFE#PBF datasheet, LT8471EFE#PBF pinout, LT8471EFE#PBF application, or LT8471EFE#PBF equivalent, key selection considerations include its 2.6–50V input range, programmable 100kHz–2MHz switching frequency via RT pin or SYNC, dual-channel soft-start control, integrated power-good monitoring (PG1/PG2), and Skyhook-enabled high-side switch support for buck/ZETA/inverting configurations.
Technical Context
The LT8471EFE#PBF implements constant-frequency current-mode control on both primary channels, with channel 2 clock phase shifted ~180° relative to channel 1 to minimize input ripple. Each channel features independent error amplifiers, peak-current sensing, and VC1/VC2 voltage clamping for current limiting.
Its Skyhook channel operates as a fixed-frequency voltage-mode boost regulator, delivering regulated output at 4.25V (typ) above C2 - essential for driving high-side NPN bases in buck/ZETA/single-inductor inverting topologies. The device integrates frequency foldback during startup, thermal shutdown (~164°C trip), and programmable UVLO/OVLO via the OV/UV pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V - supports wide industrial and automotive input rails without external pre-regulation. |
| Primary Switch Rating | 2A, 50V NPN - enables robust buck/boost/SEPIC up to 100W per channel with external magnetics. |
| Skyhook Switch Rating | 500mA, 50V NPN - provides boosted gate drive for high-side configurations without discrete charge pumps. |
| Switching Frequency Range | 100kHz to 2MHz - adjustable via RT resistor or external SYNC clock for EMI optimization and size reduction. |
| Feedback Reference Voltage | +789mV / –788mV - precise dual-polarity reference enables accurate positive/negative output regulation. |
| Power Good Threshold Accuracy | ±7.5% of target output - open-drain PG1/PG2 signals indicate valid regulation with hysteresis for system sequencing. |
| Operating Junction Temp | –40°C to +125°C - qualified for extended industrial temperature operation (E-grade). |
Pinout & Package
LT8471EFE#PBF is housed in a 20-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 21 = GND). All ground pins (10, 11, 12, and exposed pad) must be soldered directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (Pins 1, 20) | Primary channel collector outputs | Connect to inductor/diode nodes; require minimized trace area for EMI control; C2 ties to Skyhook input when enabled. |
| E1, E2 (Pins 2, 19) | Primary channel emitter terminals | Ground reference for internal NPN switches; floating in high-side configs; minimize trace area to reduce noise coupling. |
| VIN1, VIN2 (Pins 3, 18) | Channel power inputs | VIN1 powers Channel 1, Skyhook, and bias circuitry; VIN2 powers Channel 2 only; both require local bypassing. |
| FB1, FB2 (Pins 5, 16) | Output voltage feedback inputs | Resistor-divider interface for setting +5V or –5V outputs; ±7.5% PG threshold referenced to these pins. |
| OV/UV (Pin 6) | Programmable enable/disable pin | Configurable UVLO/OVLO using external resistor divider; 1.215V typical turn-on threshold. |
| RT (Pin 7) | Oscillator timing input | Resistor-to-ground sets free-running frequency (fOSC = 85.5/(RT + 1) MHz); floating not allowed. |
| SS1, SS2 (Pins 8, 15) | Soft-start control inputs | Capacitor-connected pins for controlled ramp-up of duty cycle and current limit during startup. |
| SYNC (Pin 9) | External clock synchronization input | Digital input (1.3V high / 0.4V low) to lock switching frequency to external source; <0.4V reverts to internal oscillator. |
| PG1, PG2 (Pins 4, 17) | Open-drain power-good outputs | Pulled low when respective output falls >7.5% below target; require external pull-up resistors for system monitoring. |
| SHOUT (Pin 14) | Skyhook boost output | Regulated cathode of internal Schottky diode; delivers ~4.25V above C2 for high-side base drive. |
| C3 (Pin 13) | Skyhook collector | Internal 500mA NPN switch collector; tie to GND to disable Skyhook and reduce quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent topology support | Each channel configurable as buck, boost, SEPIC, ZETA, flyback, or inverting - eliminates need for multiple controllers in multi-rail systems. |
| Anti-phase switching | ~180° phase shift between channels reduces RMS input ripple current by up to 70%, easing input capacitor sizing. |
| Integrated Skyhook boost | On-chip 500mA boost converter generates stable voltage above C2 - enables reliable high-side NPN drive without external components. |
| Programmable UVLO/OVLO | Single-pin OV/UV interface with user-defined thresholds - simplifies input rail supervision and fault protection logic. |
| Frequency foldback during startup | Reduces switching frequency by factor of 2–8 when FB voltage is low - improves controllability and limits inrush current. |
Applications
| Industrial Signal Chain Power | Automotive Infotainment Supply |
|---|---|
Use Scenario: Generating ±5V rails for precision ADCs, DACs, and op-amps in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-rail DC/DC controller providing isolated, low-noise analog supply with coordinated soft-start and power-good sequencing. Use Value: Eliminates need for separate positive/negative converters; anti-phase operation cuts input capacitance by >50% versus synchronous designs. |
Use Scenario: Powering display backlight drivers and audio codecs from 9–16V battery with transient tolerance. IC Role / Device Role / Timing Role: Wide-input dual converter supporting buck (for 5V logic) and inverting (for –5V bias) with UVLO tracking cold-crank conditions. Use Value: 2.6V minimum start-up enables operation during cranking; Skyhook ensures stable high-side drive even at 6V input. |
| Medical Sensor Interface | Test & Measurement Equipment |
Use Scenario: Local ±5V generation for isolated sensor front-ends in portable ECG monitors. IC Role / Device Role / Timing Role: Compact dual-output controller with low quiescent current (2.2mA VIN1, Skyhook disabled) and thermal shutdown for safety-critical use. Use Value: Meets IEC 60601 leakage requirements via galvanic isolation in inverting topology; no external boost components required. |
Use Scenario: Dual-rail supply for high-speed comparators and FPGA I/O banks in benchtop analyzers. IC Role / Device Role / Timing Role: Synchronized dual-channel controller allowing precise timing alignment between positive and negative rails. Use Value: SYNC pin enables deterministic switching edge alignment across channels - critical for jitter-sensitive measurement circuits. |
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 |
|---|---|---|---|
| LTC3892EFE#PBF | Two independent 60V synchronous buck controllers; no integrated switches; requires external MOSFETs. | Better efficiency (>95%) and higher current capability (10A+ per channel), but needs more external components and layout space. | Choose for high-efficiency, high-current buck-only applications where board area and BOM count are secondary to thermal performance. |
| MAX20406ATJ+T | Single 5.5V-input, dual-output buck controller with integrated 4A/2A FETs; fixed 2.1MHz frequency; no inverting/Skyhook capability. | Smaller footprint and simpler design for low-voltage dual-buck only; lacks high-voltage support and topology flexibility. | Choose for compact, cost-sensitive 3.3V/1.8V dual-rail systems powered from USB or LDO outputs - not suitable for ±5V or >6V inputs. |
Compared with LTC3892EFE#PBF and MAX20406ATJ+T, the LT8471EFE#PBF uniquely combines integrated 2A/500mA NPN switches, ±50V capability, Skyhook-assisted high-side drive, and full topology flexibility - making it the only option among the three capable of generating true bipolar rails from a single wide-input source without external charge pumps or level shifters.
Availability
LT8471EFE#PBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed -40°C to +125°C operation.
Supply support for LT8471EFE#PBF 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, documentation, and manufacturing continuity for the LT® portfolio.
The LT8471 belongs to Linear's high-voltage multitopology DC/DC controller family, designed specifically for space-constrained, wide-input applications needing dual independent outputs with flexible polarity and configuration - especially where discrete switch integration and Skyhook-assisted high-side drive simplify power architecture.
FAQ
What topologies does the LT8471EFE#PBF support on each channel?
The LT8471EFE#PBF supports buck, boost, SEPIC, ZETA, flyback, and inverting DC/DC topologies independently on Channel 1 and Channel 2. Its integrated 2A NPN switches and Skyhook boost channel enable all these configurations without external high-voltage transistors. The LT8471EFE#PBF datasheet confirms this in the "Features" and "Operation" sections, with schematic examples for buck/boost and invert/invert combinations.
How does the Skyhook channel function in the LT8471EFE#PBF?
The Skyhook channel in the LT8471EFE#PBF is an integrated 500mA boost regulator that generates a voltage ~4.25V above the C2 pin. It supplies boosted 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. The LT8471EFE#PBF block diagram and "Skyhook Channel" section detail its voltage-mode control and internal Schottky diode.
What is the purpose of the OV/UV pin on the LT8471EFE#PBF?
The OV/UV pin on the LT8471EFE#PBF serves as a programmable enable/disable input. Applying ≥1.215V (typ) enables operation; grounding disables the device. Configured with an external resistor divider, it provides user-defined undervoltage lockout (UVLO) and overvoltage lockout (OVLO) thresholds. The LT8471EFE#PBF Electrical Characteristics table specifies ±50mV accuracy over temperature for this function.
Can the LT8471EFE#PBF synchronize both channels to an external clock?
Yes - the LT8471EFE#PBF uses a single SYNC pin (Pin 9) to synchronize the entire device, including both primary channels and the Skyhook channel, to an external clock signal. The SYNC input accepts 100kHz–2MHz digital signals with 35–65% duty cycle; driving it below 0.4V reverts to the internal RT-set oscillator. This is confirmed in the "Clock Synchronization" section of the LT8471EFE#PBF datasheet.
What package and thermal characteristics apply to the LT8471EFE#PBF?
The LT8471EFE#PBF uses a 20-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 21 = GND). Its thermal resistance is θJA = 38°C/W. The exposed pad must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance. This package variant is explicitly listed in the "Order Information" table of the LT8471EFE#PBF datasheet under part number LT8471EFE#PBF.
LT8471EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8471EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471EFE#PBF 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#PBF reliable?
The price and inventory of LT8471EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8471EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471EFE#PBF?
LT8471EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471EFE#PBF 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#PBF?
For technical support, including LT8471EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471EFE#PBF requirements.
6.How does Aetrix verify that LT8471EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8471EFE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8471EFE#PBF?
All LT8471EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471EFE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8471EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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