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Analog Devices Inc. LT8471IFE#PBF
- Part No.:
- LT8471IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471IFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:378
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Product details
Overview
LT8471IFE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, 2A/50V 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 outputs from 6–32V input, and operates from –40°C to +125°C in 20-lead TSSOP package.
For engineers reviewing the LT8471IFE#PBF datasheet, LT8471IFE#PBF pinout, LT8471IFE#PBF application, or LT8471IFE#PBF equivalent, this page provides verified topology flexibility, anti-phase switching for reduced input ripple, programmable UVLO/OVLO, soft-start per channel, and Skyhook-enabled high-side buck operation - all critical for local dual-rail power design.
Technical Context
The LT8471IFE#PBF implements two independent current-mode controlled PWM channels with internal 2A, 50V NPN switches and a third voltage-mode Skyhook boost channel (500mA, 50V) that regulates SHOUT to +4.25V above C2. Each primary channel supports six topologies and features anti-phase clocking (170°–200° phase shift) to minimize input capacitor RMS current.
It integrates programmable oscillator (100kHz–2MHz via RT resistor or external SYNC), frequency foldback during startup, open-drain PG1/PG2 with ±7.5% trip thresholds, and dual-input UVLO/OVLO configurable via OV/UV pin. Thermal shutdown activates at ~164°C with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V on VIN1/VIN2 - supports wide industrial and automotive input rails |
| Primary Switch Rating | 2.1A min / 2.55A typ / 3.2A max per channel - enables robust 2A continuous output with margin |
| Skyhook Output | Regulated to 4.25V above C2 pin - supplies boosted gate drive for high-side buck/ZETA configurations |
| Switching Frequency | 100kHz–2MHz (free-running or synchronized) - balances EMI, size, and efficiency trade-offs |
| Feedback Reference | +789mV / –788mV (typ) - precise dual-polarity regulation for positive/negative outputs |
| Power Good Threshold | ±7.5% of target VOUT - ensures reliable system sequencing and fault detection |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial environments |
Pinout & Package
LT8471IFE#PBF is housed in a 20-lead plastic TSSOP (FE package) 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 switch collectors | Connect to inductor/diode nodes; require minimized trace area for EMI control |
| E1, E2 (Pins 2, 19) | Primary switch emitters | Ground reference for low-side configs; float or tie to rail in high-side topologies |
| VIN1, VIN2 (Pins 3, 18) | Channel power inputs | VIN1 powers both channels + Skyhook; VIN2 powers Channel 2 only |
| FB1, FB2 (Pins 5, 16) | Output voltage sense inputs | Interface with resistor dividers to set +789mV or –788mV regulated output |
| PG1, PG2 (Pins 4, 17) | Open-drain power-good indicators | Pull high externally; go low when VOUT drops >7.5% from target |
| OV/UV (Pin 6) | Programmable UVLO/OVLO input | Enable/disable device or configure lockout thresholds via resistor divider |
| RT (Pin 7) | Oscillator timing resistor | Set free-running frequency (fOSC = 85.5/(RT+1) MHz) - RT to GND |
| SS1, SS2 (Pins 8, 15) | Soft-start control inputs | Charge external capacitors to ramp duty cycle and limit inrush current |
| SYNC (Pin 9) | External clock input | Accepts 100kHz–2MHz digital clock; <0.4V reverts to internal oscillator |
| SHOUT (Pin 14) | Skyhook boost output | Provides +4.25V above C2 for high-side switch base drive; requires Schottky diode |
| C3 (Pin 13) | Skyhook switch collector | Must tie to GND if Skyhook disabled; otherwise connects to Skyhook inductor |
Key Features
| Feature | Design Value |
|---|---|
| Dual multitopology capability | Each 2A channel independently configured as buck, boost, SEPIC, ZETA, flyback, or inverting - eliminates need for multiple controllers |
| Integrated Skyhook boost | On-chip 500mA boost regulator generates +4.25V above C2 to enable high-side buck/ZETA without external charge pump |
| Anti-phase switching | ~180° phase shift between channels reduces input ripple current by up to 70%, allowing smaller input capacitors |
| Programmable UVLO/OVLO | Single OV/UV pin supports user-defined undervoltage and overvoltage lockout thresholds via external resistor divider |
| Per-channel soft-start | Independent SS1/SS2 pins allow staggered or matched startup timing - critical for sequencing dual-rail systems |
| Frequency foldback | Reduces fOSC by factor of 8 during startup to extend minimum on-time and improve control at light loads |
Applications
| Industrial Dual-Rail Signal Chain | Automotive Infotainment Power |
|---|---|
Use Scenario: Powering precision ADCs, DACs, and op-amps requiring clean ±5V rails from a 12V vehicle battery or 24V industrial bus. IC Role / Device Role / Timing Role: LT8471IFE#PBF acts as dual-output, topology-flexible DC/DC controller generating tightly regulated positive and negative supplies with synchronized anti-phase switching. Use Value: Eliminates discrete charge pumps or dual ICs; ±7.5% PG accuracy ensures reliable analog subsystem reset and monitoring. |
Use Scenario: Supplying head unit SoC core (1.2V) and display bias (–5V) from variable 6–16V automotive input with cold-crank tolerance. IC Role / Device Role / Timing Role: LT8471IFE#PBF configures Channel 1 as buck (for 1.2V) and Channel 2 as inverting (for –5V), leveraging wide 2.6–50V input range and programmable UVLO. Use Value: Skyhook enables stable high-side buck operation during cranking; anti-phase switching maintains low EMI in RF-sensitive cabin environment. |
| Medical Imaging Sensor Bias | Test Equipment Dual-Output PSU |
Use Scenario: Generating isolated ±15V bias for CCD/CMOS image sensor arrays in portable ultrasound devices powered from Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: LT8471IFE#PBF operates Channel 1 as boost (for +15V) and Channel 2 as flyback (for –15V), using internal 50V switches to avoid external HV MOSFETs. Use Value: Integrated 2A switches and 50V rating reduce BOM count; thermal shutdown protects against transient overloads during probe movement. |
Use Scenario: Embedded bench power supply module delivering adjustable +12V/–12V outputs from universal 100–240VAC input (after front-end rectification). IC Role / Device Role / Timing Role: LT8471IFE#PBF serves as secondary-side dual-output controller in offline SMPS, configured as buck (for +12V) and inverting (for –12V) with SYNC locked to primary controller. Use Value: Synchronization prevents beat frequencies; PG1/PG2 signals feed system microcontroller for real-time rail health monitoring. |
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 5V gate drivers; no integrated switches; supports up to 60V input; requires external MOSFETs | Better suited for high-efficiency, high-current (>5A) designs where layout control and thermal management are critical | Select when higher efficiency, lower quiescent current (<15μA), or >2A output capability is required - not a drop-in replacement |
| TPS54560QDGQRQ1 | Single-channel 60V buck controller; no inverting/Skyhook capability; AEC-Q100 qualified; fixed 500kHz frequency | Targeted for automotive single-rail applications only; lacks dual-output or negative rail generation capability | Choose only for cost-sensitive, single-output automotive buck designs - cannot replace LT8471IFE#PBF's dual topology or Skyhook functions |
Compared with LTC3892EFE#PBF and TPS54560QDGQRQ1, the LT8471IFE#PBF uniquely integrates dual 2A switches, Skyhook boost, and six topology options in one package - enabling compact dual-rail solutions without external FETs or auxiliary regulators, while maintaining industrial temperature range and programmable protection.
Availability
LT8471IFE#PBF is available at Aetrix Electronics and suitable for industrial automation, medical imaging, test equipment, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8471IFE#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 LT8471IFE#PBF belongs to Linear's high-voltage dual-controller product line, designed specifically for space-constrained, multi-topology local power conversion in signal chain, instrumentation, and harsh-environment applications.
FAQ
What topologies does the LT8471IFE#PBF support per channel?
The LT8471IFE#PBF supports buck, boost, SEPIC, ZETA, flyback, and inverting DC/DC converter topologies independently on each of its two primary channels. This flexibility allows designers to generate positive, negative, or split outputs from a single input rail without changing ICs - for example, configuring Channel 1 as buck for +5V and Channel 2 as inverting for –5V. The Skyhook channel further enables high-side switch operation in buck and ZETA modes.
How does the Skyhook channel function in the LT8471IFE#PBF?
The Skyhook channel in the LT8471IFE#PBF is a dedicated 500mA, constant-frequency voltage-mode boost regulator that delivers a regulated output (SHOUT) at +4.25V above the C2 pin voltage. It powers the base drive of high-side NPN switches in buck or ZETA configurations, eliminating the need for 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 LT8471IFE#PBF?
Anti-phase switching in the LT8471IFE#PBF means Channel 2's clock is intentionally delayed ~180° relative to Channel 1's clock. This reduces input capacitor RMS current by up to 70%, allowing smaller, lower-ESR input capacitors and lowering conducted EMI - especially valuable in noise-sensitive applications like RF modules or precision analog systems where clean input rails are critical.
Can the LT8471IFE#PBF operate with input voltages below 6V?
Yes, the LT8471IFE#PBF supports an input voltage range of 2.6V to 50V on both VIN1 and VIN2. Its ability to start and regulate from as low as 2.6V makes it suitable for single-cell Li-ion (3.0–4.2V) or 3.3V system rail applications - provided the selected topology (e.g., boost or SEPIC) matches the input-to-output requirement. Minimum operating voltage is enforced by internal UVLO circuitry.
How is power good signaling implemented in the LT8471IFE#PBF?
The LT8471IFE#PBF provides two open-drain power good outputs - PG1 and PG2 - each tied to its respective channel's feedback pin. They assert low when the corresponding output voltage falls more than 7.5% below its target (e.g., FB1 < 730mV for +5V output), and release high when regulation is restored above 92.5% of target. External pull-up resistors are required, and PG status is only valid when VIN1 > 2.6V and the channel is enabled.
LT8471IFE#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
LT8471IFE#PBF FAQ
1.How can I place an order for LT8471IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471IFE#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 LT8471IFE#PBF reliable?
The price and inventory of LT8471IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8471IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471IFE#PBF?
LT8471IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471IFE#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 LT8471IFE#PBF?
For technical support, including LT8471IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471IFE#PBF requirements.
6.How does Aetrix verify that LT8471IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8471IFE#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 LT8471IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8471IFE#PBF?
All LT8471IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471IFE#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 LT8471IFE#PBF part is unused and in its original packaging.
Return procedure for LT8471IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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