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Analog Devices Inc. LT8471IFE#TRPBF
- Part No.:
- LT8471IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471IFE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
LT8471IFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel PWM DC/DC converter 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 simultaneous positive and negative output generation (e.g., +5V/–5V) from a single 6V–32V input. Designed for local power supply rails in signal chain and industrial embedded systems.
For engineers reviewing the LT8471IFE#TRPBF datasheet, LT8471IFE#TRPBF pinout, LT8471IFE#TRPBF application, or LT8471IFE#TRPBF equivalent, key selection considerations include its dual 2A switch capability, programmable 100kHz–2MHz switching frequency via RT pin or SYNC, anti-phase operation to reduce input ripple, and integrated power good (PG1/PG2), soft-start (SS1/SS2), and UVLO/OVLO on OV/UV pin.
Technical Context
The LT8471IFE#TRPBF implements current-mode control for both primary channels with independent error amplifiers, VC1/VC2 voltage clamping for current limiting, and 180° anti-phase clocking between channels to minimize input capacitor RMS current. Its Skyhook channel operates in voltage-mode, delivering a regulated ~4.25V boost above C2 to support high-side switch configurations (e.g., buck, ZETA).
It features frequency foldback during startup (1/2, 1/4, or 1/8 of nominal fOSC) to improve low-duty-cycle control, internal thermal shutdown (~164°C trip), and precise ±7.5% power-good detection referenced to FB1/FB2 thresholds (±789 mV / –788 mV typical). VIN1 powers all circuitry including Skyhook and Channel 1; VIN2 powers only Channel 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V on VIN1; 2.6V to 50V on VIN2 - supports wide-input industrial and automotive front-end supplies. |
| Primary Switch Rating | 2 × 2A, 50V NPN - enables 5W–15W per channel in buck/boost with external magnetics. |
| Skyhook Switch Rating | 500mA, 50V NPN with integrated Schottky - delivers regulated ~4.25V boost above C2 for high-side gate drive. |
| Switching Frequency | 100kHz to 2MHz (RT-set or SYNC-synchronized) - balances EMI, size, and efficiency; anti-phase reduces input ripple. |
| Feedback Reference | +789 mV / –788 mV (typ) at FB1/FB2 - enables precise ±1% output regulation with external resistor dividers. |
| Power Good Accuracy | ±7.5% window around FB threshold - provides reliable rail monitoring without external comparators. |
| Operating Temp Range | –40°C to +125°C (I-grade) - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
LT8471IFE#TRPBF is packaged in a 20-lead plastic TSSOP (FE package) with exposed pad (Pin 21) soldered to PCB for thermal and electrical grounding. Pin count, layout, and thermal metrics (θJA = 38°C/W) match Linear Technology's standard FE footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (Pins 1, 20) | Primary channel collector outputs | Connect to inductor/diode nodes; must be bypassed if DC-biased; minimized trace area required for EMI control. |
| E1, E2 (Pins 2, 19) | Primary channel emitter connections | Return path for 2A switches; tied to ground in low-side configs; float in high-side topologies. |
| VIN1 (Pin 3), VIN2 (Pin 18) | Input supply rails | VIN1 powers entire IC including Skyhook and Channel 1; VIN2 powers only Channel 2 - enables independent channel enable/disable. |
| FB1, FB2 (Pins 5, 16) | Output voltage sense inputs | Accept resistor divider feedback; ±789 mV / –788 mV reference enables accurate ±5V, ±12V, or custom rail regulation. |
| PG1, PG2 (Pins 4, 17) | Open-drain power-good indicators | Pull-high externally; go low when output falls >7.5% below target - used for system sequencing and fault reporting. |
| SS1, SS2 (Pins 8, 15) | Soft-start timing inputs | Charge via internal 250kΩ to ~2.15V; external capacitor (100nF–1µF) controls ramp rate and peak inrush current. |
| OV/UV (Pin 6) | Programmable UVLO/OVLO input | Resistor-divider programmable turn-on (1.215V typ) and shutdown thresholds - supports input rail supervision. |
| RT (Pin 7) | Oscillator timing resistor | Resistor to GND sets free-running frequency per fOSC = 85.5/(RT + 1) MHz - enables precise EMI band avoidance. |
| SYNC (Pin 9) | External clock input | Accepts 100kHz–2MHz digital clock; high-level >1.3V, low-level <0.4V; duty cycle 35–65% required. |
| SHOUT (Pin 14) | Skyhook regulated output | Fixed ~4.25V above C2; supplies boosted voltage to VIN1/VIN2 in high-side configurations (e.g., buck). |
| C3 (Pin 13) | Skyhook collector | Connect to GND to disable Skyhook; otherwise ties to inductor/diode node - enables or disables auxiliary boost. |
| GND (Pins 10–12, EP 21) | Ground terminals | All GND pins and exposed pad must be soldered to local ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A, 50V NPN switches | Enables independent multitopology conversion (buck/boost/SEPIC/flyback/inverting) per channel without external transistors. |
| Integrated 500mA Skyhook boost | Generates regulated ~4.25V above C2 to drive high-side switches in buck/ZETA topologies - eliminates external charge pump. |
| Anti-phase channel switching | Reduces input capacitor RMS current by up to 30% versus in-phase operation - lowers input ripple and extends capacitor life. |
| Programmable UVLO/OVLO | Single-pin (OV/UV) resistor-divider configuration enables customizable input rail lockout - simplifies power sequencing design. |
| Frequency foldback at startup | Automatically reduces switching frequency (to 1/2, 1/4, or 1/8) when FB voltage is low - improves controllability during soft-start and light-load conditions. |
| Thermal shutdown with hysteresis | Trips at ~164°C and resets at ~162.5°C - protects internal switches and external components during overload or poor heatsinking. |
Applications
| Industrial Signal Chain Power | Automotive Infotainment Rails |
|---|---|
Use Scenario: Generating isolated ±5V and ±12V rails for precision ADCs, DACs, and op-amps in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller managing independent buck and inverting converters from a 24V bus. Use Value: Eliminates need for discrete boost/buck controllers and external MOSFETs; anti-phase operation reduces 24V input filter size by 40%. |
Use Scenario: Providing clean +5V for microcontrollers and –5V for analog audio codecs in head-unit designs with 9V–16V battery input. IC Role / Device Role / Timing Role: Multitopology regulator implementing buck (for +5V) and inverting (for –5V) from same input, synchronized to avoid AM-band interference. Use Value: Meets CISPR-25 Class 5 EMI limits via 1.8MHz SYNC locking; integrated PG pins simplify boot-up sequencing with SoC. |
| Medical Sensor Interface Supply | Test Equipment Dual-Rail Generation |
Use Scenario: Delivering low-noise ±15V for photodiode transimpedance amplifiers and analog front-ends in portable ultrasound probes. IC Role / Device Role / Timing Role: Dual inverting converter generating symmetric rails from a 3.7V Li-ion battery via boost-invert architecture. Use Value: Skyhook enables efficient high-side switch drive in boost stage; 125°C rating supports sealed enclosure thermal profiles. |
Use Scenario: Creating adjustable ±10V to ±24V rails for calibration sources and DMM reference circuits in benchtop instruments. IC Role / Device Role / Timing Role: Configurable SEPIC + inverting pair allowing wide input (12V–36V) and precise, load-independent dual-rail outputs. Use Value: RT-programmable frequency avoids 13.56MHz RFID band; integrated soft-start prevents relay chatter during power-up. |
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 | Dual synchronous buck controller (no integrated switches); supports up to 60V input; requires external MOSFETs. | Better suited for high-current (>10A), high-efficiency buck-only designs; lacks inverting/Skyhook capability. | Select LTC3892EUF#PBF when efficiency >95% and >5A per rail are required; LT8471IFE#TRPBF preferred for space-constrained multitopology needs. |
| MAX20406ATGB/VY+ | Single-channel 2.5A buck controller with integrated FETs; no second channel or Skyhook; supports 3.0V–22V input. | Targeted at compact single-rail applications; cannot generate negative voltages or support dual independent topologies. | Choose MAX20406ATGB/VY+ for cost-sensitive, single-output 5V/3.3V systems; LT8471IFE#TRPBF remains optimal for dual-rail, ±V generation. |
Compared with LTC3892EUF#PBF and MAX20406ATGB/VY+, the LT8471IFE#TRPBF uniquely integrates dual 2A switches, Skyhook boost, and full topology flexibility in one 20-lead TSSOP - reducing BOM count by ≥7 components versus controller+FET solutions while enabling ±V generation impossible with buck-only alternatives.
Availability
LT8471IFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8471IFE#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, datasheets, and application engineering for legacy Linear parts including the LT8471 series.
The LT8471 belongs to Linear's high-voltage, multitopology DC/DC controller family, designed specifically for space-constrained local power supplies needing dual independent rails - especially where ±V generation, wide input range, and integrated Skyhook functionality are critical.
FAQ
What topologies can each channel of the LT8471IFE#TRPBF support?
The LT8471IFE#TRPBF supports buck, boost, SEPIC, ZETA, flyback, and inverting topologies independently on Channel 1 and Channel 2. Its dual 2A NPN switches and Skyhook boost channel enable these configurations without external power transistors. High-side topologies (buck, ZETA, single-inductor inverting) require Skyhook-enabled voltage boosting at SHOUT, while low-side topologies (boost, SEPIC, flyback) operate directly from VIN1/VIN2.
How does the Skyhook channel function in the LT8471IFE#TRPBF?
The Skyhook channel in the LT8471IFE#TRPBF is a dedicated 500mA, voltage-mode boost converter that regulates SHOUT to ~4.25V above the C2 pin voltage. It supplies boosted gate drive voltage to VIN1 and/or VIN2 when those pins are used in high-side switch configurations (e.g., buck). When not needed, C3 is tied to GND to disable Skyhook and reduce quiescent current from VIN1.
What is the purpose of anti-phase switching in the LT8471IFE#TRPBF?
Anti-phase switching in the LT8471IFE#TRPBF means Channel 2's clock is approximately 180° out-of-phase with Channel 1's clock. This reduces RMS current stress and voltage ripple on the shared input capacitor by canceling harmonic components - improving EMI performance and allowing smaller input bulk capacitance compared to in-phase operation.
Can the LT8471IFE#TRPBF generate negative output voltages?
Yes, the LT8471IFE#TRPBF can generate negative output voltages using inverting, SEPIC, or flyback topologies on either channel. For example, a typical application configures Channel 1 as buck (+5V) and Channel 2 as inverting (–5V) from a 6V–32V input. The FB2 pin's –788 mV reference enables precise regulation of negative rails without polarity-reversal circuitry.
What are the thermal requirements for the LT8471IFE#TRPBF in a 20-lead TSSOP package?
The LT8471IFE#TRPBF in the 20-lead TSSOP (FE) package has θJA = 38°C/W. To maintain ≤125°C junction temperature at full 2A load per channel, the PCB must include a minimum 200mm² copper pour connected to the exposed pad (Pin 21), multiple thermal vias to inner ground planes, and ambient temperature ≤85°C. Thermal shutdown activates at ~164°C with 1.5°C hysteresis.
LT8471IFE#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
LT8471IFE#TRPBF FAQ
1.How can I place an order for LT8471IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471IFE#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 LT8471IFE#TRPBF reliable?
The price and inventory of LT8471IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8471IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471IFE#TRPBF?
LT8471IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471IFE#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 LT8471IFE#TRPBF?
For technical support, including LT8471IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471IFE#TRPBF requirements.
6.How does Aetrix verify that LT8471IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8471IFE#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 LT8471IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8471IFE#TRPBF?
All LT8471IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471IFE#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 LT8471IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8471IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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