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Analog Devices Inc. LT8471HFE#PBF
- Part No.:
- LT8471HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8471HFE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LT8471HFE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, 50V, 2A PWM DC/DC converter IC with integrated Skyhook boost channel (500mA), configurable as buck, boost, SEPIC, flyback, or inverting topologies. It supports ±5V dual-rail generation from 6–32V input and operates up to 150°C junction temperature in 20-lead TSSOP package.
For engineers reviewing the LT8471HFE#PBF datasheet, LT8471HFE#PBF pinout, LT8471HFE#PBF application, or LT8471HFE#PBF equivalent, key selection factors include dual independent topology flexibility, anti-phase switching for reduced input ripple, programmable UVLO/OVLO via OV/UV pin, soft-start per channel, and synchronization capability across 100kHz–2MHz range.
Technical Context
The LT8471HFE#PBF integrates two current-mode controlled 2A NPN power switches with independent feedback loops (FB1/FB2), each supporting buck, boost, SEPIC, ZETA, flyback, or inverting configurations. Channel 2 clock is ~180° out-of-phase with Channel 1 to minimize input ripple.
It includes a dedicated voltage-mode Skyhook boost channel (C3/SHOUT) delivering regulated +4.25V above C2 for high-side switch biasing, with internal Schottky diode and 500mA current limit. Oscillator frequency is set by RT-to-GND resistor or synchronized externally via SYNC pin with 35–65% duty cycle requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 50V - supports wide industrial input rails including 12V, 24V, and 48V systems. |
| Primary Switch Rating | 2 × 2A, 50V NPN - enables high-current buck/boost conversion without external switches. |
| Skyhook Output | +4.25V (typ) above C2 - provides self-biasing voltage for high-side NPN base drive in buck/ZETA topologies. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT resistor or external SYNC signal; foldback reduces min duty cycle during startup. |
| Feedback Reference | +789mV / –788mV - precise dual-polarity reference enables stable positive and negative output regulation. |
| Operating Temp Range | –40°C to +150°C - H-grade qualification ensures reliability in automotive under-hood and industrial high-temp environments. |
| Power Good Threshold | ±7.5% window (FB rising/falling) - open-drain PG1/PG2 signals indicate valid regulation for system sequencing. |
Pinout & Package
LT8471HFE#PBF is housed in a 20-lead plastic TSSOP package (FE grade) with exposed thermal pad (Pin 21 = GND). All ground pins (10, 11, 12, 21) must be soldered directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1, C2 (1, 20) | Primary switch collectors | Connect to inductor/diode nodes; require minimized trace area for EMI control; C2 ties to Skyhook input when enabled. |
| E1, E2 (2, 19) | Primary switch emitters | Return path for primary channels; tied to ground in low-side configs; toggle in high-side configs. |
| FB1, FB2 (5, 16) | Voltage feedback inputs | Interface with resistor dividers to set +5V or –5V outputs; ±789mV reference enables dual-rail precision. |
| PG1, PG2 (4, 17) | Open-drain power-good outputs | Pull-high externally; go low if output deviates >7.5% from target - used for system power sequencing. |
| OV/UV (6) | Programmable UVLO/OVLO input | Set enable threshold (1.215V typ); tie to resistor divider for custom lockout windows on VIN1/VIN2. |
| RT (7) | Oscillator timing input | Resistor-to-GND sets free-running frequency (fOSC = 85.5/(RT+1) MHz); floating not allowed. |
| SS1, SS2 (8, 15) | Soft-start control inputs | Capacitor-to-GND sets ramp rate; internal 250kΩ pull-up charges to ~2.15V for controlled startup. |
| SYNC (9) | External clock input | Accepts 100kHz–2MHz digital clock; low <0.4V reverts to internal oscillator; duty cycle 35–65% required. |
| SHOUT (14) | Skyhook output | Cathode of integrated Schottky; delivers boosted voltage to VIN1/VIN2 for high-side NPN biasing. |
| VIN1, VIN2 (3, 18) | Channel power supplies | VIN1 powers Channel 1, Skyhook, and core logic; VIN2 powers Channel 2 only - enables independent channel enable/disable. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent topology support | Each 2A channel configurable as buck, boost, SEPIC, ZETA, flyback, or inverting - eliminates need for multiple controllers in multi-rail designs. |
| Anti-phase switching | ~180° phase shift between Channel 1 and Channel 2 clocks - cuts input capacitor RMS current and reduces bulk capacitance requirements. |
| Skyhook integrated boost | On-chip 500mA boost regulator with integrated Schottky diode - eliminates external boost circuitry for high-side NPN drive in buck/ZETA applications. |
| Programmable UVLO/OVLO | Single OV/UV pin accepts resistor divider to set custom undervoltage and overvoltage lockout thresholds - simplifies input rail monitoring. |
| Per-channel soft-start | Independent SS1/SS2 pins with external capacitors - allows staggered startup sequencing and peak current limiting for each output rail. |
Applications
| Industrial Dual-Rail Signal Chain | Automotive Infotainment Power |
|---|---|
Use Scenario: Generating ±5V for precision ADCs, DACs, op-amps, and analog front-ends in PLC I/O modules and test equipment. IC Role / Device Role / Timing Role: Dual-rail DC/DC controller providing isolated, low-noise, sequenced positive and negative supplies from single 24V bus. Use Value: Eliminates need for discrete charge pumps or transformer-based solutions; anti-phase operation reduces input EMI filtering burden. | Use Scenario: Powering display drivers, audio codecs, and sensor interfaces in vehicle head units operating from 6–16V battery supply. IC Role / Device Role / Timing Role: High-temp-rated dual converter delivering stable ±5V rails while surviving cold-crank (6V) and load-dump (32V) transients. Use Value: H-grade 150°C rating ensures reliability under hood; programmable UVLO prevents brownout during engine start. |
| Medical Imaging Sensor Bias | Industrial Motor Control Auxiliary Supply |
Use Scenario: Providing isolated ±5V bias for CCD/CMOS image sensor arrays and low-noise preamp stages in portable ultrasound devices. IC Role / Device Role / Timing Role: Compact dual-output regulator with tight feedback tolerance (±1.5%) enabling accurate sensor biasing and dynamic range preservation. Use Value: Integrated Skyhook eliminates external boost for high-side switch drive in compact form factor - critical for handheld medical devices. | Use Scenario: Generating auxiliary ±5V for gate drivers, isolation logic, and position encoder interfaces in servo drives powered from 48V DC bus. IC Role / Device Role / Timing Role: Robust dual converter supporting wide input (2.6–50V), tolerant of bus ripple and transient overvoltages. Use Value: 50V switch rating and 150°C operation ensure longevity in thermally constrained motor control enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EFE#PBF | Two 5V synchronous buck controllers (no integrated switches); supports higher Vin (60V) but requires external MOSFETs. | Used where efficiency >95% and high current (>10A) needed; lacks Skyhook, inverting, or negative output capability. | Select LTC3892EFE#PBF when designing high-efficiency, high-current buck-only supplies and external FETs are acceptable. |
| LT8705EFE#PBF | Single-channel 80V, 8A synchronous buck-boost controller; no second channel or Skyhook; supports 4-switch topology. | Used for wide-Vin single-output applications (e.g., 8–80V input to 12V output); cannot generate dual-rail or negative voltages natively. | Select LT8705EFE#PBF when needing single high-power buck-boost conversion with ultra-wide input range, not dual-rail generation. |
Compared with LTC3892EFE#PBF and LT8705EFE#PBF, LT8471HFE#PBF uniquely integrates dual 2A switches, Skyhook boost, and native inverting/negative output capability in one TSSOP package - making it optimal for space-constrained dual-rail local power where external FETs or complex magnetics are undesirable.
Availability
LT8471HFE#PBF is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, medical imaging, and test equipment requiring stable component supply with extended temperature performance.
Supply support for LT8471HFE#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 all Linear parts including the LT8471 family.
The LT8471 product line was designed for high-reliability local power conversion in space- and thermal-constrained systems requiring dual independent outputs, flexible topology support, and robust operation across –40°C to +150°C.
FAQ
What is the maximum operating junction temperature for LT8471HFE#PBF?
The LT8471HFE#PBF is rated for continuous operation from –40°C to +150°C junction temperature. This H-grade qualification is verified per Analog Devices' production testing and enables use in under-hood automotive, industrial motor drives, and high-density power modules where ambient temperatures exceed 105°C.
Can LT8471HFE#PBF generate both positive and negative outputs simultaneously?
Yes, LT8471HFE#PBF can generate simultaneous positive and negative outputs - for example, +5V and –5V - from a single 6–32V input rail. Channel 1 is configured as a buck converter for +5V, Channel 2 as an inverting converter for –5V, with independent feedback (FB1/FB2) and power-good (PG1/PG2) monitoring.
How does the Skyhook channel function in LT8471HFE#PBF?
The Skyhook channel in LT8471HFE#PBF is an integrated 500mA boost regulator that delivers a regulated voltage (typically +4.25V above C2) to SHOUT. It supplies base drive for high-side NPN switches in buck or ZETA topologies. When unused, C3 must be tied to GND to disable it and reduce quiescent current.
What are the minimum and maximum switching frequencies supported by LT8471HFE#PBF?
LT8471HFE#PBF supports a free-running or synchronized switching frequency range of 100kHz to 2MHz. The frequency is set by an RT resistor (e.g., 46.4kΩ → 1.8MHz) or an external SYNC signal meeting 35–65% duty cycle and ≥25% of fOSC minimum frequency requirements.
Is LT8471HFE#PBF pin-compatible with other LT8471 variants like LT8471EFE#PBF?
Yes, LT8471HFE#PBF is pin-compatible and footprint-compatible with all LT8471 FE-package variants (E, I, H grades), including LT8471EFE#PBF and LT8471IFE#PBF. Differences are limited to guaranteed temperature range (–40°C to +150°C for H-grade) and minor parametric shifts in feedback voltage drift over temperature.
LT8471HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8471HFE#PBF FAQ
1.How can I place an order for LT8471HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8471HFE#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 LT8471HFE#PBF reliable?
The price and inventory of LT8471HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8471HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8471HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8471HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8471HFE#PBF?
LT8471HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8471HFE#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 LT8471HFE#PBF?
For technical support, including LT8471HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8471HFE#PBF requirements.
6.How does Aetrix verify that LT8471HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8471HFE#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 LT8471HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8471HFE#PBF?
All LT8471HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8471HFE#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 LT8471HFE#PBF part is unused and in its original packaging.
Return procedure for LT8471HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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