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Analog Devices Inc. LTC3862IFE#PBF
- Part No.:
- LTC3862IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862IFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,568
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Product details
Overview
LTC3862IFE#PBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost and SEPIC DC/DC controller driving N-channel MOSFETs. It operates from 4V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 5V gate drivers with internal 5V/3.8V LDOs. It is used in high-efficiency automotive and telecom power supplies delivering regulated 48V outputs.
For engineers reviewing the LTC3862IFE#PBF datasheet, LTC3862IFE#PBF pinout, LTC3862IFE#PBF application, or LTC3862IFE#PBF equivalent, key selection criteria include multi-phase synchronization capability (2-/3-/4-/6-/12-phase via SYNC/CLKOUT/PHASEMODE), ±1% reference accuracy, programmable leading-edge blanking, adjustable slope compensation, and AEC-Q100 qualification for under-hood automotive use.
Technical Context
The LTC3862IFE#PBF implements fixed-frequency peak current mode control across two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its error amplifier drives the ITH pin to set per-cycle peak current thresholds, while internal slope compensation (adjustable via SLOPE pin) stabilizes operation at duty cycles >50%.
Phase synchronization uses an internal PLL with external clock input (50kHz–650kHz) on SYNC, generating aligned CLKOUT for daisy-chained controllers. The DMAX pin sets maximum duty cycle (75%/84%/96%) via voltage level, and PHASEMODE configures inter-channel phase relationships (120°/180°) and CLKOUT alignment (60°/90°/240°).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-range industrial and automotive battery inputs including 12V/24V systems. |
| Switching Frequency | 75kHz to 500kHz - set by single external resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - achieved when DMAX = SGND; allows high step-up ratios (e.g., 12V → 48V) with minimal dropout loss. |
| Reference Accuracy | ±1% over temperature - ensures stable output regulation across –40°C to 125°C junction range. |
| Gate Drive Voltage | 5V (INTVCC) - optimized for logic-level N-channel MOSFETs; reduces conduction losses vs. standard-threshold devices. |
| Current Sense Threshold | 60mV to 90mV (typical) - matched between CH1/CH2 within ±10mV; enables precise current balancing in multi-phase designs. |
| Thermal Rating | –40°C to +125°C (I-grade) - qualified per AEC-Q100 Grade 1; suitable for under-dash automotive power modules. |
Pinout & Package
Package: 24-lead thermally enhanced TSSOP (FE24), 0.65mm lead pitch, exposed PGND pad soldered to PCB for thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | Power MOSFET gate driver outputs | 5V CMOS outputs referenced to PGND; drive logic-level N-MOSFETs directly without level-shifting. |
| SENSE1+/SENSE1– / SENSE2+/SENSE2– | Differential current sense inputs | Measure MOSFET source current via external shunt; enable per-phase current limiting and matching. |
| FB | Error amplifier inverting input | Connects to resistive divider from VOUT; sets regulated output voltage with ±1% reference (1.223V). |
| ITH | Error amplifier output | Controls peak current threshold; also serves as loop compensation node for Type II/III networks. |
| DMAX | Maximum duty cycle programming | SGND = 96%, float = 84%, 3V8 = 75%; derived from 12× internal clock for precise timing control. |
| PHASEMODE | Inter-channel phase configuration | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase offset and 90°/60°/240° CH1–CLKOUT alignment. |
| SYNC / CLKOUT | PLL synchronization interface | SYNC accepts 50–650kHz external clock; CLKOUT provides phase-aligned digital output for multi-phase stacking. |
| RUN | Enable/disable control | 1.22V threshold with 80mV hysteresis; internal 0.5µA pull-up + 4.5µA hysteresis current enables clean startup/shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% and cuts EMI peak amplitude vs. single-phase implementation. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625×/1.0×/1.66× nominal) to maintain stability across full duty cycle and load range. |
| Internal cascaded LDOs | 5V INTVCC powers gate drivers; 3.8V 3V8 powers analog/digital circuitry - eliminates need for external bias rails. |
| Adjustable minimum on-time | BLANK pin selects 180ns (SGND), 260ns (float), or 340ns (3V8) - enables reliable operation at high VIN/VOUT ratios. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood applications (–40°C to +125°C); includes HTOL, TC, ESD, and AC/DC stress testing. |
Applications
| Automotive Infotainment Power Supply | Telecom Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Generating stable 48V from 12V vehicle battery for LCD backlighting and audio amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved inductor currents and synchronized gate drive timing. Use Value: Reduces input capacitance by 50% and lowers EMI emissions to meet CISPR 25 Class 5 limits without added shielding. |
Use Scenario: Providing isolated 48V bias for GaN power amplifiers in 5G small-cell base stations. IC Role / Device Role / Timing Role: High-efficiency SEPIC controller delivering regulated output despite wide input variation (24V–36V). Use Value: Achieves >94% efficiency at 5A load with 125°C-rated operation, enabling compact fanless RRU enclosures. |
| Industrial Programmable Logic Controller (PLC) I/O Module | Medical Imaging Sensor Bias Supply |
Use Scenario: Stepping up 24V field bus to 48V for analog output drivers and isolation barrier supplies. IC Role / Device Role / Timing Role: Dual-channel boost controller with independent current sensing per channel for fault-tolerant redundancy. Use Value: Enables hot-swap capability and graceful degradation during single-channel failure without system reset. |
Use Scenario: Generating low-noise 48V bias for avalanche photodiode (APD) arrays in portable ultrasound probes. IC Role / Device Role / Timing Role: Low-ripple, tightly regulated boost converter with precision reference and soft-start control. Use Value: Maintains <±0.5% output regulation over temperature and load, ensuring consistent APD gain calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862HFE#PBF | Higher temperature grade (–40°C to +150°C); identical electrical specs and pinout. | Required for engine compartment applications exceeding 125°C ambient or high-power density designs. | Select when junction temperature exceeds 125°C under worst-case thermal conditions; otherwise LTC3862IFE#PBF suffices. |
| LTC3862IUH#PBF | Same I-grade rating but in 5mm × 5mm QFN package (θJA = 44°C/W vs. 38°C/W); exposes PGND pad for superior thermal transfer. | Better suited for space-constrained layouts where TSSOP footprint is prohibitive or board-level thermal management is critical. | Choose for higher power density or improved thermal performance; requires rework of layout and thermal vias. |
Compared with LTC3862HFE#PBF, the LTC3862IFE#PBF offers identical functionality at lower cost and sufficient thermal margin for most under-dash automotive modules; versus LTC3862IUH#PBF, it trades slightly higher θJA for mature TSSOP assembly compatibility and lower BOM risk.
Availability
LTC3862IFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, telecom remote radio units, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3862IFE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3862 series is part of Analog Devices' Power by Linear portfolio, designed specifically for high-efficiency, multi-phase DC/DC conversion in demanding automotive and telecom environments where reliability, thermal robustness, and EMI control are critical.
FAQ
What is the operating temperature range of the LTC3862IFE#PBF?
The LTC3862IFE#PBF is rated for operation from –40°C to +125°C junction temperature and is AEC-Q100 Grade 1 qualified. This makes it suitable for automotive under-hood applications and industrial environments where ambient temperatures exceed 85°C. The device includes integrated overtemperature protection that disables switching if TJ exceeds 150°C.
How does the PHASEMODE pin affect multi-phase synchronization in the LTC3862IFE#PBF?
The PHASEMODE pin on the LTC3862IFE#PBF selects the phase relationship between Channel 1 and Channel 2 (120°/180°) and between Channel 1 and CLKOUT (60°/90°/240°). When grounded, it configures 180° interleaving and 90° CLKOUT offset - ideal for standard two-phase boost. Floating or tying to 3V8 enables 3-, 4-, 6-, or 12-phase stacking using multiple LTC3862IFE#PBF units.
Can the LTC3862IFE#PBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862IFE#PBF supports SEPIC operation using its two-phase current-mode architecture. Designers must configure both channels with coupled inductors or separate windings, ensure proper transformer coupling ratio, and verify slope compensation settings for stability across the full duty cycle range. The datasheet provides specific SEPIC reference designs and component selection guidelines for LTC3862IFE#PBF.
What is the purpose of the BLANK pin on the LTC3862IFE#PBF, and how does it impact minimum on-time?
The BLANK pin on the LTC3862IFE#PBF sets the minimum MOSFET on-time to prevent false current-sense triggering during gate-drive rise/fall transitions. Connecting BLANK to SGND yields 180ns, floating gives 260ns, and tying to 3V8 extends it to 340ns. This adjustment is critical for high VIN/VOUT ratios where short on-times dominate the switching cycle and require precise blanking control.
Does the LTC3862IFE#PBF require external components for the internal LDOs, and what are their requirements?
Yes, the LTC3862IFE#PBF requires external bypass capacitors for both internal LDOs: a minimum 4.7µF X5R/X7R ceramic capacitor between INTVCC and PGND, and a 1nF ceramic capacitor between 3V8 and SGND. These must be placed as close as possible to their respective pins. Larger INTVCC capacitance (≥10µF) is recommended when driving high-QG MOSFETs or paralleled devices to maintain gate drive stability.
LTC3862IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 75kHz ~ 500kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862IFE#PBF FAQ
1.How can I place an order for LTC3862IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IFE#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 LTC3862IFE#PBF reliable?
The price and inventory of LTC3862IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IFE#PBF?
LTC3862IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IFE#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 LTC3862IFE#PBF?
For technical support, including LTC3862IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IFE#PBF requirements.
6.How does Aetrix verify that LTC3862IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IFE#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 LTC3862IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IFE#PBF?
All LTC3862IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IFE#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 LTC3862IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3862IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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