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Analog Devices Inc. LTC3862EFE#PBF
- Part No.:
- LTC3862EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3862EFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:345
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Product details
Overview
LTC3862EFE#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% max 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 industrial boost power supplies delivering stable 48V outputs.
For engineers reviewing the LTC3862EFE#PBF datasheet, LTC3862EFE#PBF pinout, LTC3862EFE#PBF application, or LTC3862EFE#PBF equivalent, key selection considerations include phase synchronization capability (SYNC/CLKOUT/PHASEMODE), programmable leading edge blanking (BLANK pin), slope compensation gain control (SLOPE pin), and multi-temperature-grade availability (–40°C to 85°C E-grade).
Technical Context
The LTC3862EFE#PBF implements a fixed-frequency, two-phase peak current mode architecture with 180° interleaved channel operation to reduce input/output ripple and filter component stress. Its dual-channel design uses independent current sense paths (SENSE1±, SENSE2±) with ±10mV matching and supports external slope compensation via the SLOPE pin for stability across wide duty cycles.
It features an internal PLL for synchronization to external clocks (50kHz–650kHz), programmable phase relationships (via PHASEMODE pin), and precise maximum duty cycle control (DMAX pin: 75%/84%/96%). The cascaded LDO architecture-INTVCC (5V, 50mA) feeding 3V8 (3.8V)-powers gate drivers and analog/digital circuitry separately, enabling robust operation under transient load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by single resistor on FREQ pin; enables optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin; allows high step-up ratios (e.g., 12V→48V) with minimal dropout loss. |
| Gate Drive Voltage | 5V (INTVCC-referenced) - directly drives logic-level N-MOSFETs without level-shifting, reducing BOM count. |
| Reference Accuracy | ±1% (1.223V) - ensures tight output voltage regulation across temperature and line variations. |
| Current Sense Threshold | 60mV to 90mV (adjustable via ITH) - provides precise peak current limiting with <±10mV channel-to-channel matching. |
| Operating Temp | –40°C to +85°C - E-grade qualification suitable for commercial and extended-temperature industrial applications. |
Pinout & Package
The LTC3862EFE#PBF is housed in a 24-lead narrow-body TSSOP (FE package) with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical performance. Thermal resistance θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | SGND = 96%, float = 84%, 3V8 = 75% - enables precise overvoltage protection and loop stability tuning. |
| GATE1/GATE2 (Pins 18/16) | N-MOSFET gate drive outputs | 5V CMOS outputs referenced to PGND - drive logic-level MOSFETs directly; rated –0.3V to 6V absolute max. |
| SENSE1+/SENSE2+ (Pins 23/13) | Positive current sense inputs | Differential inputs to peak current comparators - connect to top of sense resistors; support accurate per-phase current limiting. |
| PHASEMODE (Pin 4) | Interleaving phase configuration | SGND = 180°, float = 180°, 3V8 = 120° - sets CH1–CH2 and CH1–CLKOUT phase alignment for 2-/3-/4-/6-/12-phase scaling. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50kHz–650kHz TTL/CMOS clock - aligns GATE1 rising edge to SYNC rising edge for EMI reduction and multi-controller coherence. |
| CLKOUT (Pin 10) | Phase-locked clock output | Drives downstream LTC3862 devices in daisy-chain configurations - eliminates need for external clock distribution networks. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~30% and cuts peak-to-peak ripple amplitude by ~50% versus single-phase designs. |
| Programmable slope compensation | SLOPE pin adjusts gain (0.625× to 1.66× nominal) - prevents subharmonic oscillation in continuous conduction mode at >50% duty cycle. |
| Internal 5V/3.8V dual-LDO system | INTVCC powers gate drivers; 3V8 powers analog/digital circuits - eliminates need for external bias rails and improves noise immunity. |
| Precision RUN pin threshold | 1.22V enable threshold with 80mV hysteresis - enables clean, glitch-free startup and shutdown sequencing in multi-rail systems. |
| Adjustable minimum on-time | 180ns (BLANK=SGND) to 340ns (BLANK=3V8) - supports high-frequency operation while maintaining controllability at light loads. |
Applications
| Automotive 12V→48V Mild Hybrid Systems | Industrial Telecom Power Supplies |
|---|---|
Use Scenario: Boosting vehicle battery voltage (9V–16V) to regulated 48V rail for active suspension, brake-by-wire, or LED lighting subsystems. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs with synchronized gate drive and current balancing. Use Value: Interleaving reduces input capacitor stress and EMI emissions, meeting CISPR-25 Class 5 requirements without added shielding. | Use Scenario: Generating isolated 48V intermediate bus from 24V or 36V industrial DC source for PoE++ switches or base station RF amplifiers. IC Role / Device Role / Timing Role: High-efficiency, multi-phase step-up controller with programmable frequency and sync capability for system-level clock alignment. Use Value: 96% peak efficiency at 5A output and 75kHz–500kHz tunability allow optimal magnetics selection for space-constrained telecom modules. |
| Medical Imaging Power Modules | Test Equipment High-Voltage Bias Supplies |
Use Scenario: Providing low-noise, tightly regulated 48V supply for CCD/CMOS sensor biasing and analog front-end circuitry in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision-controlled boost controller with ±1% reference and soft-start (SS pin) for controlled ramp-up of sensitive imaging rails. Use Value: Internal 3.8V LDO isolates analog control circuitry from noisy power stages, improving SNR in signal chain components. | Use Scenario: Generating stable 40–60V bias voltage from 12V/24V bench supply for semiconductor parameter analyzers or laser diode drivers. IC Role / Device Role / Timing Role: Adjustable max duty cycle (DMAX pin) and leading edge blanking (BLANK pin) enable reliable operation at extreme step-up ratios. Use Value: 90mV current sense threshold and ±10mV channel matching ensure accurate current limiting during fast transient events in test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IFE#PBF | Same functionality, rated for –40°C to +125°C junction temperature; higher thermal specification. | Suitable for under-hood automotive or high-ambient industrial environments where extended temperature range is required. | Select when operating ambient exceeds 85°C or when AEC-Q100 compliance is mandatory. |
| LTC3862-1EFE#PBF | Higher INTVCC UVLO (7.5V rising), optimized for standard-threshold MOSFETs instead of logic-level devices. | Used where 10V gate drive is needed for high-voltage (>100V) boost stages or legacy MOSFETs with higher VGS(th). | Choose only if driving non-logic-level MOSFETs; not drop-in compatible due to different UVLO and gate drive characteristics. |
Compared with LTC3862IFE#PBF, the LTC3862EFE#PBF offers lower cost and sufficient thermal margin for commercial/industrial enclosures, while LTC3862-1EFE#PBF addresses fundamentally different MOSFET drive requirements - neither serves as a pin-compatible replacement without circuit revalidation.
Availability
LTC3862EFE#PBF is available at Aetrix Electronics and suitable for automotive 12V→48V conversion, industrial telecom power supplies, and medical imaging power modules requiring stable component supply and long-term production continuity.
Supply support for LTC3862EFE#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 precision instrumentation, industrial automation, and automotive markets.
The LTC3862 product line delivers high-efficiency, multi-phase boost and SEPIC controllers targeting demanding power conversion applications where reliability, thermal performance, and EMI control are critical - especially in automotive mild hybrid and industrial 48V systems.
FAQ
What is the maximum achievable output voltage using LTC3862EFE#PBF in a boost configuration?
The LTC3862EFE#PBF itself does not impose a hard upper limit on output voltage; it is constrained by external component ratings and layout. In practice, designs achieving 48V output (e.g., from 12V input) are validated and documented. The 96% max duty cycle and 36V VIN rating support high step-up ratios, but MOSFET voltage rating, diode reverse voltage, and output capacitor WV must be selected accordingly. The LTC3862EFE#PBF remains stable and functional as long as loop compensation and current sensing are correctly implemented for the target VOUT/VIN ratio.
Does LTC3862EFE#PBF support synchronization to an external clock, and what is the valid frequency range?
Yes, the LTC3862EFE#PBF supports external clock synchronization via its SYNC pin. It accepts TTL/CMOS-compatible signals from 50kHz to 650kHz, with rising-edge alignment to GATE1. The internal PLL locks to the external clock, enabling coherent multi-phase operation across multiple LTC3862EFE#PBF units or integration into system-wide timing architectures. This capability is confirmed in the Electrical Characteristics table and Functional Diagram of the official datasheet.
How is the switching frequency set on LTC3862EFE#PBF, and what tolerance can be expected?
The switching frequency of LTC3862EFE#PBF is set by a single resistor (RFREQ) connected from the FREQ pin to SGND. With RFREQ = 45.6kΩ, typical fOSC = 300kHz (±10kHz). The full range spans 75kHz to 500kHz. Frequency variation over temperature is ±0.5% (–40°C to 85°C), and line regulation is ±0.02%/V - verified in Typical Performance Characteristics Figures G26 and G27. No calibration is required.
Can LTC3862EFE#PBF drive standard-threshold MOSFETs, or is it limited to logic-level devices?
The LTC3862EFE#PBF is optimized for logic-level N-channel MOSFETs, providing 5V gate drive referenced to PGND. Its INTVCC LDO is rated 5V ±2%, making it unsuitable for driving standard-threshold MOSFETs requiring ≥10V VGS. For such applications, Analog Devices specifies the LTC3862-1 variant (10V INTVCC, 7.5V UVLO), which is functionally distinct. Using LTC3862EFE#PBF with standard MOSFETs risks insufficient turn-on and increased conduction losses.
What thermal package options are available for LTC3862EFE#PBF, and how do they differ?
LTC3862EFE#PBF is exclusively offered in the 24-lead narrow-body TSSOP (FE package) with exposed PGND pad. It is not available in SSOP (GN) or QFN (UH) variants under the EFE#PBF suffix. The FE package has θJA = 38°C/W and requires soldering of the exposed pad to PCB ground for rated thermal performance. Other variants (e.g., LTC3862EGN#PBF, LTC3862EUH#PBF) carry different part numbers and temperature grades.
LTC3862EFE#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LTC3862EFE#PBF FAQ
1.How can I place an order for LTC3862EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EFE#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 LTC3862EFE#PBF reliable?
The price and inventory of LTC3862EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EFE#PBF?
LTC3862EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EFE#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 LTC3862EFE#PBF?
For technical support, including LTC3862EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EFE#PBF requirements.
6.How does Aetrix verify that LTC3862EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EFE#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 LTC3862EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862EFE#PBF?
All LTC3862EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EFE#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 LTC3862EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3862EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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