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Analog Devices Inc. LTC3862IGN-1#PBF
- Part No.:
- LTC3862IGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862IGN-1#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
LTC3862IGN-1#PBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost and SEPIC DC/DC controller driving N-channel MOSFETs for high-voltage step-up conversion. It operates from 8.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers - enabling efficient 72V output generation in telecom power supplies.
For engineers reviewing the LTC3862IGN-1#PBF datasheet, LTC3862IGN-1#PBF pinout, LTC3862IGN-1#PBF application, or LTC3862IGN-1#PBF equivalent, key selection considerations include its 24-lead narrow SSOP package with –40°C to 125°C operating range, phase-synchronization capability via SYNC/CLKOUT/PHASEMODE, and precise ±1% internal voltage reference for stable output regulation.
Technical Context
The LTC3862IGN-1#PBF implements fixed-frequency, peak current mode control with two interleaved channels operating 180° out of phase to reduce input/output ripple. Its error amplifier compares FB voltage against a 1.223V reference and drives ITH to modulate peak inductor current, while slope compensation (adjustable via SLOPE pin) prevents subharmonic oscillation in continuous conduction mode.
It features cascaded LDOs: a 10V INTVCC regulator powers gate drivers (with 7.5V UVLO threshold), and a 3.8V 3V8 LDO supplies analog/digital circuitry. Phase synchronization uses an internal PLL with programmable PHASEMODE pin logic (0V/float/3.8V) to configure 2-/3-/4-/6-/12-phase operation across multiple ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost and SEPIC controller - enables interleaved operation to halve input/output capacitor requirements vs single-phase designs. |
| Input Voltage Range | 8.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V bus systems. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - allows optimization of magnetics size vs efficiency; supports external sync from 50kHz to 650kHz. |
| Max Duty Cycle | Up to 96% (via DMAX pin grounded) - enables high step-up ratios (e.g., 12V→72V) without requiring excessive turns ratio or low-VF diodes. |
| Gate Drive | 10V output referenced to PGND - sufficient to fully enhance high-voltage N-channel MOSFETs (e.g., 100V+ RDS(on)) with low conduction loss. |
| Reference Accuracy | ±1% over temperature - ensures tight output voltage regulation (e.g., 72V ±0.72V) without external trimming. |
| Operating Temp | –40°C to +125°C (I-grade) - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.25-inch lead pitch, exposed pad not present (unlike QFN/TSSOP variants). Thermal resistance θJA = 85°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | Ground → 96%; float → 84%; connect to 3V8 → 75% - sets hard limit on on-time to prevent transformer saturation or overvoltage stress. |
| PHASEMODE (Pin 4) | Interleaving phase configuration | 0V → 180° CH1–CH2; float → 180° CH1–CH2 + 60° CH1–CLKOUT; 3V8 → 120° CH1–CH2 + 240° CH1–CLKOUT - enables scalable multi-phase expansion. |
| GATE1 / GATE2 (Pins 16, 18) | N-channel MOSFET gate drivers | 10V push-pull outputs with 3Ω pull-up / 0.9Ω pull-down - capable of driving >50nC gate charge at 300kHz with minimal dead-time distortion. |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current sense positive inputs | Differential inputs to current comparators - used with low-side sense resistors (e.g., 20mΩ) to set per-phase peak current limit. |
| FB (Pin 8) | Error amplifier inverting input | Connects to resistor divider from VOUT - sets regulated output voltage as VOUT = 1.223V × (1 + R1/R2); ±1% reference ensures <±12mV error at 72V. |
| INTVCC (Pin 19) | 10V gate driver LDO output | Bypass with ≥4.7µF X5R ceramic to PGND - supplies gate drive current; UVLO at 7.5V prevents weak turn-on of high-voltage MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved architecture | Reduces input RMS current by ~30% and cuts output voltage ripple amplitude by ~50%, allowing smaller bulk capacitors in 72V telecom systems. |
| Programmable slope compensation | SLOPE pin (Pin 2) adjusts gain: float = 1.0×, SGND = 0.625×, 3V8 = 1.66× - stabilizes current loop across varying duty cycles and inductance tolerances. |
| Leading edge blanking adjustment | BLANK pin (Pin 3) selects minimum on-time: SGND = 210ns, float = 290ns, 3V8 = 375ns - suppresses gate-drive-induced noise during MOSFET turn-on. |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - prevents erratic startup/shutdown near brown-out conditions in 24V industrial rails. |
| Multi-phase synchronization interface | SYNC input accepts 50–650kHz external clock; CLKOUT provides phase-aligned output; PHASEMODE configures inter-IC timing - supports up to 12-phase systems without external timing ICs. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias |
|---|---|
|
Use Scenario: Generating isolated 72V DC for legacy telecom line cards from 24V or 32V backplane supply. IC Role / Device Role / Timing Role: Two-phase boost controller managing synchronous rectification and interleaved switching to minimize EMI and thermal stress. Use Value: Achieves >94% efficiency at 2A load (VIN=24V→VOUT=72V) while reducing input capacitor size by 40% versus single-phase alternatives. |
Use Scenario: Providing stable 60–80V bias for industrial plasma generators or HV op-amps from 12–36V DC input. IC Role / Device Role / Timing Role: SEPIC-mode controller delivering non-inverting high-voltage output with inherent input-output isolation and wide VIN tolerance. Use Value: Supports 96% max duty cycle and programmable DMAX to maintain regulation even during deep input dips (e.g., 8.5V min). |
| Automotive ADAS Camera Power | Test Equipment HV Source |
|
Use Scenario: Powering 65V image sensors in automotive surround-view cameras from 12V battery rail with cold-crank immunity. IC Role / Device Role / Timing Role: Boost controller with precision RUN pin hysteresis and –40°C to +125°C operation ensuring reliable startup during engine cranking. Use Value: Maintains regulation down to 8.5V input and delivers <10mV output ripple (20MHz BW) critical for low-noise imaging. |
Use Scenario: Programmable HV source in automated test equipment requiring precise 50–100V outputs with fast transient response. IC Role / Device Role / Timing Role: Current-mode controller with soft-start (SS pin) and leading-edge blanking enabling repeatable, glitch-free voltage ramp-up. Use Value: Adjustable slope compensation and ±1% reference support <0.1% output accuracy across temperature and line variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-1#PBF | Same die, 5mm × 5mm QFN package (θJA = 34°C/W), rated for –40°C to +85°C only. | Better thermal performance but narrower temperature range - suitable for space-constrained telecom modules with active cooling. | Select when board area is limited and ambient temperature stays below 85°C; avoid for under-hood or unventilated enclosures. |
| LTC3862IFE-1#PBF | Same functionality, 24-lead TSSOP package (θJA = 38°C/W), –40°C to +125°C rating, exposed thermal pad. | Lower thermal resistance than GN package and same temp grade - preferred for higher-power or thermally demanding layouts. | Choose for new designs needing improved thermal margin without QFN rework; compatible footprint with GN but better heatsinking. |
Compared with LTC3862IGN-1#PBF, the QFN variant offers superior thermal performance but sacrifices extended temperature capability, while the TSSOP variant matches the I-grade spec with enhanced thermal dissipation - making it the optimal drop-in upgrade for thermally constrained LTC3862IGN-1#PBF deployments.
Availability
LTC3862IGN-1#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias generation, and automotive ADAS camera systems requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3862IGN-1#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 power management ICs.
The LTC3862 family was designed specifically for high-efficiency, high-step-up DC/DC conversion in telecom, industrial, and automotive applications where reliability, thermal robustness, and multi-phase scalability are critical.
FAQ
What is the maximum output voltage achievable with the LTC3862IGN-1#PBF?
The LTC3862IGN-1#PBF itself does not impose a hard upper limit on output voltage - it is a controller, not a regulator. Output voltage is set by the external resistor divider on the FB pin and constrained by external components (MOSFETs, diodes, inductors, capacitors). In published typical applications, LTC3862IGN-1#PBF achieves stable 72V output from 24V input with >94% efficiency. Designers must select appropriately rated external components to support higher voltages.
Does the LTC3862IGN-1#PBF support SEPIC topology, and what modifications are required?
Yes, the LTC3862IGN-1#PBF supports SEPIC operation using the same pinout and control architecture as boost mode. No internal modification is needed. The key design change is replacing the boost diode with a coupling capacitor and adjusting the inductor configuration per the SEPIC schematic in the datasheet. Current sensing remains identical, and slope compensation settings apply directly.
How does the PHASEMODE pin affect synchronization when daisy-chaining multiple LTC3862IGN-1#PBF controllers?
The PHASEMODE pin on each LTC3862IGN-1#PBF determines the phase offset between its CH1 gate signal and the CLKOUT output, as well as between CH1 and CH2. When daisy-chaining, one LTC3862IGN-1#PBF acts as master (PHASEMODE = float), and slaves use PHASEMODE = 0V or 3.8V to achieve 180° or 120° offsets respectively - enabling precise 2-, 3-, 4-, 6-, or 12-phase interleaving without external timing ICs.
What is the purpose of the 3V8 pin on the LTC3862IGN-1#PBF, and can it power external circuitry?
The 3V8 pin on the LTC3862IGN-1#PBF is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply for the IC's internal analog and digital circuitry. It is not intended to drive external loads - the datasheet explicitly states it should be bypassed with only a 1nF ceramic capacitor to SGND and must not be used as a general-purpose supply rail due to limited current capability and lack of external load regulation.
Can the LTC3862IGN-1#PBF operate with input voltage below 8.5V, and what happens if VIN drops below specification?
No - the LTC3862IGN-1#PBF has a specified minimum input voltage of 8.5V. If VIN falls below this level, the internal 10V INTVCC LDO cannot regulate, causing gate drive voltage to collapse and resulting in uncontrolled MOSFET switching or complete shutdown. The device includes no brown-out recovery circuitry below 8.5V, so system-level undervoltage protection must be implemented externally to prevent malfunction during input sags.
LTC3862IGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- 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):
- 8.5V ~ 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-SSOP
LTC3862IGN-1#PBF FAQ
1.How can I place an order for LTC3862IGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IGN-1#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 LTC3862IGN-1#PBF reliable?
The price and inventory of LTC3862IGN-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IGN-1#PBF?
LTC3862IGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IGN-1#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 LTC3862IGN-1#PBF?
For technical support, including LTC3862IGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IGN-1#PBF requirements.
6.How does Aetrix verify that LTC3862IGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IGN-1#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 LTC3862IGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IGN-1#PBF?
All LTC3862IGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IGN-1#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 LTC3862IGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3862IGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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