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Analog Devices Inc. LTC3862IGN-2#TRPBF
- Part No.:
- LTC3862IGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862IGN-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
LTC3862IGN-2#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 5.5V to 36V input, delivers up to 96% duty cycle, supports 75kHz–500kHz programmable switching frequency, and features internal 10V and 3.8V LDOs for gate drive and analog circuitry - used in high-voltage telecom power supplies delivering 80V at 7A.
For engineers reviewing the LTC3862IGN-2#TRPBF datasheet, LTC3862IGN-2#TRPBF pinout, LTC3862IGN-2#TRPBF application, or LTC3862IGN-2#TRPBF equivalent, key selection criteria include its dual-phase current-mode architecture, INTVCC UVLO thresholds (4.4V rising / 3.9V falling), PHASEMODE-programmable multi-phase synchronization (2-/3-/4-/6-/12-phase), and 24-pin SSOP package with –40°C to 125°C industrial temperature grade.
Technical Context
The LTC3862IGN-2#TRPBF implements fixed-frequency, peak current mode control with two independent channels operating 180° out-of-phase. Its error amplifier compares FB voltage against a ±1% 1.223V reference and drives ITH to modulate peak inductor current. Slope compensation gain is adjustable via SLOPE pin (0.625× to 1.66× nominal), and leading edge blanking is configurable via BLANK pin (210ns–375ns minimum on-time).
Phase synchronization uses an internal PLL with SYNC input (50kHz–650kHz range) and CLKOUT output; PHASEMODE pin selects channel-to-channel (120°/180°) and channel-to-CLKOUT (60°/90°/240°) phase relationships. The device integrates cascaded PMOS LDOs: a 10V INTVCC regulator (50mA max, 4.4V UVLO+) powering gate drivers, and a 3.8V 3V8 regulator (bypassed with 1nF) powering analog/digital circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost/SEPIC controller - reduces input/output ripple current and capacitor sizing by interleaving phases. |
| Input Voltage Range | 5.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 32V rails. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable); 50kHz–650kHz when synchronized - enables EMI optimization and magnetics size reduction. |
| Max Duty Cycle | 96% (DMAX = SGND), 84% (DMAX = float), 75% (DMAX = 3V8) - supports high step-up ratios (e.g., 12V → 80V) without saturation. |
| INTVCC UVLO Threshold | 4.4V (rising), 3.9V (falling) - ensures reliable gate drive turn-on for 6V-VGS rated MOSFETs before startup. |
| Reference Voltage | 1.223V ±1% - sets output voltage accuracy via FB resistive divider; line/load regulation <±0.01%/V and <0.1% respectively. |
| Operating Temp | –40°C to +125°C (I-grade) - qualified for industrial environments with thermal derating above 125°C junction. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.025" lead pitch, exposed pad connected to PGND. Thermal resistance θJA = 85°C/W. Requires soldering of exposed pad to PCB for thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Maximum duty cycle programming | SGND = 96%, float = 84%, 3V8 = 75% - precise limit derived from 12× internal clock for stable high-duty operation. |
| PHASEMODE (Pin 4) | Multi-phase phase relationship control | Selects CH1–CH2 (120°/180°) and CH1–CLKOUT (60°/90°/240°) - enables 2-/3-/4-/6-/12-phase daisy-chaining. |
| FREQ (Pin 5) | Oscillator frequency setting | Resistor to SGND sets 75–500kHz - determines switching loss, magnetics size, and EMI profile. |
| SS (Pin 6) | Soft-start timing control | Capacitor to SGND sets ramp rate of ITH - prevents inrush current during startup. |
| ITH (Pin 7) | Error amplifier output | Drives current comparator threshold - directly controls peak inductor current and loop stability. |
| FB (Pin 8) | Voltage feedback input | Connects to resistive divider from VOUT - regulates output using 1.223V reference with ±1% accuracy. |
| SGND (Pin 9) | Signal ground reference | Kelvin connection point for FB, SS, and sense resistors - critical for load regulation and noise immunity. |
| CLKOUT (Pin 10) | Multi-phase synchronization output | Drives SYNC of downstream LTC3862-2 - enables deterministic phase alignment across multiple controllers. |
| SYNC (Pin 11) | External clock synchronization input | Accepts 50–650kHz TTL/CMOS clock - locks switching frequency to system master clock for EMI reduction. |
| PLLFLTR (Pin 12) | PLL loop filter node | RC network to SGND stabilizes PLL lock - ensures jitter-free synchronization under varying load/transient conditions. |
| SENSE2+ (Pin 13) | Channel 2 current sense positive | Connects to top of current-sense resistor - sets trip threshold for second phase's peak current limiting. |
| SENSE2– (Pin 14) | Channel 2 current sense negative | Connects to bottom of current-sense resistor - completes differential sensing path for channel 2. |
| PGND (Pin 15, Exposed Pad) | Power ground return | Must be soldered to PCB ground plane - carries high di/dt currents from MOSFET sources and INTVCC bypass. |
| GATE2 (Pin 16) | Channel 2 high-side gate driver | 10V, 3Ω pull-up / 0.9Ω pull-down - drives N-MOSFET gates with fast rise/fall times and robust shoot-through immunity. |
| GATE1 (Pin 18) | Channel 1 high-side gate driver | Identical to GATE2 - enables matched dual-phase drive with independent MOSFET control. |
| INTVCC (Pin 19) | 10V gate driver LDO output | Bypass with ≥4.7µF X5R ceramic to PGND - powers gate drivers; UVLO protects MOSFETs below 4.4V. |
| VIN (Pin 20) | Main supply input | 5.5–36V input rail - powers INTVCC LDO and internal bias circuits; requires local ceramic bypass to SGND. |
| RUN (Pin 21) | Enable/disable control | 1.22V threshold with 80mV hysteresis - provides clean startup/shutdown sequencing and brown-out protection. |
| SENSE1– (Pin 22) | Channel 1 current sense negative | Completes differential sensing for channel 1 - matches SENSE2– within ±7mV over temperature. |
| SENSE1+ (Pin 23) | Channel 1 current sense positive | Primary current sensing input - trip threshold adjustable from 65mV to 85mV via ITH voltage. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Bypass with 1nF ceramic to SGND - powers internal op-amps, comparators, and logic; not for external loads. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output RMS current ripple by ~70%, enabling smaller bulk capacitors and lower ESR requirements. |
| Programmable slope compensation | SLOPE pin adjusts gain from 0.625× to 1.66× - stabilizes current mode control across wide duty cycle and inductance variations. |
| Adjustable minimum on-time | BLANK pin configures 210ns (SGND), 290ns (float), or 375ns (3V8) - supports high-frequency, high-input designs without pulse skipping. |
| Multi-phase synchronization capability | SYNC/CLKOUT/PHASEMODE enable deterministic 2-/3-/4-/6-/12-phase systems - eliminates beat frequencies and improves transient response. |
| Integrated dual-LDO power system | 10V INTVCC (50mA) + 3.8V 3V8 (low-noise) - eliminates need for external bias supplies while isolating power domains. |
| Precision reference and error amplifier | ±1% 1.223V reference with 660µ℧ transconductance and 1.8MHz unity-gain bandwidth - enables tight regulation and fast load step recovery. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias |
|---|---|
Use Scenario: Generating 80V/7A output from 24V input in 48V telecom rectifier systems. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved MOSFET switching with 180° phase offset and synchronized CLKOUT for parallel module stacking. Use Value: Reduces 120Hz output ripple by >90% versus single-phase, cuts bulk capacitor count by 50%, and maintains >95% efficiency at full load. | Use Scenario: Providing stable 72V bias for RF power amplifiers in base station transceivers. IC Role / Device Role / Timing Role: SEPIC controller operating at 300kHz with programmable DMAX (96%) and slope compensation to handle wide input transients (6–32V). Use Value: Enables single-stage conversion without transformer isolation; maintains regulation during 20ms brownouts via robust UVLO hysteresis and soft-start control. |
| Automotive ADAS Camera Power | Test Equipment HV Source |
Use Scenario: Converting 12V vehicle battery to 48V for high-resolution automotive camera modules. IC Role / Device Role / Timing Role: Dual-phase boost controller with RUN pin sequencing and thermal shutdown, operating across –40°C to +125°C ambient. Use Value: Meets AEC-Q100 stress requirements; achieves <100mVpp output noise via interleaved filtering and low-noise 3V8 LDO. | Use Scenario: Programmable 30–100V output source in automated test equipment requiring fast transient response. IC Role / Device Role / Timing Role: Digitally synchronized boost controller using external SYNC clock to align switching with measurement sampling windows. Use Value: Eliminates switching-induced measurement artifacts; supports 50–650kHz sync range for flexible test timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-2#TRPBF | Same die, 5mm × 5mm QFN package (θJA = 44°C/W), –40°C to 85°C grade | Better thermal performance but lower max ambient temperature - suitable for space-constrained, convection-cooled designs | Select when board layout allows QFN soldering and ambient stays ≤85°C; avoid if extended temperature qualification required. |
| LTC3862IFE-2#TRPBF | Same die, 24-lead TSSOP package (θJA = 38°C/W), –40°C to 125°C grade | Lower thermal resistance than SSOP but same temp grade - preferred for high-power density industrial applications | Choose when higher thermal margin is needed without changing footprint; compatible with existing FE24 layout. |
Compared with LTC3862IGN-2#TRPBF, the QFN variant offers superior thermal dissipation but lacks extended temperature rating, while the TSSOP version matches the industrial temperature range with improved θJA, making it preferable for thermally demanding deployments where package height permits.
Availability
LTC3862IGN-2#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial high-voltage bias generators, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3862IGN-2#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 design tools for the LTC portfolio.
The LTC3862 family is designed for high-efficiency, multi-phase boost and SEPIC DC/DC conversion in telecom, industrial, and automotive applications requiring wide input range, precise voltage regulation, and robust thermal performance.
FAQ
What is the maximum duty cycle supported by the LTC3862IGN-2#TRPBF, and how is it configured?
The LTC3862IGN-2#TRPBF supports a maximum duty cycle of 96%, 84%, or 75%, selected by connecting the DMAX pin (Pin 1) to SGND, leaving it floating, or tying it to 3V8 respectively. This limit is derived from an internal 12× clock for precision, enabling stable high-step-up operation (e.g., 12V → 80V) without subharmonic oscillation. The LTC3862IGN-2#TRPBF datasheet specifies these values under all operating conditions.
How does the PHASEMODE pin affect multi-phase operation in the LTC3862IGN-2#TRPBF?
The PHASEMODE pin (Pin 4) configures the phase relationship between Channel 1 and Channel 2 (120° or 180°), and between Channel 1 and CLKOUT (60°, 90°, or 240°). This enables deterministic 2-, 3-, 4-, 6-, or 12-phase interleaving when cascading multiple LTC3862IGN-2#TRPBF controllers. The LTC3862IGN-2#TRPBF uses this pin to eliminate beat frequencies and improve dynamic response in stacked power modules.
What are the UVLO thresholds for the INTVCC LDO in the LTC3862IGN-2#TRPBF, and why are they important?
The INTVCC UVLO thresholds for the LTC3862IGN-2#TRPBF are 4.4V (rising) and 3.9V (falling), providing 500mV hysteresis. These thresholds ensure the 10V gate driver supply is fully established before enabling MOSFET switching, preventing weak turn-on of 6V-VGS rated power devices. This protects against shoot-through and thermal runaway during input brownouts - a critical safeguard confirmed in the LTC3862IGN-2#TRPBF electrical characteristics table.
Can the LTC3862IGN-2#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3862IGN-2#TRPBF accepts external synchronization via the SYNC pin (Pin 11) over 50kHz to 650kHz. The internal PLL locks to the rising edge of the SYNC signal, aligning GATE1 timing precisely. This feature enables EMI reduction in dense systems and deterministic timing in test equipment - verified in the LTC3862IGN-2#TRPBF typical performance curves and absolute maximum ratings.
What is the purpose of the 3V8 pin on the LTC3862IGN-2#TRPBF, and how should it be decoupled?
Pin 24 (3V8) is the output of an internal 3.8V LDO that powers low-voltage analog and digital circuitry, including the error amplifier and comparators. It must be decoupled with a 1nF X5R ceramic capacitor placed as close as possible to the pin and SGND - per the LTC3862IGN-2#TRPBF pin function description. This LDO is not intended for external loads and is electrically isolated from INTVCC and PGND.
LTC3862IGN-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 5.5V ~ 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-2#TRPBF FAQ
1.How can I place an order for LTC3862IGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IGN-2#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 LTC3862IGN-2#TRPBF reliable?
The price and inventory of LTC3862IGN-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IGN-2#TRPBF?
LTC3862IGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IGN-2#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 LTC3862IGN-2#TRPBF?
For technical support, including LTC3862IGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862IGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IGN-2#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 LTC3862IGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IGN-2#TRPBF?
All LTC3862IGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IGN-2#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 LTC3862IGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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