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Analog Devices Inc. LTC3862HGN#TRPBF
- Part No.:
- LTC3862HGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862HGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
LTC3862HGN#TRPBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost/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 features internal 5V/3.8V LDOs for gate drive and analog circuitry. It is used in high-efficiency automotive telecom power supplies delivering 48V at 5A.
For engineers reviewing the LTC3862HGN#TRPBF datasheet, LTC3862HGN#TRPBF pinout, LTC3862HGN#TRPBF application, or LTC3862HGN#TRPBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), programmable slope compensation, leading-edge blanking control, multi-phase scalability (2-/3-/4-/6-/12-phase), and AEC-Q100 qualification for under-hood operation.
Technical Context
The LTC3862HGN#TRPBF implements fixed-frequency peak current mode control with dual independent channels operating 180° out of phase. Its error amplifier drives the ITH pin to set per-cycle peak current threshold, while internal slope compensation (adjustable via SLOPE pin) stabilizes loop response across duty cycles. The device integrates a PLL-based synchronization engine accepting 50kHz–650kHz external clocks on SYNC and generating phase-aligned CLKOUT.
Two cascaded PMOS LDOs supply critical subsystems: INTVCC (5V, 50mA max) powers gate drivers and PGND-referenced circuitry, while 3V8 (3.8V) powers SGND-referenced analog/digital blocks. Phase relationship between CH1, CH2, and CLKOUT is programmable via PHASEMODE pin (0V/float/3.8V), enabling precise timing alignment in multi-phase stacks.
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% - achieved when DMAX tied to SGND; enables high step-up ratios (e.g., 12V→48V). |
| Current Sense Threshold | 65mV typical - low-loss sensing with ±10mV channel-to-channel matching ensures balanced phase current sharing. |
| Reference Voltage | ±1% accuracy at 1.223V - ensures stable output voltage regulation across temperature and load. |
| Operating Temp | –40°C to +150°C - H-grade qualification enables placement near heat sources in engine compartments. |
| Package | 24-lead narrow SSOP (GN) - thermally enhanced for high-power density layouts with accessible leads. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.025" 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 | Tying to SGND sets 96% limit; float = 84%; 3V8 = 75% - enables precise overvoltage protection and inductor saturation margining. |
| SLOPE (Pin 2) | Slope compensation gain control | Float = 1.0× gain; SGND = 0.625×; 3V8 = 1.66× - prevents subharmonic oscillation in continuous conduction mode. |
| BLANK (Pin 3) | Leading edge blanking time control | SGND = 180ns; float = 260ns; 3V8 = 340ns - suppresses gate-drive-induced noise during MOSFET turn-on. |
| PHASEMODE (Pin 4) | Phase relationship selector | 0V = 180° CH1–CH2 / 90° CH1–CLKOUT; float = same; 3V8 = 120° CH1–CH2 / 240° CH1–CLKOUT - enables flexible multi-phase interleaving. |
| FREQ (Pin 5) | Oscillator frequency setting | Resistor to SGND sets fSW; 45.6kΩ yields 300kHz - allows deterministic EMI shaping and filter component sizing. |
| SS (Pin 6) | Soft-start timing control | Capacitor to SGND sets ramp rate of ITH voltage - prevents inrush current and output overshoot during startup. |
| ITH (Pin 7) | Error amplifier output | Drives current comparator threshold; also used for loop compensation - direct access to control loop dynamics. |
| FB (Pin 8) | Feedback input | Resistive divider from VOUT sets regulated output voltage; referenced to 1.223V internal reference. |
| SGND (Pin 9) | Signal ground reference | Return for FB, SS, 3V8 bypass - must be kelvin-connected to output capacitor negative terminal for tight load regulation. |
| CLKOUT (Pin 10) | Phase-synchronized clock output | Drives SYNC of downstream LTC3862s - enables deterministic interleaving without external timing ICs. |
| SYNC (Pin 11) | External clock input | Accepts 50–650kHz square wave; rising edge aligns with GATE1 - enables system-level EMI reduction and clock tree coherence. |
| PLLFLTR (Pin 12) | PLL loop filter node | RC network to SGND sets PLL bandwidth and jitter rejection - critical for stable synchronization under noisy conditions. |
| SENSE2+ (Pin 13) | Channel 2 current sense positive | Connects to top of sense resistor in CH2 source path - enables independent current monitoring per phase. |
| SENSE2– (Pin 14) | Channel 2 current sense negative | Connects to bottom of CH2 sense resistor - differential input rejects common-mode noise. |
| PGND (Pin 15) | Power ground return | Return for INTVCC bypass, MOSFET sources, and GATE drivers - must be low-inductance connection to minimize switching noise. |
| GATE2 (Pin 16) | Channel 2 gate driver output | 5V logic-level drive referenced to PGND - directly drives N-channel MOSFET gates without level shifters. |
| GATE1 (Pin 18) | Channel 1 gate driver output | 5V logic-level drive referenced to PGND - identical timing and drive strength to GATE2 for matched phase behavior. |
| INTVCC (Pin 19) | 5V gate driver LDO output | Bypass with ≥4.7µF ceramic to PGND - powers gate drivers and high-current circuits; UVLO protects against weak gate drive. |
| VIN (Pin 20) | Main input supply | 4V–36V input; bypass to SGND with low-ESR ceramic - feeds both INTVCC LDO and internal bias circuitry. |
| RUN (Pin 21) | Enable/disable control | 1.22V threshold with 80mV hysteresis - enables sequenced power-up and fault shutdown with minimal external components. |
| SENSE1– (Pin 22) | Channel 1 current sense negative | Connects to bottom of CH1 sense resistor - completes differential current sensing path for primary channel. |
| SENSE1+ (Pin 23) | Channel 1 current sense positive | Connects to top of CH1 sense resistor - provides high-side current sensing for accurate peak current control. |
| 3V8 (Pin 24) | 3.8V analog/digital LDO output | Bypass with 1nF ceramic to SGND - powers error amplifier, comparators, and logic; isolated from PGND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by up to 70%, allowing smaller bulk capacitors and lower ESR requirements. |
| Programmable phase relationships | Supports 2-, 3-, 4-, 6-, or 12-phase configurations via SYNC/CLKOUT/PHASEMODE - enables scalable power delivery without redesign. |
| Adjustable slope compensation | Three gain options (0.625×/1.0×/1.66×) via SLOPE pin - ensures stable current mode control across full duty cycle range. |
| AEC-Q100 qualified (H-grade) | Rated for –40°C to +150°C junction temperature - validated for automotive under-hood applications including ADAS and infotainment. |
| Dual cascaded LDO architecture | Separate 5V (INTVCC) and 3.8V (3V8) supplies isolate high-current gate drive from sensitive analog circuitry - improves PSRR and noise immunity. |
Applications
| Automotive Engine Control Unit (ECU) Power | Telecom Remote Radio Head (RRH) Supply |
|---|---|
Use Scenario: Generating stable 48V rail from 12V vehicle battery for high-power RF amplifiers and sensors in engine bay. IC Role / Device Role / Timing Role: Two-phase boost controller managing synchronous N-MOSFET switching with phase interleaving to reduce thermal stress and EMI. Use Value: AEC-Q100 H-grade rating ensures reliable operation at 150°C ambient; 96% max duty cycle enables efficient 12V→48V conversion without transformer. | Use Scenario: Providing regulated 48V output from –48V telecom battery for remote radio units mounted on cell towers. IC Role / Device Role / Timing Role: SEPIC controller operating in wide VIN range (4V–36V) to accommodate battery degradation and line transients. Use Value: Internal 5V/3.8V LDOs eliminate need for external bias rails; SYNC/CLKOUT enables synchronization with base station clock to suppress conducted EMI. |
| Industrial Motor Drive Auxiliary Supply | Medical Imaging System High-Voltage Bias |
Use Scenario: Generating isolated auxiliary 24V/5A supply from main DC bus for gate drivers and control logic in servo inverters. IC Role / Device Role / Timing Role: Dual-channel boost controller driving parallel MOSFETs per phase to handle high peak currents during motor startup. Use Value: Programmable leading-edge blanking (180–340ns) rejects noise from IGBT/MOSFET switching; DMAX pin enables safe current limiting during stall conditions. | Use Scenario: Producing precisely regulated 48V bias for photomultiplier tubes and detector arrays in portable ultrasound and X-ray equipment. IC Role / Device Role / Timing Role: Precision current-mode controller with ±1% reference and 65mV sense threshold ensuring <±0.5% output regulation. Use Value: Soft-start (SS pin) prevents arcing during cold start; thermal shutdown protects sensitive imaging components from overtemperature events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IGN#TRPBF | Same silicon, I-grade (-40°C to +125°C) instead of H-grade (-40°C to +150°C); identical pinout and electrical specs. | Not qualified for under-hood automotive use; suitable for industrial enclosures with active cooling. | Select when junction temperature remains ≤125°C and AEC-Q100 is not required. |
| LTC3862HUH#TRPBF | Same silicon, QFN package (5mm × 5mm) with exposed PGND pad; θJA = 44°C/W vs. 85°C/W for SSOP. | Superior thermal performance enables higher power density; requires different PCB layout and reflow profile. | Select when board space is constrained and thermal management prioritized over leaded package serviceability. |
Compared with LTC3862IGN#TRPBF, the LTC3862HGN#TRPBF offers extended high-temperature operation essential for engine compartment deployment, while LTC3862HUH#TRPBF provides 49% lower thermal resistance but demands QFN-specific assembly processes - choice depends on thermal budget and manufacturing capability.
Availability
LTC3862HGN#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, telecom RRH supplies, and industrial motor drive auxiliary rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3862HGN#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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC3862 product line delivers high-efficiency, multi-phase boost/SEPIC controllers optimized for automotive, telecom, and industrial power systems demanding wide input range, precise regulation, and robust thermal performance.
FAQ
What is the maximum allowable junction temperature for the LTC3862HGN#TRPBF?
The LTC3862HGN#TRPBF is rated for a maximum junction temperature of +150°C, consistent with its AEC-Q100 H-grade qualification. This specification enables reliable operation in under-hood automotive environments where ambient temperatures exceed 105°C. Thermal design must ensure TJ does not exceed this limit under worst-case load, input voltage, and ambient conditions using the provided θJA = 85°C/W value for the GN24 package. Derating is recommended above 125°C to maintain long-term reliability.
How does the PHASEMODE pin affect timing relationships in multi-phase configurations using the LTC3862HGN#TRPBF?
The PHASEMODE pin on the LTC3862HGN#TRPBF directly controls the phase offset between Channel 1 and Channel 2 gate signals, as well as between Channel 1 and the CLKOUT signal. When tied to 0V, it configures 180° CH1–CH2 and 90° CH1–CLKOUT; floating or tying to 3V8 changes these to 180°/60° and 120°/240° respectively. This programmability allows precise interleaving for 2-, 3-, 4-, 6-, or 12-phase systems without external timing ICs, reducing EMI and improving current sharing in stacked LTC3862HGN#TRPBF designs.
Can the LTC3862HGN#TRPBF be used in SEPIC topology, and what design considerations apply?
Yes, the LTC3862HGN#TRPBF supports SEPIC topology in addition to boost, as confirmed by its functional diagram and typical application circuits. Key considerations include using coupled inductors or separate L1/L2 windings with proper polarity, configuring feedback to regulate VOUT rather than intermediate node voltage, and ensuring the SENSE pins monitor switch-node current accurately. The device's wide 4V–36V input range and 96% max duty cycle make it suitable for SEPIC implementations requiring high step-up or step-down capability from a single input source.
What is the purpose of the 3V8 pin on the LTC3862HGN#TRPBF, and how should it be decoupled?
The 3V8 pin on the LTC3862HGN#TRPBF is the output of an internal 3.8V LDO powered from INTVCC, supplying low-noise bias to analog and digital control circuitry including the error amplifier, comparators, and logic blocks. It must be decoupled with a 1nF X5R or better ceramic capacitor placed as close as possible to the pin and returned to SGND. This capacitor minimizes high-frequency noise coupling into sensitive analog nodes and ensures stable loop response. The 3V8 rail is not intended to power external circuitry.
How does the DMAX pin function on the LTC3862HGN#TRPBF, and what is its impact on converter safety?
The DMAX pin on the LTC3862HGN#TRPBF programs the maximum duty cycle limit: tying to SGND sets 96%, floating sets 84%, and tying to 3V8 sets 75%. This limit is derived from an internal 12× oscillator clock, ensuring precise and temperature-stable enforcement. It serves as a critical safety mechanism preventing inductor saturation, MOSFET overstress, and output overvoltage during transient conditions or feedback loop failure - especially vital in automotive applications where fault containment is mandatory.
LTC3862HGN#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):
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3862HGN#TRPBF FAQ
1.How can I place an order for LTC3862HGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862HGN#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 LTC3862HGN#TRPBF reliable?
The price and inventory of LTC3862HGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862HGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862HGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862HGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862HGN#TRPBF?
LTC3862HGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862HGN#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 LTC3862HGN#TRPBF?
For technical support, including LTC3862HGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862HGN#TRPBF requirements.
6.How does Aetrix verify that LTC3862HGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862HGN#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 LTC3862HGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862HGN#TRPBF?
All LTC3862HGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862HGN#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 LTC3862HGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862HGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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