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Analog Devices Inc. LTC3862IGN-1#TRPBF
- Part No.:
- LTC3862IGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862IGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
LTC3862IGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, current-mode step-up DC/DC controller driving external N-channel MOSFETs for boost and SEPIC topologies. It operates from 8.5V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and integrates dual 10V gate drivers - enabling high-voltage MOSFET control in telecom power supplies delivering 72V at 2A.
For engineers reviewing the LTC3862IGN-1#TRPBF datasheet, LTC3862IGN-1#TRPBF pinout, LTC3862IGN-1#TRPBF application, or LTC3862IGN-1#TRPBF equivalent, key selection criteria include its 24-pin narrow SSOP package with PGND-exposed pad, ±1% reference accuracy, programmable phase relationship via PHASEMODE, and multi-phase synchronization capability using SYNC/CLKOUT for 2-/3-/4-/6-/12-phase systems.
Technical Context
The LTC3862IGN-1#TRPBF implements peak current mode control with dual independent channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its internal 10V LDO (INTVCC) powers gate drivers, while a cascaded 3.8V LDO (3V8) supplies analog/digital circuitry - both with UVLO protection (7.5V/7.0V thresholds).
Phase-lockable operation is achieved via PLL-based synchronization: the SYNC input accepts 50kHz–650kHz external clocks, and CLKOUT provides daisy-chain timing. PHASEMODE pin selects channel-phase relationships (180°, 120°, or 180°), and DMAX sets precise max duty cycle (75%, 84%, or 96%) using an internal 12× clock derived from fOSC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 36V - supports wide-range industrial and telecom inputs without pre-regulation |
| Max Duty Cycle | Up to 96% - enables high step-up ratios (e.g., 24V → 72V) with minimal dropout loss |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - balances efficiency, size, and EMI in high-power boost designs |
| Gate Drive Voltage | 10V (INTVCC) - ensures robust turn-on of high-voltage N-MOSFETs (e.g., 100V+ RDS(on) devices) |
| Reference Accuracy | ±1% over temperature - guarantees tight output voltage regulation in precision power supplies |
| Current Sense Threshold | 65mV typical (CH1/CH2 matched within ±10mV) - enables accurate, low-loss current sensing with 0.02Ω shunts |
| Operating Temp Range | –40°C to +125°C (I-grade) - qualified for automotive under-hood and industrial ambient conditions |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.209" width, 0.025" lead pitch, exposed thermal pad (Pin 25) connected to PGND and required to be soldered to PCB ground for thermal performance (θJA = 85°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Max Duty Cycle Control | SGND = 96%, float = 84%, 3V8 = 75% - sets hard limit on on-time to prevent transformer saturation or diode overstress |
| PHASEMODE (Pin 4) | Multi-Phase Timing Selector | SGND/float/3V8 configures CH1–CH2 phase offset (180°/180°/120°) and CH1–CLKOUT alignment (90°/60°/240°) |
| GATE1 / GATE2 (Pins 16, 18) | N-Channel MOSFET Drivers | 10V, 3Ω pull-up / 0.9Ω pull-down - drives high-QG MOSFETs with fast edge rates and low shoot-through risk |
| SENSE1+/SENSE2+ (Pins 23, 13) | Current Sense Inputs | Differential inputs referenced to SENSE– pins - reject common-mode noise in high-dI/dt switching nodes |
| SYNC (Pin 11) | PLL Clock Input | Accepts 50–650kHz external clock; rising edge aligns with GATE1 - enables synchronized multi-controller systems |
| CLKOUT (Pin 10) | Phase-Referenced Output | Provides timing signal for daisy-chaining additional LTC3862-1 ICs - eliminates inter-channel jitter in multi-phase stacks |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70% vs single-phase - cuts bulk capacitance and ESR requirements |
| Programmable leading-edge blanking | 210ns (BLANK=SGND) to 375ns (BLANK=3V8) - suppresses gate-drive-induced current-sense spikes during MOSFET turn-on |
| Adjustable slope compensation gain | Normalized gain = 0.625 (SGND), 1.0 (float), or 1.66 (3V8) - stabilizes current loop across wide duty-cycle and inductor ranges |
| Internal 10V/3.8V dual LDOs | Eliminates need for external bias rails - INTVCC powers gate drivers; 3V8 powers error amp, PLL, and logic - simplifies BOM and layout |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - prevents erratic startup/shutdown near supply brownout conditions |
Applications
| Telecom 48V-to-72V Boost Supply | Industrial 24V-to-48V SEPIC Converter |
|---|---|
Use Scenario: Telecom remote radio units requiring regulated 72V from fluctuating 36–60V backplane input. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs, synchronizing to system clock via SYNC, and regulating output with ±1% FB reference. Use Value: Interleaving cuts input capacitor count by 50%; 96% duty cycle maintains regulation down to 36V input; 10V gate drive ensures full enhancement of 100V MOSFETs. |
Use Scenario: Industrial PLC I/O modules needing isolated 48V rail from noisy 24V factory bus with no input-output ground continuity. IC Role / Device Role / Timing Role: SEPIC controller implementing non-inverting topology with current-mode stability, soft-start ramping via SS pin, and thermal derating per θJA=85°C/W. Use Value: Dual-channel operation reduces output ripple below 20mVpp; programmable DMAX prevents core saturation during line transients; 3.8V LDO powers isolated feedback optocoupler circuitry. |
| Automotive ADAS Camera Power | Test Equipment High-Voltage Bias Supply |
Use Scenario: Automotive surround-view camera ECU generating 12V/1A and 72V/100mA from 8.5–16V battery with cold-crank immunity. IC Role / Device Role / Timing Role: Dual-output boost controller (using CH1 for 12V, CH2 for 72V) with independent current sensing and phase-shifted operation to minimize conducted EMI. Use Value: –40°C to +125°C I-grade rating ensures operation during engine-off soak; 75kHz min frequency avoids AM band; BLANK pin setting suppresses cranking-induced noise. |
Use Scenario: Automated test equipment requiring stable, low-noise 100V bias for photomultiplier tubes, with programmable slew rate and overvoltage lockout. IC Role / Device Role / Timing Role: Precision boost controller with VFB(OV) = +10% lockout, soft-start via SS capacitor, and 1.223V reference trimmed to ±1% for <0.5% output drift. Use Value: Adjustable slope compensation maintains stability with high-L, low-IOUT inductors; 10V gate drive enables use of low-RDS(on) SiC FETs for <500ns turn-off; SYNC input allows synchronized sweep triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH-1#TRPBF | Same die, 5mm × 5mm QFN-24 package (θJA = 44°C/W), –40°C to +85°C grade | Better thermal performance in space-constrained layouts; lower profile than SSOP; not rated for 125°C ambient | Select when board area and thermal resistance are critical, and ambient temperature stays ≤85°C. |
| LTC3862IFE-1#TRPBF | Same functionality, 24-lead TSSOP-24 package (θJA = 38°C/W), –40°C to +125°C grade | Higher thermal efficiency than GN24; same pinout as LTC3862IGN-1#TRPBF but wider body (0.300") | Select when higher power density and superior thermal margin are needed without changing footprint compatibility. |
Compared with LTC3862IGN-1#TRPBF, the QFN variant offers 2× better thermal resistance but sacrifices high-temp rating, while the TSSOP variant retains the I-grade rating with improved θJA - making it ideal for thermally demanding 125°C industrial deployments where SSOP's 85°C/W would require excessive copper pour.
Availability
LTC3862IGN-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial SEPIC converters, automotive ADAS camera modules, and test equipment bias supplies requiring stable component supply, long-term lifecycle support, and guaranteed I-grade temperature qualification.
Supply support for LTC3862IGN-1#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, documentation, and manufacturing continuity for the LTC portfolio. Linear pioneered high-performance power management ICs with emphasis on precision, efficiency, and ruggedness.
The LTC3862-1 family was designed specifically for high-reliability, multi-phase boost and SEPIC applications in telecom infrastructure, industrial automation, and automotive systems - emphasizing thermal robustness, synchronization fidelity, and wide-input operation.
FAQ
What is the maximum achievable output voltage using LTC3862IGN-1#TRPBF in a boost configuration?
The LTC3862IGN-1#TRPBF itself does not impose a hard upper limit on output voltage - it is a controller only. Practical output voltage is determined by external components: MOSFET VDS rating, diode PIV, and output capacitor voltage rating. In published typical applications, LTC3862IGN-1#TRPBF achieves 72V at 2A from 24V input using 100V MOSFETs and 100V output capacitors. For higher outputs, select appropriately rated FETs and passive components while respecting the 96% max duty cycle constraint.
Does LTC3862IGN-1#TRPBF support true current sharing between phases in multi-phase configurations?
No, LTC3862IGN-1#TRPBF does not implement active current balancing or droop control. It supports interleaved timing (via PHASEMODE and CLKOUT) and synchronized switching, but each channel regulates independently using its own SENSE+/- pair. Current matching relies on component tolerance (±10mV sense threshold matching) and careful layout. For precise current sharing, external current-balancing circuits or master-slave configurations with dedicated current-loop controllers are required.
Can LTC3862IGN-1#TRPBF be used in SEPIC topology, and what design considerations apply?
Yes, LTC3862IGN-1#TRPBF is explicitly qualified for SEPIC operation per its datasheet. Key considerations include: using coupled inductors or two separate inductors with matched DCR; connecting the SEPIC capacitor between SW1/SW2 and output; configuring feedback to sense output (not switch node); and ensuring DMAX is set conservatively (≤84%) to avoid capacitor overvoltage during transient load steps. The controller's dual-channel architecture naturally accommodates SEPIC's two-switch structure.
What is the purpose of the 3V8 pin on LTC3862IGN-1#TRPBF, and can it power external circuitry?
The 3V8 pin on LTC3862IGN-1#TRPBF 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 (error amplifier, PLL, logic). It is not intended to source current to external loads - the datasheet specifies no output current rating and warns against using it for external biasing. A 1nF ceramic capacitor must be placed between 3V8 and SGND; connecting external loads risks reference instability and thermal overload of the LDO.
How does the BLANK pin affect minimum on-time, and what is its impact on light-load efficiency?
The BLANK pin on LTC3862IGN-1#TRPBF sets the duration of leading-edge blanking applied to the current sense comparator - 210ns (BLANK=SGND), 290ns (float), or 375ns (BLANK=3V8). Longer blanking improves noise immunity but increases minimum controllable on-time, limiting low-duty-cycle operation and potentially reducing light-load efficiency due to forced discontinuous conduction mode. For high-step-up ratios at light loads, BLANK=SGND optimizes minimum on-time without compromising stability.
LTC3862IGN-1#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3862IGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IGN-1#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-1#TRPBF reliable?
The price and inventory of LTC3862IGN-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862IGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IGN-1#TRPBF?
LTC3862IGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IGN-1#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-1#TRPBF?
For technical support, including LTC3862IGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3862IGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IGN-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862IGN-1#TRPBF?
All LTC3862IGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IGN-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862IGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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