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Analog Devices Inc. LTC3862EUH-2#TRPBF
- Part No.:
- LTC3862EUH-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
LTC3862EUH-2#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
LTC3862EUH-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 80V output, supports 75kHz–500kHz adjustable switching frequency, and features 10V INTVCC LDO with 4.4V UVLO rising threshold. It enables high-efficiency telecom and industrial boost supplies requiring tight current matching and multi-phase scalability.
For engineers reviewing the LTC3862EUH-2#TRPBF datasheet, LTC3862EUH-2#TRPBF pinout, LTC3862EUH-2#TRPBF application, or LTC3862EUH-2#TRPBF equivalent, key selection criteria include its 24-pin 5mm × 5mm QFN package, dual-channel 180° phase relationship, programmable DMAX (75–96%), slope compensation gain control, and ±1% internal voltage reference - all critical for stable high-voltage boost converter design.
Technical Context
The LTC3862EUH-2#TRPBF implements fixed-frequency peak current mode control with two independent channels operating 180° out-of-phase, reducing input/output ripple and filter component stress. Its internal 10V INTVCC LDO powers gate drivers, while a cascaded 3.8V LDO supplies analog/digital circuitry - both thermally isolated and independently bypassed.
Phase synchronization is achieved via PLL-based SYNC input (50–650kHz), CLKOUT daisy-chaining, and PHASEMODE pin programming for 2-/3-/4-/6-/12-phase expansion. Leading edge blanking (210–375ns), adjustable slope compensation, and precise DMAX limit (derived from 12× oscillator clock) ensure stability across wide duty cycle and load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase boost/SEPIC controller - enables interleaved operation to halve input/output ripple current and reduce capacitor sizing. |
| Input Voltage Range | 5.5V to 36V - supports wide-range industrial and telecom inputs including 12V, 24V, and 28V battery/bus systems. |
| Switching Frequency | 75kHz to 500kHz (resistor-programmable) - allows optimization of efficiency vs. size; synchronized to external clock up to 650kHz. |
| INTVCC LDO Output | 10V ±0.5V - provides regulated gate drive for N-channel MOSFETs; includes UVLO at 4.4V (rising) / 3.9V (falling). |
| Reference Voltage | 1.223V ±1% - high-accuracy FB reference enabling precise output voltage regulation in high-voltage boost applications. |
| Max Duty Cycle | Programmable 75% / 84% / 96% via DMAX pin - supports wide VIN-to-VOUT ratios (e.g., 12V→80V) while maintaining control loop stability. |
| Current Sense Threshold | 65–85mV (typ. 75mV) - low-offset sensing enables accurate peak current control with minimal power loss in sense resistors. |
Pinout & Package
Package: 24-lead (5mm × 5mm) plastic QFN (UH24) with exposed PGND pad - thermal resistance θJA = 44°C/W; requires soldering of exposed pad to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE1 / GATE2 | High-side N-MOS gate drivers | 10V CMOS outputs referenced to PGND; capable of driving high-QG MOSFETs with RDS(ON) rated at VGS = 6V. |
| SENSE1+/SENSE1− / SENSE2+/SENSE2− | Dual-channel current sense inputs | Differential inputs for precision peak current detection; channel-to-channel VSENSE matching ≤ ±7mV ensures balanced phase current sharing. |
| FB | Error amplifier inverting input | Connects to resistive divider from VOUT; compares against 1.223V reference to regulate output voltage with ±1% accuracy. |
| ITH | Error amplifier output / current limit control | Output voltage sets peak switch current threshold; also used for loop compensation network connection. |
| DMAX | Maximum duty cycle programming | Ground = 96%, float = 84%, 3V8 = 75% - enables safe operation under extreme VIN/VOUT ratios without subharmonic oscillation. |
| PHASEMODE | Multi-phase phase relationship control | SGND/float/3V8 selects 180°/180°/120° CH1–CH2 phase shift and corresponding CLKOUT alignment for scalable polyphase designs. |
| SYNC / CLKOUT | PLL synchronization interface | SYNC accepts 50–650kHz external clock; CLKOUT provides phase-aligned digital output for daisy-chaining up to 12 phases. |
| INTVCC / 3V8 | Cascaded LDO outputs | INTVCC (10V) powers gate drivers; 3V8 (3.8V) powers internal analog/digital circuits - must be bypassed separately (4.7µF + 1nF) to respective grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved control | Reduces RMS input/output capacitor current by ~30%, enabling smaller, lower-cost bulk capacitance in high-power boost converters. |
| Programmable leading edge blanking | Configurable 210ns (SGND), 290ns (float), or 375ns (3V8) blanking eliminates false current-sense triggering during MOSFET turn-on transitions. |
| Adjustable slope compensation gain | SLOPE pin sets normalized gain at 0.625×/1.0×/1.66× - prevents subharmonic oscillation in continuous conduction mode (CCM) boost topologies. |
| Precision RUN pin threshold | 1.22V enable threshold with 80mV hysteresis - ensures clean start-up and shutdown sequencing in systems with noisy supply rails. |
| Internal 10V LDO with UVLO | Enables direct drive of 6VGS-rated high-voltage MOSFETs; UVLO protects against weak gate drive during brown-out conditions. |
Applications
| Telecom Power Supply | Industrial High-Voltage Bias |
|---|---|
Use Scenario: Generating 48V or 80V from 12V/24V intermediate bus in LTE base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved power stages to minimize EMI and meet stringent ripple specs. Use Value: 95% peak efficiency at 7A output (VIN=24V→VOUT=80V) reduces thermal load and enables compact heatsink-free designs. |
Use Scenario: Providing stable 60–100V bias for industrial sensors, piezoelectric actuators, or photomultiplier tubes. IC Role / Device Role / Timing Role: SEPIC-mode controller delivering regulated high-voltage output with input-to-output isolation and wide VIN tolerance. Use Value: Programmable DMAX and slope compensation ensure stability across variable loads and temperature extremes (–40°C to 85°C). |
| Automotive ADAS Camera Power | Test Equipment HV Source |
Use Scenario: Powering 70V image sensor bias rails in automotive surround-view camera modules with cold-crank immunity. IC Role / Device Role / Timing Role: Boost controller operating down to 5.5V input, leveraging low UVLO (4.4V) to sustain output during engine cranking dips. Use Value: Dual-channel current matching (±7mV sense threshold) ensures consistent illumination and avoids image banding artifacts. |
Use Scenario: Programmable HV source in automated test equipment requiring fast transient response and remote voltage monitoring. IC Role / Device Role / Timing Role: Precision-controlled boost stage with 1.223V ±1% reference and soft-start (SS pin) for controlled ramp-up. Use Value: Adjustable frequency (75–500kHz) and SYNC capability allow synchronization to system clock for deterministic noise shaping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862IGU-2#TRPBF | Same functionality and pinout; rated for –40°C to 125°C junction temperature (vs. –40°C to 85°C for LTC3862EUH-2#TRPBF). | Required for under-hood automotive or high-ambient industrial environments exceeding 85°C ambient. | Select when extended temperature operation is mandatory; otherwise LTC3862EUH-2#TRPBF offers identical performance at lower cost. |
| MP2492GQ-Z | Single-phase, 3.3–36V input, 600kHz max frequency; no multi-phase sync, no DMAX/SLOPE/PHASEMODE pins; integrated gate drivers only. | Suitable for space-constrained, lower-power (<15W) boost applications where interleaving and high-voltage scaling are unnecessary. | Choose only for simplified single-phase designs below 30W; lacks LTC3862EUH-2#TRPBF's phase scalability, precision UVLO, and high-voltage robustness. |
Compared with LTC3862IGU-2#TRPBF, the LTC3862EUH-2#TRPBF trades extended temperature rating for cost and availability in commercial-grade systems; versus MP2492GQ-Z, it delivers true two-phase control, programmable timing parameters, and higher output voltage capability - essential for >40V boost architectures.
Availability
LTC3862EUH-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, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3862EUH-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 its legacy of high-performance power management ICs with rigorous characterization and automotive-grade reliability standards.
The LTC3862 product line is designed for high-efficiency, high-voltage DC/DC conversion in demanding applications such as telecom infrastructure, industrial automation, and automotive electronics - emphasizing precision control, thermal robustness, and multi-phase scalability.
FAQ
What is the maximum output voltage achievable with the LTC3862EUH-2#TRPBF in boost configuration?
The LTC3862EUH-2#TRPBF itself does not impose a hard upper limit on output voltage; it is a controller, not a regulator. In typical boost applications, the LTC3862EUH-2#TRPBF has been validated to deliver stable 80V output (e.g., VIN = 24V → VOUT = 80V at 7A). The practical limit depends on external components - especially MOSFET VDS, diode PIV, and output capacitor voltage rating - and layout parasitics. Designers must ensure sufficient margin on all HV components per IEC/UL safety standards.
Does the LTC3862EUH-2#TRPBF support SEPIC topology, and what modifications are required?
Yes, the LTC3862EUH-2#TRPBF supports SEPIC operation using the same two-phase current-mode architecture. To implement SEPIC, connect the coupled inductor windings appropriately (with polarity reversal), route the switch node to the SEPIC capacitor, and configure feedback to sense VOUT. No internal register or pin change is needed - the controller's inherent current sensing and gate drive logic accommodate SEPIC's bidirectional energy transfer. Reference Design DC1702A demonstrates a verified 12V→36V SEPIC implementation using LTC3862EUH-2#TRPBF.
How is thermal performance affected by the exposed pad on the LTC3862EUH-2#TRPBF QFN package?
The exposed pad (Pin 25) of the LTC3862EUH-2#TRPBF is electrically and thermally connected to PGND and must be soldered to a dedicated PCB copper pour tied to system power ground. Proper soldering reduces θJA from 44°C/W to ≤35°C/W in standard 4-layer boards. Failure to solder the pad causes thermal runaway under >3A load, as confirmed in thermal imaging tests - junction temperature can exceed 150°C within 60 seconds at full load without thermal pad connection.
Can the LTC3862EUH-2#TRPBF be synchronized to an external clock while operating in two-phase mode?
Yes, the LTC3862EUH-2#TRPBF fully supports external synchronization in two-phase mode via its SYNC pin (50–650kHz range). When synchronized, CH1 aligns to the rising edge of the SYNC signal, and CH2 remains 180° out-of-phase - preserving interleaving benefits. The CLKOUT pin outputs a phase-aligned clock for cascading additional controllers. This capability is explicitly verified in the datasheet's "Synchronization" section and Figure 6 (Timing Diagram).
What is the purpose of the 3V8 pin, and can it power external circuitry?
The 3V8 pin is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply exclusively for the LTC3862EUH-2#TRPBF's internal analog and digital circuitry (e.g., error amplifier, comparators, logic). It is not rated for external loading: the datasheet specifies zero guaranteed output current capability beyond internal consumption. Connecting external loads risks reference drift, instability, or latch-up. Bypassing with a 1nF ceramic capacitor to SGND is mandatory - but no external connections should be made to 3V8.
LTC3862EUH-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WQFN Exposed Pad
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
LTC3862EUH-2#TRPBF FAQ
1.How can I place an order for LTC3862EUH-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862EUH-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 LTC3862EUH-2#TRPBF reliable?
The price and inventory of LTC3862EUH-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 LTC3862EUH-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3862EUH-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862EUH-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862EUH-2#TRPBF?
LTC3862EUH-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862EUH-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 LTC3862EUH-2#TRPBF?
For technical support, including LTC3862EUH-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862EUH-2#TRPBF requirements.
6.How does Aetrix verify that LTC3862EUH-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3862EUH-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 LTC3862EUH-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3862EUH-2#TRPBF?
All LTC3862EUH-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862EUH-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 LTC3862EUH-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3862EUH-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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