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Analog Devices Inc. LTC3865IUH-1#TRPBF
- Part No.:
- LTC3865IUH-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3865IUH-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
LTC3865IUH-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual, 2-phase synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It delivers precise dual-output regulation (e.g., 1.5V/15A and 1.2V/15A), supports 4.5V–38V input, operates up to 770kHz with phase-lock capability, and features independent track/soft-start, OPTI-LOOP® compensation, and pin-selectable VID programming - used in high-density server VRMs and telecom power distribution systems.
For engineers reviewing the LTC3865IUH-1#TRPBF datasheet, LTC3865IUH-1#TRPBF pinout, LTC3865IUH-1#TRPBF application, or LTC3865IUH-1#TRPBF equivalent, key selection criteria include dual 180° phased operation, I-grade temperature range (–40°C to 125°C), QFN-32 package thermal performance (θJA = 34°C/W), RSENSE/DCR current sensing flexibility, and programmable current limit via ILIM pin.
Technical Context
The LTC3865IUH-1#TRPBF implements a constant-frequency current-mode control architecture with two independent channels operating 180° out-of-phase to minimize input/output ripple and EMI. Each channel uses an error amplifier (EA) with transconductance of 2.2 mmho and ITH-controlled peak current limiting, where ITH voltage (0.5V–1.6V) directly sets the current comparator threshold.
It integrates dual N-channel gate drivers (TG/BG) with 2.6Ω pull-up / 1.5Ω pull-down on TG and 3Ω/1.4Ω on BG, supports three light-load modes (Burst Mode®, pulse-skipping, forced CCM) selected via MODE/PLLIN, and provides separate PGOOD1/PGOOD2 open-drain outputs with ±10% trip window and 100μs blanking time - all within a single 5mm × 5mm QFN package with exposed SGND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide-range industrial, telecom, and server inputs without pre-regulation. |
| Operating Temperature | –40°C to 125°C (I-grade) - qualified for harsh environments including base station power and automotive under-hood applications. |
| Switching Frequency | 250kHz to 770kHz, phase-lockable - enables EMI reduction via synchronization and optimized magnetics sizing. |
| Output Voltage Accuracy | ±1% over temp (I-grade) - ensures tight regulation for CPU/GPU core rails requiring stable 1.2V/1.5V supplies. |
| Current Sense Threshold | Default 50mV (LTC3865-1 variant) - fixed precision threshold eliminates external resistor tolerance errors in current foldback protection. |
| Efficiency | Up to 95% - achieved via low-RDS(on) gate drive, minimized dead-time losses, and optimized driver timing (30ns TG/BG delay). |
| Package | 32-pin 5mm × 5mm QFN with exposed SGND pad - provides low thermal resistance (θJC = 3°C/W) for high-power density layouts. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), rated for θJA = 34°C/W and θJC = 3°C/W. Exposed pad must be soldered to PCB for thermal and signal integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VOSENSE1 / VOSENSE2 (1, 8) | Error amplifier feedback input | Accepts remote-sensed output voltage or external divider output - enables accurate regulation despite PCB IR drop. |
| TK/SS1 / TK/SS2 (2, 7) | Soft-start / tracking control | Internal 1.3μA current charges external capacitor to ramp output voltage; supports master-slave tracking for sequencing. |
| ITH1 / ITH2 (3, 6) | Error amplifier output / current threshold | Voltage (0.5V–1.6V) sets peak inductor current; direct interface to compensation network and current foldback. |
| VID11/12/21/22 (4,5,12,28) | Output voltage programming | Binary-selects 9 preset VOUT values (0.6V–5.0V) without external resistors - simplifies BOM and layout for multi-rail systems. |
| PGOOD1 / PGOOD2 (14, 13) | Independent power-good indicators | Open-drain outputs assert low when respective VOUT deviates >±10%; 100μs blanking prevents false trips during transients. |
| MODE/PLLIN (27) | Mode selection / sync input | Selects Burst Mode® (float), pulse-skip (INTVCC), or forced CCM (SGND); accepts external clock for phase synchronization. |
| FREQ (29) | Oscillator frequency setting | 7.5μA sink current into external resistor sets frequency from 250kHz to 770kHz - enables precise EMI band placement. |
| ILIM (13) | Current sense threshold select | On LTC3865IUH-1#TRPBF, fixed at 50mV - eliminates configuration risk and improves short-circuit response consistency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180° phased controllers | Reduces input RMS current by ~30% and output voltage ripple amplitude by ~70% vs. single-phase designs. |
| OPTI-LOOP® compensation | Enables stable loop response across wide ranges of output capacitance (10μF–1000μF) and ESR (0.5mΩ–50mΩ) without redesign. |
| Independent track/soft-start | Allows precise power sequencing (e.g., VDDQ before VDD) and controlled inrush current limiting per rail. |
| RSENSE or DCR current sensing | Supports either discrete shunt resistors (high accuracy) or copper trace/inductor DCR (zero power loss) sensing topologies. |
| Output OV protection + reverse current limit | Prevents damage during load dump or hot-swap events; blocks reverse current flow to protect upstream sources. |
Applications
| Server VRM | Telecom Power Shelf |
|---|---|
Use Scenario: Dual-rail core voltage regulation for multi-core CPUs and FPGAs in 1U/2U rack servers. IC Role / Device Role / Timing Role: Primary dual-phase controller managing 1.2V/15A and 1.5V/15A outputs with strict sequencing and transient response. Use Value: 95% efficiency at full load reduces thermal load in constrained airflow environments; 180° phasing cuts input capacitor count by 50%. | Use Scenario: Intermediate bus converter supplying multiple downstream POL modules in 48V telecom systems. IC Role / Device Role / Timing Role: High-voltage input (36–75V) step-down controller generating stable 12V/24V intermediate rails. Use Value: 38V max VIN rating enables direct 48V operation; phase-locking synchronizes switching with downstream converters to suppress beat frequencies. |
| Industrial PLC Power | Automotive ADAS Domain Controller |
Use Scenario: Robust dual-output supply for I/O modules and real-time processors in factory automation equipment. IC Role / Device Role / Timing Role: Industrial-grade controller delivering isolated 5V logic and 3.3V MCU rails with extended temperature support. Use Value: –40°C to 125°C operation ensures reliability in uncooled enclosures; independent RUN pins enable firmware-controlled rail shutdown. | Use Scenario: Power management for vision processing units and radar SoCs in autonomous driving ECUs. IC Role / Device Role / Timing Role: Dual-phase controller generating 1.0V AI accelerator and 1.8V memory rails with fast load-step response. Use Value: Burst Mode® extends battery runtime in sleep states; PGOOD1/PGOOD2 enable safe boot sequencing and fault isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3865EUH-1#TRPBF | E-grade (0°C to 85°C) vs. I-grade; otherwise identical pinout, functionality, and electrical specs. | Suitable for commercial/office environments only; not rated for extended temperature industrial or automotive use. | Select LTC3865IUH-1#TRPBF when operation beyond 85°C ambient is required - e.g., enclosed industrial cabinets or under-hood locations. |
| MP2960DQ-LF-Z | Single-chip dual-phase controller with integrated MOSFET drivers and PMBus interface; no VID pins; different pinout and compensation scheme. | Targeted at digitally managed power systems requiring telemetry and dynamic margining; lacks analog VID simplicity. | Choose MP2960DQ-LF-Z only if digital monitoring/control is mandatory; LTC3865IUH-1#TRPBF offers superior analog stability and lower BOM cost for fixed-rail designs. |
Compared with LTC3865EUH-1#TRPBF, the LTC3865IUH-1#TRPBF guarantees full –40°C to 125°C performance, making it essential for mission-critical thermal environments; versus MP2960DQ-LF-Z, it provides simpler analog design, higher noise immunity, and proven field reliability in analog-heavy infrastructure systems.
Availability
LTC3865IUH-1#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power shelves, and industrial PLCs requiring stable component supply, long-term lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC3865IUH-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 its high-performance power management portfolio with rigorous qualification standards and long-term product roadmaps.
The LTC3865 series belongs to Linear's flagship high-efficiency synchronous controller family, designed specifically for demanding multi-rail, high-current DC/DC conversion in datacenter, telecom, and industrial infrastructure.
FAQ
What is the key difference between LTC3865IUH-1#TRPBF and LTC3865IUH#TRPBF?
The LTC3865IUH-1#TRPBF fixes the current sense threshold at 50mV (per Note 8), eliminating ILIM pin configuration and ensuring consistent short-circuit protection behavior. In contrast, LTC3865IUH#TRPBF allows adjustable thresholds (22–84mV) via the ILIM pin. Both share identical I-grade temperature range, pinout, and VID programming.
Does LTC3865IUH-1#TRPBF support phase synchronization with external clocks?
Yes, LTC3865IUH-1#TRPBF supports phase synchronization via the MODE/PLLIN pin. When an external clock signal is applied to this pin, the internal oscillator locks to it, enabling precise timing alignment across multiple controllers - critical for reducing system-level EMI in multi-rail power architectures.
How does the OPTI-LOOP® compensation in LTC3865IUH-1#TRPBF simplify design?
OPTI-LOOP® compensation in LTC3865IUH-1#TRPBF dynamically adjusts loop gain based on output capacitor ESR and capacitance, allowing stable operation across a wide range (10μF–1000μF, 0.5mΩ–50mΩ) without manual compensation network changes - significantly reducing design iterations and validation time for varying output filter configurations.
Can LTC3865IUH-1#TRPBF drive both high-side and low-side N-channel MOSFETs?
Yes, LTC3865IUH-1#TRPBF integrates dual high-side (TG1/TG2) and low-side (BG1/BG2) N-channel MOSFET drivers with matched timing (30ns dead-time control), 2.6Ω/1.5Ω TG drive strength, and bootstrap circuitry - enabling efficient synchronous rectification without external driver ICs or P-channel devices.
What is the function of the separate PGOOD1 and PGOOD2 pins on LTC3865IUH-1#TRPBF?
The separate PGOOD1 and PGOOD2 pins on LTC3865IUH-1#TRPBF provide independent open-drain power-good status signals for each output channel, asserting low when the respective VOSENSE voltage deviates more than ±10% from regulation - enabling precise fault isolation, safe power sequencing, and system-level health monitoring in dual-rail applications.
LTC3865IUH-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 770kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3865IUH-1#TRPBF FAQ
1.How can I place an order for LTC3865IUH-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3865IUH-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 LTC3865IUH-1#TRPBF reliable?
The price and inventory of LTC3865IUH-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 LTC3865IUH-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3865IUH-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3865IUH-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3865IUH-1#TRPBF?
LTC3865IUH-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3865IUH-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 LTC3865IUH-1#TRPBF?
For technical support, including LTC3865IUH-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3865IUH-1#TRPBF requirements.
6.How does Aetrix verify that LTC3865IUH-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3865IUH-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 LTC3865IUH-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3865IUH-1#TRPBF?
All LTC3865IUH-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3865IUH-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 LTC3865IUH-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3865IUH-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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