My Inquiry
My Account
Analog Devices Inc. LTC3860EUH#PBF
- Part No.:
- LTC3860EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3860EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:221
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3860EUH#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, voltage-mode, multiphase synchronous step-down DC/DC controller supporting up to 12-phase operation via parallel ICs. It delivers precise current sharing across phases using lossless DCR sensing, features ±0.75% 0.6V reference accuracy, operates from 3V–24V input to 0.6V–(VCC–0.5V) output, and supports programmable switching frequency from 250kHz to 1.25MHz. It is used in high-current telecom and DSP power supplies requiring tight regulation and fast transient response.
For engineers reviewing the LTC3860EUH#PBF datasheet, LTC3860EUH#PBF pinout, LTC3860EUH#PBF application, or LTC3860EUH#PBF equivalent, key selection considerations include its dual-phase voltage-mode architecture with differential remote sense, programmable soft-start/tracking via TRACK/SS pins, lossless current sensing capability, 32-pin 5mm × 5mm QFN package with exposed thermal pad, and support for prebiased load startup without inductor current reversal.
Technical Context
The LTC3860EUH#PBF implements a constant-frequency voltage-mode control loop with high-bandwidth, low-offset error amplifiers (75dB open-loop gain, 20MHz unity-gain bandwidth) and a dedicated differential remote sense amplifier (±2mV offset, 45V/μs slew rate). Its architecture integrates line feedforward compensation via VINSNS to suppress input line transients independently of the feedback loop.
Current sharing is achieved through per-phase inductor current sampling, master-slave averaging at the IAVG pin, and integrator-based duty-cycle correction - enabling stable 2-, 3-, 4-, 6-, or 12-phase operation. Overcurrent protection uses programmable ILIM pins (20μA current source), while shutdown, UVLO (3.0V rising), and PGOOD monitoring are implemented with independent RUN1/RUN2 and PGOOD1/PGOOD2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 24V - supports wide-input telecom and industrial rails without external regulators |
| VOUT Range | 0.6V to (VCC – 0.5V) - enables sub-1V DSP/ASIC core supplies with internal 0.6V reference |
| Switching Frequency | 250kHz to 1.25MHz - adjustable via FREQ resistor or external CLKIN; enables compact magnetics and high loop bandwidth |
| Reference Accuracy | ±0.75% at 0.6V - ensures <±4.5mV output voltage error over temperature and line, critical for low-voltage loads |
| Current Sensing | Lossless DCR or precision sense resistor - eliminates power loss and board space of shunt resistors while maintaining phase balance |
| Package | 32-pin 5mm × 5mm QFN with exposed SGND pad - provides low θJA (34°C/W) for high-power density thermal management |
| Operating Temp | –40°C to +125°C junction - qualified for industrial and telecom base station environments |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = SGND). Must be soldered to PCB for rated thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (1) | Chip supply input | Bypassed locally to SGND; powers internal circuitry (3V–5.5V range) |
| FB1/FB2 (2,8) | Error amplifier inverting inputs | Connect to resistor divider from VOUT for local or remote sensing; enable independent or master-slave configuration |
| COMP1/COMP2 (3,7) | Error amplifier outputs | Drive PWM comparators; must not be shorted-master/slave mode requires FBx tied to VCC to three-state slave COMP |
| VSNSP/VSNSN (6,5) | Differential remote sense inputs | Connect directly to load VOUT and sense ground; reject IR drop in PCB traces for ±2mV sensing accuracy |
| ISNS1P/ISNS1N (22,21) | Phase 1 current sense inputs | Interface to DCR network or sense resistor; support lossless current monitoring with 18.5× gain and ±2.2mV offset |
| RUN1/RUN2 (24,17) | Independent channel enable | Logic-controlled startup/shutdown (2.25V threshold); 1.5μA internal pull-up allows simple resistor-based sequencing |
| TRACK/SS1/SS2 (32,9) | Soft-start and tracking input | 2.5μA current source charges external capacitor; enables programmable ramp or ratiometric tracking of another supply |
| CLKOUT/CLKIN (12,11) | PLL synchronization interface | Enable multi-IC phase interleaving without external PLL filter; CLKOUT drives CLKIN of next IC in daisy chain |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel voltage-mode control | Enables two independent or interleaved synchronous buck channels with shared or separate feedback loops |
| Programmable current sharing | IAVG pin and per-phase integrators allow precise current balancing across up to 12 phases without external DACs or controllers |
| Prebiased load startup | Bottom MOSFET disabled during soft-start; prevents reverse current flow when powering already-charged outputs |
| Differential remote voltage sensing | VSNSP/VSNSN/VSNSOUT path achieves <±2mV sensing error, eliminating trace resistance impact on regulation accuracy |
| Line feedforward compensation | VINSNS input modulates PWM ramp in real time, reducing line-step overshoot/undershoot by >50% vs standard voltage-mode control |
Applications
| Telecom Base Station Power | DSP/ASIC Core Supply |
|---|---|
Use Scenario: High-current, tightly regulated 1.2V/50A supply for multicore digital signal processors in 5G radio units. IC Role / Device Role / Timing Role: Dual-phase controller managing two synchronous buck stages with interleaved 600kHz switching and active current sharing. Use Value: Achieves <±1% output regulation under 20A/μs load transients and maintains <1% current imbalance between phases using DCR sensing. |
Use Scenario: Low-noise, fast-response 0.85V core rail for FPGA or ASIC in edge computing modules. IC Role / Device Role / Timing Role: Voltage-mode controller with differential remote sense and programmable soft-start to track auxiliary 3.3V supply during power-up. Use Value: Enables safe ratiometric startup into prebiased loads while maintaining ±0.75% reference accuracy down to 0.6V output. |
| Industrial PLC CPU Module | High-Density Server VRM |
Use Scenario: Robust 1.8V/30A supply in programmable logic controller CPU board operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-phase controller with independent RUN1/RUN2 sequencing and UVLO hysteresis (100mV) for cold-start reliability. Use Value: Guarantees stable start-up across full industrial temperature range with no output oscillation or latch-up during brownout recovery. |
Use Scenario: Scalable 12-phase VRM for AI accelerator cards requiring >200A at 0.75V with minimal board area. IC Role / Device Role / Timing Role: Master controller daisy-chained with five additional LTC3860EUH#PBF ICs via CLKOUT→CLKIN, synchronized at 800kHz. Use Value: Reduces input/output ripple by √12 vs single-phase, enabling smaller bulk capacitors and meeting strict PCIe CEM v6.0 ripple limits. |
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 |
|---|---|---|---|
| MP2960GQ-Z | Current-mode control; integrated MOSFET drivers; fixed 600kHz/1MHz options only; no remote differential sense amplifier | Targeted at cost-sensitive, medium-current (<30A/channel) applications where layout simplicity outweighs sensing accuracy | Select MP2960GQ-Z if integrated gate drive and smaller BOM count are prioritized over ±2mV remote sensing and programmable frequency range |
| TPS546D24ARVFT | Single-chip PMBus-enabled 60A buck converter; includes telemetry, margining, and digital loop compensation; no discrete DCR sensing support | Suitable for systems requiring real-time telemetry, firmware updates, and adaptive loop tuning - not for analog-only or ultra-low-latency designs | Select TPS546D24ARVFT when digital monitoring, fault logging, and dynamic loop adjustment are required, and higher unit cost is acceptable |
Compared with MP2960GQ-Z and TPS546D24ARVFT, the LTC3860EUH#PBF offers superior analog precision (±0.75% reference, ±2mV sense offset), flexible analog current sharing architecture, and true dual independent channel control - making it optimal for high-reliability, high-accuracy analog power systems where digital overhead is unnecessary.
Availability
LTC3860EUH#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and high-performance computing applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3860EUH#PBF 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 continuity, technical documentation, and manufacturing for all Linear power management ICs including the LTC3860 series.
The LTC3860EUH#PBF belongs to Linear's high-performance PolyPhase® controller family, designed specifically for high-current, multiphase DC/DC conversion in telecom, datacom, and industrial systems demanding exceptional transient response and current matching.
FAQ
What is the maximum number of phases supported by the LTC3860EUH#PBF?
The LTC3860EUH#PBF itself is a dual-phase controller, but up to six LTC3860EUH#PBF ICs can be daisy-chained via CLKOUT and CLKIN pins to implement 1-, 2-, 3-, 4-, 6-, or 12-phase operation. Phase relationships are controlled using the PHSMD pin, and current sharing is maintained across all phases using the IAVG pin interconnection and per-phase integrators. This scalability makes the LTC3860EUH#PBF suitable for >200A applications without redesigning the control architecture.
Does the LTC3860EUH#PBF support startup into a precharged output?
Yes, the LTC3860EUH#PBF safely powers prebiased loads by disabling the bottom MOSFET during soft-start. Inductor current reversal is suppressed until the TRACK/SS ramp reaches 0.6V, preventing reverse current flow from the output capacitor. The internal 2ms default soft-start or user-programmed ramp via external capacitor on TRACK/SS pins ensures controlled voltage rise. This behavior is confirmed in the datasheet's "Safely Powers a Prebiased Load" feature and functional diagram timing analysis.
How does the LTC3860EUH#PBF achieve accurate current sharing between phases?
The LTC3860EUH#PBF achieves accurate current sharing using a dedicated current-sense amplifier per phase (18.5× gain, ±2.2mV offset), an IAVG pin that stores the master phase's average current on an external capacitor, and per-phase integrators that compare individual phase current to the master average. This analog current-sharing loop operates independently of the main voltage loop and maintains <±3% current imbalance across phases - verified in typical performance plots showing 2-phase operation with 50% inductor mismatch.
Can the LTC3860EUH#PBF operate with only one channel active?
Yes, the LTC3860EUH#PBF supports independent single-channel operation. To use only Channel 1, tie RUN2 to SGND to disable Channel 2, connect FB2 to VCC to three-state COMP2, and leave ISNS2P/ISNS2N unconnected. The remaining Channel 1 retains full functionality - including remote sensing, programmable frequency, soft-start, and overcurrent protection. This flexibility is documented in the "OPERATION" section and pin function descriptions for FB2 and RUN2.
What is the purpose of the VINSNS pin on the LTC3860EUH#PBF?
The VINSNS pin on the LTC3860EUH#PBF provides line feedforward compensation by injecting input voltage variations directly into the PWM comparator ramp generator. This causes instantaneous duty-cycle adjustment proportional to VIN changes, significantly improving line transient response - reducing output deviation by >50% during 7V→14V steps, as shown in Figure 3860 G15/G16. An external RC filter can be added to VINSNS to reject noise without degrading feedforward effectiveness.
LTC3860EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Frequency - Switching:
- 250kHz ~ 1.25MHz
- Duty Cycle (Max):
- 91.5%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase 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)
LTC3860EUH#PBF FAQ
1.How can I place an order for LTC3860EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3860EUH#PBF 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 LTC3860EUH#PBF reliable?
The price and inventory of LTC3860EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3860EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3860EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3860EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3860EUH#PBF?
LTC3860EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3860EUH#PBF 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 LTC3860EUH#PBF?
For technical support, including LTC3860EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3860EUH#PBF requirements.
6.How does Aetrix verify that LTC3860EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3860EUH#PBF 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 LTC3860EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3860EUH#PBF?
All LTC3860EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3860EUH#PBF, 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 LTC3860EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3860EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3860EUH#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
