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Analog Devices Inc. LTC3860EUH#TRPBF
- Part No.:
- LTC3860EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3860EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3860EUH#TRPBF 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 or precision resistor-based sensing, operates from 3V–24V input to 0.6V–(VCC–0.5V) output, and features ±0.75% 0.6V reference accuracy with differential remote sense for <2mV offset. It is used in high-current telecom power supplies and DSP/ASIC core rails.
For engineers reviewing the LTC3860EUH#TRPBF datasheet, LTC3860EUH#TRPBF pinout, LTC3860EUH#TRPBF application, or LTC3860EUH#TRPBF equivalent, key selection considerations include its 32-pin 5mm × 5mm QFN package, programmable 250kHz–1.25MHz switching frequency, dual independent RUN control, TRACK/SS soft-start/tracking capability, and IAVG-based current-sharing architecture for phase balancing.
Technical Context
The LTC3860EUH#TRPBF implements constant-frequency voltage-mode control with two independent error amplifiers (COMP1/COMP2), each driving a PWM comparator with line feedforward compensation via VINSNS. Its differential remote sense amplifier (VSNSP/VSNSN → VSNSOUT) provides unity-gain, 20MHz bandwidth, <2mV input offset sensing referenced to SGND - enabling accurate load-point regulation despite PCB IR drop.
Current sharing is achieved through per-phase current sense amplifiers (ISNS1P/ISNS1N, ISNS2P/ISNS2N) feeding OC comparators and an auxiliary integrator loop that compares individual phase current to master IAVG voltage. Phase synchronization across multiple controllers uses CLKOUT and PHSMD pins to configure 120°, 180°, or 240° inter-channel and CLKOUT offsets - critical for thermal and EMI management in high-density 6- or 12-phase designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 24V - supports wide-input telecom and industrial bus rails without pre-regulation. |
| VOUT Range | 0.6V to (VCC – 0.5V) - enables sub-1V core supplies with tight tolerance via ±0.75% reference. |
| Switching Frequency | 250kHz to 1.25MHz - adjustable via FREQ pin resistor or external CLKIN; higher frequencies reduce inductor/capacitor size. |
| Current Sensing | Lossless DCR or precision resistor - eliminates sense resistor power loss while maintaining ±2mV offset over temperature. |
| Operating Temp | –40°C to 125°C junction - qualified for industrial and telecom base station environments. |
| Package | 32-pin 5mm × 5mm QFN with exposed SGND pad - enables high-power dissipation (θJA = 34°C/W) and low-inductance grounding. |
| Soft-Start Time | 2ms internal ramp (TYP) - prevents inrush into prebiased loads; extended via external capacitor on TRACK/SS pins. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed SGND pad (Pin 33), requiring soldering to PCB for thermal performance (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Chip supply input | 3V–5.5V bias rail; must be bypassed locally with 0.1–1μF ceramic capacitor. |
| FB1/FB2 (Pins 2, 8) | Error amplifier inverting inputs | Connect to resistor divider from VOUT or to VSNSOUT for remote sensing; bottom of divider tied to SGND. |
| COMP1/COMP2 (Pins 3, 7) | Error amplifier outputs | Drive PWM duty cycle; cannot be directly paralleled - master/slave configuration required for multiphase. |
| VSNSP/VSNSN (Pins 6, 5) | Differential remote sense inputs | VSNSP connects to load VOUT; VSNSN connects to load ground - enables <2mV sensing offset at point-of-load. |
| ISNS1P/ISNS1N (Pins 22, 21) | Phase 1 current sense inputs | Accept DCR voltage across inductor or sense resistor; support lossless or precision current monitoring. |
| RUN1/RUN2 (Pins 24, 17) | Independent channel enable | Logic-high (>2.25V) enables channel; internal 1.5μA pull-up allows simple open-drain control. |
| TRACK/SS1/SS2 (Pins 32, 9) | Soft-start and tracking input | 2.5μA internal current source ramps external capacitor; enables programmable start-up or ratiometric tracking. |
| IAVG (Pin 28) | Average current monitor | Outputs voltage proportional to master phase average current; tied to GND for independent dual-output operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage-mode control loops | Enables true dual-output operation or master/slave 2-phase configuration with separate RUN/SS control per channel. |
| Programmable current limit via ILIM1/ILIM2 | 20μA current source sets overcurrent threshold with external resistor - supports adaptive protection across load conditions. |
| Prebiased load startup support | Bottom MOSFET disabled during soft-start; periodic 20ns pulses every 8 cycles recharge gate driver capacitors safely. |
| PLL-synchronizable clock with CLKOUT daisy-chaining | Allows up to six LTC3860EUH#TRPBF controllers to synchronize for 12-phase operation without external PLL filter components. |
| Differential remote sense amplifier | 20MHz bandwidth, 45V/μs slew rate, <2mV offset - eliminates board trace resistance errors for ±0.5% total output regulation. |
Applications
| Telecom Base Station Power | DSP/ASIC Core Supply |
|---|---|
Use Scenario: High-current 12V-to-1.2V conversion for multi-core baseband processors in 4G/5G macrocells. IC Role / Device Role / Timing Role: Dual-phase controller managing parallel power stages with synchronized CLKOUT to minimize input ripple and thermal hotspots. Use Value: Achieves >90% efficiency at 50A with <50mV transient deviation using 0.3μH inductors and 250kHz–600kHz operation. |
Use Scenario: Dynamic voltage scaling for FPGA or DSP cores requiring tightly regulated 0.8V–1.5V rails with fast load-step response. IC Role / Device Role / Timing Role: Voltage-mode controller with 20MHz error amplifier bandwidth and line feedforward compensation for <20μs recovery from 10A load steps. Use Value: Maintains ±0.5% output accuracy under varying die temperature and PCB IR drop via differential remote sensing. |
| Industrial PLC CPU Module | High-Density Server VRM |
Use Scenario: Robust 24V-to-3.3V/1.8V dual-rail supply in harsh industrial environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-channel controller operating independently with separate RUN pins for fault-isolated power sequencing. Use Value: –40°C to 125°C junction rating and undervoltage lockout (2.9V falling) ensure reliable startup under brownout conditions. |
Use Scenario: Scalable 12-phase VRM for AI accelerator cards requiring >300A at 0.8V with strict current balance. IC Role / Device Role / Timing Role: Master controller in daisy-chained LTC3860EUH#TRPBF array using IAVG and PHSMD pins to enforce <5% inter-phase current mismatch. Use Value: Enables phase interleaving with 30° offsets to reduce input/output capacitor RMS current by 40% versus single-phase design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3870IUH#TRPBF | Single-channel, 3–38V VIN, supports up to 6-phase via daisy-chain; lacks dual independent RUN/SS pins and IAVG averaging. | Better suited for cost-sensitive, lower-channel-count systems where independent channel control is unnecessary. | Select when only one output rail is needed and phase count ≤6; not suitable for true dual-output or prebiased load scenarios requiring per-channel soft-start. |
| MP2918GL-Z | Monolithic dual-phase controller (integrated MOSFET drivers); fixed 600kHz/800kHz options; no DCR sensing or CLKOUT daisy-chain. | Targeted at space-constrained consumer/edge compute applications where external drivers are undesirable. | Choose for simplified layout and lower BOM count in non-telecom applications; avoid where DCR sensing, programmable frequency, or >2-phase scalability is required. |
Compared with LTC3870IUH#TRPBF and MP2918GL-Z, the LTC3860EUH#TRPBF uniquely supports dual independent soft-start/tracking, lossless DCR sensing with <2mV offset, and scalable 12-phase operation via CLKOUT/PHSMD - making it optimal for high-reliability, thermally demanding telecom and industrial power systems.
Availability
LTC3860EUH#TRPBF 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 parametric compliance across –40°C to 125°C.
Supply support for LTC3860EUH#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 continuity, technical documentation, and manufacturing for all Linear power management ICs including the LTC3860 series.
The LTC3860EUH#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-current, low-voltage DC/DC conversion in telecom, datacom, and industrial systems where phase interleaving, current sharing, and remote sensing are critical.
FAQ
What is the maximum number of phases supported by the LTC3860EUH#TRPBF?
The LTC3860EUH#TRPBF itself is a dual-phase controller, but up to six LTC3860EUH#TRPBF devices can be daisy-chained using CLKOUT and PHSMD pins to achieve 12-phase operation for ultra-high-current applications such as AI accelerator VRMs. Each device contributes two phases, and phase alignment is programmable in 60° increments.
Does the LTC3860EUH#TRPBF support lossless current sensing?
Yes, the LTC3860EUH#TRPBF supports lossless inductor DCR current sensing via ISNS1P/ISNS1N and ISNS2P/ISNS2N pins, with typical input-referred offset of ±2mV over temperature. It also supports precision resistor-based sensing with identical gain (18.5V/V) and common-mode range (–0.3V to VCC + 0.1V).
How does the LTC3860EUH#TRPBF handle prebiased load startup?
The LTC3860EUH#TRPBF disables the bottom MOSFET during soft-start to prevent discharging prebiased outputs. It applies brief 20ns bottom-gate pulses every 8 switching cycles to recharge external gate driver bootstrap capacitors - ensuring safe startup into loads with residual voltage without damaging downstream circuitry.
What is the function of the IAVG pin on the LTC3860EUH#TRPBF?
The IAVG pin (Pin 28) outputs a voltage proportional to the instantaneous average current of the master phase. When multiple LTC3860EUH#TRPBF controllers are paralleled, connecting all IAVG pins together enables active current sharing. For independent dual-output operation, IAVG must be tied to SGND.
Can the LTC3860EUH#TRPBF operate with only one channel enabled?
Yes, the LTC3860EUH#TRPBF supports independent channel control via RUN1 and RUN2 pins. Either channel can be disabled by pulling its RUN pin below 2V while the other remains active - enabling flexible power sequencing, fault isolation, or single-output operation without hardware modification.
LTC3860EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3860EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3860EUH#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 LTC3860EUH#TRPBF reliable?
The price and inventory of LTC3860EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3860EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3860EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3860EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3860EUH#TRPBF?
LTC3860EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3860EUH#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 LTC3860EUH#TRPBF?
For technical support, including LTC3860EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3860EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3860EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3860EUH#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 LTC3860EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3860EUH#TRPBF?
All LTC3860EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3860EUH#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 LTC3860EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3860EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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