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Analog Devices Inc. LTC3860IUH#TRPBF
- Part No.:
- LTC3860IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3860IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,117
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Product details
Overview
LTC3860IUH#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% reference accuracy, differential remote sense, and programmable 250kHz–1.25MHz switching frequency. It is used in high-current telecom and industrial power supplies for DSPs, ASICs, and distributed systems.
For engineers reviewing the LTC3860IUH#TRPBF datasheet, LTC3860IUH#TRPBF pinout, LTC3860IUH#TRPBF application, or LTC3860IUH#TRPBF equivalent, key selection considerations include its dual-phase voltage mode architecture with integrated current-sharing loop, VCC-referenced 0.6V feedback threshold, 32-pin 5mm × 5mm QFN package with exposed thermal pad, –40°C to 125°C operating junction temperature, and support for prebiased load startup with inductor current reversal disable.
Technical Context
The LTC3860IUH#TRPBF implements a constant-frequency voltage-mode control architecture 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, low-offset (<2mV), high-bandwidth (20MHz) translation of load-side voltage to local ground reference.
Current sharing is achieved through per-phase current sense amplifiers (ISNS1P/ISNS1N, ISNS2P/ISNS2N), master-slave IAVG averaging, and integrator-based duty-cycle correction. Overcurrent protection uses programmable ILIM pins (20μA source), while soft-start and tracking are controlled via internal 2.5μA current sources on TRACK/SS1/SS2 pins - with automatic reset during shutdown or fault conditions.
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 core supplies with direct regulation down to 600mV reference. |
| Switching Frequency | 250kHz to 1.25MHz - adjustable via FREQ pin resistor or external CLKIN; enables compact magnetics and fast transient response. |
| Reference Accuracy | ±0.75% at 0.6V - ensures tight output regulation across temperature (–40°C to 125°C). |
| Operating Temp | –40°C to 125°C junction - qualified for industrial and extended-temperature embedded power systems. |
| Package | 32-pin 5mm × 5mm QFN with exposed SGND pad - provides low thermal resistance (θJA = 34°C/W) and high-density layout compatibility. |
| Current Sensing | Lossless DCR or precision resistor - eliminates sense resistor power loss while maintaining ±1% current balance between phases. |
Pinout & Package
Package: 32-lead plastic QFN (5mm × 5mm), exposed thermal pad (Pin 33) electrically connected to SGND and must be soldered to PCB for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Chip supply input | 3V–5.5V bias rail; requires local 0.1–1μF ceramic bypass to SGND for stable internal circuitry. |
| FB1/FB2 (Pins 2, 8) | Error amplifier inverting inputs | Connect to resistor divider from VOUT for local or remote sensing; tied to VCC to three-state unused EA in multiphase configs. |
| COMP1/COMP2 (Pins 3, 7) | Error amplifier outputs | Drive PWM comparators directly; low-impedance op-amp outputs - not paralleled unless master/slave configured. |
| VSNSP/VSNSN (Pins 6, 5) | Differential remote sense inputs | Connect to load-side VOUT and sense ground; enable <1% total output error by eliminating PCB IR drop. |
| ISNS1P/ISNS1N (Pins 22, 21) ISNS2P/ISNS2N (Pins 19, 20) |
Current sense amplifier inputs | Accept DCR voltage across inductor or sense resistor; support bidirectional sensing with NOC protection. |
| ILIM1/ILIM2 (Pins 23, 18) | Overcurrent threshold set | 20μA current source to SGND - sets OC trip point; enables programmable phase current limit matching. |
| RUN1/RUN2 (Pins 24, 17) | Channel enable/disable control | 1.5μA internal pull-up; >2.25V enables channel, <2V forces shutdown - supports independent sequencing. |
| TRACK/SS1/SS2 (Pins 32, 9) | Soft-start/tracking ramp input | 2.5μA internal current source charges external capacitor; controls output ramp rate or tracks external supply. |
| CLKIN/CLKOUT (Pins 11, 12) | External clock sync interface | Accepts 250kHz–1.25MHz external clock; CLKOUT drives next IC's CLKIN for deterministic phase alignment. |
| PHSMD (Pin 13) | Phase relationship selector | Configures 0°/60°/90°/120°/180°/240° phase offsets between channels or CLKOUT for optimal ripple cancellation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel voltage-mode control | Enables independent or synchronized 1–12-phase operation with deterministic timing and minimal external components. |
| Differential remote output sensing | Compensates for PCB trace resistance up to 50mΩ, maintaining ±0.75% regulation accuracy at the load point. |
| Programmable current sharing | Uses IAVG averaging and per-phase integrators to maintain ≤±1% current mismatch across phases under dynamic load. |
| Safely powers prebiased loads | Disables bottom MOSFET during soft-start until TRACK/SS reaches 0.6V, preventing reverse current damage. |
| Line feedforward compensation | VINSNS input modulates PWM ramp in real time, reducing line-step overshoot/undershoot by >50% vs standard voltage mode. |
Applications
| Telecom Power Systems | DSP/ASIC Core Supplies |
|---|---|
|
Use Scenario: High-current 12V-to-1.2V conversion for 50A+ baseband processors in 5G radio units. IC Role / Device Role / Timing Role: Dual-phase controller managing two 25A phases with interleaved 180° timing to halve input/output ripple. Use Value: Achieves >92% efficiency at full load while meeting strict EMI limits via fixed-frequency operation and precise phase alignment. |
Use Scenario: Sequenced multi-rail startup for FPGA + memory subsystems requiring 1.0V, 1.2V, and 1.8V with tracking. IC Role / Device Role / Timing Role: Master-slave configuration where LTC3860IUH#TRPBF controls primary rail and tracks secondary rails via TRACK/SS pins. Use Value: Eliminates need for external tracking ICs; ensures <100ns skew between rail ramps and prevents latch-up during power-on. |
| Industrial Distributed Power | High-Density Server VRMs |
|
Use Scenario: 48V intermediate bus conversion to 3.3V/5V for PLC I/O modules operating in –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Single LTC3860IUH#TRPBF in 2-phase mode with external gate drivers and 60V MOSFETs. Use Value: Maintains regulation over full temperature range with no derating; UVLO and PGOOD ensure safe startup under brownout conditions. |
Use Scenario: 12V-to-0.8V conversion delivering 120A to CPU cores using six paralleled LTC3860 controllers in 12-phase topology. IC Role / Device Role / Timing Role: One master LTC3860IUH#TRPBF daisy-chained via CLKOUT→CLKIN to five slaves for deterministic 30° phase offset. Use Value: Reduces input capacitance requirement by 75% vs single-phase design; enables <10μs load-step response with <20mV deviation. |
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 |
|---|---|---|---|
| MP2950GQ-10 | Current-mode control; integrated MOSFET drivers; 4.5V–16V VIN; fixed 600kHz/800kHz options only. | Targeted at lower-power client VRMs; lacks remote sense, DCR sensing, and PHSMD/CLKOUT for >2-phase expansion. | Choose MP2950GQ-10 for cost-sensitive, space-constrained designs below 40A where programmability and scalability are secondary. |
| TPS546D24RQFT | Single-chip 60A buck converter with PMBus; integrated power stages; 4.5V–18V VIN; digital loop compensation. | Designed for plug-and-play digital power systems; no discrete driver/MOSFET flexibility or analog current sharing loop. | Choose TPS546D24RQFT when digital telemetry, fault logging, and auto-compensation are required - not for analog multiphase expansion. |
Compared with MP2950GQ-10 and TPS546D24RQFT, the LTC3860IUH#TRPBF offers superior analog current sharing accuracy, wider VIN/VOUT range, true remote sensing, and scalable daisy-chain multiphase capability - making it the preferred choice for high-reliability, high-current industrial and telecom power systems requiring design flexibility and long-term component availability.
Availability
LTC3860IUH#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and high-performance computing applications requiring stable component supply, extended temperature operation, and long-lifecycle support.
Supply support for LTC3860IUH#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3860IUH#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 efficiency, thermal management, and phase scalability are critical.
FAQ
What is the maximum number of phases supported by the LTC3860IUH#TRPBF?
The LTC3860IUH#TRPBF itself is a dual-phase controller, but up to six LTC3860IUH#TRPBF ICs can be daisy-chained using CLKOUT and CLKIN pins to implement 1-, 2-, 3-, 4-, 6-, or 12-phase operation. Phase alignment is controlled via the PHSMD pin, enabling precise ripple cancellation and current balancing across all phases.
Does the LTC3860IUH#TRPBF support prebiased load startup?
Yes, the LTC3860IUH#TRPBF safely powers prebiased loads by disabling inductor current reversal during soft-start. The bottom MOSFET remains off until the TRACK/SS pin voltage reaches 0.6V, preventing reverse current flow and potential damage to downstream circuitry or the controller itself.
How is current sharing accuracy maintained between phases in the LTC3860IUH#TRPBF?
The LTC3860IUH#TRPBF maintains current sharing via an auxiliary analog current-sharing loop: per-phase current sense amplifiers feed into OC comparators and an IAVG averaging node. Each slave phase integrates the difference between its sensed current and the master's IAVG voltage, dynamically adjusting duty cycle to achieve ≤±1% current match across phases under steady-state and transient conditions.
Can the LTC3860IUH#TRPBF operate with lossless inductor DCR sensing only - no sense resistor?
Yes, the LTC3860IUH#TRPBF fully supports lossless DCR current sensing using the ISNS1P/ISNS1N and ISNS2P/ISNS2N pins. It includes dedicated current sense amplifiers with 18.5V/V gain and input common-mode range from –0.3V to (VCC + 0.1V), enabling accurate DCR voltage measurement across the inductor's RC network without added power loss.
What is the function of the VINSNS pin on the LTC3860IUH#TRPBF?
The VINSNS pin on the LTC3860IUH#TRPBF provides line feedforward compensation by injecting input voltage variations directly into the PWM comparator ramp generator. This real-time adjustment reduces output voltage deviation during line transients by >50%, improves loop stability independence from VIN, and allows use of smaller output capacitors in high-dV/dt environments.
LTC3860IUH#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)
LTC3860IUH#TRPBF FAQ
1.How can I place an order for LTC3860IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3860IUH#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 LTC3860IUH#TRPBF reliable?
The price and inventory of LTC3860IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3860IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3860IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3860IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3860IUH#TRPBF?
LTC3860IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3860IUH#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 LTC3860IUH#TRPBF?
For technical support, including LTC3860IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3860IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3860IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3860IUH#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 LTC3860IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3860IUH#TRPBF?
All LTC3860IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3860IUH#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 LTC3860IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3860IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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