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Analog Devices Inc. LTC3870EUFD#TRPBF
- Part No.:
- LTC3870EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3870EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
LTC3870EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a PolyPhase® step-down slave controller designed for multiphase DC/DC conversion with LTC3880-family master controllers. It delivers precise per-phase current regulation, supports up to 2-phase extension, operates from 4.5V to 60V input, provides 0.5V–14V output voltage control via master interface, and features integrated N-channel MOSFET gate drivers in a 28-pin 4mm × 5mm QFN package - used in high-current telecom power supplies.
For engineers reviewing the LTC3870EUFD#TRPBF datasheet, LTC3870EUFD#TRPBF pinout, LTC3870EUFD#TRPBF application, or LTC3870EUFD#TRPBF equivalent, key selection criteria include phase-locked synchronization range (100kHz–1MHz), programmable CCM/DCM mode per channel, dual independent ITH-based current sharing, EXTVCC support (5V–14V), and guaranteed –40°C to 125°C operation.
Technical Context
The LTC3870EUFD#TRPBF implements a peak current mode architecture synchronized to an external master clock via its SYNC pin, enabling coherent multichip operation without additional I²C addresses. Its dual-channel design uses separate ITH0/ITH1 inputs tied to the master's ITH outputs to enforce real-time current matching across phases.
It relies on external master controllers (e.g., LTC3880) for output voltage regulation and fault management while autonomously executing gate drive timing, phase-shift control (via PHASMD pin), and current limit selection (via ILIM pin). The device integrates 5V INTVCC regulation powered either from VIN or externally via EXTVCC (switchover at 4.8V), with internal LDOs delivering ±2% accuracy under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide-range industrial and telecom inputs; EXTVCC recommended above 15V to reduce thermal stress. |
| Output Voltage Range | 0.5V to 14V - set and regulated by master controller; LTC3870EUFD#TRPBF only enforces current sharing, not voltage loop control. |
| SYNC Frequency Range | 100kHz to 1MHz - enables precise frequency alignment with master; PLL locks to falling edge of external clock. |
| Current Sense Threshold | 45–80mV range selectable via ILIM pin - determines max sense voltage before overcurrent trip; matches LTC3880 MFR_PWM_MODE register setting. |
| Gate Driver Strength | TG RUP: 2.5Ω, BG RDOWN: 1.1Ω - drives standard N-channel MOSFETs with fast 30ns rise/fall times into 3300pF load. |
| Operating Temperature | –40°C to 125°C junction - qualified for industrial and telecom base station environments; θJA = 43°C/W. |
| Package | 28-pin (4mm × 5mm) QFN with exposed SGND pad - requires soldered thermal pad for signal integrity and thermal dissipation. |
Pinout & Package
Package: 28-lead plastic QFN (4mm × 5mm), exposed pad (Pin 29) connected to SGND. Requires PCB soldering of exposed pad for thermal and signal ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENSE0+/ISENSE1+ | Current sense comparator positive input | Connects to DCR network or sense resistor high-side node; ±0.1µA bias current ensures accurate low-offset sensing. |
| ITH0/ITH1 | Current threshold control input | Master-driven analog voltage (0.5V–2.22V) sets per-channel peak inductor current; enables dynamic load-sharing. |
| RUN0/RUN1 | Channel enable input | Logic-high (>2V) enables corresponding phase; internally pulled down (500kΩ); tied to master RUN pins in multiphase systems. |
| SYNC | External clock synchronization input | Falling-edge triggered; synchronizes switching frequency to master controller; must not be left floating. |
| PHASMD | Phase offset programming input | Voltage divider (GND, 1/3INTVCC, 2/3INTVCC, or INTVCC) selects 0°–300° relative phase between channels and SYNC. |
| TG0/TG1, BG0/BG1 | N-channel MOSFET gate drivers | Floating top-gate (TG) and grounded bottom-gate (BG) outputs; integrated anti-shoot-through logic prevents cross-conduction. |
| ILIM | Current range select input | Four-level logic (GND, 1/3INTVCC, 2/3INTVCC, INTVCC) configures high/low current sense thresholds per channel. |
| EXTVCC | External bias supply input | Enables alternate 5V LDO when >4.8V applied; reduces IC self-heating in high-VIN applications; max 14V rating. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® slave architecture | Enables seamless cascading with LTC3880-family masters without extra I²C addressing or firmware changes. |
| Dual independent current control loops | Separate ITH0/ITH1 inputs allow per-phase current regulation and transient response matching in multi-phase stacks. |
| Programmable conduction mode per channel | MODE0/MODE1 pins select forced CCM or DCM - optimizing light-load efficiency vs. output ripple trade-off. |
| Phase-shift programmability | PHASMD pin sets exact 0°–300° phase offsets between channels and SYNC, enabling optimal input/output capacitor RMS current reduction. |
| Integrated gate drivers with fast transitions | 30ns rise/fall times into 3300pF load ensure minimal dead-time loss and robust switching in high-frequency designs. |
Applications
| Telecom Base Station Power | Industrial FPGA/ASIC Core Supply |
|---|---|
|
Use Scenario: High-current, tightly regulated 1.2V/50A core rail for 5G baseband processors with strict transient response requirements. IC Role / Device Role / Timing Role: LTC3870EUFD#TRPBF acts as phase-extending slave, executing gate timing and current balancing under LTC3880 master supervision. Use Value: Enables 4-phase stack with <±2% inter-phase current mismatch and <50µs load-step recovery - meeting 3GPP power integrity specs. |
Use Scenario: Dual-output, 0.85V/40A + 1.8V/30A supply for Xilinx Versal ACAPs in factory automation controllers. IC Role / Device Role / Timing Role: LTC3870EUFD#TRPBF manages second phase pair for 0.85V rail, synchronized to LTC3880 master's 400kHz clock and phase-aligned via PHASMD. Use Value: Reduces input capacitor RMS current by 75% versus single-phase, lowering ESR heating and extending capacitor lifetime in sealed enclosures. |
| High-Power Network Switch PSU | Medical Imaging Power Module |
|
Use Scenario: 12V input to 3.3V/80A intermediate bus in 1RU data center switches requiring >94% full-load efficiency. IC Role / Device Role / Timing Role: LTC3870EUFD#TRPBF serves as second-phase slave in 2+2 interleaved configuration, sharing ITH and SYNC with LTC3880 master. Use Value: Achieves 94.2% efficiency at 80A/3.3V using DCR current sensing and EXTVCC-biased gate drivers - minimizing thermal derating. |
Use Scenario: MRI gradient amplifier auxiliary supply requiring ultra-low noise, high reliability, and fail-safe fault propagation. IC Role / Device Role / Timing Role: LTC3870EUFD#TRPBF operates as redundant phase slave; FAULT0/FAULT1 pins feed back to LTC3880 master GPIO for coordinated shutdown. Use Value: Ensures <100ns fault response time and zero output voltage deviation during single-point failure - satisfying IEC 62304 Class C requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase slave controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3871IUFD#TRPBF | Single-channel, wider input range (4.5V–80V), no PHASMD pin, fixed 180° phase offset | Suitable for 2-phase extensions only; lacks per-channel MODE/ILIM flexibility and phase programmability | Select when cost-sensitive 2-phase extension is sufficient and phase alignment beyond 180° is unnecessary. |
| MP2960AGQSE-LF-Z | Monolithic dual-phase controller with integrated MOSFETs; no external master dependency; 4.5V–16V VIN | Self-contained solution for lower-current (<30A/channel) applications; lacks PMBus interface and digital system management | Choose for space-constrained, medium-power designs where digital power system management is not required. |
Compared with LTC3870EUFD#TRPBF, LTC3871IUFD#TRPBF simplifies 2-phase designs but sacrifices phase-programmability and dual-mode control, while MP2960AGQSE-LF-Z eliminates master-slave complexity at the cost of scalability and telemetry capability in large-scale power systems.
Availability
LTC3870EUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial FPGA power, medical imaging systems, and high-reliability embedded computing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3870EUFD#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 automotive and industrial qualification standards.
The LTC3870EUFD#TRPBF belongs to the PolyPhase® digital power system management product line, engineered specifically to extend LTC3880-family master controllers in high-current, multi-phase DC/DC converters for telecom and industrial applications.
FAQ
What is the primary function of the LTC3870EUFD#TRPBF in a power system?
The LTC3870EUFD#TRPBF functions exclusively as a slave controller in multiphase DC/DC systems, providing per-phase current regulation and gate drive execution under supervision of an LTC3880-family master. It does not regulate output voltage directly; instead, it enforces current sharing via ITH0/ITH1 inputs and synchronizes switching via the SYNC pin. This architecture allows scalable high-current solutions without adding I²C address overhead.
How does the PHASMD pin affect phase alignment in the LTC3870EUFD#TRPBF?
The PHASMD pin on the LTC3870EUFD#TRPBF sets the relative phase offset between its two channels and the external SYNC clock using four discrete voltage levels: GND (0°/180°), 1/3INTVCC (60°/300°), 2/3INTVCC or float (120°/240°), and INTVCC (90°/270°). This enables precise interleaving to minimize input/output capacitor RMS current - critical for reducing EMI and thermal stress in high-power designs.
Can the LTC3870EUFD#TRPBF operate without a master controller?
No, the LTC3870EUFD#TRPBF cannot operate autonomously. It lacks voltage feedback circuitry, PWM generation independence, and fault management logic - all delegated to the master controller (e.g., LTC3880). Without ITH, RUN, SYNC, and FAULT connections to a compatible master, the LTC3870EUFD#TRPBF remains non-functional; its design assumes tight coupling within a digital power system management framework.
What is the role of the ILIM pin on the LTC3870EUFD#TRPBF?
The ILIM pin on the LTC3870EUFD#TRPBF selects the current sense threshold range (45–55mV low range or 70–80mV high range) for both channels, using four logic states: GND (both low), 1/3INTVCC (CH0 high / CH1 low), 2/3INTVCC or float (CH0 low / CH1 high), and INTVCC (both high). This must match the MFR_PWM_MODE register setting in the master controller to ensure balanced current sharing and consistent overcurrent protection.
Does the LTC3870EUFD#TRPBF support DCR current sensing?
Yes, the LTC3870EUFD#TRPBF fully supports inductor DCR current sensing through its ISENSE0+/ISENSE0− and ISENSE1+/ISENSE1− pins, offering lossless sensing for high-efficiency, high-current applications. However, DCR tolerance (typically ±10%) necessitates careful layout and compensation; for precision current matching, a dedicated sense resistor (RSENSE) is recommended - and must be matched identically between master and slave channels.
LTC3870EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-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 ~ 60V
- Frequency - Switching:
- 500kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3870EUFD#TRPBF FAQ
1.How can I place an order for LTC3870EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3870EUFD#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 LTC3870EUFD#TRPBF reliable?
The price and inventory of LTC3870EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3870EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3870EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3870EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3870EUFD#TRPBF?
LTC3870EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3870EUFD#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 LTC3870EUFD#TRPBF?
For technical support, including LTC3870EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3870EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3870EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3870EUFD#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 LTC3870EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3870EUFD#TRPBF?
All LTC3870EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3870EUFD#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 LTC3870EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3870EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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