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Analog Devices Inc. LTC3415EUHF#PBF
- Part No.:
- LTC3415EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3415EUHF#PBF.pdf
- Description:
- IC REG BUCK ADJ 7A 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
LTC3415EUHF#PBF from Analog Devices (formerly Linear Technology) is a monolithic, phase-lockable, current-mode synchronous step-down regulator delivering up to 7A output current with 96% peak efficiency. It operates from 2.5V–5.5V input, supports PolyPhase® operation up to 12 phases, and features 1.5MHz nominal switching frequency with external synchronization from 0.75MHz to 2.25MHz. It serves as a high-density point-of-load power supply for battery-powered portable instruments and distributed power systems.
For engineers reviewing the LTC3415EUHF#PBF datasheet, LTC3415EUHF#PBF pinout, LTC3415EUHF#PBF application, or LTC3415EUHF#PBF equivalent, key selection criteria include its 7A output capability at 3V input, ±1% reference accuracy, 100% duty cycle low-dropout mode, selectable Burst Mode®/pulse-skip/forced-continuous operation, and precise current sharing across PolyPhase configurations.
Technical Context
The LTC3415EUHF#PBF implements a constant-frequency, current-mode control architecture with internal P-channel and N-channel MOSFETs (RDS(ON) = 32mΩ / 25mΩ). Its error amplifier drives the ITH node to regulate inductor peak current, while the PLL synchronizes switching to an external CLKIN signal with programmable phase offset via PHMODE.
PolyPhase® operation relies on differential ITH/ITHM signaling for accurate current sharing across multiple ICs, and spread-spectrum modulation is enabled by connecting CLKIN to SVIN. The device supports output voltage tracking, margining (±3% to ±17%), and robust protection including overvoltage (±7% to ±13%), undervoltage, short-circuit, and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 7A max at VIN = 3V - enables single-chip high-current PoL without external FETs |
| Input Voltage Range | 2.5V to 5.5V - supports single Li-ion battery and standard 3.3V/5V rails |
| Switching Frequency | 1.5MHz nominal, syncable 0.75–2.25MHz - allows compact 0.2μH inductors and noise-sensitive system timing |
| Reference Accuracy | ±1% over temperature - ensures tight output regulation without external trimming |
| Efficiency | Up to 96% at full load - minimizes thermal stress and extends battery runtime |
| Quiescent Current | 450μA in Burst Mode - sustains ultra-low-power standby in portable equipment |
| Duty Cycle | 100% - maintains regulation down to VOUT ≈ VIN, critical for battery discharge end-of-life |
Pinout & Package
Package: 38-pin (5mm × 7mm) QFN with exposed PGND pad (Pin 39), rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (4,5,27,28,35,36) | Power Input Supply | High-current path to internal PMOS/NMOS switches; requires local ceramic decoupling to PGND |
| SW (6,7,8,9,23,24,25,26) | Switch Node | Drives external inductor; swings between PVIN and PGND; multiple pins reduce parasitic inductance |
| PGND (13–19,39) | Power Ground | Return path for NMOS source and input/output capacitors; exposed pad must be soldered for thermal and electrical performance |
| VFB (29) | Feedback Input | Compares output voltage divider to 0.596V internal reference; enables master/slave PolyPhase configuration when tied to SVIN |
| ITH (32) | Error Amplifier Output | Controls peak inductor current threshold; supports internal compensation (tie to SVIN) or OPTI-LOOP® external compensation |
| PHMODE (12) | Phase Offset Control | Selects 180° (2-phase), 120° (3-phase), or 90° (4-phase) CLKOUT phase shift relative to CLKIN for multiphase synchronization |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® Operation | Enables up to 12 synchronized regulators with automatic current sharing via differential ITH/ITHM signaling |
| Spread Spectrum Modulation | Reduces EMI peaks by modulating switching frequency when CLKIN is tied to SVIN |
| Output Tracking & Margining | Supports precise power-rail sequencing (TRACK pin) and ±3% to ±17% output voltage adjustment (MGN/BSEL pins) |
| Burst Mode® Efficiency | Maintains >85% efficiency at 10mA load with only 450μA quiescent current |
| Low Dropout Operation | 100% duty cycle extends usable battery life by regulating down to VOUT ≈ VIN |
Applications
| Point of Load Power Supply | Portable Instruments |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/1.8V/3.3V rails to FPGA, ASIC, or DSP cores in embedded computing modules. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 7A with fast transient response and ±1% output accuracy. Use Value: Eliminates need for external power stages while supporting dynamic voltage scaling and low-noise operation via selectable PWM modes. | Use Scenario: Powering handheld test equipment (e.g., DMMs, oscilloscope probes) operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down converter maintaining stable output during battery discharge from 4.2V to 2.7V. Use Value: 100% duty cycle and Burst Mode® extend operational time by >30% compared to fixed-frequency alternatives at light loads. |
| Distributed Power Systems | Battery-Powered Equipment |
Use Scenario: Building scalable 14A–84A power supplies using 2–12 LTC3415EUHF#PBF units in PolyPhase® configuration. IC Role / Device Role / Timing Role: Synchronized multiphase controller with programmable phase offset and matched current sharing. Use Value: Reduces input/output RMS ripple current by factor of √N and effective ripple frequency by factor of N, slashing capacitor count and size. | Use Scenario: Supplying processor, memory, and peripheral rails in ruggedized industrial tablets and mobile data terminals. IC Role / Device Role / Timing Role: Robust DC/DC regulator with integrated OVP/UVP, thermal shutdown, and 125°C junction-rated QFN package. Use Value: Ensures reliable operation across –40°C to +85°C without derating, supported by ±10% PGOOD monitoring and margining for production testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3883IUHF#PBF | Digitally controlled dual-output controller (no integrated FETs); supports PMBus; 600kHz–1.2MHz range | Requires external power stage; suited for systems needing telemetry, fault logging, and multi-rail coordination | Choose when digital configurability, rail sequencing, and real-time telemetry outweigh integrated-FET convenience |
| MP8770GQ-Z | Monolithic 8A buck (RDS(ON) = 12mΩ/7mΩ); 500kHz–3MHz sync range; no PolyPhase® or margining | Lacks multiphase synchronization, output tracking, and precision margining; higher peak efficiency but less feature-rich | Choose for cost-sensitive, high-current single-phase designs where advanced control features are unnecessary |
Compared with LTC3415EUHF#PBF, LTC3883IUHF#PBF trades integration for digital control flexibility, while MP8770GQ-Z offers higher current and lower RDS(ON) but omits PolyPhase®, margining, and tracking-making LTC3415EUHF#PBF optimal for analog-controlled, multi-rail, or multiphase PoL systems requiring precision and scalability.
Availability
LTC3415EUHF#PBF is available at Aetrix Electronics and suitable for point-of-load power supply, portable instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3415EUHF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3415EUHF#PBF belongs to Linear's high-current monolithic DC/DC regulator product line, engineered specifically for space-constrained, high-efficiency point-of-load applications demanding multiphase scalability, precision regulation, and robust protection.
FAQ
What is the maximum output current capability of the LTC3415EUHF#PBF?
The LTC3415EUHF#PBF delivers up to 7A continuous output current when VIN = 3V, with thermal performance validated in the 5mm × 7mm QFN package at –40°C to +85°C ambient. Peak current limit is factory-trimmed to 13A typical, and output current scales with input voltage and PCB thermal design-e.g., 6A is sustainable at VIN = 2.5V with adequate copper area and airflow. Derating curves are provided in Figure G06 of the LTC3415EUHF#PBF datasheet.
Does the LTC3415EUHF#PBF support synchronization to an external clock source?
Yes, the LTC3415EUHF#PBF supports external synchronization via the CLKIN pin, accepting frequencies from 0.75MHz to 2.25MHz. When synchronized, the internal PLL locks both frequency and phase to the external clock edge. The PHMODE pin further controls CLKOUT phase offset (180°, 120°, or 90°) for multiphase cascading. During sync, Burst Mode® is automatically disabled to maintain deterministic timing, as documented in the "Burst Mode Operation" section of the LTC3415EUHF#PBF datasheet.
How does the LTC3415EUHF#PBF achieve accurate current sharing in PolyPhase® configurations?
The LTC3415EUHF#PBF achieves accurate current sharing through factory-trimmed current sense comparators and differential ITH/ITHM signaling. In master-slave setups, the master's ITH voltage is shared across all slaves via their ITH pins, while ITHM pins are tied together and connected to a single SGND point to reject ground offset errors. This architecture ensures ≤5% current mismatch across up to 12 phases under matched layout and thermal conditions, as verified in Application Note 19 and Figure 2d–2e of the LTC3415EUHF#PBF datasheet.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous operation on the LTC3415EUHF#PBF?
Burst Mode® (MODE = VIN) maximizes light-load efficiency by gating switching cycles, achieving 450μA IQ and >85% efficiency at 10mA. Pulse-skipping (MODE = VIN/2) skips cycles in DCM to reduce ripple while maintaining moderate efficiency. Forced continuous (MODE = GND) ensures fixed-frequency PWM with lowest output ripple but higher IQ (~1.35mA). All three modes are hardware-selectable and mutually exclusive-selection directly impacts thermal performance, EMI profile, and transient response, as detailed in the "OPERATION" section of the LTC3415EUHF#PBF datasheet.
Can the LTC3415EUHF#PBF operate with a 2.5V input supply?
Yes, the LTC3415EUHF#PBF is fully specified to operate from 2.5V to 5.5V input. At VIN = 2.5V, it sustains 7A output with VOUT ≥ 0.6V (per absolute minimum VFB), and 100% duty cycle enables regulation down to VOUT ≈ VIN. Startup is guaranteed above the 2.05V UVLO threshold, and efficiency remains >90% at 3.3V→1.8V conversion. Performance curves for 2.5V operation are shown in Figures G01, G02, and G09 of the LTC3415EUHF#PBF datasheet.
LTC3415EUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.375V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 7A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3415EUHF#PBF FAQ
1.How can I place an order for LTC3415EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3415EUHF#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 LTC3415EUHF#PBF reliable?
The price and inventory of LTC3415EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3415EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3415EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3415EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3415EUHF#PBF?
LTC3415EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3415EUHF#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 LTC3415EUHF#PBF?
For technical support, including LTC3415EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3415EUHF#PBF requirements.
6.How does Aetrix verify that LTC3415EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3415EUHF#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 LTC3415EUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3415EUHF#PBF?
All LTC3415EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3415EUHF#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 LTC3415EUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3415EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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