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Analog Devices Inc. LTC7151SEV#PBF
- Part No.:
- LTC7151SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LTC7151SEV#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,531
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Product details
Overview
LTC7151SEV#PBF from Analog Devices is a 20V, 15A monolithic synchronous step-down Silent Switcher 2 regulator with constant-frequency current-mode control, 0.5V–5.5V output range, ±1% reference accuracy over –40°C to 125°C, and integrated bypass capacitors for low-EMI operation - used in high-density point-of-load supplies for FPGAs and ASICs.
For engineers reviewing the LTC7151SEV#PBF datasheet, LTC7151SEV#PBF pinout, LTC7151SEV#PBF application, or LTC7151SEV#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed PolyPhase® interoperability up to 12 phases, differential remote sensing capability, and real-world efficiency vs. load/frequency trade-offs at 1MHz/15A.
Technical Context
The LTC7151SEV#PBF implements a controlled-on-time, constant-frequency current-mode architecture with internal top/bottom NMOS power switches (11mΩ/4mΩ typical RDS(ON)), programmable switching frequency (400kHz–3MHz via RT resistor), and phase-lockable PolyPhase® operation supporting up to 12 synchronized regulators. It features dual-input VIN architecture (PVIN/SVIN), differential VOUT– sensing, and OPTI-LOOP® external compensation at the ITH node.
Its Silent Switcher 2 design integrates input and BOOST bypass capacitors to minimize high-di/dt loop area, enabling <90% efficiency at 15A/1V out while meeting CISPR 32 Class B EMI limits without shielding. The device supports forced continuous or discontinuous conduction mode via MODE/SYNC pin and includes VIN overvoltage protection (24.5V trip) and accurate RUN threshold (1.20V ±100mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V PVIN; SVIN supports 3.1V–5.5V for internal LDO - enables wide-input industrial/server rails with separate signal/power path isolation. |
| IOUT Max | 15A continuous - delivered via thermally enhanced 4mm × 5mm LQFN package with exposed GND pad (θJA = 31°C/W). |
| VOUT Range | 0.5V to 5.5V, set by FB resistor divider - supports core voltages for modern ASICs, FPGAs, and µPs with ±1% reference accuracy over full temperature range. |
| fSW | 400kHz to 3MHz, resistor-programmable (RT pin) - allows optimization of inductor size, efficiency, and transient response; supports external sync within ±30% window. |
| EMI Performance | Silent Switcher 2 with integrated VIN/BOOST caps - reduces PCB layout sensitivity and eliminates need for external EMI filters in most Class B applications. |
| Protection Features | VIN OV (24.5V trip), PGOOD with ±8% window, thermal shutdown, and valley current limit (16–20A) - ensures robust operation under fault conditions without external circuitry. |
| Operating Temp | –40°C to +125°C junction (LTC7151SE grade) - qualified for industrial and extended-temperature embedded systems. |
Pinout & Package
Package: 28-lead 4mm × 5mm × 0.74mm thermally enhanced LQFN with exposed GND pads (pins 29–32). θJA = 31°C/W, θJC(PAD) = 6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (1) | PolyPhase clock output | Drives MODE/SYNC of downstream LTC7151S; phase offset set by PHMODE (180°/120°/90° for 2/3/4-phase). |
| RUN (2) | Enable control input | Logic-high >1.20V activates regulator; accurate threshold enables precise SVIN UVLO programming via resistor divider. |
| SVIN (3) | Signal input voltage | Powers internal 3.3V LDO (INTVCC); requires local 0.1µF ceramic bypass - isolates noise-sensitive bias from power path. |
| PVIN (4,5,18,19) | Main power input | Connects directly to high-current input rail; multiple pins reduce IR drop and improve thermal spreading. |
| GND (6–8,15–17,29–32) | Power/signal ground | Exposed thermal pad (29–32) must be soldered to PCB plane for thermal performance and EMI reduction. |
| SW (9–14) | Switch node | High-di/dt connection to external inductor; six parallel pins minimize trace inductance and ringing. |
| INTVCC (20) | Internal 3.3V supply | Must be decoupled with ≥4.7µF low-ESR ceramic cap - supplies gate drivers and control logic; sensitive to layout. |
| MODE/SYNC (21) | DCM select / external sync | Tie to GND for DCM; float or tie >1V for forced CCM; apply external clock for synchronization (±30% capture range). |
| VOUT– (22) | Negative output sense | Kelvin connection to remote load ground - enables differential sensing to cancel PCB IR drop error. |
| FB (23) | Feedback input | Compares resistive divider output against 0.5V reference; supports 0.5V–5.5V VOUT with ±1% accuracy. |
| ITH (24) | Error amplifier output | OPTI-LOOP® compensation node; sets valley current limit linearly (0.3V–1.8V → 7A–20A); requires external R/C network. |
| TRACK/SS (25) | Soft-start / tracking | 6µA internal pull-up enables soft-start with capacitor; 0–0.5V input overrides reference for precise output tracking. |
| PGOOD (26) | Power-good indicator | Open-drain output pulled low if VFB deviates >±8% from 0.5V - signals valid regulation to system controller. |
| RT (27) | Frequency programming | Resistor to GND sets fSW: 162kΩ = 1MHz; formula f = 1.67×10¹¹/RT (Ω) - enables compact magnetics selection. |
| PHMODE (28) | Phase control input | INTVCC = 2-phase (180°), GND = 3-phase (120°), float = 4-phase (90°) - enables scalable multi-phase designs up to 12 phases. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated VIN and BOOST ceramic capacitors minimize high-frequency loop area, enabling >90% efficiency at 1MHz/15A with no EMI shielding required. |
| Differential Remote Sensing | VOUT– pin enables Kelvin connection to load ground, eliminating PCB trace IR drop error - critical for sub-1V FPGA core supplies. |
| PolyPhase® Scalability | CLKOUT and PHMODE support up to 12-phase interleaving; reduces input/output ripple current by √N and allows smaller bulk capacitors. |
| OPTI-LOOP® Compensation | ITH pin provides direct access to error amplifier output for precision loop tuning - supports stable operation across wide VOUT/IOUT/fSW ranges. |
| Accurate RUN Threshold | 1.20V ±100mV rising threshold enables reliable sequencing and programmable SVIN UVLO using simple resistor dividers. |
| VIN Overvoltage Protection | 24.5V PVIN trip with 3V hysteresis suspends switching without latch-off - protects internal 20V-rated MOSFETs during transients. |
Applications
| Server Point-of-Load Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Delivering 1.0V/15A to high-performance server CPUs with tight transient requirements and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with differential sensing, PolyPhase® scalability, and Silent Switcher 2 EMI suppression. Use Value: Achieves >92% efficiency at 1MHz/15A while meeting CISPR 32 Class B without ferrite beads or metal shields - reducing BOM cost and board area. |
Use Scenario: Powering Xilinx UltraScale+ or Intel Stratix 10 FPGA cores requiring sub-1% output accuracy and fast load-step response. IC Role / Device Role / Timing Role: High-accuracy, low-noise DC/DC converter with ±1% VREF, 20ns min on-time, and OPTI-LOOP® compensation. Use Value: Maintains 10mV output deviation during 0→15A 1µs load steps - avoids FPGA configuration errors and timing violations. |
| Industrial PLC Power Module | Automotive ADAS Domain Controller |
Use Scenario: Generating 3.3V/10A for industrial programmable logic controllers operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust buck regulator with AEC-Q100-compatible variant (LTC7151SJ-4), wide VIN, and thermal shutdown. Use Value: Sustains full 15A output at 125°C junction temperature using standard 2oz copper PCB - eliminates derating in enclosed enclosures. |
Use Scenario: Supplying 1.8V/8A to radar SoCs in automotive domain controllers with stringent functional safety and EMI requirements. IC Role / Device Role / Timing Role: Safety-aware power stage with PGOOD monitoring, VIN OV protection, and Silent Switcher 2 low-radiated emissions. Use Value: Passes ISO 11452-2/4 radiated immunity testing at 10V/m without layout modifications - accelerates automotive qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPM3695-25 from Monolithic Power Systems | 18V/25A, 2.5mm × 3.5mm QFN, fixed 750kHz fSW, no PolyPhase® sync, lower max VIN | Targeted at space-constrained consumer electronics; lacks differential sensing and external frequency programming. | Choose when board area is primary constraint and EMI filtering is acceptable; not suitable for multi-phase or high-precision tracking. |
| TPS546D24A from Texas Instruments | 18V/60A dual-phase controller, external FETs, PMBus interface, 400kHz–2MHz fSW, no integrated caps | Requires external power stage and more complex layout; supports telemetry and digital configuration. | Choose for ultra-high-current (>30A) or digitally managed systems where flexibility outweighs integration benefits. |
Compared with MPM3695-25, LTC7151SEV#PBF offers superior EMI performance and design flexibility via Silent Switcher 2 and PolyPhase®; compared with TPS546D24A, it delivers higher integration and simpler layout at the cost of digital configurability - making LTC7151SEV#PBF optimal for analog-controlled, high-density industrial and server POLs.
Availability
LTC7151SEV#PBF is available at Aetrix Electronics and suitable for server power applications, FPGA point-of-load supplies, and industrial PLC modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC7151SEV#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7151S product line delivers high-efficiency, low-EMI monolithic buck regulators for demanding point-of-load applications in servers, data centers, and high-reliability embedded systems - designed to replace discrete power stages with simplified, validated solutions.
FAQ
What is the maximum output current supported by the LTC7151SEV#PBF?
The LTC7151SEV#PBF is rated for continuous 15A output current under specified thermal conditions (TJ ≤ 125°C) using the 4mm × 5mm LQFN package with proper PCB copper pour and airflow. Its valley current limit is programmable from 16A to 20A via the ITH pin voltage, and it supports PolyPhase® operation to scale beyond 15A using multiple LTC7151SEV#PBF units.
Does the LTC7151SEV#PBF require external compensation components?
Yes, the LTC7151SEV#PBF mandates external OPTI-LOOP® compensation at the ITH pin using an R-C network (e.g., 10kΩ + 1nF + 22pF for 1MHz operation). This network stabilizes the current-mode control loop, optimizes transient response, and prevents oscillation - skipping or mis-sizing these components will cause instability or poor load regulation.
How does the Silent Switcher 2 architecture in the LTC7151SEV#PBF reduce EMI?
The LTC7151SEV#PBF integrates ceramic bypass capacitors directly into the package for both VIN and BOOST nodes, minimizing high-di/dt loop area. Combined with symmetrical pin layout and balanced internal power paths, this reduces magnetic field radiation by >20dB compared to first-generation Silent Switcher devices - enabling compliance with CISPR 32 Class B without added shielding or filtering.
Can the LTC7151SEV#PBF operate with input voltages below 3.1V?
No, the LTC7151SEV#PBF has a minimum specified PVIN and SVIN operating voltage of 3.1V per the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold is not guaranteed, may result in improper startup or regulation failure, and falls outside the validated design envelope for the LTC7151SEV#PBF.
What is the purpose of the VOUT– pin on the LTC7151SEV#PBF?
The VOUT– pin on the LTC7151SEV#PBF provides a dedicated Kelvin return path for differential output voltage sensing. It must be connected directly to the negative terminal of the output capacitor near the load to eliminate PCB trace resistance error - ensuring accurate regulation of low-voltage outputs (e.g., 1.0V) despite IR drops in high-current paths.
LTC7151SEV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (5x4)
LTC7151SEV#PBF FAQ
1.How can I place an order for LTC7151SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7151SEV#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 LTC7151SEV#PBF reliable?
The price and inventory of LTC7151SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7151SEV#PBF is usually 5 days.
3.What payment methods are accepted for LTC7151SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7151SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7151SEV#PBF?
LTC7151SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7151SEV#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 LTC7151SEV#PBF?
For technical support, including LTC7151SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7151SEV#PBF requirements.
6.How does Aetrix verify that LTC7151SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7151SEV#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 LTC7151SEV#PBF meets industry standards.
7.What is the process for return or replacement of LTC7151SEV#PBF?
All LTC7151SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7151SEV#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 LTC7151SEV#PBF part is unused and in its original packaging.
Return procedure for LTC7151SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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