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Analog Devices Inc. LTC7151SJV-4#PBF
- Part No.:
- LTC7151SJV-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LTC7151SJV-4#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:980
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Product details
Overview
LTC7151SJV-4#PBF from Analog Devices is a 20V, 15A monolithic synchronous step-down Silent Switcher 2 regulator with programmable 400kHz–3MHz switching frequency, ±1% reference accuracy over –40°C to 150°C, differential remote sense, and AEC-Q100 Grade 0 qualification. It delivers high-efficiency power conversion for FPGA/ASIC point-of-load supplies in automotive and industrial systems.
For engineers reviewing the LTC7151SJV-4#PBF datasheet, LTC7151SJV-4#PBF pinout, LTC7151SJV-4#PBF application, or LTC7151SJV-4#PBF equivalent, key selection criteria include its 28-lead 4mm × 5mm LQFN package with exposed GND pads, 0.5V feedback reference, 16–20A valley current limit, and PolyPhase® support up to 12 phases for high-current distributed power architectures.
Technical Context
The LTC7151SJV-4#PBF implements a constant-frequency, controlled-on-time current-mode architecture with integrated top/bottom NMOS power switches (11mΩ/4mΩ typical RDS(ON)). Its second-generation Silent Switcher 2 design embeds bypass capacitors to minimize high-frequency loop area and EMI.
It supports forced continuous or discontinuous conduction mode via MODE/SYNC pin control, external synchronization from 400kHz to 3MHz with ±30% capture range, and phase-adjustable CLKOUT output (180°/120°/90°) for multi-phase interleaving. The device features differential VOUT– sensing, output tracking/soft-start via TRACK/SS, and VIN overvoltage protection at 24.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports wide-input industrial and automotive battery-supplied rails. |
| IOUT Max | 15A - delivers full rated load without derating at TJ ≤ 150°C per AEC-Q100 Grade 0. |
| fSW Range | 400kHz to 3MHz - enables compact magnetics and low-profile designs; RT resistor sets exact frequency. |
| VFB Accuracy | ±1% over –40°C to 150°C - ensures stable output regulation across full automotive temperature range. |
| Package | 28-Lead 4mm × 5mm LQFN - thermally enhanced with exposed GND pads (θJA = 31°C/W). |
| EMI Performance | Silent Switcher 2 architecture - integrated VIN/BOOST capacitors reduce PCB layout sensitivity and meet CISPR 22 Class B limits. |
| PolyPhase Support | Up to 12 phases - enables scalable high-current solutions with reduced input/output ripple and capacitor count. |
Pinout & Package
28-Lead (5mm × 4mm × 0.95mm) LQFN package with exposed GND pads (pins 29–32), RoHS-compliant Au finish, MSL Level 3. Exposed pads must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (1) | PolyPhase clock output | Provides phase-aligned clock signal for synchronizing multiple regulators; amplitude = INTVCC to GND. |
| RUN (2) | Enable control input | Logic-high >1.2V activates regulator; accurate threshold enables SVIN UVLO programming via resistor divider. |
| SVIN (3) | Signal input supply | Powers internal 3.3V LDO; requires 0.1µF ceramic bypass to minimize noise on bias rail. |
| PVIN (4,5,18,19) | Main power input | High-current VIN path for top/bottom MOSFETs; connect directly to low-ESR bulk input capacitors. |
| GND (6–8,15–17,29–32) | Power/signal ground | Thermally critical return path; exposed pads (29–32) must be soldered to PCB ground plane. |
| SW (9–14) | Switch node | Connects to external inductor; voltage swings from ~–0.3V to PVIN + 0.3V; requires tight layout to minimize EMI. |
| INTVCC (20) | Internal 3.3V supply | Output of integrated LDO; requires ≥4.7µF low-ESR ceramic capacitor to ground for gate driver stability. |
| MODE/SYNC (21) | Mode select & sync input | Tied to GND = DCM; floating or >1V = forced CCM; driven by external clock = synchronization + CCM. |
| VOUT– (22) | Negative output sense | Kelvin connection point for remote sensing; must tie directly to bottom of output capacitor near load. |
| FB (23) | Feedback input | Senses divided output voltage; regulates to 0.5V reference; supports 0.5V–5.5V VOUT range. |
| ITH (24) | Error amplifier output | Compensation node; sets valley current limit linearly (0.3V–1.8V); external R/C network required for stability. |
| TRACK/SS (25) | Tracking/soft-start | 6µA internal pull-up enables soft-start with external capacitor; 0–0.5V input overrides reference for tracking. |
| PGOOD (26) | Power good indicator | Open-drain output pulled low when FB deviates >±8% from 0.5V; requires external pull-up. |
| RT (27) | Frequency programming | Resistor to GND sets fSW: 162kΩ = 1MHz; formula f = 1.67×10¹¹/RT (Ω). |
| PHMODE (28) | Phase control input | INTVCC = 2-phase (180°), GND = 3-phase (120°), float/INTVCC/2 = 4-phase (90°). |
Key Features
| Feature | Design Value |
|---|---|
| Differential VOUT– sensing | Eliminates board trace IR drop error in high-current POL applications, enabling <±1% output accuracy at load. |
| AEC-Q100 Grade 0 qualification | Guaranteed operation from –40°C to +150°C junction temperature for under-hood automotive use. |
| Integrated Silent Switcher 2 capacitors | Reduces high-di/dt loop area internally, lowering radiated emissions without requiring complex PCB stackup. |
| Programmable minimum on-time (20ns) | Enables high step-down ratios (e.g., 12V→1V at 1MHz) while maintaining stable regulation and fast transient response. |
| External ITH compensation | OPTI-LOOP® architecture allows precise loop tuning for varied output capacitance and load conditions. |
Applications
| Automotive ADAS Power Supply | Industrial FPGA Core Rail |
|---|---|
Use Scenario: Powering vision processor SoCs in camera modules with strict EMI limits and wide ambient temperature swing. IC Role / Device Role / Timing Role: Primary 1.0V/12A POL regulator with differential sensing and Silent Switcher 2 EMI suppression. Use Value: Meets CISPR 25 Class 5 radiated emissions without shielding, enabling compact module design in constrained spaces. | Use Scenario: Delivering tightly regulated 1.2V core voltage to Xilinx Kintex FPGAs in factory automation controllers. IC Role / Device Role / Timing Role: High-current buck converter with tracking capability for sequencing with auxiliary rails. Use Value: ±1% reference accuracy and 15A capability ensure stable operation during logic reconfiguration transients. |
| Server VR13-Compatible Supply | Multi-Phase Telecom PSU |
Use Scenario: Secondary-side 3.3V/15A supply in enterprise SSD controller cards requiring VR13 compliance. IC Role / Device Role / Timing Role: Synchronous buck regulator with PGOOD signaling and remote sense for DDR memory subsystems. Use Value: Differential VOUT– sensing maintains <±10mV regulation at 15A despite PCB trace resistance. | Use Scenario: Scalable 48V-to-12V intermediate bus converter using four LTC7151SJV-4#PBF in 4-phase interleaved configuration. IC Role / Device Role / Timing Role: Phase-synchronized buck stage with CLKOUT/PHMODE coordination for ripple cancellation. Use Value: 12-phase support reduces input capacitor RMS current by >70%, extending capacitor lifetime in 24/7 telecom infrastructure. |
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 |
|---|---|---|---|
| LTC7151SEV#PBF | Same architecture and pinout, but rated for –40°C to 125°C junction temperature; no AEC-Q100 qualification. | Targeted at commercial/industrial applications without automotive reliability requirements. | Select when operating temperature does not exceed 125°C and automotive qualification is unnecessary. |
| MP2960GQ-10 | 10A rated, 4.5V–18V input, 12-pin QFN; lacks PolyPhase, differential sense, and Silent Switcher EMI optimization. | Suitable for cost-sensitive, lower-current applications where EMI is less critical. | Choose only if 10A output suffices and multi-phase scalability or automotive-grade operation is not required. |
Compared with LTC7151SEV#PBF and MP2960GQ-10, the LTC7151SJV-4#PBF uniquely combines AEC-Q100 Grade 0 qualification, 15A capability, differential remote sensing, and Silent Switcher 2 EMI performance-making it the sole option for high-reliability, high-current automotive and industrial POL designs demanding both precision and robustness.
Availability
LTC7151SJV-4#PBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial FPGA power supplies, and telecom intermediate bus converters requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC7151SJV-4#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 precision, industrial, automotive, and communications markets.
The LTC7151S product line delivers high-current, low-EMI synchronous buck regulation for demanding point-of-load applications where thermal efficiency, reliability, and electromagnetic compatibility are critical design constraints.
FAQ
What is the maximum junction temperature specification for the LTC7151SJV-4#PBF?
The LTC7151SJV-4#PBF is qualified to AEC-Q100 Grade 0 with guaranteed operation from –40°C to +150°C junction temperature. This rating is explicitly confirmed in the Absolute Maximum Ratings table and Order Information section of the Rev. E datasheet, where "LTC7151SJ-4" denotes the –40°C to 150°C grade. Thermal design must maintain TJ ≤ 150°C under worst-case load and ambient conditions.
Does the LTC7151SJV-4#PBF support differential remote sensing, and how is it implemented?
Yes, the LTC7151SJV-4#PBF supports differential remote sensing via dedicated VOUT– (pin 22) and FB (pin 23) connections. VOUT– must be connected directly to the negative terminal of the output capacitor at the load, while FB senses the resistive divider output. This Kelvin configuration cancels voltage drop across PCB traces, ensuring ±1% output accuracy at the load point-even at 15A-without requiring additional compensation.
How is the switching frequency programmed on the LTC7151SJV-4#PBF?
The switching frequency of the LTC7151SJV-4#PBF is set by an external resistor (RT) connected from pin 27 to GND. Using the formula fSW = 1.67×10¹¹ / RT(Ω), a 162kΩ resistor yields 1.0MHz (typical). Frequency range is 400kHz to 3MHz, corresponding to RT values from 405kΩ down to 54kΩ. The device also accepts external synchronization on MODE/SYNC within ±30% of the RT-set frequency.
What is the purpose of the PHMODE pin on the LTC7151SJV-4#PBF, and how does it affect PolyPhase operation?
The PHMODE pin (pin 28) controls the phase offset between the internal oscillator and CLKOUT signal. Tying PHMODE to INTVCC configures 2-phase (180°), to GND configures 3-phase (120°), and floating or to INTVCC/2 configures 4-phase (90°) operation. This enables precise interleaving of multiple LTC7151SJV-4#PBF regulators-up to 12 total phases-to reduce input/output ripple and capacitor stress in high-current systems.
Is external compensation required for the LTC7151SJV-4#PBF, and where is it applied?
Yes, external compensation is mandatory and applied at the ITH pin (pin 24). The device uses OPTI-LOOP® architecture requiring an RITH/CITH/CITHP network (e.g., 10kΩ/1nF/22pF at 1MHz) to stabilize the current-mode control loop. Table 1 in the datasheet provides recommended values per switching frequency. Omitting this network results in instability, poor transient response, or oscillation-no internal compensation is provided.
LTC7151SJV-4#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:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (5x4)
LTC7151SJV-4#PBF FAQ
1.How can I place an order for LTC7151SJV-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7151SJV-4#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 LTC7151SJV-4#PBF reliable?
The price and inventory of LTC7151SJV-4#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7151SJV-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC7151SJV-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7151SJV-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7151SJV-4#PBF?
LTC7151SJV-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7151SJV-4#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 LTC7151SJV-4#PBF?
For technical support, including LTC7151SJV-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7151SJV-4#PBF requirements.
6.How does Aetrix verify that LTC7151SJV-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7151SJV-4#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 LTC7151SJV-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC7151SJV-4#PBF?
All LTC7151SJV-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7151SJV-4#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 LTC7151SJV-4#PBF part is unused and in its original packaging.
Return procedure for LTC7151SJV-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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