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Analog Devices Inc. LTC7151SIV#PBF
- Part No.:
- LTC7151SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LTC7151SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
LTC7151SIV#PBF from Analog Devices is a 20V, 15A monolithic synchronous step-down Silent Switcher 2 regulator with current-mode control, 400kHz–3MHz programmable switching frequency, ±1% reference accuracy over –40°C to 150°C, and AEC-Q100 Grade 0 qualification. It delivers high-efficiency power conversion for automotive point-of-load applications requiring low EMI and fast transient response.
For engineers reviewing the LTC7151SIV#PBF datasheet, LTC7151SIV#PBF pinout, LTC7151SIV#PBF application, or LTC7151SIV#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world application constraints - all derived from the official Rev. E datasheet and Analog Devices' automotive-grade product documentation.
Technical Context
The LTC7151SIV#PBF implements a constant-frequency, controlled-on-time current-mode architecture with integrated top/bottom NMOS power switches (11mΩ/4mΩ typical RDS(ON)). Its dual-input design separates PVIN (power path) and SVIN (signal/LDO input), enabling robust operation across 3.1V–20V input while maintaining stable 3.3V INTVCC regulation.
It supports PolyPhase® operation up to 12 phases via CLKOUT synchronization and PHMODE-configurable phase offsets (90°/120°/180°), and features differential remote sensing (VOUT–), adjustable soft-start/tracking via TRACK/SS, and VIN overvoltage protection (24.5V trip). The device operates in forced continuous or discontinuous mode under MODE/SYNC control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - Supports wide automotive battery range including cold-crank (≥3.1V) and load-dump transients (≤20V). |
| Output Current | 15A continuous - Delivers full rated load without derating at TJ ≤ 125°C in thermally optimized layouts. |
| Switching Frequency | 400kHz to 3MHz - Programmable via RT resistor; enables compact magnetics and noise-sensitive system coexistence. |
| Reference Accuracy | ±1% over –40°C to 150°C - Ensures tight output regulation across full automotive temperature range. |
| RDS(ON) | Top: 11mΩ, Bottom: 4mΩ at INTVCC = 3.3V - Minimizes conduction loss and improves efficiency at high load currents. |
| EMI Performance | Silent Switcher 2 with integrated bypass capacitors - Meets CISPR 25 Class 5 peak limits without shielding or ferrites. |
| Thermal Rating | AEC-Q100 Grade 0 (–40°C to +150°C junction) - Validated for under-hood automotive environments. |
Pinout & Package
28-lead thermally enhanced 4mm × 5mm LQFN package (0.74mm height) with exposed GND pads (pins 29–32) soldered to PCB for optimal thermal performance (θJA = 31°C/W, θJC(PAD) = 6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (1) | PolyPhase clock output | Drives external SYNC pins; phase offset set by PHMODE; amplitude = INTVCC to GND. |
| RUN (2) | Enable control input | Logic-high ≥1.2V activates regulator; accurate threshold enables SVIN UVLO programming. |
| SVIN (3) | Signal input for INTVCC LDO | Supplies internal 3.3V bias rail; requires 0.1µF ceramic bypass; decoupled from noisy PVIN. |
| PVIN (4,5,18,19) | Main power input | Connects to high-current input source; multiple pins reduce IR drop and improve thermal spreading. |
| GND (6–8,15–17,29–32) | Power and signal ground | Exposed pad (29–32) must be soldered to PCB thermal plane for thermal management. |
| SW (9–14) | Switch node | Connects to external inductor; handles full switching voltage swing (GND to PVIN + VF). |
| INTVCC (20) | Internal 3.3V supply output | Must be decoupled with ≥4.7µF low-ESR ceramic capacitor to support gate driver transients. |
| MODE/SYNC (21) | Mode select & sync input | GND = DCM; floating or >1V = forced CCM; external clock = synchronization + CCM. |
| VOUT– (22) | Negative remote sense | Direct Kelvin connection to load return minimizes trace IR error in high-current POL systems. |
| FB (23) | Feedback input | Senses resistive divider ratio; regulates VOUT = 0.5V × (1 + RFB1/RFB2) from 0.5V to 5.5V. |
| ITH (24) | Error amplifier output & compensation | Controls valley current limit; external R/C network required for OPTI-LOOP® stability. |
| TRACK/SS (25) | Soft-start & tracking input | 6µA internal pull-up enables soft-start with capacitor; 0–0.5V input overrides reference for sequencing. |
| PGOOD (26) | Open-drain power-good flag | Pulled low when FB deviates >±8% from 0.5V; requires external pull-up for logic-level interface. |
| RT (27) | Frequency programming | Resistor to GND sets fSW = 1.67×10¹¹/RT; 54kΩ–405kΩ yields 400kHz–3MHz. |
| PHMODE (28) | Phase configuration | INTVCC = 2-phase (180°), GND = 3-phase (120°), float/INTVCC/2 = 4-phase (90°). |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN/BOOST bypass capacitors minimize AC loop area, achieving <10mVp-p EMI emissions at 100MHz without shielding. |
| Differential remote sensing (VOUT–) | Eliminates board trace IR error in high-current (>10A) point-of-load designs, enabling ±0.5% output accuracy at load. |
| PolyPhase® scalability | Up to 12 synchronized phases using CLKOUT-to-MODE/SYNC daisy-chain and PHMODE-selectable offsets. |
| Automotive-grade reliability | AEC-Q100 Grade 0 qualified with 150°C max junction rating, 260°C reflow compatibility, and production lot traceability. |
| Flexible mode control | Pin-selectable forced CCM or DCM operation ensures optimal efficiency across light-to-full load conditions. |
Applications
| Automotive ADAS Camera Module | Industrial PLC I/O Power Rail |
|---|---|
|
Use Scenario: Powering 1.0V/15A core supply for high-resolution image sensor SoC in rear-view camera under hood-adjacent mounting. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise 1V rail with fast load-step response to handle burst-mode imaging. Use Value: Silent Switcher 2 EMI performance avoids interference with 5GHz Wi-Fi/Bluetooth coexistence; AEC-Q100 Grade 0 ensures operation at 125°C ambient. |
Use Scenario: Generating isolated 3.3V/12A auxiliary rail for digital I/O modules in factory automation controllers exposed to 85°C ambient. IC Role / Device Role / Timing Role: High-current POL converter with differential sensing to maintain regulation despite 50mΩ PCB trace resistance between IC and connector. Use Value: VOUT– sensing and ±1% reference accuracy guarantee <±15mV output deviation across temperature and line/load; thermal robustness prevents derating. |
| Server ASIC Core Supply | Medical Imaging FPGA Bias |
|
Use Scenario: 1.2V/15A core supply for AI accelerator ASIC in edge server with strict 2MHz switching constraint to avoid PCIe Gen5 band. IC Role / Device Role / Timing Role: Synchronized multi-phase buck controller operating at precisely 2MHz via RT resistor and external clock lock. Use Value: Programmable 400kHz–3MHz frequency enables exact 2MHz operation; PolyPhase reduces input/output capacitance by >40% vs single-phase. |
Use Scenario: Sequenced 1.8V/10A supply for radiation-tolerant FPGA in portable ultrasound unit requiring soft-start and power-good signaling. IC Role / Device Role / Timing Role: Regulator with TRACK/SS-controlled ramp and open-drain PGOOD for safe FPGA configuration handshaking. Use Value: Internal 6µA TRACK/SS pull-up enables precise soft-start timing (TSS = 83333 × C); PGOOD delay of 6–25 cycles ensures reliable reset assertion. |
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, 2.5MHz max, no differential sensing, non-AEC-Q100, smaller 4mm × 5mm QFN but no exposed thermal pad. | Higher current but lacks VOUT– sensing and automotive qualification; suited for industrial compute, not safety-critical automotive. | Select only if >15A headroom is required and AEC-Q100 compliance is unnecessary. |
| TPS546D24A from Texas Instruments | 18V/60A dual-phase, PMBus interface, 0.5% ref accuracy, no Silent Switcher EMI advantage, larger 6mm × 6mm package. | Supports digital telemetry and dynamic voltage scaling but adds firmware complexity; higher cost and board area. | Choose when telemetry, adaptive voltage scaling, or >15A per rail is mandatory - not for cost- or EMI-constrained designs. |
Compared with MPM3695-25 and TPS546D24A, the LTC7151SIV#PBF uniquely combines AEC-Q100 Grade 0 qualification, differential remote sensing, and Silent Switcher 2 EMI performance in a thermally optimized 4mm × 5mm LQFN - making it the only choice for automotive ADAS and industrial high-reliability POL where precision, noise immunity, and thermal resilience are co-required.
Availability
LTC7151SIV#PBF is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC I/O power rails, and medical imaging FPGA bias supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7151SIV#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 since 1965.
The LTC7151SIV#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators, engineered specifically for automotive and industrial applications demanding ultra-low EMI, high current density, and extended temperature reliability.
FAQ
What is the maximum junction temperature specification for the LTC7151SIV#PBF?
The LTC7151SIV#PBF is qualified to AEC-Q100 Grade 0 with a guaranteed operating junction temperature range of –40°C to +150°C. This rating is validated per the datasheet's absolute maximum ratings table and thermal characterization data (LTC7151SJ-4 variant), confirming suitability for under-hood automotive environments where ambient temperatures exceed 105°C.
Does the LTC7151SIV#PBF support differential remote sensing, and how is it implemented?
Yes, the LTC7151SIV#PBF supports differential remote sensing via dedicated VOUT– (pin 22) and FB (pin 23) inputs. VOUT– must be connected directly to the negative terminal of the output capacitor at the load to eliminate PCB trace IR error. When used with the standard feedback divider, this configuration maintains ±0.5% output accuracy across load and temperature - a critical capability for high-current point-of-load applications.
How is the switching frequency programmed on the LTC7151SIV#PBF?
The LTC7151SIV#PBF switching frequency is programmed using an external resistor (RT) connected from pin 27 to GND. The relationship is fSW = 1.67×10¹¹ / RT, yielding 400kHz at 405kΩ and 3MHz at 54kΩ. The device also supports external synchronization via the MODE/SYNC pin within ±30% of the RT-set frequency, enabling precise multi-phase alignment without frequency drift.
What is the purpose of the PHMODE pin on the LTC7151SIV#PBF, and how does it affect PolyPhase operation?
The PHMODE pin (pin 28) configures the phase offset between the internal oscillator and CLKOUT signal: tied to INTVCC = 180° (2-phase), GND = 120° (3-phase), or floated/INTVCC/2 = 90° (4-phase). This enables deterministic out-of-phase operation across up to 12 LTC7151SIV#PBF devices in a daisy-chained PolyPhase system, reducing input/output ripple and capacitor stress without external timing components.
Is external compensation required for the LTC7151SIV#PBF, and what is its role?
Yes, external compensation at the ITH pin (24) is mandatory for stable operation of the LTC7151SIV#PBF. The ITH network (RITH, CITH, CITHP) sets the current-loop bandwidth and phase margin. Per the datasheet's Table 1, values scale with switching frequency - e.g., 10kΩ/1nF/22pF at 1MHz - ensuring OPTI-LOOP®-optimized transient response and loop stability across varying output capacitance and load conditions.
LTC7151SIV#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (5x4)
LTC7151SIV#PBF FAQ
1.How can I place an order for LTC7151SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7151SIV#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 LTC7151SIV#PBF reliable?
The price and inventory of LTC7151SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7151SIV#PBF is usually 5 days.
3.What payment methods are accepted for LTC7151SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7151SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7151SIV#PBF?
LTC7151SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7151SIV#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 LTC7151SIV#PBF?
For technical support, including LTC7151SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7151SIV#PBF requirements.
6.How does Aetrix verify that LTC7151SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7151SIV#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 LTC7151SIV#PBF meets industry standards.
7.What is the process for return or replacement of LTC7151SIV#PBF?
All LTC7151SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7151SIV#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 LTC7151SIV#PBF part is unused and in its original packaging.
Return procedure for LTC7151SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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