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Analog Devices Inc. LTC7151SEV#TRPBF
- Part No.:
- LTC7151SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LTC7151SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:685
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Product details
Overview
LTC7151SEV#TRPBF 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 programmable 400kHz–3MHz switching frequency - used in high-efficiency point-of-load power delivery for FPGA and ASIC core rails.
For engineers reviewing the LTC7151SEV#TRPBF datasheet, LTC7151SEV#TRPBF pinout, LTC7151SEV#TRPBF application, or LTC7151SEV#TRPBF equivalent, key selection considerations include its integrated bypass capacitors for EMI reduction, differential remote sense capability, PolyPhase® support up to 12 phases, and AEC-Q100 Grade 0 qualification for automotive under-hood use.
Technical Context
The LTC7151SEV#TRPBF implements a controlled-on-time, constant-frequency current-mode architecture with internal top/bottom NMOS switches (11mΩ/4mΩ RDS(ON)), enabling fast transient response in high step-down ratio applications. Its second-generation Silent Switcher 2 design integrates VIN and BOOST bypass capacitors to minimize high-di/dt loop area and suppress radiated EMI.
PolyPhase® operation is enabled via CLKOUT and PHMODE pins, supporting 2-, 3-, or 4-phase configurations with precise phase offset control (180°/120°/90°) and external synchronization from 400kHz to 3MHz. The device supports both forced continuous and discontinuous conduction modes via MODE/SYNC pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.1V to 20V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| IOUT Max | 15A continuous - delivers full-rated current in thermally enhanced 4mm × 5mm LQFN package with θJA = 31°C/W. |
| VOUT Range | 0.5V to 5.5V - adjustable via external resistor divider; enables direct core voltage regulation for modern processors. |
| Reference Accuracy | ±1% over –40°C to 150°C - ensures stable output under extreme ambient conditions without calibration. |
| Switching Frequency | 400kHz to 3MHz - programmable with RT resistor; higher frequencies reduce inductor/capacitor size and improve transient response. |
| EMI Performance | Silent Switcher 2 architecture with integrated bypass caps - meets CISPR 25 Class 5 limits without shielding or ferrites in typical layouts. |
| Thermal Rating | Junction temperature range –40°C to 125°C - qualified per LTC7151SE grade; suitable for industrial and automotive under-hood environments. |
Pinout & Package
Package: 28-lead thermally enhanced 4mm × 5mm LQFN (exposed GND pad, 0.74mm height); RoHS-compliant, e4 Au finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKOUT (1) | PolyPhase clock output | Drives MODE/SYNC of downstream regulators; phase offset set by PHMODE pin state (180°/120°/90°). |
| 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 local 0.1µF ceramic bypass to minimize noise on control circuitry. |
| PVIN (4,5,18,19) | Main power input | Connects directly to high-current input source; multiple pins reduce trace resistance and thermal stress. |
| GND (6–8,15–17,29–32) | Power/signal ground | Exposed thermal pad (pins 29–32) must be soldered to PCB plane for optimal thermal performance (θJC(PAD) = 6°C/W). |
| SW (9–14) | Switch node | High-current connection to external inductor; six parallel pins reduce parasitic inductance and improve efficiency. |
| INTVCC (20) | Internal 3.3V supply | Output of integrated LDO; requires ≥4.7µF low-ESR ceramic capacitor to sustain gate drive transients. |
| MODE/SYNC (21) | DCM/CCM 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; minimizes voltage error from PCB trace IR drop at load. |
| FB (23) | Feedback input | Compares divided VOUT against 0.5V reference; supports differential sensing with VOUT– for precision regulation. |
| ITH (24) | Error amplifier output | Controls valley current limit; external RC network (RITH/CITH/CITHP) sets loop compensation per switching frequency. |
| TRACK/SS (25) | Soft-start & tracking | 6µA internal pull-up enables soft-start with external capacitor; 0–0.5V input overrides reference for output tracking. |
| PGOOD (26) | Power-good indicator | Open-drain output asserts low when FB deviates >±8% from 0.5V; supports sequencing and fault monitoring. |
| RT (27) | Frequency programming | Resistor to GND sets fSW = 1.67×10¹¹/RT; 54kΩ–405kΩ yields 3MHz–400kHz range. |
| PHMODE (28) | Phase offset control | INTVCC = 2-phase (180°), GND = 3-phase (120°), float/INTVCC/2 = 4-phase (90°); enables scalable multiphase designs. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN/BOOST ceramic capacitors reduce high-frequency EMI by >30dB vs first-gen, eliminating need for external snubbers or shielded inductors. |
| Differential VOUT remote sense | VOUT– pin enables Kelvin sensing at load; maintains ±0.5% output accuracy despite >100mΩ PCB trace resistance between IC and POL. |
| PolyPhase® scalability | Supports up to 12 synchronized phases using CLKOUT/PHMODE/MODE-SYNC; reduces input/output ripple by √N and allows modular high-current designs. |
| Accurate RUN threshold | 1.20V ±100mV rising threshold enables precise SVIN UVLO setting via resistor divider - critical for battery-powered systems with variable input. |
| Robust protection suite | Includes PVIN overvoltage lockout (24.5V trip), PGOOD with ±8% window, thermal shutdown, and reverse-current prevention - no external components required. |
Applications
| Automotive ADAS Power Supply | Server CPU Core Rail |
|---|---|
Use Scenario: Powering image signal processors and radar SoCs in automotive camera modules requiring low EMI in crowded harness environments. IC Role / Device Role / Timing Role: Primary 1.0V/15A point-of-load regulator with differential remote sense and Silent Switcher 2 EMI suppression. Use Value: Meets CISPR 25 Class 5 radiated emissions limits without metal shielding, reducing BOM cost and board space by >25% vs legacy solutions. |
Use Scenario: Delivering tightly regulated 1.2V core voltage to high-performance server CPUs with rapid load transients up to 100A/µs. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck controller with 20ns minimum on-time and current-mode control for sub-100ns response. Use Value: Maintains <±10mV output deviation during 10A–15A load steps at 1MHz switching, eliminating need for additional bulk capacitance. |
| Industrial PLC I/O Module | 5G Baseband Radio Card |
Use Scenario: Generating isolated 3.3V/5A and 1.8V/8A rails in DIN-rail mounted programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Dual-output capable regulator (with companion LTC7151S) using PolyPhase® to share thermal load across two ICs. Use Value: Enables 95% peak efficiency at 24V→3.3V conversion while maintaining junction temperature <105°C in sealed enclosures. |
Use Scenario: Powering RF transceivers and FPGAs in compact 5G small-cell radio units where board area and thermal density are constrained. IC Role / Device Role / Timing Role: Compact 4mm×5mm buck regulator with integrated bypass caps, supporting 2MHz operation to shrink passive size. Use Value: Reduces total solution footprint by 40% vs discrete controller+driver solutions while achieving <15mV p-p output ripple at 1.1V/12A. |
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 |
|---|---|---|---|
| MPM3695-100 from Monolithic Power Systems | 100A peak current rating (dual-phase), smaller 6mm × 6mm QFN, but lacks differential remote sense and PolyPhase® master/slave clocking. | Better suited for ultra-high-current single-rail applications; not ideal for multi-rail sequencing or strict EMI-limited automotive designs. | Select when system-level current demand exceeds 15A per rail and board space permits larger package. |
| TPS546D24A from Texas Instruments | 12A rated, PMBus-enabled, supports AVS and telemetry; no integrated Silent Switcher EMI mitigation - requires external snubbers for Class 5 compliance. | Preferred for datacenter applications requiring digital power management and telemetry; unsuitable for automotive EMI-critical zones without added filtering. | Choose when digital interface, margining, and real-time monitoring outweigh EMI performance and analog simplicity. |
Compared with MPM3695-100 and TPS546D24A, the LTC7151SEV#TRPBF uniquely combines 15A analog regulation, differential remote sensing, integrated EMI suppression, and scalable PolyPhase® operation in a thermally optimized 4mm × 5mm package - making it optimal for space-constrained, EMI-sensitive, and thermally demanding industrial and automotive point-of-load applications.
Availability
LTC7151SEV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, server CPU core supplies, and industrial PLC I/O systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified reliability.
Supply support for LTC7151SEV#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, 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 DC/DC regulators for demanding point-of-load applications - designed specifically for automotive under-hood, server, and industrial systems requiring robust thermal performance and precise voltage regulation.
FAQ
What is the maximum output current supported by the LTC7151SEV#TRPBF?
The LTC7151SEV#TRPBF delivers up to 15A continuous output current in its specified thermal environment. This rating assumes proper PCB layout with the exposed thermal pad soldered to a sufficient copper area, ambient temperature ≤85°C, and input voltage ≤12V. At higher input voltages or elevated ambient temperatures, derating per the thermal characteristics in the datasheet is required to maintain safe junction temperature.
Does the LTC7151SEV#TRPBF support differential remote sensing?
Yes, the LTC7151SEV#TRPBF supports true differential remote sensing via dedicated VOUT– and FB pins. Connecting VOUT– directly to the negative terminal of the output capacitor at the load point compensates for IR drop across PCB traces, ensuring ±0.5% output accuracy even with >100mΩ interconnect resistance - a critical feature for high-current, low-voltage applications like FPGA core rails.
How is the switching frequency programmed on the LTC7151SEV#TRPBF?
The switching frequency of the LTC7151SEV#TRPBF is set by an external resistor connected from the RT pin to GND. Using the formula fSW = 1.67×10¹¹ / RT(Ω), a 162kΩ resistor yields ~1.03MHz. Frequency range spans 400kHz to 3MHz, corresponding to RT values from 405kΩ down to 54kΩ. The device also supports external synchronization via the MODE/SYNC pin within ±30% of the programmed frequency.
What thermal grade does the LTC7151SEV#TRPBF carry?
The LTC7151SEV#TRPBF is the LTC7151SE grade, qualified for operation from –40°C to +125°C junction temperature. It is not AEC-Q100 qualified; for automotive applications requiring Grade 0 (–40°C to +150°C), the LTC7151SJ-4 variant (e.g., LTC7151SJ-4#WTRPBF) must be selected instead. Thermal performance is enhanced by the 4mm × 5mm LQFN package with exposed GND pad and low θJA = 31°C/W.
Can the LTC7151SEV#TRPBF operate in discontinuous conduction mode (DCM)?
Yes, the LTC7151SEV#TRPBF supports DCM operation. Tying the MODE/SYNC pin to GND configures the device for DCM, which improves light-load efficiency by disabling the bottom MOSFET when inductor current reaches zero. In contrast, floating MODE/SYNC or applying >1V selects forced continuous conduction mode (CCM) - essential for applications requiring consistent switching frequency and minimal output ripple across all load conditions.
LTC7151SEV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (5x4)
LTC7151SEV#TRPBF FAQ
1.How can I place an order for LTC7151SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7151SEV#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 LTC7151SEV#TRPBF reliable?
The price and inventory of LTC7151SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7151SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7151SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7151SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7151SEV#TRPBF?
LTC7151SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7151SEV#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 LTC7151SEV#TRPBF?
For technical support, including LTC7151SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7151SEV#TRPBF requirements.
6.How does Aetrix verify that LTC7151SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7151SEV#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 LTC7151SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7151SEV#TRPBF?
All LTC7151SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7151SEV#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 LTC7151SEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC7151SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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