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Analog Devices Inc. LT8644SIV#TRMPBF
- Part No.:
- LT8644SIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8644SIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 16A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:432
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Product details
Overview
LT8644SIV#TRMPBF from Analog Devices is a 24-lead LQFN synchronous step-down DC/DC regulator delivering up to 16A output at 1.2V from 5V input, featuring second-generation Silent Switcher 2 architecture, 20ns minimum on-time, and integrated bypass capacitors for ultralow EMI. It operates across 2.7V–8V SVIN and 1.5V–8V PVIN, supports PolyPhase® up to 12 phases, and targets high-density automotive power rails.
For engineers reviewing the LT8644SIV#TRMPBF datasheet, LT8644SIV#TRMPBF pinout, LT8644SIV#TRMPBF application, or LT8644SIV#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualification, ±0.8% reference accuracy over temperature, forced continuous mode for fast transient response, spread spectrum modulation for EMI reduction, and compatibility with 300kHz–3.5MHz external frequency programming via RT pin.
Technical Context
The LT8644SIV#TRMPBF implements peak current mode control with an internal 0.6V reference and external VC-loop compensation, enabling fast load transient response. Its dual-input architecture separates signal (SVIN) and power (PVIN) paths, supporting independent voltage domains and reducing noise coupling.
Second-generation Silent Switcher 2 integrates internal ceramic bypass capacitors on PVIN, BST, and INTVCC pins-minimizing high-di/dt loop area-and enables <10mVP-P output ripple and ultralow radiated EMI without requiring complex PCB layout. Spread spectrum modulation (±25% frequency dither) and programmable Burst Mode/FCM/SYNC operation provide flexible trade-offs between efficiency, EMI, and dynamic performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 16A max continuous - supports high-power SoC/FPGA core rails without external parallel stages |
| Input Voltage Range | SVIN: 2.7V–8V; PVIN: 1.5V–8V - enables flexible supply partitioning and wide battery/adapter compatibility |
| Output Voltage Range | 0.6V–VIN - supports sub-1V AI processor cores and standard 1.2V/1.8V/3.3V rails |
| Reference Accuracy | ±0.8% over –40°C to 125°C - ensures tight regulation across automotive temperature extremes |
| Switching Frequency | 300kHz–3.5MHz (RT-programmable) - allows optimization of size vs. efficiency; 2MHz typical for compact 1.2V/16A designs |
| Min On-Time | 20ns (typ) - enables high step-down ratios (e.g., 5V→1.2V) at 2MHz without pulse-skipping |
| Quiescent Current | 180µA in Burst Mode regulating 5V→1.2V - extends battery life in always-on automotive modules |
| Efficiency | 94% at 2MHz, 5V→1.2V/16A - reduces thermal load in confined enclosures |
Pinout & Package
LT8644SIV#TRMPBF uses a 24-lead 4mm × 4mm × 0.95mm LQFN package with exposed PGND pads (pins 25–28) for low thermal resistance (θJC(PAD) = 7°C/W). The package is RoHS-compliant with Au (e4) finish and MSL Level 3 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHMODE (1) | Phase configuration select | Ground = 2-phase; float = 3-phase; INTVCC = 4-phase - enables scalable multiphase current sharing |
| INTVCC (2) | Internal 3.6V regulator output | Bypass only; supplies internal logic/drivers; must not be loaded externally |
| AGND (3) | Remote feedback ground sense | Connect directly to output capacitor negative terminal to reject PCB IR drop |
| SVIN (4) | Signal input supply | Powers control circuitry; requires local 1µF bypass if separate from PVIN |
| PVIN (5,6,13,14,15) | Power input supply | High-current path to top switch; must be tied together and bypassed with ≥22µF capacitor |
| SW (8–12) | Switch node outputs | Parallel-connected power switch outputs; connect to inductor with minimal trace area for low EMI |
| PGND (16,25–28) | Power ground return | Return path for bottom switch; exposed pad must be soldered for thermal performance |
| EN/UV (17) | Enable & input UVLO input | Hysteresis = 40mV; threshold = 0.98V rising; enables programmable brownout protection |
| RT (18) | Frequency set resistor | Resistor to AGND sets fSW; 16.9kΩ = 2MHz - determines inductor size and efficiency trade-off |
| CLKOUT (19) | PolyPhase clock output | 50% duty cycle square wave; phase shifted per PHMODE - synchronizes multiple converters |
| SYNC/MODE (20) | Operating mode select | Ground = Burst Mode; float = FCM; INTVCC = FCM+spread spectrum; driven = external sync |
| SS (21) | Soft-start & tracking | 2µA internal pull-up; capacitor sets VOUT slew rate; enables power sequencing with other rails |
| VC (22) | Error amplifier output | External RC network compensates loop; enables bandwidth and phase margin tuning |
| PG (23) | Power good open-drain | Active-high when VFB within ±7.75%; pulled low during UVLO, thermal shutdown, or EN deassertion |
| FB (24) | Feedback voltage sense | Regulated to 0.6V; connect divider tap here; add 4.7–47pF phase lead capacitor to VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated PVIN/BST/INTVCC ceramic capacitors reduce high-frequency EMI by minimizing fast current loop area |
| PolyPhase® Operation | Up to 12-phase interleaving via CLKOUT and PHMODE - cuts input/output ripple and capacitor count |
| External Compensation (VC Pin) | Enables custom loop shaping for optimal transient response across varying loads and layouts |
| Spread Spectrum Modulation | ±25% triangular dither of switching frequency - lowers peak EMI amplitude without affecting average efficiency |
| AEC-Q100 Qualified | Rated for –40°C to 125°C junction temperature - validated for automotive infotainment, ADAS, and body control modules |
| Low-Ripple Burst Mode | 180µA IQ at no load with <10mVP-P ripple - maintains clean output while maximizing standby battery life |
Applications
| Automotive ADAS Camera Power Supply | Industrial PLC CPU Core Rail |
|---|---|
Use Scenario: Powers 12nm image signal processor (ISP) and MIPI CSI-2 serializer in surround-view camera module with strict EMI limits. IC Role / Device Role / Timing Role: Primary 1.2V/16A core regulator; provides precise, low-noise voltage with fast load-step response to handle bursty ISP workloads. Use Value: Silent Switcher 2 meets CISPR-25 Class 5 radiated emissions without shielding; 20ns min on-time avoids instability at 2MHz switching needed for small inductors. | Use Scenario: Delivers stable 1.2V core voltage to ARM Cortex-A53-based PLC controller operating in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-current buck converter with remote sensing (AGND) and AEC-Q100 reliability - ensures consistent timing margins under thermal stress. Use Value: ±0.8% reference accuracy over –40°C to 125°C prevents voltage droop-induced timing violations; PG pin enables safe system reset on undervoltage. |
| 5G Small Cell Baseband ASIC Supply | Medical Imaging FPGA Power |
Use Scenario: Supplies 1.1V/14A core rail to 5G NR baseband ASIC in thermally constrained outdoor small cell enclosure. IC Role / Device Role / Timing Role: High-efficiency, high-frequency buck regulator with forced continuous mode - sustains full 2MHz operation across 0–100% load for deterministic latency. Use Value: 94% efficiency at 2MHz/16A minimizes heat generation; θJC(PAD) = 7°C/W enables direct thermal coupling to heatsink via exposed PGND pad. | Use Scenario: Powers Xilinx Kintex Ultrascale+ FPGA in portable ultrasound scanner requiring ultra-low EMI to avoid RF interference with analog front-end. IC Role / Device Role / Timing Role: Low-EMI, low-ripple power source with soft-start (SS pin) for controlled power-up sequencing with analog subsystems. Use Value: <10mVP-P ripple and spread spectrum modulation suppress harmonics near LNA bands; SS pin enables synchronized ramp with ADC reference. |
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 |
|---|---|---|---|
| LTC3310S-1 | 10A max output; 2.25V–5.5V input; 500kHz–5MHz fSW; no integrated PVIN bypass caps | Lower current, narrower input range; suited for space-constrained point-of-load where 10A suffices | Select LTC3310S-1 when board area is critical and 10A output meets system requirements; verify EMI with external layout mitigation |
| MPQ8645PGLE-Z | 15A max; 2.7V–16V input; 500kHz–2.2MHz fSW; no AEC-Q100 rating; different pinout | Wider input range but unqualified for automotive; lacks Silent Switcher EMI performance | Choose MPQ8645PGLE-Z for industrial non-automotive use with higher VIN; confirm EMI compliance separately |
Compared with LTC3310S-1 and MPQ8645PGLE-Z, the LT8644SIV#TRMPBF uniquely combines 16A capability, AEC-Q100 qualification, integrated Silent Switcher 2 capacitors, and 20ns min on-time - making it the only option for high-current, low-EMI automotive core rails requiring guaranteed performance without layout dependency.
Availability
LT8644SIV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, 5G baseband power, and medical imaging equipment requiring stable component supply, AEC-Q100 reliability, and ultralow EMI compliance.
Supply support for LT8644SIV#TRMPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets.
The LT8644SIV#TRMPBF belongs to the Silent Switcher® 2 family of high-efficiency, ultralow-EMI DC/DC regulators designed specifically for demanding automotive and industrial applications where EMI compliance, thermal performance, and reliability are non-negotiable.
FAQ
What is the maximum output current capability of the LT8644SIV#TRMPBF?
The LT8644SIV#TRMPBF delivers up to 16A continuous output current under proper thermal conditions - verified with θJA = 24°C/W on demo board and θJC(PAD) = 7°C/W when exposed PGND pad is soldered to PCB. Derating applies above 85°C ambient; full 16A is specified at TJ ≤ 125°C.
Does the LT8644SIV#TRMPBF require external compensation components?
Yes, the LT8644SIV#TRMPBF uses external compensation via the VC pin: an RC network (typically 1–10kΩ + 100–1000pF) from VC to AGND sets loop bandwidth and phase margin. This enables optimization for specific inductor values, output capacitance, and load transient requirements - unlike fixed-compensation regulators.
How does the LT8644SIV#TRMPBF achieve ultralow EMI without complex PCB layout?
The LT8644SIV#TRMPBF achieves ultralow EMI through second-generation Silent Switcher 2 architecture: integrated ceramic bypass capacitors on PVIN, BST, and INTVCC pins minimize high-di/dt loop area internally. This eliminates layout sensitivity - radiated emissions meet CISPR-25 Class 5 even on 2-layer boards without shielding or ferrites.
Can the LT8644SIV#TRMPBF operate with input voltages below 3V?
Yes, the LT8644SIV#TRMPBF supports SVIN down to 2.7V and PVIN down to 1.5V. However, operation below 3V requires careful attention to minimum on-time constraints: at 2MHz, the 20ns min on-time limits practical step-down ratio (e.g., 2.7V→1.2V is viable; 2.0V→1.2V may require lower fSW).
What is the purpose of the PHMODE pin on the LT8644SIV#TRMPBF?
The PHMODE pin on the LT8644SIV#TRMPBF selects interleaved phase count for PolyPhase® operation: grounded = 2-phase, floating = 3-phase, tied to INTVCC = 4-phase. This controls CLKOUT phase shift relative to internal clock, enabling precise current sharing and ripple cancellation across multiple LT8644SIV#TRMPBF units.
LT8644SIV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 24-TFQFN 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):
- 1.5V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 8V
- Current - Output:
- 16A
- Frequency - Switching:
- 300kHz ~ 3.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8644SIV#TRMPBF FAQ
1.How can I place an order for LT8644SIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8644SIV#TRMPBF 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 LT8644SIV#TRMPBF reliable?
The price and inventory of LT8644SIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8644SIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8644SIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8644SIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8644SIV#TRMPBF?
LT8644SIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8644SIV#TRMPBF 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 LT8644SIV#TRMPBF?
For technical support, including LT8644SIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8644SIV#TRMPBF requirements.
6.How does Aetrix verify that LT8644SIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8644SIV#TRMPBF 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 LT8644SIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8644SIV#TRMPBF?
All LT8644SIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8644SIV#TRMPBF, 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 LT8644SIV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8644SIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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