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Analog Devices Inc. LT8644SIV#TRPBF
- Part No.:
- LT8644SIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8644SIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 16A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
LT8644SIV#TRPBF from Analog Devices is a 1.5V–8V input, 0.6V–VIN output, 16A synchronous step-down Silent Switcher 2 regulator with 20ns minimum on-time, 2MHz switching frequency (adjustable 300kHz–3.5MHz), and ±0.8% reference accuracy - designed for automotive and industrial power supplies requiring ultralow EMI and high efficiency at high frequency.
For engineers reviewing the LT8644SIV#TRPBF datasheet, LT8644SIV#TRPBF pinout, LT8644SIV#TRPBF application, or LT8644SIV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, integrated bypass capacitors for EMI reduction, PolyPhase® support up to 12 phases, and external VC compensation for fast transient response in compact 4mm × 4mm LQFN packages.
Technical Context
The LT8644SIV#TRPBF employs peak current mode control with a 20ns minimum on-time to enable high step-down ratios at 2MHz+ frequencies. Its second-generation Silent Switcher 2 architecture integrates internal bypass capacitors on PVIN, BST, and INTVCC pins to minimize fast-current-loop radiated emissions without layout sensitivity.
PolyPhase® operation is enabled via PHMODE and CLKOUT pins, supporting 2-, 3-, or 4-phase interleaving; SYNC/MODE pin selects Burst Mode (low IQ), forced continuous mode (fast transients), spread spectrum (±25% frequency modulation), or external synchronization - all while maintaining stable regulation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | PVIN: 1.5V–8V; SVIN: 2.7V–8V - supports wide-input automotive and industrial rails including cold-crank scenarios. |
| Output Current | 16A continuous - delivers full rated load with thermal management via exposed PGND pad soldering. |
| Switching Frequency | 300kHz–3.5MHz (RT-programmable) - enables small magnetics and high-density designs without sacrificing efficiency. |
| Reference Accuracy | ±0.8% over temperature - ensures tight output regulation across automotive operating range. |
| Quiescent Current | 180µA in Burst Mode regulating 5VIN→1.2VOUT - extends battery life in always-on systems. |
| EMI Performance | Ultralow radiated emissions on any PCB - achieved via integrated bypass caps and optimized internal fast-current loops. |
| Min On-Time | 20ns - allows 5V→1.2V conversion at 2MHz with single-stage buck topology. |
| Package | 24-lead 4mm × 4mm LQFN - RoHS-compliant, MSL3, –40°C to 125°C automotive-grade thermal rating. |
Pinout & Package
The LT8644SIV#TRPBF is housed in a 24-lead LQFN package (4mm × 4mm × 0.95mm) with exposed PGND pads (pins 25–28) that must be soldered to PCB for thermal performance. Pin pitch is 0.5mm; package conforms to JEDEC MO-220 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHMODE (1) | Phase configuration selector | Ground = 2-phase; float = 3-phase; INTVCC = 4-phase - enables scalable multiphase power delivery. |
| INTVCC (2) | Internal 3.6V regulator bypass | Must be floated; powers internal logic/drivers; voltage varies 2.6V–3.6V with SVIN. |
| AGND (3) | Remote feedback ground sense | Connect directly to output capacitor negative terminal and FB divider ground for accurate regulation. |
| SVIN (4) | Signal input supply | Powers internal circuitry; requires local 1µF bypass if separate from PVIN. |
| PVIN (5,6,13,14,15) | Power input supply | Supplies topside switch; must be tied together and bypassed with ≥22µF capacitor near pins. |
| BST (7) | Bootstrap drive voltage | Provides gate drive >VIN for top switch; must be floated - no external connection. |
| SW (8–12) | Switch node outputs | Tied together to inductor; keep trace area minimal to reduce EMI and switching losses. |
| PGND (16,25–28) | Power ground return | Return path for bottom switch; exposed pads require PCB soldering for θJC(PAD) = 7°C/W thermal performance. |
| EN/UV (17) | Enable and input UVLO | Hysteretic threshold (0.94V/0.98V); resistor divider sets custom VIN shutdown point. |
| RT (18) | Frequency programming | Resistor to AGND sets switching frequency (e.g., 16.9kΩ = 2MHz); enables precise EMI tuning. |
| CLKOUT (19) | PolyPhase clock output | 50% duty cycle square wave; phase shifted per PHMODE setting; low in Burst Mode. |
| SYNC/MODE (20) | Operating mode control | Ground = Burst Mode; float = FCM; INTVCC = FCM + spread spectrum; driven = sync to external clock. |
| SS (21) | Soft-start and tracking | 2µA internal pull-up enables capacitor-programmed slew rate; pulled low during fault/shutdown. |
| VC (22) | Error amplifier output | External RC network from VC to AGND sets loop compensation for optimal transient response. |
| PG (23) | Power good indicator | Open-drain output active high when FB within ±7.75% of 0.6V and no faults (UVLO, thermal, etc.). |
| FB (24) | Feedback voltage sense | Regulated to 0.6V; connect resistor divider tap here; add 4.7–47pF phase-lead cap to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated PVIN/BST/INTVCC bypass capacitors eliminate layout-dependent EMI, enabling compliance with CISPR 25 Class 5 without shielding. |
| PolyPhase® Operation Support | Up to 12-phase interleaving via CLKOUT and PHMODE pins - reduces input/output ripple and capacitor count in high-current systems. |
| Adjustable Spread Spectrum | ±25% triangular frequency modulation (e.g., 2MHz → 1.5–2.5MHz) - lowers peak EMI by spreading energy across wider bandwidth. |
| Fast Transient Response | External VC compensation enables <10µs recovery from 4A→12A load steps with <50mV undershoot. |
| AEC-Q100 Automotive Grade | Qualified for –40°C to 125°C junction temperature with controlled manufacturing - suitable for ADAS, infotainment, and body electronics. |
| Low-Ripple Burst Mode | 180µA IQ at no load with <10mVP-P output ripple - maintains regulation while minimizing standby power in always-on applications. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers image sensor and radar SoC in forward collision warning system with strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V→1.2V/16A buck converter delivering clean, low-noise core voltage under engine noise and RF interference. Use Value: Silent Switcher 2 architecture meets CISPR 25 Class 5 without ferrite beads or metal shields, reducing BOM cost and board area. | Use Scenario: Supplies field-programmable gate array (FPGA) and analog front-end in modular industrial controller. IC Role / Device Role / Timing Role: High-current, thermally robust DC/DC regulator handling 12V input derating and 40°C ambient rise. Use Value: Exposed PGND pad and θJC(PAD) = 7°C/W enable 16A operation without heatsink in confined enclosures. |
| Medical Imaging Sensor Bias | Telecom Base Station FPGA Core |
Use Scenario: Generates stable 1.8V bias for CMOS image sensor array in portable ultrasound device. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with soft-start to prevent sensor reset during power-up. Use Value: SS pin programmability and ±0.8% reference ensure precise voltage ramp and regulation critical for pixel linearity. | Use Scenario: Provides 0.85V/12A core voltage for 5G baseband processor in outdoor macro cell unit. IC Role / Device Role / Timing Role: Synchronized PolyPhase regulator operating at 2.5MHz to avoid sensitive IF bands and reduce filter size. Use Value: RT-programmable frequency and CLKOUT phase alignment allow precise EMI placement and multi-rail coordination. |
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 |
|---|---|---|---|
| LT8645SIV#TRPBF | Same architecture, 20V max PVIN, 12A output, higher input voltage range | Required for 12V/24V automotive or industrial inputs where LT8644SIV#TRPBF's 8V PVIN limit is insufficient | Select when input rail exceeds 8V or higher fault protection margin is needed; same footprint and pinout. |
| MPQ4436GL-AEC1-Z | Monolithic 18V/6A buck, AEC-Q100, but no integrated bypass caps or Silent Switcher EMI optimization | Lower current, lower EMI performance - suitable for non-critical subsystems where size/EMI are less constrained | Choose for cost-sensitive, lower-power automotive modules where full Silent Switcher benefits are unnecessary. |
Compared with LT8644SIV#TRPBF, LT8645SIV#TRPBF extends input voltage capability for 12V/24V systems while retaining identical EMI performance and package; MPQ4436GL-AEC1-Z offers AEC-Q100 qualification at lower current and without integrated EMI mitigation, making it a functional but not drop-in alternative.
Availability
LT8644SIV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, medical imaging sensor bias circuits, and telecom base station FPGA core supplies requiring stable component supply, AEC-Q100 compliance, and ultralow EMI performance.
Supply support for LT8644SIV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8644SIV#TRPBF belongs to the Silent Switcher 2 family of high-efficiency, ultralow-EMI DC/DC regulators - engineered specifically for automotive and industrial applications demanding robust operation in electrically noisy environments with minimal filtering.
FAQ
What is the maximum input voltage rating for the LT8644SIV#TRPBF?
The LT8644SIV#TRPBF has absolute maximum ratings of 10V on PVIN and SVIN pins. Its operational PVIN range is 1.5V to 8V, and SVIN range is 2.7V to 8V. Exceeding 8V in normal operation violates the specified operating conditions, though the 10V absolute max provides limited transient margin. Always maintain PVIN ≤ 8V and SVIN ≤ 8V during continuous operation to ensure reliability and specification compliance for the LT8644SIV#TRPBF.
Does the LT8644SIV#TRPBF support synchronization to an external clock?
Yes, the LT8644SIV#TRPBF supports external clock synchronization via the SYNC/MODE pin. When driven with a clean CMOS-level clock signal, the device locks its internal oscillator to the external frequency and operates in forced continuous mode. The input clock must meet specified voltage thresholds (low ≤ 0.5V, high ≥ VINTVCC – 0.5V) and have sufficient drive strength. This feature enables precise EMI frequency placement and multi-rail coordination in systems using the LT8644SIV#TRPBF.
How does the LT8644SIV#TRPBF achieve ultralow EMI performance?
The LT8644SIV#TRPBF achieves ultralow EMI through second-generation Silent Switcher 2 architecture, which integrates ceramic bypass capacitors inside the package for PVIN, BST, and INTVCC nodes. This minimizes the size of all fast-switching current loops, reducing magnetic field radiation. Combined with symmetrical layout, optimized edge rates, and optional spread spectrum modulation, it meets CISPR 25 Class 5 without external shielding - a key differentiator of the LT8644SIV#TRPBF.
What thermal considerations apply to the LT8644SIV#TRPBF in 16A operation?
For 16A continuous operation, the LT8644SIV#TRPBF requires soldering of all exposed PGND pads (pins 25–28) to a large PCB copper area with ≥6 thermal vias to inner ground planes. With proper layout, θJC(PAD) = 7°C/W enables junction temperatures within –40°C to 125°C limits. Demo board data shows ~40°C case rise at 16A/2MHz/5VIN→1.2VOUT in still air - confirming thermal viability of the LT8644SIV#TRPBF in compact designs when thermal guidelines are followed.
Can the LT8644SIV#TRPBF operate in forced continuous mode across the full load range?
Yes, the LT8644SIV#TRPBF supports forced continuous mode (FCM) across the full 0–16A load range by floating the SYNC/MODE pin. In FCM, the regulator maintains constant switching frequency, allows reverse inductor current, and delivers superior transient response - especially critical for FPGA and processor core supplies. Unlike Burst Mode, FCM eliminates low-frequency output ripple and ensures predictable EMI spectrum, making it the preferred mode for the LT8644SIV#TRPBF in high-performance digital loads.
LT8644SIV#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT8644SIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8644SIV#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 LT8644SIV#TRPBF reliable?
The price and inventory of LT8644SIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8644SIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8644SIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8644SIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8644SIV#TRPBF?
LT8644SIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8644SIV#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 LT8644SIV#TRPBF?
For technical support, including LT8644SIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8644SIV#TRPBF requirements.
6.How does Aetrix verify that LT8644SIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8644SIV#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 LT8644SIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8644SIV#TRPBF?
All LT8644SIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8644SIV#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 LT8644SIV#TRPBF part is unused and in its original packaging.
Return procedure for LT8644SIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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