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Analog Devices Inc. LT8608SIV#TRMPBF
- Part No.:
- LT8608SIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8608SIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
LT8608SIV#TRMPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator with 1.7µA quiescent current in Burst Mode, peak current mode control, internal compensation, and Silent Switcher® 2 architecture for ultralow EMI. It delivers regulated 3.3V/5V outputs in automotive infotainment power rails and industrial sensor nodes requiring high efficiency at light loads.
For engineers reviewing the LT8608SIV#TRMPBF datasheet, LT8608SIV#TRMPBF pinout, LT8608SIV#TRMPBF application, or LT8608SIV#TRMPBF equivalent, key selection criteria include its 35ns minimum on-time, ±8% power-good accuracy, 200kHz–2.2MHz programmable switching frequency, and 12-lead 2mm × 3mm LQFN package with exposed thermal pad.
Technical Context
The LT8608SIV#TRMPBF implements a monolithic peak current mode PWM controller with internal top/bottom NMOS switches (260mΩ/125mΩ), fixed 0.774V feedback reference, and integrated 3.5V INTVCC regulator. Its oscillator supports resistor-programmed frequency (RT pin) or external synchronization (SYNC pin) with optional spread spectrum modulation.
Burst Mode operation enables <3µA input quiescent current at no load while maintaining <10mVP-P output ripple; frequency foldback and soft-start (TR/SS pin) ensure stable start-up under low-VIN or high-capacitance conditions. The EN/UV pin provides 1.04V accurate undervoltage lockout with 50mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V/36V automotive and industrial bus inputs without pre-regulation |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, FPGAs, and analog signal chains |
| Quiescent Current | 1.7µA in Burst Mode - enables >10-year battery life in always-on IoT sensors |
| Switching Frequency | 200kHz to 2.2MHz - allows trade-off between inductor size (2.2µH typical) and efficiency |
| Feedback Reference | 0.774V ±0.016V - enables precise output voltage setting with 1% resistors |
| Min On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping instability |
| Power-Good Accuracy | ±8.0% of VFB - ensures reliable system reset timing within defined regulation window |
Pinout & Package
LT8608SIV#TRMPBF is housed in a thermally enhanced 12-lead LQFN package (2mm × 3mm, 0.5mm pitch) with exposed GND pad (Pin 13) requiring PCB soldering for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG (1) | Open-drain power-good flag | Asserts low when VOUT deviates >±8% from target or fault occurs; requires external pull-up |
| TR/SS (2) | Soft-start and tracking control | Capacitor-programmed voltage ramp rate; enables output sequencing with other regulators |
| FB (3) | Feedback input | Regulates to 0.774V; connects to resistor divider tap for output voltage programming |
| INTVCC (4) | Internal 3.5V supply bypass | Must be decoupled with ≥1µF ceramic capacitor; powers internal logic and gate drivers |
| SYNC (5) | Frequency synchronization input | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread-spectrum EMI reduction |
| RT (6) | Frequency set resistor | Resistor to GND programs fSW from 200kHz to 2.2MHz per Analog Devices Table 1 |
| GND (7,13) | Power and thermal ground | Exposed pad (Pin 13) must be soldered to PCB plane for θJA = 41°C/W (demo board) |
| EN/UV (8) | Enable and input UVLO input | 1.04V rising threshold with 50mV hysteresis; shuts down device drawing only 1µA IIN |
| VIN (9,10) | Main input power | Supplies internal circuitry and top switch; requires local 4.7µF ceramic bypass |
| SW (11,12) | Switch node | Connects to inductor and boost capacitor; must be minimized on PCB to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and symmetrical layout reduce radiated EMI by >30dB vs legacy buck converters |
| Ultralow Quiescent Current | 1.7µA in Burst Mode enables >10-year operation from coin-cell batteries in remote sensors |
| Adjustable Spread Spectrum | SYNC pin voltage controls 0.5–6kHz modulation depth, lowering peak EMI emissions without filter redesign |
| Fast Transient Response | Peak current mode + internal compensation achieves <10µs recovery from 50% load steps at 2MHz |
| Robust Thermal Management | Exposed GND pad and θJC(PAD) = 16°C/W enable 1.5A operation at 85°C ambient without heatsink |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering 3.3V MCU, CAN transceiver, and display driver in head unit with 12V battery input subject to cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary DC/DC converter providing regulated 3.3V rail with fast line transient response and ultralow IQ during sleep modes. Use Value: Maintains 3.3V regulation across 4.5–40V input range while consuming <3µA in vehicle-off state, extending battery life. | Use Scenario: Supplying 5V to wireless sensor module (BLE/Wi-Fi SoC + analog front-end) in factory automation node powered by 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling >90% efficiency at 750mA load while meeting CISPR 22 Class B EMI limits. Use Value: Silent Switcher 2 architecture eliminates need for external EMI filters, reducing BOM cost and PCB area by 30%. |
| Portable Medical Instrument | Test & Measurement Equipment |
Use Scenario: Generating clean 5V rail for precision ADC and op-amp signal chain in handheld ECG monitor powered by Li-ion battery. IC Role / Device Role / Timing Role: Low-noise power source with <10mVP-P ripple in Burst Mode, supporting 16-bit ADC accuracy. Use Value: Output ripple remains below 0.2% of 5V full-scale, eliminating post-regulation LDO and saving 150mW dissipation. | Use Scenario: Providing 3.3V supply to FPGA configuration memory and interface logic in benchtop oscilloscope with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronizable switching regulator allowing alignment to system clock to avoid beat frequencies with sensitive analog circuits. Use Value: SYNC pin enables deterministic noise placement, simplifying EMC pre-compliance testing by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRMPBF | Same 12-lead LQFN package, but rated for 2A output current and 40V max input; higher top-switch RDS(ON) (320mΩ) | Preferred for designs requiring >1.5A continuous load or tighter input voltage margin (40V vs 42V) | Select LT8609SIV#TRMPBF when output current exceeds 1.5A or when lower thermal resistance is critical at full load |
| TPS62865ARGRR | 3A rating, 5.5V max input, 1.8V min output; uses DCS-Control topology instead of peak current mode | Targeted at low-voltage, high-current consumer applications (e.g., USB-C PD); lacks Silent Switcher EMI performance | Choose TPS62865ARGRR only for sub-5.5V input systems where 3A output and small solution size outweigh EMI requirements |
Compared with LT8609SIV#TRMPBF and TPS62865ARGRR, the LT8608SIV#TRMPBF uniquely balances 42V input capability, 1.5A output, ultralow IQ, and industry-leading EMI performance in a 2mm × 3mm footprint-making it optimal for space-constrained, battery-sensitive, and EMI-critical industrial and automotive applications.
Availability
LT8608SIV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, portable medical instruments, and test & measurement equipment requiring stable component supply and long-term lifecycle support.
Supply support for LT8608SIV#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 industrial, automotive, communications, and healthcare markets.
The LT8608SIV#TRMPBF belongs to the Silent Switcher® step-down regulator product line, engineered specifically for ultralow EMI and ultralow quiescent current in battery-powered and noise-sensitive applications.
FAQ
What is the maximum input voltage rating for LT8608SIV#TRMPBF?
The LT8608SIV#TRMPBF has an absolute maximum input voltage rating of 42V, with guaranteed operation across 3.0V to 42V. This enables direct connection to 24V industrial buses and 12V automotive systems including load-dump transients. Exceeding 42V may cause permanent damage per Absolute Maximum Ratings table.
How does the LT8608SIV#TRMPBF achieve ultralow quiescent current?
The LT8608SIV#TRMPBF achieves 1.7µA quiescent current in Burst Mode by shutting down all non-essential circuitry between energy pulses, delivering single small current bursts to maintain output voltage. At no load, total input current drops to <3µA, enabling multi-year battery life in always-on applications like remote sensors.
Can LT8608SIV#TRMPBF synchronize to an external clock?
Yes, the LT8608SIV#TRMPBF supports external clock synchronization via the SYNC pin. When driven with a TTL/CMOS clock signal, it aligns switching edges to the external source while operating in pulse-skipping mode. This feature prevents beat frequencies in systems with multiple synchronized converters, such as test equipment or FPGA-based platforms.
What is the purpose of the TR/SS pin on LT8608SIV#TRMPBF?
The TR/SS pin on LT8608SIV#TRMPBF serves dual functions: soft-start control and output voltage tracking. A capacitor from TR/SS to GND programs the output voltage ramp rate during startup, preventing inrush current. When driven externally, it enables precise sequencing with other regulators in multi-rail systems.
Does LT8608SIV#TRMPBF require external compensation components?
No, the LT8608SIV#TRMPBF features fully internal compensation using peak current mode control. This eliminates the need for external Type II or Type III compensation networks, reducing design complexity and component count while ensuring stable operation with small inductors (e.g., 2.2µH) across its full operating range.
LT8608SIV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 12-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):
- 2.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.77V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x3)
LT8608SIV#TRMPBF FAQ
1.How can I place an order for LT8608SIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608SIV#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 LT8608SIV#TRMPBF reliable?
The price and inventory of LT8608SIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608SIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608SIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608SIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608SIV#TRMPBF?
LT8608SIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608SIV#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 LT8608SIV#TRMPBF?
For technical support, including LT8608SIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608SIV#TRMPBF requirements.
6.How does Aetrix verify that LT8608SIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608SIV#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 LT8608SIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608SIV#TRMPBF?
All LT8608SIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608SIV#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 LT8608SIV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608SIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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