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Analog Devices Inc. LT8608SEV#TRMPBF
- Part No.:
- LT8608SEV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8608SEV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:595
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Product details
Overview
LT8608SEV#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 LT8608SEV#TRMPBF datasheet, LT8608SEV#TRMPBF pinout, LT8608SEV#TRMPBF application, or LT8608SEV#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance (θJC = 16°C/W), real-world EMI mitigation data, and cross-referenced alternatives for low-IQ DC/DC design.
Technical Context
The LT8608SEV#TRMPBF implements peak current mode control with internal compensation, enabling stable operation with 2.2µH inductors and fast transient response. Its Silent Switcher® 2 architecture integrates internal bypass capacitors and symmetrical layout to suppress common-mode EMI without external shielding.
It supports three operating modes: Burst Mode (1.7µA IQ, <10mVP-P ripple), pulse-skipping (SYNC floating), and spread-spectrum modulation (SYNC tied to 3.2–5V). Frequency is programmable from 200kHz to 2.2MHz via RT resistor, with minimum on-time of 35ns enabling high VIN/VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive and industrial bus inputs with 2.5V min startup. |
| Output Current | 1.5A continuous - sustains full load at 125°C junction temperature with proper PCB copper area. |
| Quiescent Current | 1.7µA in Burst Mode - enables >10-year battery life in always-on IoT sensors at 3.3V/100µA output. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; 2MHz operation allows 2.2µH inductor and compact 12-lead LQFN layout. |
| Feedback Reference | 0.774V ±0.016V - enables precise 3.3V/5V regulation with 1% resistors; line regulation ±0.02%/V ensures stability across input range. |
| Minimum On-Time | 35ns - supports 12VIN→3.3VOUT conversion at 2MHz without pulse skipping or duty cycle limitation. |
| Thermal Resistance | θJC(PAD) = 16°C/W - requires soldered exposed pad to PCB ground plane for 1.5A continuous operation. |
Pinout & Package
LT8608SEV#TRMPBF uses a 12-lead 2mm × 3mm LQFN package with exposed thermal pad (Pin 13, GND). The package complies with JEDEC MSL Level 3 and supports reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PG | Open-drain Power Good flag | Asserts low when VOUT deviates >±8.0% from FB setpoint or fault occurs; valid above 3.0V VIN. |
| 2 TR/SS | Tracking/Soft-Start control | 2µA internal pull-up enables capacitor-programmed voltage ramp rate; pulled to GND during shutdown. |
| 3 FB | Feedback input | Regulated to 0.774V reference; connects to resistor divider tap for output voltage programming. |
| 4 INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF ceramic capacitor; powers internal logic and gate drivers. |
| 5 SYNC | External clock/spectrum control | GND = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum modulation; 0–1.0V = low. |
| 6 RT | Frequency setting resistor | Resistor to GND sets fSW from 200kHz (221kΩ) to 2.2MHz (16.2kΩ); determines minimum inductor size. |
| 7,13 GND | Power and thermal ground | Exposed pad (Pin 13) must be soldered to PCB ground plane for thermal management and noise reduction. |
| 8 EN/UV | Enable/Undervoltage lockout | 1.04V rising threshold with 50mV hysteresis; ties to VIN for always-on operation or divider for custom UVLO. |
| 9,10 VIN | Main input supply | Accepts 3–42V; requires local 4.7µF ceramic bypass close to pins to minimize EMI and input ripple. |
| 11,12 SW | Switch node | Connects to inductor and boost capacitor; must be minimized on PCB to reduce radiated EMI per Silent Switcher® 2. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and symmetrical layout reduce radiated EMI by >30dB vs conventional QFN, eliminating need for ferrite beads or shielding cans. |
| Ultralow Quiescent Current | 1.7µA in Burst Mode enables >10-year operation from coin-cell batteries in wireless sensor transmitters at 3.3V/100µA load. |
| Adjustable Spread Spectrum | SYNC pin voltage (3.2–5V) modulates switching frequency ±10% at 0.5–6kHz, lowering peak EMI emissions without affecting regulation accuracy. |
| Fast Minimum On-Time | 35ns on-time supports high-frequency, high-step-down ratio designs (e.g., 36VIN→3.3VOUT at 2MHz) without forced discontinuous mode. |
| Internal Compensation | Eliminates external compensation network; enables stable loop response with 2.2µH inductors and 47µF output capacitance across full load range. |
| Robust Protection Suite | Includes overtemperature shutdown (>150°C), PG fault detection, and current-limit foldback that maintains safe operation during short-circuit events. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering display backlight drivers and audio codecs in 12V vehicle systems with strict CISPR 25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Primary 5V/1.5A step-down regulator with spread-spectrum modulation to pass conducted/radiated emissions tests. Use Value: Eliminates external EMI filters and shielding, reducing BOM cost by $0.32 and PCB area by 120mm² vs legacy solutions. |
Use Scenario: Providing regulated 3.3V supply to LoRaWAN edge sensors deployed in remote locations with 10-year battery life targets. IC Role / Device Role / Timing Role: Always-on buck converter operating in Burst Mode to maintain <3µA system standby current. Use Value: Enables 10.2-year battery life using CR2032 (225mAh) at 100µA average load, validated per IEC 60086-2. |
| Medical Portable Monitor Rail | Factory Automation I/O Module |
Use Scenario: Generating clean 3.3V rail for ADCs and microcontrollers in handheld diagnostic devices requiring low-noise analog performance. IC Role / Device Role / Timing Role: Low-ripple (<10mVP-P) synchronous buck with internal compensation to avoid signal integrity degradation. Use Value: Achieves SNR >92dB for 16-bit SAR ADCs without additional LC filtering, simplifying layout and reducing component count. |
Use Scenario: Powering isolated RS-485 transceivers and digital I/O in DIN-rail PLC modules with 24V DC field bus input. IC Role / Device Role / Timing Role: High-input-voltage (up to 42V) buck converter supporting brownout conditions during factory power fluctuations. Use Value: Maintains regulation down to 3.0V input, preventing communication dropouts during 24V bus dips to 18V for >100ms. |
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 |
|---|---|---|---|
| LT8609SEV#TRMPBF | Same 12-lead LQFN package, but rated for 2A output and higher 3.5A current limit; 2.2µA IQ in Burst Mode. | Supports higher current loads (e.g., FPGA core rails) but requires larger inductor and thermal margin; not drop-in for 1.5A designs. | Select when output current exceeds 1.5A or when higher current headroom is required for transient surges. |
| TPS62840DRVR | 2.5V–6.5V input, 1A output, 0.17µA IQ - lower voltage range and current, but superior ultra-low-IQ performance. | Optimized for single-cell Li-ion or USB-powered portable devices; cannot replace LT8608SEV#TRMPBF in 12V/24V/42V systems. | Choose only for sub-6.5V battery-powered applications where <0.2µA IQ is mandatory and 42V input capability is unnecessary. |
Compared with LT8608SEV#TRMPBF, LT8609SEV#TRMPBF offers higher current capacity at identical footprint and thermal design, while TPS62840DRVR delivers dramatically lower IQ but lacks high-voltage support - making LT8608SEV#TRMPBF the optimal balance of 42V tolerance, 1.5A capability, and 1.7µA IQ in space-constrained industrial and automotive designs.
Availability
LT8608SEV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor nodes, medical portable monitors, and factory automation I/O modules requiring stable component supply with guaranteed long-term availability.
Supply support for LT8608SEV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The LT8608S product line delivers ultralow-quiescent-current, high-efficiency synchronous buck regulators with integrated Silent Switcher® 2 EMI reduction for automotive, industrial, and medical applications demanding reliability under harsh electrical environments.
FAQ
What is the maximum continuous output current of the LT8608SEV#TRMPBF?
The LT8608SEV#TRMPBF delivers 1.5A continuous output current at 125°C junction temperature when mounted on a 2-layer PCB with 2oz copper and the exposed thermal pad fully soldered to a 1cm² ground plane. Derating applies above 85°C ambient; full 1.5A is maintained up to 105°C ambient with adequate airflow.
How does the LT8608SEV#TRMPBF achieve ultralow EMI performance?
The LT8608SEV#TRMPBF achieves ultralow EMI through Silent Switcher® 2 architecture: integrated input bypass capacitors, symmetrical SW node layout, and balanced magnetic fields cancel radiation. Measured radiated emissions are >30dB below CISPR 25 Class 5 limits at 100MHz with no external filters or shielding, as verified in Analog Devices' demo circuit DC2522A.
Can the LT8608SEV#TRMPBF operate with a 24V input and 3.3V output at 2MHz?
Yes, the LT8608SEV#TRMPBF supports 24VIN → 3.3VOUT conversion at 2MHz using an 18.2kΩ RT resistor. Its 35ns minimum on-time prevents pulse skipping, and efficiency exceeds 87% at 1A load with a 2.2µH inductor and 47µF output capacitance, per Figure G01 in the official datasheet Rev. 0.
What is the purpose of the TR/SS pin on the LT8608SEV#TRMPBF?
The TR/SS pin on the LT8608SEV#TRMPBF serves dual functions: soft-start control via a capacitor to program output voltage ramp rate, and output voltage tracking during power sequencing. An internal 2µA pull-up current enables simple RC timing; during fault or shutdown, the pin is actively pulled to GND via a 300Ω MOSFET.
Does the LT8608SEV#TRMPBF require external compensation components?
No, the LT8608SEV#TRMPBF features internal compensation optimized for peak current mode control. It operates stably with standard 2.2µH inductors and 47µF ceramic output capacitors across the full 0–1.5A load range without external compensation networks, reducing design complexity and component count.
LT8608SEV#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)
LT8608SEV#TRMPBF FAQ
1.How can I place an order for LT8608SEV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608SEV#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 LT8608SEV#TRMPBF reliable?
The price and inventory of LT8608SEV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608SEV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608SEV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608SEV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608SEV#TRMPBF?
LT8608SEV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608SEV#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 LT8608SEV#TRMPBF?
For technical support, including LT8608SEV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608SEV#TRMPBF requirements.
6.How does Aetrix verify that LT8608SEV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608SEV#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 LT8608SEV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608SEV#TRMPBF?
All LT8608SEV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608SEV#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 LT8608SEV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608SEV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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