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Analog Devices Inc. LT8608SIV#TRPBF
- Part No.:
- LT8608SIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8608SIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
LT8608SIV#TRPBF 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, industrial sensor nodes, and battery-powered IoT edge devices.
For engineers reviewing the LT8608SIV#TRPBF datasheet, LT8608SIV#TRPBF pinout, LT8608SIV#TRPBF application, or LT8608SIV#TRPBF 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#TRPBF implements a monolithic peak-current-mode PWM controller with internal top/bottom NMOS switches (260mΩ/125mΩ RDS(ON)), 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 to reduce EMI peaks.
Burst Mode operation enables <3µA input quiescent current at no load while maintaining <10mVP-P output ripple; EN/UV pin provides 1.04V rising-threshold undervoltage lockout with 50mV hysteresis, and PG pin signals output regulation status within ±8.0% of setpoint.
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. |
| Continuous Output Current | 1.5A - sufficient for powering microcontrollers, FPGAs, and analog front-ends in compact systems. |
| Quiescent Current (Burst Mode) | 1.7µA - enables >10-year battery life in always-on sensor nodes with 100µA typical load. |
| Switching Frequency Range | 200kHz to 2.2MHz - allows trade-off between inductor size (e.g., 2.2µH at 2MHz) and efficiency. |
| Feedback Reference Voltage | 0.774V ±0.014V - sets output voltage via resistor divider; enables precise 3.3V/5V generation with 1% resistors. |
| Minimum On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping instability. |
| Power-Good Accuracy | ±8.0% - ensures reliable system reset sequencing when VOUT reaches regulation window. |
Pinout & Package
LT8608SIV#TRPBF 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 (Pin 1) | Open-drain power-good flag | Asserts low when FB voltage deviates >±8% from 0.774V or fault occurs; requires external pull-up. |
| TR/SS (Pin 2) | Soft-start and tracking control | Capacitor here programs output ramp rate; voltage <0.774V forces FB to track TR/SS for sequencing. |
| FB (Pin 3) | Feedback input | Regulated to 0.774V; connects to resistor divider tap to set VOUT; input bias current ±20nA. |
| INTVCC (Pin 4) | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF ceramic capacitor; supplies internal logic and gate drivers. |
| SYNC (Pin 5) | Frequency synchronization input | GND = Burst Mode; float = pulse-skipping; INTVCC = spread-spectrum; 2.7–3.2V = external clock sync. |
| RT (Pin 6) | Oscillator frequency setting | Resistor to GND sets fSW from 200kHz (221kΩ) to 2.2MHz (16.2kΩ); modulated in spread-spectrum mode. |
| GND (Pins 7, 13) | Power and signal ground | Exposed pad (Pin 13) must be soldered to PCB ground plane for θJA = 41°C/W (demo board). |
| EN/UV (Pin 8) | Enable and input UVLO control | 1.04V rising threshold with 50mV hysteresis; pulls VIN current to 1µA in shutdown. |
| VIN (Pins 9, 10) | Main input supply | Supplies internal circuitry and top switch; requires local 4.7µF ceramic bypass near pins. |
| SW (Pins 11, 12) | Switch node | Connects to inductor and boost capacitor; must be minimized on PCB to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and symmetrical layout minimize differential-mode EMI without shielding or ferrites. |
| Ultralow Quiescent Current | 1.7µA in Burst Mode enables >10-year shelf life in battery-backed applications like smart meters. |
| Adjustable Spread-Spectrum Modulation | 0.5–6kHz modulation depth on SYNC pin reduces peak radiated emissions by up to 20dB in CISPR 25 Class 5 tests. |
| Fast Transient Response | Peak-current-mode control with internal compensation achieves <10µs recovery from 0.5A→1A load step. |
| Robust Thermal Performance | LQFN package with exposed pad achieves 41°C/W θJA on demo board, supporting 1.5A continuous at 70°C ambient. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powering 3.3V MCU, CAN transceiver, and audio codec in head unit under cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 12V→3.3V buck converter with UVLO, PG signaling, and EMI compliance for ISO 11452-2/25. Use Value: 35ns min-on-time prevents dropout during cold-crank; Silent Switcher 2 meets OEM radiated emission limits without layout iteration. |
Use Scenario: Regulating 5V from 24V field bus to power low-power RTD sensor interface and LoRaWAN radio in predictive maintenance node. IC Role / Device Role / Timing Role: High-efficiency, low-IQ step-down regulator enabling multi-year battery operation with periodic wake-up bursts. Use Value: 1.7µA quiescent current extends 2×AA battery life beyond 8 years; ±8% PG accuracy ensures clean MCU reset on brownout. |
| Medical Portable Diagnostic Device | Smart Building Controller |
|
Use Scenario: Generating stable 3.3V rail for ADC, op-amps, and Bluetooth LE SoC in handheld ultrasound probe powered by Li-ion battery. IC Role / Device Role / Timing Role: Main system power supply with soft-start (TR/SS) for controlled voltage ramp and low-noise operation. Use Value: <10mVP-P ripple in Burst Mode avoids ADC quantization noise; 2.2MHz switching enables <2.2µH inductor for ultra-compact PCB area. |
Use Scenario: Converting 48V PoE++ input to 5V for HVAC controller MCU, RS-485 transceivers, and relay drivers in commercial building automation. IC Role / Device Role / Timing Role: Wide-input buck regulator with spread-spectrum SYNC for EMC compliance in dense wiring environments. Use Value: 42V absolute max rating handles PoE++ surges; spread-spectrum modulation eliminates narrowband EMI peaks interfering with wireless comms. |
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 |
|---|---|---|---|
| LT8609SIV#TRPBF | Same 12-lead LQFN package, but rated for 2A output and higher 3.5A current limit; 2.5µA IQ. | Supports higher load currents (e.g., dual-core MCU + Ethernet PHY) where LT8608SIV#TRPBF hits 1.5A thermal limit. | Select LT8609SIV#TRPBF when output current exceeds 1.3A continuously or peak loads exceed 1.8A. |
| TPS62865ARGRR | 2.5V–6V input range only; 4A output; 250nA IQ; 2mm × 2mm WSON-12 package; no spread-spectrum or PG pin. | Optimized for single-cell Li-ion (3.0–4.2V) portable apps; lacks automotive-grade voltage range and EMI features. | Choose TPS62865ARGRR only for low-voltage, ultra-low-IQ consumer wearables-not for 12V+ industrial or automotive use. |
Compared with LT8608SIV#TRPBF, LT8609SIV#TRPBF offers higher current headroom at minor IQ cost, while TPS62865ARGRR trades wide VIN and EMI robustness for extreme ultralow IQ in narrow-input applications.
Availability
LT8608SIV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor nodes, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges.
Supply support for LT8608SIV#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, and automotive safety markets.
The LT8608SIV#TRPBF belongs to the Silent Switcher® 2 DC/DC regulator product line, engineered specifically for ultralow EMI and high efficiency in space-constrained, noise-sensitive applications like ADAS cameras and battery-powered sensors.
FAQ
What is the maximum input voltage rating for LT8608SIV#TRPBF?
The LT8608SIV#TRPBF has an absolute maximum input voltage rating of 42V, verified per Analog Devices' Absolute Maximum Ratings table. This allows direct connection to 24V industrial buses and 36V automotive systems, including transient load-dump events. Operation above 42V risks permanent damage; design margin should maintain VIN ≤ 40V under worst-case conditions. The LT8608SIV#TRPBF's internal protection circuits do not override this hard voltage limit.
How does LT8608SIV#TRPBF achieve ultralow quiescent current in Burst Mode?
The LT8608SIV#TRPBF achieves 1.7µA quiescent current in Burst Mode by disabling all non-essential circuitry-including gate drivers, oscillator, and error amplifier-between output pulses, leaving only the bandgap reference and PG comparator active. Each burst delivers a small current pulse to recharge the output capacitor, then enters deep sleep. At no load, this yields ~3µA total input current in typical applications. The LT8608SIV#TRPBF's dedicated low-power architecture avoids leakage paths that increase IQ in conventional buck controllers.
Can LT8608SIV#TRPBF synchronize to an external clock, and what are the voltage requirements?
Yes, LT8608SIV#TRPBF supports external clock synchronization via the SYNC pin. For reliable locking, the external clock must swing between 0.4V (low) and 2.7–3.2V (high) with rise/fall times <50ns. Clock frequencies from 200kHz to 2.2MHz are accepted; frequencies outside this range may cause unstable operation or fallback to internal oscillator. The LT8608SIV#TRPBF does not require level-shifting-standard 3.3V CMOS clocks interface directly.
What is the purpose of the exposed pad (Pin 13) on LT8608SIV#TRPBF, and how must it be connected?
The exposed pad (Pin 13) on LT8608SIV#TRPBF is electrically and thermally connected to GND and must be soldered to a dedicated PCB copper pour tied to the input/output capacitor ground planes. This reduces thermal resistance (θJA = 41°C/W on demo board vs. 58°C/W on JEDEC board) and provides a low-inductance return path for high-frequency switch currents, critical for Silent Switcher® 2 EMI performance. Leaving it unconnected degrades thermal and EMC performance and violates Analog Devices' assembly guidelines for LT8608SIV#TRPBF.
Does LT8608SIV#TRPBF support output voltage tracking, and how is it implemented?
Yes, LT8608SIV#TRPBF supports output voltage tracking via the TR/SS pin. When TR/SS voltage is below 0.774V, the FB pin is forced to track TR/SS, enabling precise sequencing with other regulators. A capacitor from TR/SS to GND sets the slew rate; for example, 10nF yields ~1V/ms ramp. During normal regulation (TR/SS > 0.774V), the internal 0.774V reference resumes control. This dual-mode behavior is intrinsic to LT8608SIV#TRPBF's architecture and requires no external components beyond the timing capacitor.
LT8608SIV#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT8608SIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608SIV#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 LT8608SIV#TRPBF reliable?
The price and inventory of LT8608SIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608SIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608SIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608SIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608SIV#TRPBF?
LT8608SIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608SIV#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 LT8608SIV#TRPBF?
For technical support, including LT8608SIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608SIV#TRPBF requirements.
6.How does Aetrix verify that LT8608SIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608SIV#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 LT8608SIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608SIV#TRPBF?
All LT8608SIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608SIV#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 LT8608SIV#TRPBF part is unused and in its original packaging.
Return procedure for LT8608SIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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