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Analog Devices Inc. LT8608EDC#TRPBF
- Part No.:
- LT8608EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608EDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,252
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Product details
Overview
LT8608EDC#TRPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator in an 8-lead 2mm × 2mm DFN package, featuring 2.5µA quiescent current in Burst Mode operation, 35ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 3.3V or 5V output in automotive infotainment power rails where ultra-low standby power and compact size are critical.
For engineers reviewing the LT8608EDC#TRPBF datasheet, LT8608EDC#TRPBF pinout, LT8608EDC#TRPBF application, or LT8608EDC#TRPBF equivalent, key selection criteria include input voltage range (3.0V–42V), guaranteed 1.5A continuous output, ±8.5% power-good accuracy, and fixed Burst Mode operation without SYNC/TR/SS pins - essential for low-EMI battery-powered systems requiring long shelf life.
Technical Context
The LT8608EDC#TRPBF implements peak current mode control with internal 0.778V feedback reference and frequency-programmable oscillator (200kHz–2.2MHz via RT resistor). Its monolithic architecture integrates top/bottom NMOS switches (350mΩ/230mΩ RDS(ON)) and eliminates external compensation components.
Burst Mode operation enables regulation at no-load with <2.5µA input current while maintaining <10mVP-P output ripple; the DFN variant permanently configures Burst Mode by internally grounding the SYNC pin, disabling synchronization, spread-spectrum, and pulse-skipping functionality present in MSOP versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct connection to automotive battery (cold-crank down to 3.0V) and industrial 24V/36V rails |
| Quiescent Current | 2.5µA typical at no load - enables >10-year battery life in always-on telematics modules |
| Continuous Output Current | 1.5A - sufficient for powering dual-core microcontrollers, CAN transceivers, and display drivers |
| Feedback Reference Voltage | 0.778V ±12mV - sets output accuracy; used with resistor divider to generate 3.3V/5V/12V outputs |
| Minimum On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse skipping or frequency foldback |
| Power-Good Accuracy | ±8.5% of VOUT - provides reliable system reset signaling during brownout conditions |
| Switching Frequency Range | 200kHz to 2.2MHz - allows optimization of inductor size (e.g., 2.2µH at 2MHz) and EMI filtering |
Pinout & Package
LT8608EDC#TRPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9 = GND). The package omits SYNC and TR/SS pins, fixing Burst Mode operation and eliminating soft-start/tracking capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; enables efficient 100% duty-cycle operation |
| SW | Switch node connecting internal FETs to external inductor | High dv/dt node; must be minimized in PCB layout to reduce EMI and switching losses |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor to GND for stable gate drive |
| RT | Resistor-based oscillator frequency programming | Connects to GND via resistor (e.g., 18.2kΩ for 2MHz); sets switching frequency without external clock |
| EN/UV | Enable and input undervoltage lockout control | 1.05V rising threshold; enables programmable VIN UVLO using external resistor divider |
| VIN | Main input power supply | Supplies IC bias and high-side switch; requires local 1µF ceramic + bulk capacitor |
| PG | Open-drain power-good status flag | Pulls low when VFB deviates >±8.5% or fault occurs; valid above 3.2V VIN regardless of EN state |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; connects to resistor divider tap to set VOUT precisely |
| GND | Power and signal ground reference | Exposed pad (Pin 9) must be soldered to PCB ground plane for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA at no load enables >10-year battery backup in always-on automotive modules |
| Integrated power switches | 350mΩ top / 230mΩ bottom NMOS eliminate external MOSFETs and reduce BOM count |
| Internal compensation | Eliminates external compensation network - reduces design time and board space |
| Fast transient response | Peak current mode control with 35ns min on-time maintains regulation during rapid load steps |
| Robust protection suite | Includes overtemperature shutdown, PG fault detection, and accurate EN/UV hysteresis (50mV) |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering DSP, touchscreen controller, and audio codec in head unit with 12V battery input and strict 20µA sleep budget. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering 1.5A peak current with Burst Mode enabling sub-µA standby draw. Use Value: Extends vehicle battery life during extended parking; meets ISO 16750-2 cold-crank (3.0V) and load-dump (42V) requirements. | Use Scenario: Regulating 3.3V for LoRaWAN sensor node powered by primary lithium thionyl chloride cell (3.6V nominal, 20-year shelf life). IC Role / Device Role / Timing Role: Always-on DC/DC converter maintaining precise 3.3V rail during 10-second wake cycles every 10 minutes. Use Value: 2.5µA quiescent current ensures >15-year operational lifetime; 35ns on-time supports wide input range as battery discharges to 3.0V. |
| Medical Portable Monitor | Railway Signaling Interface |
Use Scenario: Generating clean 5V supply for ECG front-end ADC and Bluetooth LE radio in battery-operated patient monitor. IC Role / Device Role / Timing Role: Low-noise synchronous buck providing regulated 5V with <10mVP-P ripple in Burst Mode to preserve signal integrity. Use Value: Meets IEC 60601-1 leakage current limits; internal compensation avoids noise-sensitive external RC networks. | Use Scenario: Converting 72V train battery to 5V logic supply for isolated CAN transceiver in wayside signaling box. IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating reliably across 40V–110V input range with 42V absolute max rating. Use Value: 42V max rating withstands 110V transients per EN 50121-3-2; 1.5A output supports multiple isolated interfaces simultaneously. |
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 |
|---|---|---|---|
| LT8609EDC#TRPBF | Same DFN package, 2A output current, 2.5µA IQ, but adds spread-spectrum modulation and improved light-load efficiency | Preferred for new designs requiring lower EMI in dense PCB layouts or higher current headroom | Select LT8609EDC#TRPBF if output current >1.5A or EMI compliance (CISPR 25 Class 5) is mandatory |
| MPQ4420AGL-A-Z | Monolithic 42V/2A buck, 17µA IQ (Burst Mode), no PG flag, 100ns min on-time, QFN-10 package | Lacks power-good reporting and has higher quiescent current - suitable only where PG is not safety-critical | Choose MPQ4420AGL-A-Z only for cost-sensitive industrial applications without functional safety requirements |
Compared with LT8608EDC#TRPBF, LT8609EDC#TRPBF offers higher current and EMI reduction at minimal footprint cost, while MPQ4420AGL-A-Z trades off PG functionality and ultra-low IQ for lower unit price - making LT8608EDC#TRPBF optimal for legacy automotive designs needing exact 1.5A/2.5µA/PG compliance.
Availability
LT8608EDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, portable medical monitors, and railway signaling interfaces requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8608EDC#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 markets.
The LT8608/LT8608B product line delivers ultralow-IQ synchronous buck regulators optimized for battery-powered and automotive systems where standby power, small solution size, and robustness across wide input voltage ranges are critical.
FAQ
What is the maximum input voltage rating for LT8608EDC#TRPBF?
The LT8608EDC#TRPBF has an absolute maximum input voltage rating of 42V, verified per Analog Devices' Rev. D datasheet Absolute Maximum Ratings table. This allows direct connection to 24V/36V industrial rails and automotive batteries under load-dump conditions. Operation above 42V risks permanent damage; the device includes internal VIN UVLO that activates below 3.2V to prevent malfunction during cold-crank events.
Does LT8608EDC#TRPBF support external frequency synchronization?
No, LT8608EDC#TRPBF does not support external frequency synchronization. As a DFN-package variant, it permanently configures Burst Mode operation by internally grounding the SYNC pin - unlike MSOP versions which expose SYNC for clock alignment or spread-spectrum modulation. This simplifies layout but removes EMI tuning capability.
What is the feedback reference voltage of LT8608EDC#TRPBF and how is output voltage set?
The LT8608EDC#TRPBF regulates the FB pin to a precise 0.778V reference (±12mV over temperature). Output voltage is set using a resistor divider: R1 = R2 × (VOUT/0.778V − 1). For example, a 3.3V output requires R2 = 100kΩ and R1 = 324kΩ (1% tolerance). Larger resistor values minimize divider current to preserve ultralow quiescent current.
Can LT8608EDC#TRPBF operate in dropout mode, and what is its minimum dropout voltage?
Yes, LT8608EDC#TRPBF supports near-100% duty cycle operation for dropout conditions. At 1.5A load and 3.3V output, dropout voltage is approximately 500mV (dominated by top FET RDS(ON) × ILOAD). The datasheet confirms operation down to 3.0V input, enabling regulation from 3.3V output even as input sags to 3.8V - critical for automotive cold-crank scenarios.
What thermal management requirements apply to LT8608EDC#TRPBF in high-current operation?
LT8608EDC#TRPBF requires soldering of its exposed thermal pad (Pin 9) to a dedicated PCB ground plane for effective heat dissipation. At 1.5A continuous load and 12V input, case temperature rise is ~45°C above ambient (per Figure G24/G25). Use ≥2 cm² copper area under the DFN and thermal vias to inner layers to maintain junction temperature below 125°C in sealed enclosures.
LT8608EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.778V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608EDC#TRPBF FAQ
1.How can I place an order for LT8608EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608EDC#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 LT8608EDC#TRPBF reliable?
The price and inventory of LT8608EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608EDC#TRPBF?
LT8608EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608EDC#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 LT8608EDC#TRPBF?
For technical support, including LT8608EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608EDC#TRPBF requirements.
6.How does Aetrix verify that LT8608EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608EDC#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 LT8608EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608EDC#TRPBF?
All LT8608EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608EDC#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 LT8608EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8608EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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