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Analog Devices Inc. LT8608IDC#TRMPBF
- Part No.:
- LT8608IDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608IDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,559
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Product details
Overview
LT8608IDC#TRMPBF 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, 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 layout are critical.
For engineers reviewing the LT8608IDC#TRMPBF datasheet, LT8608IDC#TRMPBF pinout, LT8608IDC#TRMPBF application, or LT8608IDC#TRMPBF 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 due to absence of SYNC/ TR/SS pins in the DFN variant.
Technical Context
The LT8608IDC#TRMPBF implements peak current mode control with internal compensation, enabling stable operation with small external inductors and fast load-step response. Its 35ns minimum on-time supports high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping instability.
Burst Mode operation is hardwired-no SYNC or TR/SS pins-delivering <10mVP-P ripple at light loads while maintaining 2.5µA total input quiescent current. The FB reference is trimmed to 0.778V (±0.025V over temperature), and EN/UV has a precise 1.05V rising threshold with 50mV hysteresis for reliable undervoltage lockout.
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. |
| Quiescent Current | 2.5µA at no load - enables >10-year battery life in always-on telematics modules. |
| Output Current | 1.5A continuous - sustains full load under worst-case thermal conditions (TJ ≤ 125°C). |
| Feedback Reference | 0.778V ±0.025V - ensures ±1.2% output accuracy with 1% resistors across –40°C to 125°C. |
| Min On-Time | 35ns - allows 36V→3.3V conversion at 2MHz without duty-cycle limitation or frequency foldback. |
| Power-Good Threshold | ±8.5% of VOUT - provides robust startup and fault detection with hysteresis for noise immunity. |
| Package | 8-lead 2mm × 2mm DFN - exposes thermal pad for low θJA (40°C/W typical) and PCB area <4mm². |
Pinout & Package
LT8608IDC#TRMPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9 = GND). The package omits SYNC and TR/SS pins-Burst Mode operation is factory-configured and non-adjustable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed-critical for 100% duty-cycle capability. |
| SW | Switch node connecting internal top/bottom FETs to inductor | High di/dt node; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading-powers gate drivers and logic. |
| RT | Resistor-programmed oscillator frequency input | Connects to ground via resistor (e.g., 18.2kΩ sets 2MHz); determines minimum off-time and loop bandwidth. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold; 50mV hysteresis prevents chatter during brownout; ties to VIN if always-on. |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor; feeds internal circuitry and top switch. |
| PG | Open-drain power-good flag | Pulls low when VOUT 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-total resistance impacts light-load IQ. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery energy in always-on systems. |
| 35ns Minimum On-Time | Enables high step-down ratios (e.g., 36V→3.3V) at 2MHz without cycle skipping or instability. |
| Integrated Power Switches | Top/bottom NMOS with 350mΩ/230mΩ RDS(ON) deliver >92% efficiency at 0.5A (12VIN→5VOUT). |
| Robust PG Flag | ±8.5% accuracy with fault detection ensures safe sequencing in multi-rail power systems. |
| Internal Compensation | Eliminates external compensation components-reduces BOM count and design iteration time. |
Applications
| Automotive Infotainment Core Rail | Industrial IoT Sensor Node Power |
|---|---|
Use Scenario: Powers SoC core voltage (e.g., 1.2V/1.8V) from 12V vehicle battery with strict 20µA sleep budget. IC Role / Device Role / Timing Role: Primary DC/DC buck regulator delivering stable 1.2V/1.8V at up to 1.5A with programmable UVLO. Use Value: 2.5µA quiescent current extends battery backup runtime beyond 5 years in parked-state monitoring. | Use Scenario: Supplies 3.3V to LoRaWAN sensor nodes operating on coin-cell batteries for 10+ years. IC Role / Device Role / Timing Role: Standby-optimized step-down converter with integrated PG for MCU reset coordination. Use Value: <10mVP-P output ripple in Burst Mode avoids ADC measurement errors during wake-up sampling. |
| Portable Medical Diagnostic Device | Ruggedized Telematics Control Unit |
Use Scenario: Generates 5V rail for FPGA and analog front-end in handheld ultrasound units with Li-ion battery input. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator supporting 3.0V–42V input transients during vehicle cranking. Use Value: 42V absolute max rating and 35ns min on-time prevent dropout during 36V cold-crank pulses. | Use Scenario: Provides 3.3V system rail in GPS tracking units mounted in engine compartments (–40°C to +125°C). IC Role / Device Role / Timing Role: Automotive-grade (I-temp) buck converter with thermal pad soldered to PCB for conduction cooling. Use Value: Guaranteed operation to 125°C junction temperature enables placement near heat sources without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIDD#TRMPBF | Same DFN-8 package, 2A output, 2.5µA IQ, but adds spread-spectrum EMI reduction and adjustable soft-start. | Preferred for noise-sensitive RF sections; requires additional 10nF SS capacitor. | Select when EMI compliance (CISPR 25 Class 5) is mandatory and 2A output headroom is needed. |
| TPS54340DDAR | 3.5A output, 4.5µA IQ, SO-8 package, no integrated bottom FET-external diode required for sync operation. | Higher output current but larger footprint and higher light-load IQ compromises battery life. | Choose for cost-sensitive industrial designs where 3.5A peak load justifies larger size and higher standby loss. |
Compared with LT8609SIDD#TRMPBF, LT8608IDC#TRMPBF offers lower cost and identical footprint but lacks spread-spectrum and soft-start adjustability; versus TPS54340DDAR, it delivers superior light-load efficiency and smaller solution size despite lower current rating.
Availability
LT8608IDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment core rails, industrial IoT sensor nodes, portable medical diagnostics, ruggedized telematics control units, and portable test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LT8608IDC#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 precision instrumentation, communications, and industrial markets since 1965.
The LT8608 family is designed for ultra-low-quiescent-current, high-input-voltage DC/DC conversion in space-constrained, battery-sensitive applications such as automotive subsystems and portable electronics.
FAQ
What is the guaranteed operating temperature range for LT8608IDC#TRMPBF?
The LT8608IDC#TRMPBF is rated for –40°C to +125°C junction temperature and is qualified to the Industrial temperature grade (I-temp). This specification is guaranteed across the full range, with thermal performance validated via characterization and statistical process controls-not just design simulation.
Does LT8608IDC#TRMPBF support external frequency synchronization?
No. The LT8608IDC#TRMPBF is the DFN-package variant with no SYNC pin; it operates exclusively in fixed Burst Mode. Synchronization is only available on MSOP-package versions (e.g., LT8608IMSE#TRPBF) which include the SYNC pin.
What is the feedback reference voltage tolerance of LT8608IDC#TRMPBF over temperature?
The LT8608IDC#TRMPBF has a feedback reference voltage of 0.778V with ±0.025V (±3.2%) tolerance over the full –40°C to +125°C operating junction temperature range, ensuring ±1.2% output accuracy when using 1% feedback resistors.
Can LT8608IDC#TRMPBF be used in 36V automotive cold-crank applications?
Yes. With 42V absolute maximum input rating, 35ns minimum on-time, and guaranteed operation down to 3.0V input, the LT8608IDC#TRMPBF maintains regulation during 36V cold-crank transients while delivering full 1.5A output without frequency foldback or dropout.
How does the absence of TR/SS and SYNC pins affect LT8608IDC#TRMPBF functionality?
The LT8608IDC#TRMPBF permanently configures Burst Mode operation and disables soft-start adjustment or output tracking. All timing and modulation features dependent on those pins-including external sync, spread spectrum, and programmable slew rate-are unavailable in this DFN variant.
LT8608IDC#TRMPBF 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)
LT8608IDC#TRMPBF FAQ
1.How can I place an order for LT8608IDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608IDC#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 LT8608IDC#TRMPBF reliable?
The price and inventory of LT8608IDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608IDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608IDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608IDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608IDC#TRMPBF?
LT8608IDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608IDC#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 LT8608IDC#TRMPBF?
For technical support, including LT8608IDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608IDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608IDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608IDC#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 LT8608IDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608IDC#TRMPBF?
All LT8608IDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608IDC#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 LT8608IDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608IDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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