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Analog Devices Inc. LT8608BIDC#TRPBF
- Part No.:
- LT8608BIDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608BIDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,129
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Product details
Overview
LT8608BIDC#TRPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator in an 8-lead 2mm × 2mm DFN package, featuring pulse-skipping mode, 2.5µA quiescent current at no load (12VIN→3.3VOUT), <10mVP-P output ripple, and 35ns minimum on-time. It delivers high efficiency (>92% at 0.5A, 5VOUT from 12VIN) for automotive infotainment power rails and industrial sensor nodes requiring ultralow IQ and wide VIN range.
For engineers reviewing the LT8608BIDC#TRPBF datasheet, LT8608BIDC#TRPBF pinout, LT8608BIDC#TRPBF application, or LT8608BIDC#TRPBF equivalent, key selection criteria include confirmed pulse-skipping-only operation (no SYNC pin), fixed DFN-8 package with exposed pad, 0.773–0.783V feedback reference, ±8.5% PG threshold accuracy, and guaranteed –40°C to 125°C junction temperature operation.
Technical Context
The LT8608BIDC#TRPBF uses peak current mode control with internal compensation, enabling fast transient response and stable loop behavior with small external inductors. Its pulse-skipping mode-hardwired in the DFN variant-maintains continuous oscillator operation and clock-aligned switching, differing fundamentally from Burst Mode in quiescent current profile and EMI signature.
Unlike the MSOP version, this DFN-8 variant omits SYNC and TR/SS pins; the SYNC node is internally floated to enable pulse-skipping, and TR/SS is unconnected. The device implements frequency foldback during start-up and undervoltage lockout via EN/UV (1.05V rising threshold) to ensure robust power sequencing in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct battery connection in 12V/24V automotive systems without pre-regulation. |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >10-year battery life in always-on IoT sensors. |
| Output Ripple | <10mVP-P - meets low-noise analog supply requirements for ADCs and RF front-ends. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of inductor size vs. efficiency trade-off. |
| Feedback Reference | 0.773–0.783V (DFN package) - sets output voltage accuracy; requires 1% resistors for ≤1% VOUT error. |
| Power Switch RDS(ON) | Top: 350mΩ, Bottom: 230mΩ - enables high efficiency at 1.5A continuous load with minimal thermal derating. |
| PG Accuracy | ±8.5% of VFB - provides reliable power-good signaling for FPGA/CPU reset sequencing. |
Pinout & Package
LT8608BIDC#TRPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9 = GND). The package lacks SYNC and TR/SS pins; SYNC is internally floated to enforce pulse-skipping operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate drive voltage >VIN for top MOSFET; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in PCB area to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Requires ≥1µF low-ESR ceramic capacitor to ground; powers internal logic and drivers; not for external loading. |
| EN/UV | Enable / input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; resistor divider from VIN programs custom UVLO point. |
| VIN | Main input supply | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR capacitor near VIN/GND pins. |
| PG | Power-good open-drain flag | Pulls low when VOUT deviates >±8.5% from regulation or fault occurs; valid above 3.2V VIN regardless of EN state. |
| FB | Feedback input | Regulated to 0.773–0.783V; connects to resistor divider tap; 10pF phase-lead cap recommended with high-value dividers. |
| GND | Ground / thermal pad | Exposed pad (Pin 9) must be soldered to PCB ground plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode (fixed) | Enables continuous oscillator operation and clock-aligned switching for predictable EMI spectrum and reduced light-load output voltage deviation vs. Burst Mode. |
| 35ns minimum on-time | Supports high VIN/VOUT ratios (e.g., 42V→3.3V) at 2MHz switching without cycle skipping, preserving regulation stability. |
| Internal compensation | Eliminates external compensation components, reducing BOM count and layout sensitivity while maintaining loop stability across operating conditions. |
| Accurate 1V EN/UV threshold | Enables precise input UVLO programming (e.g., 9V cutoff for 12V battery systems) with 50mV hysteresis to prevent chatter during brownout. |
| Thermal shutdown protection | Activates above 150°C junction temperature to prevent damage during overload or poor heatsinking; allows safe recovery after cooldown. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering display controllers and audio codecs in vehicle head units with 12V battery input subject to cold-crank dips. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator delivering 1.5A with ultralow IQ to extend backup battery life during ignition-off states. Use Value: 2.5µA quiescent current prevents parasitic drain; 42V absolute max rating withstands load-dump transients up to 40V. | Use Scenario: Providing regulated 3.3V for wireless sensor transceivers (LoRa, NB-IoT) deployed in remote field locations with coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: Always-on DC/DC converter maintaining rail integrity during multi-year deployments with intermittent wake-up cycles. Use Value: <10mVP-P ripple ensures clean ADC reference; pulse-skipping mode avoids Burst Mode's variable-frequency EMI that interferes with narrowband RF reception. |
| Medical Portable Monitor Rail | Test & Measurement Instrumentation |
Use Scenario: Generating low-noise 5V supply for precision analog front-ends in handheld ECG or pulse oximeter devices. IC Role / Device Role / Timing Role: Secondary regulator downstream of main battery management IC, supplying critical analog signal chain components. Use Value: Internal compensation and peak current mode control deliver fast transient response to dynamic load steps from ADC sampling bursts. | Use Scenario: Powering FPGA configuration and I/O banks in benchtop analyzers requiring stable 1.8V/3.3V rails with minimal board space. IC Role / Device Role / Timing Role: Compact, high-efficiency point-of-load regulator replacing discrete buck solutions to meet tight thermal and footprint constraints. Use Value: 2mm × 2mm DFN package with exposed pad achieves 40°C/W θJA, enabling 1.5A delivery without forced air cooling. |
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 |
|---|---|---|---|
| LT8608EDC#TRPBF | Burst Mode only (SYNC internally grounded); same DFN-8 package and 0.778V FB reference. | Suitable where lowest possible IQ (<2.5µA) is mandatory and EMI spread-spectrum is not required. | Select LT8608EDC#TRPBF if system prioritizes ultralow standby power over EMI predictability. |
| LT8609SIDD#TRPBF | Higher 2A output current, 40V max VIN, integrated spread-spectrum modulation, same DFN-8 package. | Required for higher load currents or stricter CISPR-22/32 EMI compliance in industrial equipment. | Choose LT8609SIDD#TRPBF when scaling output current beyond 1.5A or needing certified low-EMI operation. |
Compared with LT8608EDC#TRPBF, the LT8608BIDC#TRPBF trades lower quiescent current for deterministic pulse-skipping timing and better light-load voltage regulation; versus LT8609SIDD#TRPBF, it offers lower cost and simpler layout at the expense of current capability and built-in spread-spectrum.
Availability
LT8608BIDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, portable medical monitors, and test & measurement instrumentation requiring stable component supply with guaranteed –40°C to 125°C operation.
Supply support for LT8608BIDC#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 industrial, automotive, communications, and healthcare markets.
The LT8608/LT8608B product line delivers ultralow-quiescent-current synchronous buck regulators optimized for battery-powered and automotive applications demanding wide input range, high efficiency, and compact solution size.
FAQ
What distinguishes LT8608BIDC#TRPBF from the standard LT8608 DFN variant?
The LT8608BIDC#TRPBF is specifically configured for pulse-skipping mode operation, with its SYNC pin internally floated. In contrast, the LT8608EDC#TRPBF has SYNC internally grounded to force Burst Mode. Both share the same DFN-8 package, 1.5A rating, and 42V max input, but differ in light-load behavior, quiescent current profile, and EMI characteristics. The LT8608BIDC#TRPBF draws several hundred µA in pulse-skipping versus ~2.5µA in Burst Mode.
Does LT8608BIDC#TRPBF support external frequency synchronization?
No. The LT8608BIDC#TRPBF does not support external synchronization because it lacks a functional SYNC pin - the pin is omitted in the DFN-8 package, and the internal node is floated to enforce pulse-skipping mode. For sync-capable operation, the MSOP-10 variants (e.g., LT8608IMSE#TRPBF) must be used. Attempting to synchronize the LT8608BIDC#TRPBF is not possible by design.
What is the guaranteed operating temperature range for LT8608BIDC#TRPBF?
The LT8608BIDC#TRPBF is rated for –40°C to 125°C junction temperature operation. This is the "I" grade, verified across the full range per Analog Devices' characterization and statistical process controls. It is suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 85°C, provided proper PCB thermal design (exposed pad soldering) is implemented.
Can LT8608BIDC#TRPBF be used in 48V automotive systems?
No. The LT8608BIDC#TRPBF has an absolute maximum input voltage rating of 42V, making it unsuitable for sustained 48V nominal systems. While it may survive brief transients up to 42V, continuous operation above 42V violates Absolute Maximum Ratings and risks permanent damage. For 48V applications, consider higher-voltage alternatives such as the LT8640S (60V) or LT8645S (65V) families.
How is output voltage programmed on LT8608BIDC#TRPBF?
Output voltage is set using a resistor divider between VOUT and FB, targeting the DFN-specific feedback reference of 0.773–0.783V. The formula is R1 = R2 × (VOUT / 0.778 − 1). Use 1% tolerance resistors and keep total divider current ≤10µA to preserve ultralow IQ. For high-resistance dividers (>1MΩ), add a 10pF capacitor from VOUT to FB to maintain phase margin.
LT8608BIDC#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 ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608BIDC#TRPBF FAQ
1.How can I place an order for LT8608BIDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608BIDC#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 LT8608BIDC#TRPBF reliable?
The price and inventory of LT8608BIDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608BIDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608BIDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608BIDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608BIDC#TRPBF?
LT8608BIDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608BIDC#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 LT8608BIDC#TRPBF?
For technical support, including LT8608BIDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608BIDC#TRPBF requirements.
6.How does Aetrix verify that LT8608BIDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608BIDC#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 LT8608BIDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608BIDC#TRPBF?
All LT8608BIDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608BIDC#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 LT8608BIDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8608BIDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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