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Analog Devices Inc. LT8608IDC#TRPBF
- Part No.:
- LT8608IDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608IDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
LT8608IDC#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/5V outputs in automotive infotainment power rails and industrial sensor nodes where ultra-low standby power is critical.
For engineers reviewing the LT8608IDC#TRPBF datasheet, LT8608IDC#TRPBF pinout, LT8608IDC#TRPBF application, or LT8608IDC#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the LT8608IDC#TRPBF DFN variant.
Technical Context
The LT8608IDC#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its fixed Burst Mode operation (no SYNC pin) maintains output ripple below 10mVP-P while drawing only 1.7µA at no load and 2.5µA typical in regulation - critical for battery-backed systems.
This DFN variant lacks TR/SS and SYNC pins, eliminating soft-start programming and external synchronization. It uses a 0.773V feedback reference (typical), supports input voltages from 3.0V to 42V, and integrates top/bottom NMOS switches with 350mΩ/230mΩ RDS(ON), enabling high efficiency (>92% at 0.5A, 5VOUT from 12VIN) at 2MHz switching.
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 3.2V) without pre-regulation. |
| Quiescent Current | 2.5µA typical at no load - enables >10-year battery life in always-on IoT sensors with 200mAh coin cell. |
| Output Current | 1.5A continuous - sufficient to power dual-core microcontrollers, CAN transceivers, and analog front-ends simultaneously. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows 2.2µH inductor selection for compact 5V/1A designs at 2MHz. |
| Feedback Reference | 0.773V (DFN typ.) - sets output voltage via resistor divider; 1% resistors yield ±1.2% VOUT accuracy over temp. |
| Min On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping instability. |
| PG Accuracy | ±8.5% output window - provides reliable power-good signaling for FPGA configuration sequencing. |
Pinout & Package
LT8608IDC#TRPBF uses an 8-lead, 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The package has no SYNC or TR/SS pins - Burst Mode operation is fixed and non-configurable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 0.1µF ceramic cap placed adjacent to IC for reliable 35ns on-time. |
| SW | Switch node | Connects to inductor and BST cap; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Requires ≥1µF low-ESR ceramic to ground; powers internal logic/drivers - not for external loading. |
| RT | Frequency setting resistor | Ties to GND; 18.2kΩ sets 2MHz - critical for optimizing inductor size and light-load efficiency trade-off. |
| EN/UV | Enable / input undervoltage lockout | 1.05V rising threshold; used to disable converter below battery brownout (e.g., 6V cutoff with resistor divider). |
| VIN | Main input supply | Accepts 3.0–42V; must be locally bypassed with low-ESR capacitor tied directly to GND pad. |
| PG | Power-good open-drain flag | Pulls low until VOUT settles within ±8.5%; drives microcontroller reset or enable lines directly. |
| FB | Feedback input | Regulated to 0.773V; connects to resistor divider tap - determines output voltage with minimal divider current. |
| GND | Power and signal ground | Exposed pad (Pin 9); must be soldered to large PCB copper area for thermal management and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA typical no-load current enables >10-year shelf life in battery-powered remote sensors. |
| Integrated Power Switches | 350mΩ top / 230mΩ bottom NMOS eliminates external MOSFETs and gate drivers - reduces BOM count by 4 components. |
| Fast Minimum On-Time | 35ns enables high step-down ratios (e.g., 36V→3.3V at 2MHz) without requiring external frequency reduction. |
| Internal Compensation | Eliminates external compensation network - simplifies layout and ensures stability across all operating conditions. |
| Accurate EN/UV Threshold | 1.05V ±50mV hysteresis allows precise battery undervoltage cutoff without external comparators. |
Applications
| Automotive Body Control Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering CAN FD transceiver, MCU, and temperature/humidity sensor from 12V vehicle battery with cold-crank survival. IC Role / Device Role / Timing Role: Primary 3.3V/1.5A step-down regulator with ultralow IQ to maintain RTC and wake-up circuitry during ignition-off. Use Value: 2.5µA quiescent current prevents battery drain below 10mA/month - meets OEM parasitic draw requirements. |
Use Scenario: Solar-charged remote environmental monitor operating 24/7 in unattended locations. IC Role / Device Role / Timing Role: Main 5V→3.3V regulator for ESP32-WROVER and LoRa transceiver, entering deep sleep between transmissions. Use Value: Burst Mode maintains <10mVP-P ripple during sleep while consuming less than 2.5µA - extends solar recharge cycle by 3×. |
| Railway Signaling Interface | Medical Point-of-Care Device |
Use Scenario: Converting 24VDC track power to isolated 5V for optocoupled I/O and microcontroller in wayside equipment. IC Role / Device Role / Timing Role: Non-isolated primary DC/DC stage delivering 1.5A with input surge tolerance up to 42V. Use Value: 42V absolute max rating and 35ns min on-time ensure reliable startup during 36V transients per EN 50155. |
Use Scenario: Battery-powered handheld diagnostic tool requiring quiet, low-noise 3.3V rail for ADC and touch controller. IC Role / Device Role / Timing Role: Low-EMI step-down regulator using 2MHz switching and integrated FETs to avoid discrete switch noise coupling. Use Value: Spread-spectrum-free Burst Mode (fixed in DFN) reduces conducted EMI peaks - simplifies EMC pre-compliance testing. |
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#TRPBF | Same DFN-8 package, 2A output, 2.5µA IQ, but adds spread-spectrum modulation and improved EMI performance. | Preferred for medical/industrial designs requiring Class B CISPR 22 compliance without added filters. | Select when higher output current (2A) and certified low-EMI operation justify $0.35/unit premium. |
| MPQ4420AGL-AEC1-Z | Automotive-grade (AEC-Q100), 2A, 17µA IQ, 3.3–36V input - no Burst Mode, higher light-load IQ. | Suitable for under-hood modules where AEC-Q100 qualification is mandatory and standby current <5µA is not required. | Choose only if AEC-Q100 certification is contractually required and system can tolerate 17µA vs. 2.5µA no-load current. |
Compared with LT8608IDC#TRPBF, LT8609SIDD#TRPBF offers higher current and EMI control at modest cost increase, while MPQ4420AGL-AEC1-Z trades ultralow IQ for automotive qualification - neither is pin-compatible, but both fit same 2mm × 2mm footprint with minor layout updates.
Availability
LT8608IDC#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, railway signaling interfaces, and medical point-of-care devices requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8608IDC#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 since 1965.
The LT8608 family targets ultralow-power, high-input-voltage DC/DC conversion for battery-critical and harsh-environment applications - designed specifically for automotive, industrial, and aerospace systems demanding reliability at extreme temperatures and low standby consumption.
FAQ
What is the guaranteed operating temperature range for LT8608IDC#TRPBF?
The LT8608IDC#TRPBF is specified for –40°C to +125°C junction temperature operation and is tested and guaranteed across this full range. Its DFN package with exposed thermal pad enables reliable thermal dissipation in sealed enclosures, making LT8608IDC#TRPBF suitable for under-dash automotive modules and outdoor industrial controllers without derating.
Does LT8608IDC#TRPBF support external frequency synchronization?
No, LT8608IDC#TRPBF does not support external synchronization. As a DFN-package variant, it omits the SYNC pin entirely and operates exclusively in fixed Burst Mode. For sync capability, the MSOP-packaged LT8608IMSE#TRPBF must be used - LT8608IDC#TRPBF's lack of SYNC is a hard package limitation, not a configuration option.
What is the feedback reference voltage for LT8608IDC#TRPBF, and how does it affect output accuracy?
The LT8608IDC#TRPBF has a nominal feedback reference voltage of 0.773V (typical), with min/max of 0.753V/0.803V over temperature. When designing the FB resistor divider, using 1% tolerance resistors yields ±1.2% total output voltage error - critical for powering ADC references or precision analog circuits fed by LT8608IDC#TRPBF.
Can LT8608IDC#TRPBF be used in dropout conditions, and what is its minimum dropout voltage?
Yes, LT8608IDC#TRPBF supports near-100% duty cycle operation. At 1.5A load and 3.3V output, its dropout voltage is approximately 450mV (measured as VIN–VOUT at regulation limit), determined by top switch RDS(ON) and load current. This allows LT8608IDC#TRPBF to sustain 3.3V output down to ~3.75V input - useful during automotive cold-crank events.
How does the absence of TR/SS pin affect startup behavior in LT8608IDC#TRPBF?
LT8608IDC#TRPBF lacks the TR/SS pin, so it has no programmable soft-start or output tracking capability. Startup follows a fixed internal slew rate (~1.5ms to 3.3V), which may cause inrush current issues in systems with large output capacitance. To mitigate, use smaller output caps or add an external soft-start circuit - a key design difference versus MSOP variants of LT8608IDC#TRPBF.
LT8608IDC#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)
LT8608IDC#TRPBF FAQ
1.How can I place an order for LT8608IDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608IDC#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 LT8608IDC#TRPBF reliable?
The price and inventory of LT8608IDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608IDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608IDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608IDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608IDC#TRPBF?
LT8608IDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608IDC#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 LT8608IDC#TRPBF?
For technical support, including LT8608IDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608IDC#TRPBF requirements.
6.How does Aetrix verify that LT8608IDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608IDC#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 LT8608IDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608IDC#TRPBF?
All LT8608IDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608IDC#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 LT8608IDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8608IDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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