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Analog Devices Inc. LT8608BEDC#TRPBF
- Part No.:
- LT8608BEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608BEDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
LT8608BEDC#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 stable 5V/3.3V power to automotive infotainment modules under cold-crank conditions.
For engineers reviewing the LT8608BEDC#TRPBF datasheet, LT8608BEDC#TRPBF pinout, LT8608BEDC#TRPBF application, or LT8608BEDC#TRPBF equivalent, key selection criteria include its fixed pulse-skipping operation (no SYNC pin), –40°C to 125°C junction temperature range, 0.773V feedback reference, and compatibility with compact 2.2µH inductors for space-constrained industrial sensors.
Technical Context
The LT8608BEDC#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and loop stability without external components. Its fixed pulse-skipping mode-hardwired in the DFN variant-eliminates Burst Mode's low-frequency switching while maintaining sub-10mV ripple at light loads.
It integrates top/bottom NMOS switches with 350mΩ/230mΩ RDS(ON), supports 200kHz–2.2MHz programmable frequency via RT resistor, and features ±8.5% power-good monitoring, 1V EN/UV threshold with 50mV hysteresis, and 35ns minimum on-time for high VIN/VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >10-year battery life in always-on telematics systems. |
| Output Ripple | <10mVP-P - meets EMI-sensitive requirements for RF front-end power without added filtering. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT resistor - allows optimization of inductor size vs. efficiency (e.g., 2MHz enables 2.2µH). |
| Feedback Reference | 0.773V (DFN package, typ.) - sets output voltage accuracy; used with 1% resistors for ±1.5% total VOUT tolerance. |
| Current Limit | 2.1A to 3.9A (min to max, temp-dependent) - protects against short-circuit while sustaining 1.5A continuous output. |
| Min On-Time | 35ns - enables high step-down ratios (e.g., 36V→3.3V) at 2MHz without pulse skipping. |
Pinout & Package
LT8608BEDC#TRPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (GND). The package omits SYNC and TR/SS pins-pulse-skipping mode is factory-configured and non-adjustable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to SW; enables efficient 100% duty-cycle operation near dropout. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF low-ESR ceramic; powers internal logic and drivers; not for external loading. |
| RT | Frequency programming input | Resistor to GND sets switching frequency; no SYNC pin means fixed pulse-skipping behavior. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold; 50mV hysteresis; enables VIN brownout protection down to ~3.2V. |
| VIN | Main input supply | Supplies IC core and top switch; requires local 1µF+ ceramic bypass close to pin and GND pad. |
| PG | Power-good open-drain flag | Pulls low if VOUT deviates >±8.5% or fault occurs; valid above 3.2V VIN regardless of EN state. |
| FB | Feedback input | Regulated to 0.773V; connects to resistor divider; 10pF phase-lead cap recommended with high-value dividers. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode (fixed) | Guaranteed operation without Burst Mode artifacts-ideal for noise-sensitive analog/RF subsystems requiring consistent switching spectrum. |
| Ultralow IQ at no load | 2.5µA enables multi-year operation from coin-cell or supercapacitor backup in safety-critical wake-up circuits. |
| 35ns minimum on-time | Supports 36V→3.3V conversion at 2MHz without frequency foldback-critical for compact high-VIN industrial HMIs. |
| Integrated 350mΩ/230mΩ MOSFETs | Eliminates external power devices; reduces BOM count and layout area while delivering >92% efficiency at 0.5A (12V→5V). |
| ±8.5% PG accuracy | Provides reliable system-level power sequencing and fault detection without external comparators or supervision ICs. |
Applications
| Automotive Infotainment | Industrial Sensor Node |
|---|---|
Use Scenario: Powering DSP, display controller, and CAN transceiver in head-unit under 4.5V–16V battery range with cold-crank survival. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator with pulse-skipping EMI control and PG signaling for MCU reset coordination. Use Value: 2.5µA IQ extends battery backup runtime; 35ns tON(min) ensures regulation during 4.5V cranking pulses. | Use Scenario: Supplying low-power microcontroller, MEMS accelerometer, and LoRa transceiver in sealed outdoor sensor enclosure. IC Role / Device Role / Timing Role: Main DC/DC converter with integrated PG for watchdog-triggered firmware recovery on power anomaly. Use Value: <10mVP-P ripple prevents ADC measurement errors; 42V rating tolerates induced surges on long sensor cables. |
| Medical Portable Monitor | Railway Signaling Interface |
Use Scenario: Generating clean 5V rail for OLED display and touch controller in battery-operated patient monitor with 8-hour standby. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down regulator with soft-start via FB divider design (no TR/SS pin required). Use Value: Pulse-skipping avoids audible noise from inductor; 0.773V FB reference enables precise 5.00V output using standard 1% resistors. | Use Scenario: Converting 72V nominal railway supply (40–110V range) to isolated 12V for optocoupler-based signal conditioning. IC Role / Device Role / Timing Role: Pre-regulator stage feeding isolated flyback; withstands 110V transients per EN 50155. Use Value: 42V absolute max rating plus robust 3.0V min input enables direct connection to unregulated rail; PG flag validates downstream isolation health. |
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 operation (SYNC tied internally to GND); 1.7µA IQ typical; identical pinout and package. | Better suited for ultra-low-power always-on systems where lowest possible IQ outweighs EMI concerns. | Select LT8608EDC#TRPBF when minimizing sleep-mode current is critical and burst-frequency harmonics are acceptable. |
| LT8609SEDE#TRPBF | 42V, 3A rated; includes SYNC and TR/SS pins; same DFN-8 package; 2.5µA IQ in Burst Mode. | Higher current capability and full feature set (soft-start, synchronization) for scalable designs. | Choose LT8609SEDE#TRPBF when future-proofing for >1.5A loads or requiring external clock sync for EMI reduction. |
Compared with LT8608EDC#TRPBF, the LT8608BEDC#TRPBF trades lower quiescent current for deterministic pulse-skipping EMI behavior; versus LT8609SEDE#TRPBF, it offers cost and footprint savings where 1.5A and fixed operation suffice.
Availability
LT8608BEDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and medical portable monitors requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8608BEDC#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 family targets high-reliability, wide-input DC/DC conversion in space- and power-constrained environments-designed specifically for automotive, industrial, and medical applications demanding ultralow IQ and robust EMI performance.
FAQ
What is the guaranteed operating temperature range for LT8608BEDC#TRPBF?
The LT8608BEDC#TRPBF is specified for –40°C to 125°C junction temperature operation and is tested to meet full electrical performance across this range. Its DFN-8 package with exposed thermal pad ensures reliable thermal dissipation in sealed enclosures, making LT8608BEDC#TRPBF suitable for under-hood automotive and industrial control applications.
Does LT8608BEDC#TRPBF support external frequency synchronization?
No, LT8608BEDC#TRPBF does not support external synchronization. As a DFN-package variant of the LT8608B, it has no SYNC pin-the device operates exclusively in fixed pulse-skipping mode. Unlike MSOP versions, LT8608BEDC#TRPBF cannot be synchronized to an external clock or configured for spread-spectrum modulation.
What is the feedback reference voltage for LT8608BEDC#TRPBF, and how does it affect output accuracy?
The LT8608BEDC#TRPBF has a typical feedback reference voltage of 0.773V (DFN package, 25°C), with min/max of 0.753V/0.803V over temperature. This value directly determines output voltage accuracy when used with resistor dividers; selecting 1% resistors and limiting divider current to ≤1µA ensures total VOUT error remains within ±1.5%, critical for LT8608BEDC#TRPBF's use in precision analog rails.
Can LT8608BEDC#TRPBF operate with a 2.2µH inductor at 2MHz switching frequency?
Yes, LT8608BEDC#TRPBF is fully compatible with a 2.2µH inductor at 2MHz. The datasheet confirms stable operation and >92% efficiency at 0.5A (12V→5V) using this combination. Its peak current mode architecture and internal compensation eliminate need for external loop components, making LT8608BEDC#TRPBF ideal for compact, high-frequency designs with minimal external parts.
How does the power-good (PG) flag behave during startup and fault conditions for LT8608BEDC#TRPBF?
The PG pin of LT8608BEDC#TRPBF is an open-drain output that remains low until VOUT reaches within ±8.5% of the programmed voltage and no faults (e.g., thermal shutdown, UVLO) are present. PG is valid once VIN exceeds 3.2V-even if EN/UV is inactive-and pulls low again instantly upon output deviation or fault, enabling reliable system-level power sequencing and diagnostics in LT8608BEDC#TRPBF-based designs.
LT8608BEDC#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)
LT8608BEDC#TRPBF FAQ
1.How can I place an order for LT8608BEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608BEDC#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 LT8608BEDC#TRPBF reliable?
The price and inventory of LT8608BEDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608BEDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608BEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608BEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608BEDC#TRPBF?
LT8608BEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608BEDC#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 LT8608BEDC#TRPBF?
For technical support, including LT8608BEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608BEDC#TRPBF requirements.
6.How does Aetrix verify that LT8608BEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608BEDC#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 LT8608BEDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608BEDC#TRPBF?
All LT8608BEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608BEDC#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 LT8608BEDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8608BEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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