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Analog Devices Inc. LT8608BHDC#TRMPBF
- Part No.:
- LT8608BHDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608BHDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:840
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Product details
Overview
LT8608BHDC#TRMPBF 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 operation up to 2.2MHz. It delivers continuous 1.5A output with fast 35ns minimum on-time and ±8.5% power-good accuracy for automotive infotainment power rails.
For engineers reviewing the LT8608BHDC#TRMPBF datasheet, LT8608BHDC#TRMPBF pinout, LT8608BHDC#TRMPBF application, or LT8608BHDC#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance up to 150°C junction, and real-world efficiency curves across 3.3V/5V outputs - all critical for low-EMI battery-powered systems requiring long standby life.
Technical Context
The LT8608BHDC#TRMPBF implements peak-current-mode control with internal compensation, enabling stable regulation using small external inductors and fast transient response. Its fixed-frequency PWM architecture supports programmable switching from 200kHz to 2.2MHz via the RT pin resistor, with no SYNC pin - confirming factory-programmed pulse-skipping operation per DFN variant specification.
Unlike the MSOP version, the LT8608BHDC#TRMPBF omits TR/SS and SYNC pins; its FB reference is 0.773V (min) to 0.783V (max) over temperature, and EN/UV threshold is 0.99V (rising) to 1.11V (falling) with 50mV hysteresis. The device integrates top/bottom NMOS switches with 350mΩ/230mΩ RDS(ON), supporting dropout-limited operation down to VIN – VOUT ≈ 0.55V at full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct connection to 12V/24V automotive batteries with cold-crank tolerance. |
| Quiescent Current | 2.5µA at no load (12VIN → 3.3VOUT) - enables >10-year battery life in always-on telematics modules. |
| Output Current | 1.5A continuous - sufficient for powering dual-core microcontrollers or FPGA I/O banks without derating at 125°C ambient. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT pin - allows optimization between EMI filtering size (high-freq) and light-load efficiency (low-freq). |
| Feedback Reference | 0.773V–0.783V (DFN package, full temp range) - enables accurate 3.3V/5V/12V outputs with ≤1% total error using 1% resistors. |
| Power-Good Threshold | ±8.5% of VOUT - provides reliable sequencing margin for downstream logic and memory ICs. |
| Min On-Time | 35ns - supports high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping or instability. |
Pinout & Package
LT8608BHDC#TRMPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed pad (GND). Pin 1 is BST; pin 2 is SW; pin 3 is INTVCC; pin 4 is RT; pin 5 is EN/UV; pin 6 is VIN; pin 7 is PG; pin 8 is FB. GND (exposed pad) must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; determines top switch turn-on speed and efficiency at high duty cycles. |
| SW | Switch node connecting internal FETs and external inductor | High dv/dt node; must be minimized in layout to reduce EMI and prevent false triggering of internal comparators. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic to GND; powers gate drivers and control logic - not for external loading. |
| RT | Resistor-based oscillator frequency programming | Connects to GND; sets switching frequency from 200kHz–2.2MHz - no external clock support (SYNC absent in DFN). |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold with 50mV hysteresis; enables VIN monitoring or system-level shutdown coordination. |
| VIN | Main input power supply | Supplies internal circuitry and top switch; requires local high-frequency bypass (e.g., 10µF X5R + 1µF X7R) near pin. |
| PG | Open-drain power-good flag | Asserts high when VOUT is within ±8.5% of target and no fault - used for processor reset or sequencer enable. |
| FB | Feedback voltage sensing input | Regulated to 0.773–0.783V; connects to resistor divider from VOUT; phase-lead cap (10pF) recommended with high-value dividers. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode (factory-configured) | Enables continuous clock alignment and predictable EMI spectrum without Burst Mode's variable-frequency noise - ideal for EMC-sensitive infotainment systems. |
| Ultralow 2.5µA quiescent current | Reduces standby power loss in always-on vehicle networks (e.g., CAN FD gateways), extending 12V battery life beyond 10 years under typical parasitic loads. |
| 42V absolute max input rating | Withstands automotive load-dump transients (ISO 7637-2 Pulse 5a) without external TVS, simplifying front-end protection design. |
| 35ns minimum on-time | Supports direct 42V-to-3.3V conversion at 2MHz, eliminating intermediate stages and reducing BOM count in compact ADAS camera modules. |
| Integrated 350mΩ/230mΩ power switches | Eliminates need for external MOSFETs and drivers - reduces solution size to <25mm² including inductor and capacitors for 3.3V/1.5A output. |
| –40°C to +150°C operating junction range | Qualified for under-hood automotive applications (e.g., engine control units) without derating - validated by Analog Devices' H-grade testing. |
Applications
| Automotive Infotainment Power | Telematics Control Unit (TCU) |
|---|---|
|
Use Scenario: Powering SoC core and DDR memory rails in head-unit systems with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V/1.5A buck converter delivering regulated supply with spread-spectrum–free pulse-skipping for deterministic noise floor. Use Value: Achieves >92% efficiency at 0.5A (12V→3.3V) while maintaining <10mVP-P ripple - avoids digital noise coupling into audio DACs and RF receivers. |
Use Scenario: Supplying LTE modem, GNSS receiver, and CAN transceiver in always-on vehicle connectivity modules. IC Role / Device Role / Timing Role: Standby power regulator enabling <2.5µA system quiescent draw during sleep mode with fast wake-up response. Use Value: Extends 12V battery life to >10 years in parked state - meets OEM requirements for remote diagnostics and firmware updates without battery drain. |
| ADAS Camera Module | Industrial IoT Sensor Hub |
|
Use Scenario: Generating 5V/1.5A for image sensor and ISP in compact rear-view cameras mounted near exhaust systems. IC Role / Device Role / Timing Role: High-temp DC/DC converter operating up to 150°C junction, with 35ns min on-time enabling single-stage 42V→5V conversion. Use Value: Eliminates need for pre-regulator stage - reduces board area by 30% and thermal stress vs. cascaded solutions in confined enclosures. |
Use Scenario: Powering ARM Cortex-M7 MCU, LoRa transceiver, and environmental sensors in sealed outdoor edge nodes. IC Role / Device Role / Timing Role: Robust 42V-input buck regulator with EN/UV programmable undervoltage lockout for brown-out resilience. Use Value: Maintains regulation during solar-panel voltage sag (e.g., 36V→3.3V) while consuming only 500µA at 1mA load - extends battery runtime in remote deployments. |
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 |
|---|---|---|---|
| LT8607HDE#TRPBF | Same 42V/1.5A rating but in 12-lead 3mm × 4mm DFN; includes SYNC and TR/SS pins; Burst Mode only. | Supports external frequency synchronization and soft-start tracking - required for multi-rail coordinated power-up in complex processors. | Select when design needs programmable soft-start, EMI reduction via spread spectrum, or precise rail sequencing - not drop-in compatible due to pin count and functionality. |
| MPQ4420AGL-AEC1-Z | 45V/2A AEC-Q200 qualified buck; 17µA IQ in forced PWM; no PG or EN/UV hysteresis; 10-lead 3mm × 3mm QFN. | Lacks power-good flag and accurate UVLO - requires external monitoring circuitry for safety-critical automotive functions. | Select for cost-sensitive non-safety applications where higher current (2A) and AEC-Q200 qualification are prioritized over precision enable/control features. |
Compared with LT8607HDE#TRPBF, LT8608BHDC#TRMPBF trades pin count and flexibility for smaller footprint and guaranteed pulse-skipping behavior; versus MPQ4420AGL-AEC1-Z, it offers superior light-load efficiency, integrated PG, and tighter EN/UV hysteresis - making it preferable for battery-backed and safety-aware designs.
Availability
LT8608BHDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and ADAS camera modules requiring stable component supply with guaranteed 150°C operation and long-term production continuity.
Supply support for LT8608BHDC#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 power management semiconductors, serving automotive, industrial, and communications markets with robust, precision-engineered ICs.
The LT8608 family was designed specifically for automotive and industrial applications demanding ultralow quiescent current, wide input voltage range, and high reliability under extreme temperature and EMI conditions - with the LT8608BHDC#TRMPBF targeting under-hood and infotainment power rails.
FAQ
What is the maximum junction temperature rating for LT8608BHDC#TRMPBF?
The LT8608BHDC#TRMPBF is rated for –40°C to +150°C operating junction temperature, validated per Analog Devices' H-grade qualification. This allows deployment in under-hood automotive locations where ambient temperatures exceed 125°C, provided PCB thermal design maintains θJA ≤ 40°C/W. Derating curves in the datasheet confirm full 1.5A output capability up to 150°C junction.
Does LT8608BHDC#TRMPBF support external clock synchronization?
No, LT8608BHDC#TRMPBF does not support external clock synchronization. As a DFN-package variant of the LT8608B, it lacks the SYNC pin entirely - the device is factory-configured for pulse-skipping mode only. For synchronization capability, consider the MSOP-packaged LT8608HMSE#TRPBF, which includes a dedicated SYNC pin and supports spread-spectrum modulation.
What is the feedback reference voltage tolerance for LT8608BHDC#TRMPBF across temperature?
The LT8608BHDC#TRMPBF has a feedback reference voltage of 0.773V (min) to 0.783V (max) over the full –40°C to +150°C junction temperature range, as specified in the Electrical Characteristics table for DFN packages. This ±1.3% tolerance enables 3.3V output regulation with ≤1.5% total error when combined with 1% feedback resistors and line/load regulation effects.
Can LT8608BHDC#TRMPBF operate with a 2.5V input voltage?
No, LT8608BHDC#TRMPBF cannot operate reliably at 2.5V input. Its absolute minimum input voltage is 2.5V (absolute max rating), but the functional minimum is 3.0V as specified in Applications - below this, internal biasing fails and regulation is not guaranteed. For sub-3V inputs, consider the LT8609S or LTC3642, which support 2.5V start-up.
How is the power-good (PG) flag asserted on LT8608BHDC#TRMPBF?
The PG pin on LT8608BHDC#TRMPBF is an open-drain output that pulls low until VOUT reaches and remains within ±8.5% of the programmed output voltage (e.g., 3.14V–3.46V for 3.3V output) and no fault condition exists. PG is valid when VIN exceeds 3.2V, independent of EN/UV state - enabling use as a system-ready signal even during enable sequencing.
LT8608BHDC#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 ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608BHDC#TRMPBF FAQ
1.How can I place an order for LT8608BHDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608BHDC#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 LT8608BHDC#TRMPBF reliable?
The price and inventory of LT8608BHDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608BHDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608BHDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608BHDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608BHDC#TRMPBF?
LT8608BHDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608BHDC#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 LT8608BHDC#TRMPBF?
For technical support, including LT8608BHDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608BHDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608BHDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608BHDC#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 LT8608BHDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608BHDC#TRMPBF?
All LT8608BHDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608BHDC#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 LT8608BHDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608BHDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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