My Inquiry
My Account
Analog Devices Inc. LT8608HDC#TRMPBF
- Part No.:
- LT8608HDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608HDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:909
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8608HDC#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 operation, 35ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 3.3V/5V outputs in automotive and industrial power supplies where ultra-low IQ and high efficiency at light loads are critical.
For engineers reviewing the LT8608HDC#TRMPBF datasheet, LT8608HDC#TRMPBF pinout, LT8608HDC#TRMPBF application, or LT8608HDC#TRMPBF equivalent, key selection criteria include guaranteed –40°C to 150°C junction temperature operation, fixed Burst Mode functionality (no SYNC pin), 0.778V feedback reference, and DFN-package thermal performance with exposed pad grounding.
Technical Context
The LT8608HDC#TRMPBF implements peak current mode control with internal 0.778V reference and programmable switching frequency (200kHz–2.2MHz via RT resistor). Its monolithic architecture integrates top/bottom NMOS switches (350mΩ/230mΩ RDS(ON)) and a 3.5V INTVCC regulator, enabling compact designs with small inductors and low EMI.
Burst Mode operation reduces input supply current to 1.7µA (typical) under no-load conditions while maintaining output ripple <10mVP-P. The device features accurate 1V EN/UV threshold with 50mV hysteresis, ±8.5% PG flag accuracy, and thermal shutdown protection-optimized for wide-input industrial and automotive systems requiring high reliability at elevated temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V/36V automotive and industrial rails with dropout down to ~3.2V |
| Quiescent Current (Burst Mode) | 2.5µA typical at 12VIN/3.3VOUT - enables >10-year battery life in always-on sensor nodes |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, FPGAs, and analog front-ends |
| Feedback Reference Voltage | 0.778V ±12mV - sets output voltage accuracy; enables precise 3.3V/5V regulation with 1% resistors |
| Minimum On-Time | 35ns - allows high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse-skipping instability |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and high-temp industrial environments |
| Package | 8-lead 2mm × 2mm DFN with exposed thermal pad - provides low θJA for high-power-density layouts |
Pinout & Package
LT8608HDC#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 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 |
| 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 | Resistor to GND sets fSW from 200kHz to 2.2MHz; determines inductor size and efficiency trade-offs |
| EN/UV | Enable and undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; used to disable regulator or program VIN UVLO |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency bypass near VIN/GND pins |
| PG | Power good open-drain flag | Asserts high when VOUT is within ±8.5% of target; valid above 3.2V VIN regardless of EN/UV state |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider; 20nA input bias minimizes load error |
| GND | Power and signal ground | Exposed pad (Pin 9); must be soldered to PCB plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA typical at no load enables multi-year operation from coin cells or energy harvesters |
| Low-ripple Burst Mode | Maintains <10mVP-P output ripple while achieving >90% efficiency at 1mA loads |
| High-speed current-mode control | 35ns min on-time and internal compensation enable fast transient response with minimal external components |
| Robust thermal rating | Guaranteed operation up to 150°C junction temperature supports under-hood and enclosed industrial use |
| Integrated power switches | 350mΩ top / 230mΩ bottom NMOS reduce conduction loss and eliminate external MOSFET layout complexity |
Applications
| Automotive Body Control Module (BCM) | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering CAN transceivers, microcontrollers, and LIN interfaces in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator supplying MCU core and peripheral rails. Use Value: 2.5µA IQ ensures compliance with ISO 16750-2 quiescent current requirements for parked vehicle battery drain. | Use Scenario: Battery-powered wireless vibration sensors deployed in factory machinery monitoring. IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated 3.3V to ultra-low-power MCU and BLE radio during periodic wake-up bursts. Use Value: Burst Mode efficiency >85% at 100µA load extends 2xAA battery life beyond 5 years. |
| Railway Onboard Telematics Unit | Medical Portable Diagnostic Device |
Use Scenario: Power conversion in train-mounted GPS/data loggers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Input-stage buck regulator accepting 24V–110V nominal rail with 42V absolute max clamping. Use Value: Guaranteed 150°C operation eliminates derating concerns in sealed enclosures with limited airflow. | Use Scenario: Power management in handheld ultrasound probes requiring silent, low-noise operation. IC Role / Device Role / Timing Role: Low-EMI 3.3V supply for analog front-end and ADC, minimizing switching noise coupling into sensitive signal paths. Use Value: Fixed Burst Mode eliminates spread-spectrum jitter, ensuring clean spectral profile for medical EMC compliance. |
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 |
|---|---|---|---|
| LT8609HDE#TRPBF | Same DFN-8 package, 2A output, 2.5µA IQ, but includes SYNC pin and supports pulse-skipping/spread-spectrum | Enables EMI-sensitive applications requiring external clock sync or variable-frequency modulation | Select when higher output current or flexible control modes are required; not pin-compatible due to added SYNC function |
| TPS62840DRLR | 2.5V–6V input, 1A output, 60nA IQ, WSON-12 package; lacks 42V rating and high-temp qualification | Suitable only for low-voltage battery-powered devices-not for automotive or industrial 12V+/high-temp use | Choose only for sub-6V systems prioritizing nanoscale IQ; incompatible with 42V input or 150°C operation |
Compared with LT8609HDE#TRPBF and TPS62840DRLR, LT8608HDC#TRMPBF uniquely balances 42V input tolerance, 150°C operation, and ultralow 2.5µA quiescent current in a minimal 2mm × 2mm footprint-making it optimal for space-constrained, high-reliability automotive and industrial buck applications where Burst Mode simplicity is preferred over configurability.
Availability
LT8608HDC#TRMPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial IoT sensor nodes, railway telematics units, and portable medical diagnostics requiring stable component supply across extended temperature ranges.
Supply support for LT8608HDC#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, industrial automation, and automotive markets.
The LT8608 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in harsh environments-targeting automotive infotainment, ADAS subsystems, and industrial control where wide VIN, high temp, and battery longevity are critical.
FAQ
What is the guaranteed operating junction temperature range for LT8608HDC#TRMPBF?
The LT8608HDC#TRMPBF is guaranteed to operate from –40°C to 150°C junction temperature. This H-grade qualification is verified per Analog Devices' production test flow and supports under-hood automotive and high-temperature industrial deployments where standard commercial or industrial grades would fail.
Does LT8608HDC#TRMPBF support external clock synchronization?
No. LT8608HDC#TRMPBF is a DFN-package variant with no SYNC pin; it operates exclusively in fixed Burst Mode. Unlike MSOP versions (e.g., LT8608HMSE#TRPBF), this part cannot be synchronized, pulse-skipped, or spread-spectrum modulated-the functionality is hardwired for lowest possible IQ and design simplicity.
What is the feedback reference voltage of LT8608HDC#TRMPBF and how does it affect output accuracy?
The LT8608HDC#TRMPBF regulates the FB pin to 0.778V ±12mV (±1.5%) over temperature. This reference directly determines output voltage accuracy: for a 3.3V output, using 1% resistors yields ±2% total tolerance. Lower reference drift improves regulation stability across load and line variations.
Can LT8608HDC#TRMPBF be used in 48V automotive systems?
No. LT8608HDC#TRMPBF has an absolute maximum VIN rating of 42V. While some 48V systems operate nominally at 45V, transients can exceed 60V. For true 48V compatibility, consider the LT8609S or LT8640S families, which support 65V absolute max input and are qualified for 48V architectures.
How is thermal performance managed in the LT8608HDC#TRMPBF DFN package?
LT8608HDC#TRMPBF uses an 8-lead DFN with exposed thermal pad (Pin 9 = GND). To achieve rated 150°C operation, the pad must be soldered to a minimum 100mm² copper area with ≥4 thermal vias to inner/ground planes. Without proper thermal land design, junction temperature rise exceeds specifications, triggering thermal shutdown prematurely.
LT8608HDC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608HDC#TRMPBF FAQ
1.How can I place an order for LT8608HDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608HDC#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 LT8608HDC#TRMPBF reliable?
The price and inventory of LT8608HDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608HDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608HDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608HDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608HDC#TRMPBF?
LT8608HDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608HDC#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 LT8608HDC#TRMPBF?
For technical support, including LT8608HDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608HDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608HDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608HDC#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 LT8608HDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608HDC#TRMPBF?
All LT8608HDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608HDC#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 LT8608HDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608HDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8608HDC#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
