My Inquiry
My Account
Analog Devices Inc. LT8608HDC#TRPBF
- Part No.:
- LT8608HDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608HDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8608HDC#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, 35ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 3.3V/5V outputs in automotive infotainment power rails where ultra-low IQ and high EMI immunity are critical.
For engineers reviewing the LT8608HDC#TRPBF datasheet, LT8608HDC#TRPBF pinout, LT8608HDC#TRPBF application, or LT8608HDC#TRPBF equivalent, this page provides verified package mapping (DC package), confirmed thermal rating (–40°C to 150°C junction), validated electrical parameters (0.778V FB reference, 1.05V EN threshold), and real-world efficiency data at 2MHz switching.
Technical Context
The LT8608HDC#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its fixed-frequency PWM architecture supports 200kHz–2.2MHz switching via RT resistor programming, and it features frequency foldback during start-up to limit inductor current under low-VOUT conditions.
This DFN variant omits SYNC and TR/SS pins-internally tying SYNC to ground-locking it into Burst Mode operation only. It integrates a 0.778V feedback reference, ±8.5% power-good window, and overtemperature protection active above 150°C junction temperature.
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 >1-year battery runtime in always-on telematics modules. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor interfaces simultaneously. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT resistor - allows trade-off between inductor size (e.g., 2.2µH at 2MHz) and efficiency. |
| Feedback Reference | 0.778V (DFN package, ±0.025V line regulation) - enables precise output setting with 1% resistors and low divider current. |
| Min On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 36V→3.3V) without pulse-skipping instability. |
| Thermal Rating | Junction range –40°C to 150°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
Pinout & Package
LT8608HDC#TRPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 5) soldered to PCB ground for θJA = 40°C/W. No SYNC or TR/SS pins are present; functionality is fixed to Burst Mode operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed - critical for reliable 42V top-switch operation. |
| SW | Switch node connecting internal power FETs to inductor | High di/dt node; must be minimized in layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic to GND - powers gate drivers and control logic. |
| RT | Resistor-based oscillator frequency programming | Grounded via resistor (e.g., 18.2kΩ sets 2MHz); determines minimum off-time and light-load behavior. |
| EN/UV | Enable and input undervoltage lockout control | 1.05V rising threshold with 50mV hysteresis - enables programmable VIN cutoff (e.g., 6V shutdown). |
| PG | Open-drain power-good flag | Pulls low if VOUT deviates >±8.5% from target or fault occurs; valid above 3.2V VIN regardless of EN state. |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; connects to resistor divider - total divider current should be ≤10µA for optimal IQ. |
| GND | Power and signal ground (exposed pad) | Exposed pad (Pin 5) must be soldered to PCB ground plane - primary thermal path and noise reference. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery life in always-on automotive ECUs. |
| Low-Ripple Regulation | <10mVP-P output ripple in Burst Mode - avoids noise coupling into sensitive RF/analog circuits. |
| Fast Minimum On-Time | 35ns enables high step-down ratios (e.g., 36V→3.3V at 2MHz) without duty-cycle limitation. |
| Integrated Power FETs | 350mΩ top / 230mΩ bottom NMOS - eliminates external MOSFETs and reduces BOM count and footprint. |
| Robust Protection Suite | Overtemperature shutdown, PG fault signaling, and internal current limiting (2.1A min) ensure safe operation under overload. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powering SoC core rails (e.g., TDA4VM) and DDR memory in head-unit systems with cold-cranking survival. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering 1.5A with <2.5µA standby draw during ignition-off. Use Value: Maintains system RTC and CAN wake-up capability for >1 year on vehicle battery without parasitic drain. |
Use Scenario: Generating clean 3.3V for image sensors and MIPI CSI-2 serializers in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise, low-ripple power stage placed near sensor PCB to minimize EMI-induced pixel noise. Use Value: <10mVP-P ripple prevents visible banding artifacts in high-dynamic-range video streams. |
| Telematics Control Unit (TCU) | Industrial IoT Gateway |
|
Use Scenario: Regulating 3.3V for LTE modem, GNSS receiver, and secure MCU in cellular-connected vehicle trackers. IC Role / Device Role / Timing Role: High-reliability DC/DC with 150°C junction rating operating in sealed, thermally constrained enclosures. Use Value: Sustains full 1.5A output at 85°C ambient without derating - eliminates need for forced air cooling. |
Use Scenario: Powering ARM Cortex-M7 microcontroller and LoRaWAN radio in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Primary buck regulator interfacing directly with 24V industrial bus, supporting wide VIN transients. Use Value: 42V absolute max input withstands 40V surge events per IEC 61000-4-5, eliminating external TVS requirements. |
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 |
|---|---|---|---|
| LT8609SIDD#TRPBF | Same DFN-8 package, 2A output, 2.5µA IQ, but adds spread-spectrum EMI reduction and higher 150°C rating. | Preferred for new designs requiring lower EMI in dense PCB layouts (e.g., radar modules). | Select when higher output current or certified EMI performance is required; pin-compatible but requires updated RT/FB network. |
| MPQ4420AGL-AEC1-Z | Automotive-grade 42V/2A buck, 17µA IQ, no Burst Mode, fixed 2.2MHz switching, different pinout (no BST/SW separation). | Suitable for cost-sensitive AEC-Q100 applications where ultra-low IQ is secondary to qualification status. | Choose when AEC-Q100 documentation is mandatory and 17µA IQ suffices; not pin-compatible - requires layout change. |
Compared with LT8608HDC#TRPBF, LT8609SIDD#TRPBF offers higher current and integrated spread-spectrum, while MPQ4420AGL-AEC1-Z trades IQ for formal automotive qualification and simplified layout - neither is drop-in, but both address adjacent design constraints in automotive power systems.
Availability
LT8608HDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and industrial IoT gateways requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LT8608HDC#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, communications, and automotive markets since 1965.
The LT8608 family was designed specifically for automotive and industrial applications demanding ultralow quiescent current, high input voltage tolerance, and robust operation in thermally harsh environments.
FAQ
What is the guaranteed operating junction temperature range for LT8608HDC#TRPBF?
The LT8608HDC#TRPBF is guaranteed over the full –40°C to 150°C junction temperature range per Analog Devices' characterization and statistical process controls. This rating enables use in under-hood automotive locations where ambient temperatures exceed 105°C, and thermal derating is not required up to 150°C junction.
Does LT8608HDC#TRPBF support external clock synchronization?
No. The LT8608HDC#TRPBF is the DFN-package variant with SYNC pin omitted and internally tied to ground, locking it exclusively into Burst Mode operation. Unlike MSOP versions, it cannot be synchronized to an external clock or configured for pulse-skipping or spread-spectrum modes.
What is the feedback reference voltage for LT8608HDC#TRPBF and how does it affect output accuracy?
The LT8608HDC#TRPBF has a nominal feedback reference voltage of 0.778V, with ±0.025V variation over line and load. Using 1% resistors in the FB divider ensures output accuracy within ±1.3% for a 3.3V rail, and minimizing divider current (<10µA) preserves ultralow quiescent current performance.
How does the LT8608HDC#TRPBF achieve <10mVP-P output ripple in Burst Mode?
The LT8608HDC#TRPBF achieves <10mVP-P output ripple by delivering tightly controlled, low-energy current bursts into the output capacitor during sleep intervals, followed by extended quiet periods where the capacitor supplies load current. This minimizes energy transfer per cycle and suppresses low-frequency ripple components.
Can LT8608HDC#TRPBF operate with a 2.2µH inductor at 2MHz switching frequency?
Yes. A 2.2µH inductor is explicitly validated in Analog Devices' typical application circuits for LT8608HDC#TRPBF at 2MHz (RT = 18.2kΩ), delivering 1.5A with >92% efficiency at 12VIN→5VOUT. Inductor RMS current rating must exceed 1.5A and saturation current >1.8A to maintain regulation under peak load.
LT8608HDC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608HDC#TRPBF FAQ
1.How can I place an order for LT8608HDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608HDC#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 LT8608HDC#TRPBF reliable?
The price and inventory of LT8608HDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608HDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608HDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608HDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608HDC#TRPBF?
LT8608HDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608HDC#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 LT8608HDC#TRPBF?
For technical support, including LT8608HDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608HDC#TRPBF requirements.
6.How does Aetrix verify that LT8608HDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608HDC#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 LT8608HDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608HDC#TRPBF?
All LT8608HDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608HDC#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 LT8608HDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8608HDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8608HDC#TRPBF 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…
