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Analog Devices Inc. LT8608EMSE#TRPBF
- Part No.:
- LT8608EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8608EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
LT8608EMSE#TRPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, and internal compensation. It delivers regulated 3.3V/5V outputs from automotive or industrial 12V/24V rails, supports 200kHz–2.2MHz switching via RT resistor, and features PG flag, EN/UV shutdown, and soft-start/tracking via TR/SS pin. Used in battery-powered telematics and low-power IoT sensors.
For engineers reviewing the LT8608EMSE#TRPBF datasheet, LT8608EMSE#TRPBF pinout, LT8608EMSE#TRPBF application, or LT8608EMSE#TRPBF equivalent, key selection criteria include ultralow IQ at light load, 35ns minimum on-time for high VIN/VOUT ratios, ±8.5% PG accuracy, SYNC-enabled spread-spectrum EMI reduction, and MSOP-10 thermal performance with exposed pad.
Technical Context
The LT8608EMSE#TRPBF implements constant-frequency peak current mode control with internal 0.778V reference and slope compensation. Its oscillator frequency is programmable (200kHz–2.2MHz) via RT-to-GND resistor and synchronizable via external clock on SYNC pin - enabling EMI reduction through spread-spectrum modulation when SYNC is tied to 3.3V.
Burst Mode operation reduces input quiescent current to 1.7µA (typical) while maintaining <10mVP-P output ripple; pulse-skipping mode (SYNC floating) sustains full-frequency operation at lower loads but increases IQ to several mA. The EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for VIN undervoltage lockout or controlled enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports cold-crank automotive (6.5V) and industrial 36V bus without pre-regulation. |
| Quiescent Current (Burst Mode) | 2.5µA typical at 12VIN→3.3VOUT no-load - enables >10-year battery life in always-on sensor nodes. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, RF modules, and analog front-ends. |
| Switching Frequency Range | 200kHz to 2.2MHz - adjustable via RT resistor; allows optimization of inductor size vs. efficiency trade-off. |
| Feedback Reference Voltage | 0.778V ±12mV - sets output voltage accuracy; enables precise 3.3V/5V regulation with 1% resistors. |
| Minimum On-Time | 35ns - supports high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse skipping. |
| Power Good Accuracy | ±8.5% of VOUT - ensures reliable system sequencing and fault detection before downstream logic powers up. |
Pinout & Package
LT8608EMSE#TRPBF uses a 10-lead MSOP package with exposed thermal pad (Pin 11 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; critical for top switch turn-on; no series resistor allowed. |
| SW | Switch node connecting internal power FETs to inductor | High dv/dt node; must be minimized on PCB layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; supplies internal logic/drivers; not for external loading. |
| RT | Resistor-based oscillator frequency programming | RT-to-GND sets fSW from 200kHz–2.2MHz; determines inductor/capacitor sizing and EMI profile. |
| SYNC | External clock synchronization input | Ground = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum; absent in DFN variants. |
| EN/UV | Enable and input undervoltage lockout control | 1.05V rising threshold with 50mV hysteresis; enables VIN brownout protection or remote shutdown. |
| PG | Open-drain Power Good status flag | Pulls low if VOUT deviates >±8.5% or fault occurs; valid above 3.2V VIN regardless of EN state. |
| TR/SS | Soft-start and output voltage tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; supports power sequencing with other rails. |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; connects to resistor divider; 10pF phase lead recommended with high-value dividers. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) is GND; must be soldered to large PCB copper area for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ at no load enables multi-year operation from coin cells or energy-harvesting sources. |
| Low-Ripple Burst Mode | Maintains <10mVP-P output ripple while achieving >90% efficiency at 1mA load - ideal for noise-sensitive analog circuits. |
| Fast Minimum On-Time | 35ns enables 42V→3.3V conversion at 2MHz without duty-cycle limitation or forced discontinuous mode. |
| Synchronizable Spread-Spectrum | SYNC pin accepts 0.4–3.2V logic; 3.3V bias enables ±6kHz frequency dithering to reduce peak EMI by >10dB. |
| Integrated Compensation | No external compensation components required - reduces BOM count and design cycle time for compact layouts. |
Applications
| Automotive Telematics | Industrial Sensor Nodes |
|---|---|
Use Scenario: Always-on GPS/GLONASS module in fleet tracking device powered by vehicle battery with wide VIN range (6–42V) and cold-crank dips. IC Role / Device Role / Timing Role: Primary 3.3V power supply for MCU, GNSS receiver, and cellular modem; regulates during engine start-up transients. Use Value: 2.5µA IQ prevents battery drain during weeks of parking; 35ns on-time maintains regulation at 42V→3.3V even at 2MHz switching. | Use Scenario: Wireless vibration sensor mounted on rotating machinery, powered by LiSOCl₂ primary cell with 10+ year shelf life requirement. IC Role / Device Role / Timing Role: Step-down regulator delivering 3.3V to ultra-low-power MCU and MEMS accelerometer during periodic wake-up bursts. Use Value: Burst Mode IQ of 2.5µA extends battery life beyond 12 years; PG flag validates rail stability before sensor sampling. |
| Medical Portable Monitors | Low-EMI Industrial PLC I/O |
Use Scenario: Battery-operated patient monitor requiring clean 5V rail for ADCs and op-amps, with strict EMI limits for FCC/IEC 60601 compliance. IC Role / Device Role / Timing Role: Main 5V supply with spread-spectrum enabled via SYNC pin to suppress narrowband EMI peaks in sensitive analog signal chain. Use Value: Spread-spectrum modulation reduces 2MHz fundamental and harmonics by >15dB; <10mVP-P ripple avoids ADC quantization noise. | Use Scenario: DIN-rail mounted PLC module with 24V DC input powering isolated digital I/O and communication interfaces (RS-485, CAN). IC Role / Device Role / Timing Role: Point-of-load regulator generating 3.3V for microcontroller and interface ICs; synchronized to system clock to avoid beat frequencies. Use Value: SYNC pin allows alignment to 1MHz system clock, eliminating subharmonic interference in isolated data lines and reducing conducted emissions. |
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 |
|---|---|---|---|
| LT8609EMSE#TRPBF | Same MSOP-10 package; higher 2A output current; identical 2.5µA IQ and 42V rating; adds integrated MOSFET drivers for external high-current stages. | Required where >1.5A load current or need for hybrid buck + external FET stage exists; not drop-in due to different FB divider scaling. | Select LT8609EMSE#TRPBF only if output current exceeds 1.5A or system requires scalable power architecture with external switches. |
| TPS54340DDAR | 3.5–42V input; 3.5A output; 4.5µA IQ; no spread-spectrum; fixed 500kHz/2.2MHz options; SO-8 package; no TR/SS or PG pins. | Lacks soft-start control, power-good signaling, and EMI-reduction features; suited for cost-sensitive, non-critical industrial supplies. | Choose TPS54340DDAR for simpler, higher-current applications where EMI, sequencing, and ultra-low IQ are secondary concerns. |
Compared with LT8609EMSE#TRPBF, LT8608EMSE#TRPBF offers identical ultralow IQ and EMI features in a smaller solution size but trades 0.5A output capability; versus TPS54340DDAR, it delivers superior light-load efficiency and advanced system integration (PG, TR/SS, SYNC) at higher component cost.
Availability
LT8608EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive telematics, industrial sensor nodes, portable medical monitors, and low-EMI PLC I/O requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8608EMSE#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 power management markets.
The LT8608EMSE#TRPBF belongs to the LT® monolithic synchronous buck regulator product line, designed specifically for high-input-voltage, ultralow-quiescent-current applications in automotive, industrial, and battery-powered systems.
FAQ
What is the guaranteed operating junction temperature range for LT8608EMSE#TRPBF?
The LT8608EMSE#TRPBF is rated for –40°C to 125°C junction temperature. This "E" grade variant is characterized and assured over this full range per Analog Devices' design, correlation, and statistical process controls - making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed 85°C.
Can LT8608EMSE#TRPBF operate with a 48V input?
No - LT8608EMSE#TRPBF has an absolute maximum VIN rating of 42V. Exceeding this risks permanent damage. For 48V nominal systems, use transient clamping (TVS) or a pre-regulator stage to ensure VIN never exceeds 42V, including during load dump events. The datasheet specifies 42V as the hard limit for all conditions.
How does the TR/SS pin function during power-up in LT8608EMSE#TRPBF?
In LT8608EMSE#TRPBF, the TR/SS pin sources a precise 2µA current from INTVCC. When a capacitor is connected from TR/SS to GND, this current linearly ramps the TR/SS voltage, forcing the FB pin to track it until reaching 0.778V - enabling controlled output voltage slew rate and coordinated sequencing with other rails in the system.
Is LT8608EMSE#TRPBF pin-compatible with LT8608B variants?
No - LT8608EMSE#TRPBF (MSOP-10) shares the same pinout as LT8608IMSE#TRPBF and LT8608HMSE#TRPBF, but LT8608B is only offered in DFN-8 packages with different pin count, functions (no SYNC/TR/SS), and internal mode configuration (pulse-skipping only). There is no pin-compatible LT8608B MSOP variant.
What is the purpose of the BST capacitor in LT8608EMSE#TRPBF, and what value is recommended?
The BST capacitor (0.1µF X7R ceramic) provides gate drive voltage above VIN for the high-side NMOS switch. It must be placed as close as possible between BST and SW pins. Using a larger value does not improve performance and may cause startup instability; undersizing risks insufficient gate drive and increased conduction loss in the top FET.
LT8608EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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:
- 10-MSOP-EP
LT8608EMSE#TRPBF FAQ
1.How can I place an order for LT8608EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608EMSE#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 LT8608EMSE#TRPBF reliable?
The price and inventory of LT8608EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8608EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608EMSE#TRPBF?
LT8608EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608EMSE#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 LT8608EMSE#TRPBF?
For technical support, including LT8608EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8608EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8608EMSE#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 LT8608EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8608EMSE#TRPBF?
All LT8608EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608EMSE#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 LT8608EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8608EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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