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Analog Devices Inc. LT8608IMSE#PBF
- Part No.:
- LT8608IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8608IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,221
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Product details
Overview
LT8608IMSE#PBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator in a 10-lead MSOP package with 2.5µA quiescent current in Burst Mode, 35ns minimum on-time, and adjustable 200kHz–2.2MHz switching frequency. It delivers regulated 3.3V/5V outputs for automotive infotainment power rails and industrial sensor nodes requiring ultra-low standby power.
For engineers reviewing the LT8608IMSE#PBF datasheet, LT8608IMSE#PBF pinout, LT8608IMSE#PBF application, or LT8608IMSE#PBF equivalent, key selection criteria include its 1.7µA no-load IQ, ±8.5% PG flag accuracy, internal compensation, SYNC/ TR/SS programmability, and guaranteed –40°C to 125°C operation.
Technical Context
The LT8608IMSE#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors. Its 35ns minimum on-time supports high VIN/VOUT ratios (e.g., 36V→3.3V) without cycle skipping under light loads.
It integrates dual NMOS power switches (350mΩ top / 230mΩ bottom), a 3.5V INTVCC regulator, and a precision 0.778V feedback reference with ±0.06%/V line regulation. The EN/UV pin features 1.05V rising threshold and 50mV hysteresis for reliable input UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive and 36V industrial bus inputs without pre-regulation. |
| Quiescent Current | 1.7µA (typ) in Burst Mode - enables >10-year battery life in always-on IoT sensors. |
| Output Current | 1.5A continuous - sufficient for powering microcontrollers, CAN transceivers, and ADCs. |
| Switching Frequency | 200kHz to 2.2MHz (adjustable via RT resistor) - allows optimization of size vs. efficiency; 2MHz enables 2.2µH inductor use. |
| Feedback Reference | 0.778V ±12mV - enables accurate output voltage setting with standard 1% resistors. |
| Power Good Threshold | ±8.5% of VFB - provides reliable output monitoring for system sequencing and fault detection. |
| Min On-Time | 35ns - supports high-step-down ratios (e.g., 36V→3.3V at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8608IMSE#PBF uses a 10-lead MSOP package with exposed thermal pad (Pin 11 = GND). The package supports high-power density layouts with low θJA = 40°C/W when the exposed pad is soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed - critical for top FET turn-on robustness. |
| 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 output | Bypass with ≥1µF ceramic to GND; supplies internal logic and drivers - not for external loading. |
| RT | Frequency setting resistor input | Resistor to GND sets fSW from 200kHz–2.2MHz; determines inductor size and light-load behavior. |
| SYNC | External clock sync / mode select | GND = Burst Mode; float = pulse-skipping; INTVCC = spread-spectrum - enables EMI reduction and timing coordination. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - allows precise VIN brownout protection or shutdown control. |
| PG | Power good open-drain flag | Pulls low if VOUT deviates >±8.5% or fault occurs; valid above 3.2V VIN - used for system power sequencing. |
| TR/SS | Soft-start and output tracking | 2µA internal pull-up enables capacitor-programmed slew rate; supports voltage ramping and multi-rail sequencing. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider - total divider current impacts light-load IQ. |
| GND | Power and signal ground | Exposed pad (Pin 11) must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 1.7µA typical no-load current enables >10-year coin-cell operation in remote sensors. |
| Programmable Spread Spectrum | SYNC pin tied to 3.2–5.0V enables ±3kHz modulation - reduces peak EMI by >10dB without filter redesign. |
| Internal Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while maintaining stability across 200kHz–2.2MHz. |
| Accurate Power Good Flag | ±8.5% VFB window ensures reliable system reset and sequencing - no external comparator needed. |
| Adjustable Soft-Start | TR/SS pin with external capacitor sets output ramp time - prevents inrush current in multi-load systems. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering 3.3V MCU, display interface, and audio codec in head unit with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3V at up to 1.5A with <10mVpp ripple. Use Value: 2.5µA IQ extends battery backup runtime during vehicle sleep mode; SYNC enables EMI alignment with CAN bus timing. |
Use Scenario: Providing 5V rail for low-power wireless sensor (LoRaWAN/NB-IoT) operating from solar-charged Li-ion. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable soft-start for cold-start capability. Use Value: 92% efficiency at 0.5A (12VIN→5VOUT) maximizes energy harvest; TR/SS enables controlled wake-up sequencing. |
| Ruggedized Medical Instrumentation | Test & Measurement Front-End |
Use Scenario: Generating isolated 5V supply for analog front-end in portable ECG monitor powered from 3.7V LiPo + boost stage. IC Role / Device Role / Timing Role: Secondary buck regulator handling 36V transients from boost output with robust overvoltage protection. Use Value: 42V absolute max rating and 35ns min on-time prevent dropout during load dumps; PG flag validates rail integrity before ADC sampling. |
Use Scenario: Supplying clean 3.3V to high-speed ADC and FPGA core in portable oscilloscope with 12V input. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source synchronized to system clock via SYNC pin. Use Value: <10mVpp ripple in Burst Mode avoids ADC quantization noise; 2MHz operation allows compact 2.2µH inductor. |
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 |
|---|---|---|---|
| LT8609SIMSE#PBF | Includes integrated ferrite-bead EMI filter and improved CISPR-25 compliance; same 1.5A/42V rating but higher cost. | Better suited for automotive EMC-critical designs where board space permits integrated filtering. | Select LT8609SIMSE#PBF when meeting Class 5 CISPR-25 limits is mandatory and BOM cost premium is acceptable. |
| MPQ4420AGL-AEC1-P | Automotive-grade (AEC-Q100 Grade 1), 45V/2A, 17µA IQ - lacks SYNC/TR/SS pins and spread-spectrum capability. | Targeted at cost-sensitive automotive body electronics where extended temperature range is required but advanced features are unnecessary. | Choose MPQ4420AGL-AEC1-P only when AEC-Q100 qualification is mandatory and Burst Mode IQ <3µA is not required. |
Compared with LT8609SIMSE#PBF, the LT8608IMSE#PBF offers lower IQ and full feature set at lower cost but requires external EMI filtering; versus MPQ4420AGL-AEC1-P, it provides superior light-load efficiency and programmability but lacks AEC-Q100 certification.
Availability
LT8608IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power, industrial sensor node supply, and ruggedized medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LT8608IMSE#PBF 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 industrial, automotive, communications, and healthcare markets.
The LT8608 product line delivers ultralow-quiescent-current synchronous buck regulators for battery-powered and energy-harvesting systems where standby efficiency and compact solution size are critical design constraints.
FAQ
What is the guaranteed operating temperature range for LT8608IMSE#PBF?
The LT8608IMSE#PBF is guaranteed to operate from –40°C to +125°C junction temperature. This industrial-grade rating is validated per Analog Devices' characterization and statistical process controls, making it suitable for under-hood automotive and factory-floor industrial environments where ambient temperatures exceed 85°C.
Does LT8608IMSE#PBF support external clock synchronization?
Yes, the LT8608IMSE#PBF supports external clock synchronization via its dedicated SYNC pin. When driven with a TTL/CMOS clock signal, the device synchronizes its switching frequency to the external source while operating in pulse-skipping mode - enabling deterministic EMI reduction and timing coordination with other system clocks.
How does the TR/SS pin function in LT8608IMSE#PBF?
The TR/SS pin on the LT8608IMSE#PBF serves dual functions: soft-start control and output voltage tracking. An external capacitor to ground sets the output voltage ramp rate during startup, while connecting to another regulator's output enables coordinated power sequencing - both critical for FPGA and multi-rail processor systems.
What is the minimum input voltage required for LT8608IMSE#PBF to regulate?
The LT8608IMSE#PBF requires a minimum input voltage of 2.5V (typical) to maintain regulation, with 3.0V specified as the guaranteed minimum across temperature. Below this threshold, the internal UVLO circuit disables switching, and the device draws only 1µA - ensuring safe operation during brownout conditions.
Can LT8608IMSE#PBF be used in spread-spectrum mode?
Yes, the LT8608IMSE#PBF supports spread-spectrum frequency modulation when the SYNC pin is biased between 3.2V and 5.0V. This modulates the switching frequency by ±3kHz, reducing peak EMI emissions without requiring additional filtering components - a key advantage in compact, noise-sensitive designs.
LT8608IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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
LT8608IMSE#PBF FAQ
1.How can I place an order for LT8608IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608IMSE#PBF 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 LT8608IMSE#PBF reliable?
The price and inventory of LT8608IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8608IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608IMSE#PBF?
LT8608IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608IMSE#PBF 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 LT8608IMSE#PBF?
For technical support, including LT8608IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608IMSE#PBF requirements.
6.How does Aetrix verify that LT8608IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8608IMSE#PBF 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 LT8608IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8608IMSE#PBF?
All LT8608IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608IMSE#PBF, 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 LT8608IMSE#PBF part is unused and in its original packaging.
Return procedure for LT8608IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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