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Analog Devices Inc. LT8608EMSE#PBF
- Part No.:
- LT8608EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8608EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,087
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Product details
Overview
LT8608EMSE#PBF 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 while maintaining <10mVP-P ripple and >92% efficiency at 0.5A. Its 35ns minimum on-time enables high VIN/VOUT ratios in compact power supplies.
For engineers reviewing the LT8608EMSE#PBF datasheet, LT8608EMSE#PBF pinout, LT8608EMSE#PBF application, or LT8608EMSE#PBF equivalent, key selection factors include ultralow IQ regulation, 200kHz–2.2MHz programmable switching frequency, SYNC-controlled Burst/Pulse-Skipping modes, ±8.5% PG flag accuracy, and MSOP-10 thermal performance with exposed pad.
Technical Context
The LT8608EMSE#PBF implements constant-frequency peak current mode control with internal 0.778V reference and slope compensation. Its oscillator is resistor-programmed (RT pin) from 200kHz to 2.2MHz and supports external synchronization, spread-spectrum modulation, or Burst Mode via the SYNC pin - exclusive to the MSOP package.
It integrates top/bottom NMOS switches (350mΩ/230mΩ), features accurate 1V EN/UV threshold with 50mV hysteresis, and provides output tracking/soft-start via TR/SS pin. The PG open-drain flag asserts when VOUT deviates >±8.5% from regulation or during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive and industrial input rails with dropout operation down to 2.5V. |
| Quiescent Current | 1.7µA (typical) in Burst Mode - enables >10-year battery life in always-on IoT sensors and telematics. |
| Output Current | 1.5A continuous - sustains full load at 125°C junction temperature with proper PCB thermal design. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between small 2.2µH inductors and high efficiency at light loads. |
| Feedback Reference | 0.778V ±12mV - enables precise 3.3V/5V/12V outputs using standard 1% resistors with minimal divider current. |
| Minimum On-Time | 35ns (typical) - supports 12V-to-3.3V conversion at 2MHz without pulse skipping or duty cycle limitation. |
| PG Accuracy | ±8.5% of VFB - provides reliable power-good signaling for FPGA/CPU reset sequencing and system health monitoring. |
Pinout & Package
LT8608EMSE#PBF uses a 10-lead MSOP package with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to PCB ground plane to achieve θJA = 40°C/W and sustain 1.5A continuous output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply | Drives top NMOS gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC for stable high-side switching. |
| SW | Power switch node | Connects to inductor and BST capacitor; must be minimized in PCB area to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Requires ≥1µF low-ESR ceramic capacitor to ground; powers internal logic and drivers; not for external loading. |
| RT | Frequency programming | Resistor to GND sets switching frequency (e.g., 18.2kΩ = 2MHz); determines inductor size and light-load efficiency trade-off. |
| SYNC | Mode control & sync input | Ground = Burst Mode; float = Pulse-Skipping; INTVCC/high = Spread Spectrum; no function in DFN variants. |
| EN/UV | Enable & UVLO input | 1.05V rising threshold enables startup; 50mV hysteresis prevents chatter; resistor divider programs custom VIN UVLO. |
| TR/SS | Tracking & soft-start | 2µA internal pull-up enables capacitor-programmed slew rate; supports output voltage sequencing in multi-rail systems. |
| PG | Power-good flag | Open-drain output pulled low if VOUT outside ±8.5% or fault occurs; valid above 3.2V VIN regardless of EN state. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider tap; 10pF phase-lead cap recommended with high-value dividers. |
| GND | Power & signal ground | Exposed pad (Pin 11) is primary thermal path and must be soldered to large PCB ground plane for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 1.7µA at light loads while holding output ripple <10mVP-P, enabling decade-long battery operation. |
| Programmable spread-spectrum modulation | Lowers peak EMI by ±3kHz modulation when SYNC is tied to 3.2–5V, easing CISPR 25 Class 5 compliance in automotive designs. |
| Fast transient response | Peak current mode + internal compensation achieves <50µs recovery from 0.5A→1A load step with minimal output deviation. |
| Low dropout capability | Supports 100% duty cycle operation; maintains regulation down to VIN = VOUT + VSW(BOT) ≈ VOUT + 350mV at full load. |
| Robust protection suite | Includes overtemperature shutdown, cycle-by-cycle current limiting (2.1–2.9A), and PG fault reporting for system-level safety. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and MEMS sensor in vehicle cabin modules with 12V battery input. IC Role / Device Role / Timing Role: Primary 42V-input buck regulator delivering clean, low-noise 3.3V at up to 1.2A with ultralow IQ for sleep-mode battery conservation. Use Value: Enables >15-year battery backup life in parked-state monitoring; 2MHz operation allows 2.2µH inductor to fit tight dashboard space constraints. |
Use Scenario: Regulating 5V rail for wireless sensor nodes deployed in remote oil/gas field equipment powered by 24V DC supply. IC Role / Device Role / Timing Role: High-efficiency, wide-VIN step-down converter supporting intermittent RF transmission bursts and long idle periods. Use Value: Achieves >90% efficiency at 500mA load and <2.5µA no-load IQ, extending maintenance-free operation to 10+ years on primary lithium cells. |
| Medical Portable Diagnostic Device | Avionics Subsystem Power |
|
Use Scenario: Generating isolated 3.3V/5V rails for ADCs, displays, and Bluetooth modules in handheld ultrasound units with Li-ion battery input. IC Role / Device Role / Timing Role: Main DC/DC converter providing low-ripple, EMI-optimized power with soft-start and PG signaling for safe boot sequencing. Use Value: Burst Mode ensures <10mVP-P ripple during imaging acquisition; TR/SS pin enables synchronized ramp-up with FPGA configuration. |
Use Scenario: Supplying 5V to flight-critical data acquisition circuits in UAVs where input varies from 28V aircraft bus to 42V transients. IC Role / Device Role / Timing Role: Robust, high-reliability buck regulator with 42V absolute max rating, PG fault detection, and thermal shutdown. Use Value: Withstands MIL-STD-704E voltage spikes; exposed-pad MSOP package meets DO-160D thermal derating requirements up to 125°C ambient. |
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#PBF | Same MSOP-10 package, but rated for 2A output and higher 3.5A current limit; identical 2.5µA IQ and SYNC/TR/SS functionality. | Required for >1.5A loads or higher overload margin; same PCB footprint enables drop-in upgrade path. | Select when output current demand exceeds 1.5A or when additional headroom for transient surges is needed. |
| TPS62130ARGTR | 3A buck with 17µA IQ (not Burst Mode), 3–17V input, 2.5–6V output; QFN-16 package; no SYNC or TR/SS pins. | Suitable for cost-sensitive industrial applications where ultralow IQ is secondary to high current and small solution size. | Choose when 2.5µA IQ is unnecessary and 3A output with integrated LDO post-regulation is preferred over programmable modes. |
Compared with LT8609EMSE#PBF, the LT8608EMSE#PBF offers identical feature set at lower current rating and cost; versus TPS62130ARGTR, it delivers 7× lower quiescent current and advanced control features essential for battery longevity and EMI-sensitive environments.
Availability
LT8608EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor networks, and portable medical devices requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8608EMSE#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 precision, industrial, automotive, and communications markets since 1965.
The LT8608 product line delivers ultralow-IQ synchronous buck regulators for battery-powered and energy-sensitive applications where efficiency at light loads and robustness under wide input voltage swings are critical.
FAQ
What is the guaranteed operating temperature range for LT8608EMSE#PBF?
The LT8608EMSE#PBF is specified for –40°C to 125°C junction temperature. It is characterized and production-tested to meet all electrical specifications across this full range, with thermal performance validated using the exposed pad soldered to PCB ground. Derating applies above 125°C ambient per Analog Devices' reliability guidelines.
Does LT8608EMSE#PBF support external clock synchronization?
Yes, LT8608EMSE#PBF supports external clock synchronization via its dedicated SYNC pin. When driven with a TTL/CMOS clock signal between 200kHz and 2.2MHz, the LT8608EMSE#PBF locks its switching frequency and phase to the external source, reducing EMI peaks and enabling deterministic timing in synchronized power systems.
How does the TR/SS pin function in LT8608EMSE#PBF?
The TR/SS pin on LT8608EMSE#PBF provides dual functionality: soft-start control via an internal 2µA current source charging an external capacitor, and output voltage tracking during power-up sequences. When TR/SS voltage is below 0.778V, the LT8608EMSE#PBF regulates FB to match TR/SS; above that threshold, regulation reverts to the internal reference.
What is the minimum input voltage required for LT8608EMSE#PBF to regulate?
The LT8608EMSE#PBF requires a minimum input voltage of 2.5V (typical) to initiate regulation, though full specification compliance begins at 3.0V. Below 3.0V, functionality is not guaranteed; the device enters undervoltage lockout if EN/UV falls below 0.99V, and PG remains invalid until VIN exceeds 3.2V.
Can LT8608EMSE#PBF operate without an external RT resistor?
No, LT8608EMSE#PBF requires an external RT resistor connected from the RT pin to GND to set its switching frequency. Without it, the oscillator defaults to an undefined state and regulation fails. The RT value determines frequency from 200kHz (221kΩ) to 2.2MHz (16.2kΩ); floating or open-circuit RT is not supported.
LT8608EMSE#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
LT8608EMSE#PBF FAQ
1.How can I place an order for LT8608EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608EMSE#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 LT8608EMSE#PBF reliable?
The price and inventory of LT8608EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8608EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608EMSE#PBF?
LT8608EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608EMSE#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 LT8608EMSE#PBF?
For technical support, including LT8608EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608EMSE#PBF requirements.
6.How does Aetrix verify that LT8608EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8608EMSE#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 LT8608EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8608EMSE#PBF?
All LT8608EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608EMSE#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 LT8608EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8608EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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