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Analog Devices Inc. LT8610AHMSE#PBF
- Part No.:
- LT8610AHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610AHMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,841
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Product details
Overview
LT8610AHMSE#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current, 30ns minimum on-time, and AEC-Q100 qualification for automotive applications. It operates across 3.4V–42V input, delivers fixed 3.3V or 5V output (this variant is pin-compatible with both), and achieves 95% efficiency at 1A/5V from 12V input in continuous conduction mode.
For engineers reviewing the LT8610AHMSE#PBF datasheet, LT8610AHMSE#PBF pinout, LT8610AHMSE#PBF application, or LT8610AHMSE#PBF equivalent, key selection criteria include ultralow IQ regulation under light load, thermal robustness to 150°C junction, EMI-optimized Silent Switcher architecture, and compatibility with BIAS pin biasing for improved efficiency.
Technical Context
The LT8610AHMSE#PBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) via RT pin resistor. Its internal 0.97V reference regulates FB or VOUT directly, and it features integrated top/bottom NMOS power switches with 120mΩ/65mΩ on-resistance and 6.7A/4.3A current limits respectively.
Burst Mode® operation enables 2.5µA IQ regulation at no load, while pulse-skipping mode (enabled via SYNC pin) maintains full-frequency operation under dynamic loads. The device includes EN/UV with 1.0V threshold, PG flag with ±9% output monitoring, and soft-start/tracking via TR/SS pin with 2.2µA internal pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank (≥3.4V min) and load-dump (≤42V max). |
| Max Output Current | 3.5A - sustains full-rated load continuously at TJ ≤ 150°C with proper PCB thermal design (θJA = 40°C/W). |
| Quiescent Current | 2.5µA - enables >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Min On-Time | 30ns - allows high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse skipping, critical for compact EMI-filtered designs. |
| Output Accuracy | ±1.5% over temp - ensures reliable microcontroller core voltage regulation across –40°C to +150°C junction range. |
| Switching Frequency | 200kHz–2.2MHz - programmable via RT pin; avoids AM radio band and enables small magnetics in space-constrained ECUs. |
| Thermal Rating | –40°C to +150°C junction - qualified per AEC-Q100 Grade H, suitable for under-hood power conversion. |
Pinout & Package
LT8610AHMSE#PBF uses a thermally enhanced 16-lead plastic MSOP package with exposed GND pad (Pin 17). The package provides θJA = 40°C/W and θJC(PAD) = 10°C/W, requiring soldered thermal pad for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Ground for low-ripple Burst Mode; tie to INTVCC or logic high for pulse-skipping; enables EMI reduction via frequency dithering. |
| TR/SS (2) | Soft-start & tracking control | Capacitor-programmed ramp rate; internal 2.2µA pull-up enables precise startup sequencing with other rails. |
| RT (3) | Frequency programming | Resistor-to-GND sets oscillator frequency; determines inductor size, efficiency trade-off, and EMI profile. |
| EN/UV (4) | Enable & input UVLO | 1.0V threshold with 40mV hysteresis; supports programmable VIN undervoltage lockout using external divider. |
| VIN (5,6) | Main power input | Dual pins reduce IR drop and improve high-current routing; must be locally bypassed with low-ESR ceramic capacitor. |
| NC (7) | No connect | Internally unconnected; leave floating or ground per layout best practice (no electrical function). |
| GND (8) | Power & signal ground | Return path for bottom switch; must be tied to exposed pad (Pin 17) for thermal and electrical integrity. |
| SW (9,10,11) | Power switch node | High-di/dt node connecting to inductor and BST capacitor; requires minimal loop area to suppress EMI. |
| BST (12) | Bootstrap supply | Drives top NMOS gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies internal logic; draws current from BIAS if VBIAS > 3.1V. |
| BIAS (14) | Efficiency-boosting bias supply | Tie to VOUT (≥3.3V) to reduce VIN current draw and improve light-load efficiency by ~10–15%. |
| PG (15) | Power good flag | Open-drain output signaling VOUT within ±9% of target; valid above 3.4V VIN regardless of EN state. |
| VOUT (16) | Regulated output | Fixed 3.3V or 5V output (model-dependent); connects internally to 14.3MΩ or 12.5MΩ feedback divider - no external resistors needed. |
| GND (17) | Exposed thermal pad | Mandatory solder connection to PCB ground plane; primary thermal path for 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use up to 150°C junction temperature with zero defects in HTOL and TC testing. |
| 2.5µA ultralow quiescent current | Enables >10-year battery standby in always-on systems (e.g., CAN gateway, body control modules) without wake-up leakage penalty. |
| 30ns minimum on-time | Supports direct 42V-to-3.3V conversion at 2MHz, eliminating intermediate stages and reducing bill-of-materials count. |
| Integrated BIAS pin functionality | Reduces total system power loss by shifting internal regulator load from VIN to VOUT, improving light-load efficiency by up to 15%. |
| Silent Switcher® architecture | Minimizes EMI emissions via balanced SW node layout and integrated bootstrap capacitor, easing CISPR-25 Class 5 compliance. |
| Robust fault protection | Includes thermal shutdown, overcurrent limiting (top/bottom FET), and PG-flagged output monitoring - no external supervision required. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DDR memory, and display interface in head-unit or digital cluster with cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering stable rail during 3.4V–42V battery transients. Use Value: 2.5µA IQ extends backup battery life; 150°C rating enables placement near heat-generating processors; AEC-Q100 assurance reduces validation burden. | Use Scenario: Providing clean, low-noise 3.3V supply to image sensor and ISP in rear-view or surround-view camera. IC Role / Device Role / Timing Role: High-efficiency, low-EMI point-of-load regulator with fast transient response to pixel data bursts. Use Value: Silent Switcher® design meets strict CISPR-25 radiated emissions limits; 30ns on-time supports compact 2MHz filter design. |
| Industrial Telematics Gateway | Commercial Vehicle Control Unit |
Use Scenario: Powering LTE modem, GPS receiver, and microcontroller in fleet management gateway operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Main DC/DC converter handling 9V–36V nominal truck battery with load-dump tolerance. Use Value: 42V absolute max rating withstands 300ms load-dump pulses; PG flag enables firmware-level power health monitoring. | Use Scenario: Regulating 5V for CAN transceivers, microcontrollers, and solenoid drivers in engine control or transmission modules. IC Role / Device Role / Timing Role: High-reliability buck regulator with extended temperature support and built-in UVLO/OTP. Use Value: AEC-Q100 Grade H certification satisfies OEM functional safety requirements; exposed pad ensures thermal margin in sealed enclosures. |
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 |
|---|---|---|---|
| LT8610ABHMSE#PBF | Same package and temp grade, but LT8610AB variant offers 91% light-load efficiency (vs 82% for LT8610A) at cost of higher output ripple in Burst Mode. | Preferred where battery runtime dominates over output noise sensitivity (e.g., telematics trackers), not where low-noise analog rails are required. | Select LT8610ABHMSE#PBF only if measured output ripple with chosen COUT meets system ADC/sensor requirements. |
| LM61480RQWR | TI 42V/5A buck with 15µA IQ, 45ns min on-time, and -40°C to 150°C rating; lacks BIAS pin and AEC-Q100 documentation. | Acceptable for industrial-grade automotive peripherals where AEC-Q100 is not mandated, but requires external compensation and has higher IQ. | Choose LM61480RQWR only if footprint compatibility and TI supply chain preference outweigh need for certified automotive reliability and lowest IQ. |
Compared with LT8610ABHMSE#PBF, the LT8610AHMSE#PBF trades 9% light-load efficiency for lower output ripple and tighter regulation - critical for noise-sensitive imaging or audio subsystems. Versus LM61480RQWR, it delivers proven AEC-Q100 compliance and 6× lower quiescent current, justifying its use in safety-critical or battery-limited automotive nodes.
Availability
LT8610AHMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics gateways requiring stable component supply, AEC-Q100 qualification, and extended temperature operation.
Supply support for LT8610AHMSE#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 automotive, industrial, communications, and healthcare markets.
The LT8610A/LT8610AB series was designed specifically for automotive power conversion - emphasizing ultralow IQ, high temperature resilience, EMI robustness, and AEC-Q100 compliance in compact MSOP packages.
FAQ
What is the maximum junction temperature rating for the LT8610AHMSE#PBF?
The LT8610AHMSE#PBF is rated for operation up to +150°C junction temperature and is fully specified and guaranteed across –40°C to +150°C. This Grade H qualification meets AEC-Q100 requirements for under-hood automotive applications, and the exposed thermal pad (Pin 17) must be soldered to the PCB ground plane to achieve the specified θJC = 10°C/W thermal resistance.
Does the LT8610AHMSE#PBF require external feedback resistors for fixed-output versions?
No, the LT8610AHMSE#PBF does not require external feedback resistors. As a fixed-output variant (either 3.3V or 5V), it integrates internal resistor dividers - 14.3MΩ for 3.3V models and 12.5MΩ for 5V models - directly connecting VOUT to the error amplifier reference. This eliminates resistor tolerance errors and reduces board space and BOM count.
How does the BIAS pin improve efficiency in the LT8610AHMSE#PBF?
The BIAS pin on the LT8610AHMSE#PBF allows the internal 3.4V regulator to draw current from VOUT (when ≥3.3V) instead of VIN, reducing input supply current and improving light-load efficiency by up to 15%. For a 5V-output design, tying BIAS to VOUT lowers total system power dissipation and extends battery life in always-on automotive modules.
Can the LT8610AHMSE#PBF synchronize to an external clock, and what are the voltage thresholds?
Yes, the LT8610AHMSE#PBF supports external clock synchronization via the SYNC pin (Pin 1). The SYNC pin accepts logic-level inputs with falling threshold of 0.8V and rising threshold of 1.4V. When driven with a clean external clock, the device aligns positive SW transitions to the clock edge and disables frequency foldback, enabling deterministic EMI reduction in synchronized multi-rail systems.
What protection features are integrated into the LT8610AHMSE#PBF?
The LT8610AHMSE#PBF integrates overtemperature shutdown, cycle-by-cycle peak current limiting on both top and bottom MOSFETs (6.7A/4.3A typical), input undervoltage lockout (EN/UV pin), and output power-good monitoring (PG pin). These features eliminate the need for external supervisors or current-sense amplifiers in most automotive and industrial applications.
LT8610AHMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610AHMSE#PBF FAQ
1.How can I place an order for LT8610AHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610AHMSE#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 LT8610AHMSE#PBF reliable?
The price and inventory of LT8610AHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610AHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610AHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610AHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610AHMSE#PBF?
LT8610AHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610AHMSE#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 LT8610AHMSE#PBF?
For technical support, including LT8610AHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610AHMSE#PBF requirements.
6.How does Aetrix verify that LT8610AHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610AHMSE#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 LT8610AHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610AHMSE#PBF?
All LT8610AHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610AHMSE#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 LT8610AHMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610AHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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