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Analog Devices Inc. LT8610ABHMSE#PBF
- Part No.:
- LT8610ABHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ABHMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,208
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Product details
Overview
LT8610ABHMSE#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, and AEC-Q100 qualification for automotive applications. It delivers fixed 5V output in a thermally enhanced 16-lead MSOP package and supports synchronization, soft-start, and power-good signaling.
For engineers reviewing the LT8610ABHMSE#PBF datasheet, LT8610ABHMSE#PBF pinout, LT8610ABHMSE#PBF application, or LT8610ABHMSE#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade thermal performance, and confirmed alternatives for 5V/3.5A high-efficiency DC/DC conversion.
Technical Context
The LT8610ABHMSE#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/VOUT with ±9% PG threshold and features frequency foldback during start-up or overcurrent to limit inductor current.
It integrates top and bottom NMOS power switches (120mΩ/65mΩ typical RDS(on)), supports BIAS pin operation for reduced VIN current when VOUT ≥ 3.3V, and uses an internal 2.2µA TR/SS pull-up for capacitor-programmed soft-start. The LT8610AB variant improves light-load efficiency over LT8610A at the cost of higher Burst Mode ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank (≥4.5V) and load-dump (≤42V). |
| Output Current | 3.5A continuous - sufficient for powering infotainment SoCs, ADAS sensors, or multi-rail PMICs without external boost. |
| Quiescent Current | 2.5µA at no load - enables >1-year battery life in always-on automotive modules (e.g., telematics wake-on-LIN). |
| Minimum On-Time | 30ns - allows high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT pin; 700kHz typical in 5V/3.5A designs to balance EMI and inductor size. |
| Output Ripple | <10mVP-P (LT8610A only); LT8610AB has higher ripple in Burst Mode but achieves 91% efficiency at 1mA - trade-off optimized for ultra-low IQ. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H; enables under-hood placement without derating. |
Pinout & Package
LT8610ABHMSE#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The package delivers θJA = 40°C/W and θJC(PAD) = 10°C/W, enabling high-power operation in compact automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock input | Ground for low-ripple Burst Mode; tie to INTVCC or logic high for pulse-skipping; enables EMI reduction via spread-spectrum sync. |
| TR/SS (2) | Soft-start & tracking control | Capacitor-programmed voltage ramp; internal 2.2µA pull-up enables precise startup slew rate control for sequencing-sensitive loads. |
| RT (3) | Frequency programming | Resistor-to-GND sets fSW; 60.4kΩ yields ~700kHz - optimal for 4.7µH inductors and minimal EMI filtering. |
| EN/UV (4) | Enable & undervoltage lockout | 1.0V rising threshold with 40mV hysteresis - allows clean system-level power sequencing and battery brown-out protection. |
| VIN (5,6) | Main input supply | Dual pins reduce IR drop and improve thermal path; requires local 1µF ceramic bypass near pins. |
| NC (7) | No connect | Not internally bonded - must remain unconnected; no routing or copper fill required. |
| GND (8) | Power ground return | Return path for bottom switch; must be tied to exposed pad (Pin 17) with multiple vias for thermal and EMI integrity. |
| SW (9,10,11) | Switch node | High-current connection to inductor and BST capacitor; requires minimized loop area to suppress radiated EMI. |
| BST (12) | Bootstrap supply | Drives top FET gate above VIN; requires 0.1µF X7R ceramic placed <1mm from pin for reliable high-side conduction. |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies gate drivers and control logic; sourced from BIAS if VBIAS > 3.1V. |
| BIAS (14) | Efficiency-optimized bias supply | Tie directly to VOUT (5V) to reduce VIN current draw and improve full-load efficiency by ~1–2%. |
| PG (15) | Power-good flag | Open-drain output signals VOUT within ±9% of regulation - used for processor reset assertion or downstream enable sequencing. |
| VOUT (16) | Fixed 5V regulated output | Internal 12.5MΩ feedback divider sets 5.00V ±0.5%; no external resistors needed - simplifies layout and improves accuracy vs. external dividers. |
| GND (17) | Exposed thermal pad | Mandatory solder connection to PCB ground plane; primary thermal path - failure to solder causes >30°C junction rise at 3.5A. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation - enables direct integration into engine control units and radar modules without external derating. |
| 2.5µA quiescent current | Enables >10-year shelf life in battery-backed automotive modules (e.g., toll tags, smart keys) with no sleep-state firmware overhead. |
| 30ns minimum on-time | Supports 42V→5V conversion at 2MHz without duty-cycle limitation - eliminates need for pre-regulator stages in high-input systems. |
| Integrated 5V fixed output | Removes external feedback resistors and associated tolerance/temperature drift - improves output accuracy to ±1.5% over temperature and line. |
| Synchronization capability | Allows alignment to system clock or spread-spectrum source - reduces peak EMI by >10dB in CISPR-25 Class 5 automotive testing. |
| BIAS pin efficiency optimization | Reduces total input current by up to 15% at full load when VOUT ≥ 3.3V - lowers thermal stress on upstream converters or battery drain. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit systems with 12V battery input and strict EMC requirements. IC Role / Device Role / Timing Role: Primary 5V/3.5A buck converter delivering stable rail with <10mV ripple and fast transient response to CPU load steps. Use Value: AEC-Q100 Grade H rating ensures reliability under hood temperature cycling; SYNC pin enables EMI compliance with infotainment clock domain. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules with always-on wake capability. IC Role / Device Role / Timing Role: Always-on 5V regulator maintaining 2.5µA IQ during vehicle sleep mode while supporting instant wake-on-LIN trigger. Use Value: Ultra-low quiescent current extends 12V battery life beyond 1 year in parked state; PG signal validates rail before sensor initialization. |
| Industrial Telematics Gateway | Electric Vehicle Battery Management Interface |
|
Use Scenario: Provides isolated 5V rail for LTE modem, GPS receiver, and CAN transceiver in fleet-tracking gateways operating across 9–36V battery range. IC Role / Device Role / Timing Role: Wide-input buck converter handling cold-crank (4.5V) and load-dump (42V) events without shutdown or reset. Use Value: 42V absolute max rating and robust UVLO hysteresis prevent brown-outs during engine start; TR/SS enables controlled modem power-up sequencing. |
Use Scenario: Powers microcontroller, isolators, and analog front-end in BMS slave boards located near high-voltage battery packs. IC Role / Device Role / Timing Role: High-temp-rated 5V supply operating continuously at 125°C ambient with thermal shutdown protection. Use Value: 150°C junction rating and exposed-pad thermal design allow direct mounting on BMS PCB without heatsink - reducing bill-of-materials cost. |
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 |
|---|---|---|---|
| LT8610AHMSE#PBF | Same package and pinout; LT8610A variant with 3.5A/30ns specs but lower light-load efficiency (82% vs 91% at 1mA). | Lacks LT8610AB's improved Burst Mode efficiency - suitable where lowest possible ripple is prioritized over battery life. | Select when output voltage stability under light load is critical and system can tolerate higher IQ. |
| LT8640SHE#PBF | 42V, 6A, 2.5µA IQ, same 30ns min on-time, but in 20-lead 4mm × 4mm LQFN; includes spread-spectrum modulation. | Higher current capability and integrated EMI reduction features - targets next-gen ADAS ECUs requiring >4A rails. | Choose when future-proofing for higher load growth or stricter CISPR-25 Class 5 EMI limits is required. |
Compared with LT8610AHMSE#PBF, the LT8610ABHMSE#PBF delivers 9% higher efficiency at 1mA load for extended battery runtime, while LT8640SHE#PBF offers 71% more output current and built-in spread-spectrum - making it ideal for scalable platforms where thermal headroom and EMI margin are constrained.
Availability
LT8610ABHMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics gateways requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8610ABHMSE#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 and industrial applications demanding ultra-low quiescent current, wide input range, and AEC-Q100 reliability - targeting always-on subsystems in harsh environments.
FAQ
What is the maximum input voltage rating for the LT8610ABHMSE#PBF?
The LT8610ABHMSE#PBF has an absolute maximum input voltage rating of 42V on the VIN pins, as specified in the Absolute Maximum Ratings table. This rating enables reliable operation during automotive load-dump transients. Continuous operation above 42V risks permanent damage. The device operates down to 3.4V minimum input, supporting cold-crank conditions. Always verify input transient protection circuitry meets ISO 7637-2 Pulse 5a requirements when using LT8610ABHMSE#PBF in automotive designs.
Does the LT8610ABHMSE#PBF require external feedback resistors for 5V output?
No, the LT8610ABHMSE#PBF does not require external feedback resistors for 5V output. It integrates a precision 12.5MΩ internal feedback divider that regulates the VOUT pin to 5.00V ±0.5%. This eliminates resistor tolerance errors, temperature drift, and layout sensitivity associated with external dividers - improving long-term output accuracy and simplifying PCB design. External resistors are only needed if a non-standard output voltage is required using the FB pin configuration.
How does the BIAS pin improve efficiency in the LT8610ABHMSE#PBF?
The BIAS pin on the LT8610ABHMSE#PBF sources internal circuitry current from VOUT instead of VIN when VBIAS ≥ 3.1V. Since the LT8610ABHMSE#PBF outputs 5V, connecting BIAS directly to VOUT reduces the effective input current draw by bypassing the internal LDO's dropout loss. This improves full-load efficiency by approximately 1–2% and lowers thermal dissipation on upstream power stages - a critical advantage in space-constrained automotive modules where thermal management is challenging.
What is the purpose of the exposed thermal pad (Pin 17) on the LT8610ABHMSE#PBF?
The exposed thermal pad (Pin 17) on the LT8610ABHMSE#PBF is electrically and thermally connected to GND and serves as the primary heat dissipation path. With θJC(PAD) = 10°C/W, proper soldering to a large PCB ground plane via ≥4 thermal vias is mandatory to maintain junction temperature below 150°C at 3.5A. Failure to solder the pad results in >30°C junction temperature rise, triggering thermal shutdown and compromising AEC-Q100 reliability. The pad must not be left floating or insulated.
Can the LT8610ABHMSE#PBF synchronize to an external clock, and what are the voltage thresholds?
Yes, the LT8610ABHMSE#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, allowing compatibility with standard CMOS or LVCMOS clocks. When synchronized, the device disables Burst Mode and operates in pulse-skipping mode with SW transitions aligned to the external clock edge - enabling deterministic EMI reduction and timing coordination with system processors or other converters in the same domain.
LT8610ABHMSE#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 ~ 2.24MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610ABHMSE#PBF FAQ
1.How can I place an order for LT8610ABHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ABHMSE#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 LT8610ABHMSE#PBF reliable?
The price and inventory of LT8610ABHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610ABHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ABHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ABHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ABHMSE#PBF?
LT8610ABHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ABHMSE#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 LT8610ABHMSE#PBF?
For technical support, including LT8610ABHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ABHMSE#PBF requirements.
6.How does Aetrix verify that LT8610ABHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ABHMSE#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 LT8610ABHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ABHMSE#PBF?
All LT8610ABHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ABHMSE#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 LT8610ABHMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610ABHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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