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Analog Devices Inc. LT8610AHMSE-3.3#PBF
- Part No.:
- LT8610AHMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610AHMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:134
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Product details
Overview
LT8610AHMSE-3.3#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, fixed 3.3V output, and 30ns minimum on-time. It operates across –40°C to 150°C junction temperature, features integrated top/bottom NMOS switches, and delivers <10mVP-P output ripple in LT8610A variants for automotive power rail regulation.
For engineers reviewing the LT8610AHMSE-3.3#PBF datasheet, LT8610AHMSE-3.3#PBF pinout, LT8610AHMSE-3.3#PBF application, or LT8610AHMSE-3.3#PBF equivalent, key selection criteria include ultralow IQ at light load, AEC-Q100 qualification, thermal robustness up to 150°C, and compatibility with 3.3V fixed-output automotive subsystems requiring high efficiency under wide input (3.4–42V) and transient conditions.
Technical Context
The LT8610AHMSE-3.3#PBF implements constant-frequency current-mode control with RT-programmable switching frequency (200kHz–2.2MHz), internal 0.97V reference, and synchronous rectification. Its architecture includes integrated 120mΩ top/65mΩ bottom NMOS switches, programmable soft-start via TR/SS pin, and ±9% power-good monitoring referenced to VOUT.
Burst Mode operation enables 2.5µA input quiescent current at no load while maintaining regulation; pulse-skipping mode activates when SYNC is pulled high or driven externally. The device supports bias supply from VOUT (≥3.3V) to reduce VIN current draw and includes overtemperature protection with thermal shutdown at >150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over full temperature and line/load range - eliminates external feedback resistors and ensures stable rail for MCU I/O or CAN transceivers. |
| Max Output Current | 3.5A continuous - supports high-current automotive modules like ADAS sensors or infotainment processors without external current boosting. |
| Input Voltage Range | 3.4V to 42V - accommodates cold-crank (4.5V), start-stop (6V), and load-dump (40V+) conditions in 12V vehicle systems. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT in Burst Mode - enables always-on functionality in telematics or alarm systems with multi-year battery life. |
| Min On-Time | 30ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping, critical for compact EMI-optimized designs. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H, suitable for under-hood placement near engine control units. |
| Package | 16-lead MSOP with exposed thermal pad - θJA = 40°C/W enables 3.5A operation without forced air in space-constrained automotive PCBs. |
Pinout & Package
LT8610AHMSE-3.3#PBF uses a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed GND pad (Pin 17) that must be soldered to PCB for thermal performance. Pin 7 is NC; Pins 5/6 and 9/10/11 are paralleled VIN and SW terminals respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Ground for low-ripple Burst Mode; tie to INTVCC or logic high for pulse-skipping; disables frequency foldback when driven externally. |
| TR/SS (2) | Soft-start and output tracking control | Capacitor here sets VOUT ramp rate; internal 2.2µA pull-up enables simple soft-start; pulled low during fault for safe discharge. |
| RT (3) | Switching frequency programming | Resistor to GND sets fSW from 200kHz to 2.2MHz - enables EMI optimization and inductor size reduction. |
| EN/UV (4) | Enable and input undervoltage lockout | 1.0V threshold with 40mV hysteresis - allows precise brown-out protection or system-level enable sequencing. |
| VIN (5,6) | Main input power supply | Paralleled pins handle high peak currents; require local 1µF ceramic bypass close to pins to suppress switching noise. |
| NC (7) | No connect | Not bonded internally - leave unconnected; no routing or copper required. |
| GND (8) | Power and signal ground return | Return path for bottom switch; must be tied to exposed pad (Pin 17) for thermal and electrical integrity. |
| SW (9,10,11) | Switch node connection | High dv/dt node connecting to inductor and BST capacitor; requires minimal PCB area and tight layout to minimize EMI. |
| BST (12) | Bootstrap supply for top switch gate drive | Requires 0.1µF ceramic capacitor to SW - critical for reliable 120mΩ top FET turn-on across input range. |
| INTVCC (13) | Internal 3.4V regulator bypass | Decouple with ≥1µF ceramic to GND; supplies internal logic; draws current from BIAS if >3.1V, else from VIN. |
| BIAS (14) | Bias supply input | Tie directly to VOUT (3.3V) to reduce VIN current and improve light-load efficiency - mandatory for optimal IQ performance. |
| PG (15) | Power-good open-drain flag | Asserts high when VOUT is within ±9% of 3.3V and no faults - used for processor reset or system power sequencing. |
| VOUT (16) | Regulated 3.3V output | Fixed-output pin with internal 14.3MΩ feedback divider - no external resistors needed; connects to bulk output capacitors. |
| GND (17) | Exposed thermal pad | Must be soldered to large PCB copper pour - reduces θJC to 10°C/W and enables full 3.5A rating at 150°C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use up to 150°C junction temperature with full reliability testing per stress test plan. |
| Ultralow 2.5µA quiescent current | Enables >10-year battery life in always-on vehicle modules by minimizing standby power loss at 12V input. |
| 30ns minimum on-time | Supports high-frequency, high-ratio conversion (e.g., 42V→3.3V @ 2MHz) without duty-cycle limitation or instability. |
| Integrated 120mΩ/65mΩ MOSFETs | Eliminates external power devices and gate drivers - reduces BOM count, layout area, and thermal complexity. |
| ±9% power-good monitoring | Provides precise, temperature-stable output validation for safety-critical subsystems like ADAS camera power rails. |
| BIAS pin for efficiency optimization | Routing VOUT to BIAS cuts VIN current draw by >50% at light loads - essential for meeting OEM quiescent power targets. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display driver, and audio codec in head-unit systems with stop-start and load-dump transients. IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering regulated rail with fast transient response and low EMI. Use Value: 3.5A capability supports burst current demands of GPU rendering; 2.5µA IQ extends battery backup time during ignition-off. | Use Scenario: Supplies image sensor and ISP in forward-facing camera with strict thermal and ripple requirements. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator providing clean 3.3V rail with <10mVP-P ripple and ±9% PG accuracy. Use Value: 150°C rating allows placement near hot CMOS sensor; 30ns min-on-time enables compact 2MHz design for reduced filter size. |
| Telematics Control Unit (TCU) | Industrial Vehicle Telematics |
Use Scenario: Powers LTE modem, GNSS receiver, and microcontroller in cellular-connected vehicle trackers. IC Role / Device Role / Timing Role: Always-on 3.3V supply with ultra-low IQ and robust cold-crank support down to 3.4V. Use Value: 2.5µA IQ enables >5-year coin-cell backup life; 42V max input withstands 35V load-dump spikes per ISO 7637-2. | Use Scenario: Provides main 3.3V rail for GPS/GNSS modules in construction and agricultural machinery with wide ambient temps. IC Role / Device Role / Timing Role: High-reliability buck converter operating continuously at 125°C ambient with derated 3.5A output. Use Value: AEC-Q100 Grade H qualification ensures lifetime reliability in harsh off-road vibration and thermal cycling environments. |
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-3.3#PBF | Same package and pinout; improved light-load efficiency (91% vs 82% at 1mA) but higher output ripple in Burst Mode. | Better suited for battery-powered modules where efficiency > ripple is prioritized; not drop-in due to different current limit behavior. | Select LT8610ABHMSE-3.3#PBF only if system can tolerate increased ripple and benefits from higher light-load efficiency. |
| LM61480RQWR | 42V, 8A, 1.5µA IQ, 3.3V fixed; different pinout (16-pin WQFN), no BIAS pin, lower RDS(on) (40mΩ/22mΩ). | Higher current and lower IQ, but lacks AEC-Q100 qualification and thermal grade - limited to industrial/commercial use. | Choose LM61480RQWR for non-automotive applications needing higher current or lower IQ, but verify thermal margin without Grade H rating. |
Compared with LT8610ABHMSE-3.3#PBF, the LT8610AHMSE-3.3#PBF offers lower output ripple and predictable Burst Mode behavior, while LM61480RQWR provides higher current and lower IQ but lacks automotive qualification and thermal robustness - making LT8610AHMSE-3.3#PBF the optimal choice for AEC-Q100-compliant 3.5A automotive rails.
Availability
LT8610AHMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with AEC-Q100 compliance and extended temperature operation.
Supply support for LT8610AHMSE-3.3#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 - delivering ultralow IQ, wide input range, AEC-Q100 qualification, and robust thermal performance in compact MSOP packages.
FAQ
What is the maximum junction temperature rating for the LT8610AHMSE-3.3#PBF?
The LT8610AHMSE-3.3#PBF is guaranteed over the full –40°C to +150°C junction temperature range per AEC-Q100 Grade H qualification. This rating enables direct placement in high-ambient locations such as near engine control units or under-hood telematics modules without derating, provided the exposed pad is properly soldered and thermal vias are implemented.
How does the BIAS pin affect efficiency in the LT8610AHMSE-3.3#PBF?
The BIAS pin on the LT8610AHMSE-3.3#PBF must be tied to VOUT (3.3V) to source internal circuitry current from the output rail instead of VIN. This reduces input current draw by >50% at light loads and improves overall efficiency - especially critical for meeting OEM quiescent power budgets in always-on automotive modules.
Can the LT8610AHMSE-3.3#PBF operate during cold-crank conditions?
Yes, the LT8610AHMSE-3.3#PBF supports input voltages as low as 3.4V, enabling reliable operation during automotive cold-crank events where battery voltage drops to ~4.5V. Its 30ns minimum on-time and current-mode control maintain regulation and stability even at extreme duty cycles required for 4.5V→3.3V conversion.
What is the purpose of the TR/SS pin on the LT8610AHMSE-3.3#PBF?
The TR/SS pin on the LT8610AHMSE-3.3#PBF controls output voltage ramp rate during startup and enables output tracking. A capacitor connected to this pin sets soft-start time; an internal 2.2µA pull-up current allows simple RC timing. During fault or shutdown, the pin is actively pulled low to safely discharge output capacitance.
Is the LT8610AHMSE-3.3#PBF pin-compatible with other members of the LT8610A/LT8610AB family?
Yes, the LT8610AHMSE-3.3#PBF shares identical pinout and package with all LT8610A and LT8610AB variants in the MSE package, including LT8610ABHMSE-3.3#PBF and LT8610AHMSE-5#PBF. However, functional differences - such as Burst Mode behavior, current limits, and efficiency curves - require verification against specific application requirements before substitution.
LT8610AHMSE-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3#PBF FAQ
1.How can I place an order for LT8610AHMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610AHMSE-3.3#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-3.3#PBF reliable?
The price and inventory of LT8610AHMSE-3.3#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-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8610AHMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610AHMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610AHMSE-3.3#PBF?
LT8610AHMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610AHMSE-3.3#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-3.3#PBF?
For technical support, including LT8610AHMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610AHMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT8610AHMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610AHMSE-3.3#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-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8610AHMSE-3.3#PBF?
All LT8610AHMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610AHMSE-3.3#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-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8610AHMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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