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Analog Devices Inc. LT8610AIMSE-3.3#PBF
- Part No.:
- LT8610AIMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610AIMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,523
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Product details
Overview
LT8610AIMSE-3.3#PBF from Analog Devices is a 42V input, 3.5A synchronous step-down regulator with fixed 3.3V output, 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, and AEC-Q100 qualification for automotive applications. It operates across –40°C to 125°C and delivers low-noise regulation for battery-powered industrial and automotive systems.
For engineers reviewing the LT8610AIMSE-3.3#PBF datasheet, LT8610AIMSE-3.3#PBF pinout, LT8610AIMSE-3.3#PBF application, or LT8610AIMSE-3.3#PBF equivalent, key selection criteria include ultralow IQ under light load, fixed-output accuracy (±0.6% over temperature), EMI-optimized Silent Switcher architecture, and compatibility with 3.3V bias supply for enhanced efficiency.
Technical Context
The LT8610AIMSE-3.3#PBF implements constant-frequency current-mode control with internal 0.97V reference and integrated top/bottom NMOS power switches (120mΩ/65mΩ). Its oscillator supports 200kHz–2.2MHz via RT resistor, and frequency foldback activates during startup or overload to limit inductor current.
Burst Mode operation shuts down all switching circuitry between pulses, reducing VIN current to 2.5µA at no load while maintaining ±9% PG flag accuracy. The device uses internal 14.3MΩ feedback divider for 3.3V output and supports external tracking/soft-start via TR/SS pin with 2.2µA pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range automotive battery and industrial DC bus inputs without pre-regulation. |
| Output Voltage | Fixed 3.3V ±0.6% - internally trimmed; eliminates external resistor network and reduces BOM count. |
| Max Output Current | 3.5A - enables single-chip power for microcontrollers, sensors, and communication ICs in space-constrained designs. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - extends 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 switching without pulse skipping. |
| Switching Frequency | 200kHz–2.2MHz - programmable via RT pin; enables EMI optimization and small external component selection. |
| PG Accuracy | ±9% of VOUT - provides reliable power-good signaling for system sequencing and fault detection. |
Pinout & Package
LT8610AIMSE-3.3#PBF uses a thermally enhanced 16-lead MSOP package with exposed GND pad (Pin 17) requiring PCB soldering for thermal performance (θJC = 10°C/W). Pin 7 is NC; Pins 5/6 are paralleled VIN inputs; Pins 9/10/11 are paralleled SW outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Ground for low-ripple Burst Mode; tie to logic high or external clock for pulse-skipping mode. |
| TR/SS (2) | Tracking/Soft-Start control | Capacitor-programmed voltage ramp; internal 2.2µA pull-up enables adjustable startup slew rate. |
| RT (3) | Frequency programming | Resistor-to-GND sets oscillator frequency from 200kHz to 2.2MHz with ±10% tolerance. |
| EN/UV (4) | Enable/Undervoltage lockout | 1.0V rising threshold with 40mV hysteresis; supports VIN brownout protection or remote shutdown. |
| VIN (5,6) | Main power input | Paralleled pins supply internal circuitry and top switch; require local 1µF ceramic bypass near pins. |
| NC (7) | No connect | Not bonded; must remain unconnected on PCB. |
| GND (8) | Power ground return | Return path for bottom switch; must be tied to exposed pad (Pin 17) for thermal and electrical integrity. |
| VOUT (16) | Regulated output | Fixed 3.3V output; connects to internal 14.3MΩ divider - no external feedback required. |
| PG (15) | Power-good flag | Open-drain output active high when VOUT is within ±9% of 3.3V and no fault detected. |
| BIAS (14) | Bias supply input | Tie to VOUT (≥3.3V) to reduce VIN current draw and improve light-load efficiency. |
| INTVCC (13) | Internal 3.4V regulator bypass | Requires ≥1µF ceramic capacitor to GND; powers gate drivers and control logic. |
| BST (12) | Bootstrap supply | Connect 0.1µF ceramic capacitor between BST and SW to drive top NMOS gate above VIN. |
| SW (9,10,11) | Switch node | Paralleled outputs of internal power switches; connect to inductor and BST capacitor with minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications across –40°C to 125°C junction temperature with full reliability testing. |
| Ultralow 2.5µA IQ | Enables >10-year battery life in always-on vehicle modules (e.g., CAN transceivers, tire pressure sensors). |
| 30ns minimum on-time | Supports 42V→3.3V conversion at 2MHz without duty-cycle limitation or forced CCM operation. |
| EMI-optimized Silent Switcher | Integrated split-VIN layout and fast, controlled switching edges reduce radiated emissions by >30dB vs conventional buck. |
| Fixed 3.3V output | Eliminates external feedback resistors and associated noise pickup paths - improves accuracy and simplifies layout. |
| Programmable soft-start | TR/SS pin allows precise control of output ramp rate to prevent inrush current and system reset glitches. |
Applications
| Automotive Telematics Module | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering GPS/GSM modem, MCU, and CAN transceiver in vehicle black box with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 3.3V power rail regulator delivering stable output across extreme automotive voltage transients. Use Value: 2.5µA IQ extends backup battery life during ignition-off; 42V max input eliminates need for front-end protection ICs. | Use Scenario: Supplying ultra-low-power microcontroller, LoRa transceiver, and environmental sensor in battery-operated field gateway. IC Role / Device Role / Timing Role: Main system regulator enabling multi-year operation on primary lithium thionyl chloride cell. Use Value: Fixed 3.3V output ensures consistent MCU timing and ADC reference; 30ns min on-time supports high-frequency switching for compact magnetics. |
| Railway Signaling Interface | Medical Portable Monitor |
Use Scenario: Providing isolated 3.3V supply for RS-485 interface and microcontroller in track-side signaling unit powered from 24VDC rail. IC Role / Device Role / Timing Role: High-reliability DC/DC converter meeting EN 50155 shock/vibration and temperature requirements. Use Value: AEC-Q100 qualification ensures long-term stability in harsh environments; ±9% PG flag enables robust system health monitoring. | Use Scenario: Powering clinical-grade display controller, touch interface, and Bluetooth LE module in handheld patient monitor. IC Role / Device Role / Timing Role: Low-noise, low-ripple 3.3V source for analog front-end and digital subsystems. Use Value: Burst Mode operation minimizes standby power; fixed output eliminates resistor drift errors affecting measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ABIMSE-3.3#PBF | Higher light-load efficiency (91% vs 82% at 1mA), but increased output ripple in Burst Mode due to 1A burst current vs 400mA. | Preferred where lowest possible power consumption dominates over ripple sensitivity (e.g., energy-harvesting nodes). | Select LT8610ABIMSE-3.3#PBF only if system can tolerate higher ripple or includes additional output capacitance. |
| LMQ66430QRNXTQ1 | 42V, 3A, 15µA IQ, fixed 3.3V, but lacks SYNC, TR/SS, and PG; uses different pinout and package (16-pin QFN). | Suitable for cost-sensitive automotive applications where soft-start control and power-good signaling are not required. | Choose LMQ66430QRNXTQ1 for simplified design where feature set reduction is acceptable and footprint compatibility is verified. |
Compared with LT8610ABIMSE-3.3#PBF, the LT8610AIMSE-3.3#PBF offers lower output ripple and simpler EMI filtering, while the LMQ66430QRNXTQ1 trades away critical system-level features (PG, tracking, sync) for lower cost and smaller solution size - making LT8610AIMSE-3.3#PBF optimal for precision, feature-rich automotive and industrial power rails.
Availability
LT8610AIMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial IoT sensor nodes, railway signaling interfaces, and medical portable monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8610AIMSE-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 industrial, automotive, communications, and healthcare markets.
The LT8610A series was designed specifically for automotive and industrial applications demanding ultralow quiescent current, wide input range, and AEC-Q100 reliability - targeting power rails for always-on ECUs, sensors, and connectivity modules.
FAQ
What is the guaranteed operating temperature range for LT8610AIMSE-3.3#PBF?
The LT8610AIMSE-3.3#PBF is guaranteed to operate across –40°C to +125°C junction temperature, with full electrical specifications assured over this range per Analog Devices' characterization and statistical process controls. This makes it suitable for under-hood automotive applications and industrial environments with wide ambient swings.
Does LT8610AIMSE-3.3#PBF require external feedback resistors?
No. The LT8610AIMSE-3.3#PBF integrates a precision 14.3MΩ internal feedback divider to regulate its fixed 3.3V output, eliminating the need for external resistors. This improves accuracy, reduces board space, and avoids resistor drift and noise coupling that affect regulation stability.
How does the BIAS pin improve efficiency in LT8610AIMSE-3.3#PBF?
The BIAS pin on LT8610AIMSE-3.3#PBF allows the internal 3.4V regulator to draw current from VOUT (≥3.3V) instead of VIN, reducing input supply current and improving light-load efficiency. When tied to the 3.3V output, it lowers overall power dissipation and enhances thermal performance in high-input-voltage applications.
Can LT8610AIMSE-3.3#PBF synchronize to an external clock?
Yes. The SYNC pin (Pin 1) of LT8610AIMSE-3.3#PBF accepts an external clock signal (0.2–2.2MHz) to align switching edges, enabling deterministic EMI reduction and synchronization with other system clocks. When grounded, it enables low-ripple Burst Mode; when pulled high, it enters pulse-skipping mode.
What is the purpose of the exposed pad (Pin 17) on LT8610AIMSE-3.3#PBF?
The exposed pad (Pin 17) on LT8610AIMSE-3.3#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve θJC = 10°C/W and ensure safe thermal dissipation at 3.5A continuous load. Failure to solder this pad risks thermal shutdown and reduced reliability.
LT8610AIMSE-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610AIMSE-3.3#PBF FAQ
1.How can I place an order for LT8610AIMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610AIMSE-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 LT8610AIMSE-3.3#PBF reliable?
The price and inventory of LT8610AIMSE-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 LT8610AIMSE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8610AIMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610AIMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610AIMSE-3.3#PBF?
LT8610AIMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610AIMSE-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 LT8610AIMSE-3.3#PBF?
For technical support, including LT8610AIMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610AIMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT8610AIMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610AIMSE-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 LT8610AIMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8610AIMSE-3.3#PBF?
All LT8610AIMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610AIMSE-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 LT8610AIMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8610AIMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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