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Analog Devices Inc. LT8610ABIMSE#PBF
- Part No.:
- LT8610ABIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ABIMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,382
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Product details
Overview
LT8610ABIMSE#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 fixed 5V output. It features integrated power switches, internal feedback divider (12.5MΩ), and AEC-Q100 qualification for automotive power supplies requiring ultra-low IQ and high input voltage tolerance.
For engineers reviewing the LT8610ABIMSE#PBF datasheet, LT8610ABIMSE#PBF pinout, LT8610ABIMSE#PBF application, or LT8610ABIMSE#PBF equivalent, this page delivers verified technical context, package-validated pin functions, real-world efficiency curves at 5V/3.3V, EMI-optimized switching behavior, and automotive-grade thermal performance up to 125°C junction temperature.
Technical Context
The LT8610ABIMSE#PBF implements constant-frequency current-mode control with RT-programmable switching frequency (200kHz–2.2MHz) and frequency foldback during startup or overload. Its dual NMOS power stage includes 120mΩ top switch and 65mΩ bottom switch, with 6.7A top current limit and 4.3A bottom current limit under full specification.
Burst Mode operation enables ultralow 2.5µA input current at no load while maintaining ±9% output regulation accuracy via PG flag monitoring. The BIAS pin allows sourcing of internal circuitry from VOUT (≥3.3V), reducing VIN supply current and improving light-load efficiency over the LT8610A variant.
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 (40V+) |
| Output Voltage | Fixed 5.00V ±1% - internally trimmed with 12.5MΩ feedback divider; eliminates external resistor network |
| Max Output Current | 3.5A continuous - sustained at full junction temperature (125°C) with proper PCB thermal design |
| Quiescent Current | 2.5µA at 12VIN/5VOUT, no load - enables always-on systems with multi-year battery life |
| Min On-Time | 30ns - enables high step-down ratios (e.g., 42V→5V @ 2MHz) without pulse-skipping instability |
| Efficiency @ 1A | 95% at 12VIN/5VOUT - achieved via synchronous rectification and low RDS(on) power switches |
| Package | 16-lead MSOP with exposed pad - θJA = 40°C/W; requires soldered GND pad for thermal and EMI performance |
Pinout & Package
LT8610ABIMSE#PBF uses a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed GND pad (Pin 17). The package measures 4.0mm × 5.0mm × 1.1mm and requires mandatory soldering of the exposed pad to PCB ground plane for thermal dissipation (θJC(PAD) = 10°C/W) and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Ground for low-ripple Burst Mode; tie to logic high or external clock for pulse-skipping mode; floating prohibited |
| TR/SS (2) | Soft-start and tracking control | Capacitor-programmed voltage ramp; internal 2.2µA pull-up enables controlled VOUT rise time; pulled low during fault |
| RT (3) | Switching frequency programming | Resistor-to-GND sets fSW from 200kHz to 2.2MHz; disables frequency foldback when SYNC is high |
| EN/UV (4) | Enable and input undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; enables shutdown below VIN = 3.4V or user-defined UVLO via resistor divider |
| VIN (5,6) | Main input power supply | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR ceramic capacitor near pins |
| NC (7) | No connect | Not bonded; leave unconnected; no internal connection |
| GND (8) | Power and signal ground return | Return path for bottom switch and analog circuits; must be tied to exposed pad (Pin 17) |
| SW (9,10,11) | Switch node | Drives external inductor and BST capacitor; low-inductance layout critical for EMI and efficiency |
| BST (12) | Bootstrap supply for top gate driver | Requires 0.1µF ceramic capacitor between BST and SW; enables high-side NMOS drive above VIN |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers internal logic; sourced from BIAS if VBIAS > 3.1V, else from VIN |
| BIAS (14) | Internal regulator auxiliary supply | Tie to VOUT (≥3.3V) to reduce VIN current and improve light-load efficiency; bypass with 1µF if externally driven |
| PG (15) | Power good open-drain flag | Asserts high when VOUT is within ±9% of target and no fault; valid only when VIN > 3.4V |
| VOUT (16) | Regulated 5V output | Fixed 5.00V output with internal 12.5MΩ divider; connects directly to load; no external feedback required |
| GND (17) | Exposed thermal pad | Mandatory solder connection to PCB GND plane; primary thermal path and EMI return path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications across –40°C to +125°C junction temperature with production traceability |
| Ultralow 2.5µA IQ | Enables >10-year battery life in always-on telematics modules; measured at 12VIN/5VOUT, no load |
| 30ns minimum on-time | Supports 42V→5V conversion at 2MHz without duty-cycle limitation or forced PWM operation |
| Integrated 12.5MΩ feedback | Eliminates external resistors, reduces BOM count, and minimizes quiescent current contribution from feedback network |
| BIAS pin optimization | Reduces VIN supply current by >50% at light loads when BIAS tied to VOUT, improving system-level efficiency |
| Robust fault protection | Includes overtemperature shutdown, cycle-by-cycle current limiting, and PG-based output monitoring |
Applications
| Automotive Infotainment Power | GSM/4G LTE Modem Supply |
|---|---|
|
Use Scenario: Powering display controllers, audio codecs, and USB hubs in head units with cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3.5A with fast transient response and low EMI for noise-sensitive RF sections. Use Value: AEC-Q100 qualification ensures reliability; 2.5µA IQ extends battery backup time during ignition-off; 30ns on-time maintains regulation during 42V transients. |
Use Scenario: Providing stable 5V rail to cellular modems in fleet tracking devices operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling >93% efficiency at 1A/5V from 12V vehicle bus. Use Value: Fixed 5V output eliminates calibration drift; BIAS pin reduces heat generation in sealed enclosures; PG flag enables modem reset sequencing. |
| Industrial IoT Sensor Hub | Point-of-Sale Terminal Power |
|
Use Scenario: Powering ARM Cortex-M microcontrollers, BLE radios, and environmental sensors in battery-backed edge nodes. IC Role / Device Role / Timing Role: Always-on 5V supply with ultralow IQ preserving coin-cell or supercapacitor energy for months between wake-ups. Use Value: 2.5µA quiescent current enables >3-year battery life; 42V input withstands industrial 24VDC surges; MSOP package fits compact PCBs. |
Use Scenario: Generating 5V for payment processors, touchscreens, and thermal printers in retail terminals powered from 12–24V AC/DC adapters. IC Role / Device Role / Timing Role: Main DC-DC converter delivering clean, regulated 5V with soft-start to prevent inrush current tripping upstream supplies. Use Value: TR/SS pin enables programmable startup ramp to avoid brown-out on shared rails; PG flag confirms stable power before firmware boot. |
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 |
|---|---|---|---|
| LT8610AEMSE-5#PBF | Same 5V fixed output, 3.5A rating, and MSOP package but lower light-load efficiency (82% vs 91% at 1mA) and higher Burst Mode ripple | Lacks LT8610AB's improved light-load efficiency; suitable where lowest possible IQ is secondary to ripple sensitivity | Select LT8610AEMSE-5#PBF when output voltage ripple must be minimized at very light loads (<10mA), accepting higher IQ |
| LM61480RQWR | 42V, 8A regulator with 15µA IQ, 45ns min on-time, and adjustable output; larger 16-pin WQFN package (3mm × 4.5mm) | Higher current capability and adjustable VOUT; lacks AEC-Q100 qualification and fixed 5V option | Choose LM61480RQWR when >3.5A output or programmable voltage is required, and automotive qualification is not mandatory |
Compared with LT8610AEMSE-5#PBF, the LT8610ABIMSE#PBF delivers 9% higher efficiency at 1mA load and lower IQ, making it superior for battery-critical automotive and IoT applications; versus LM61480RQWR, it offers AEC-Q100 compliance and smaller solution size at the cost of fixed output and lower max current.
Availability
LT8610ABIMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial IoT sensor nodes, and point-of-sale terminal power supplies requiring stable component supply, AEC-Q100 qualification, and ultralow quiescent current performance.
Supply support for LT8610ABIMSE#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 LT8610ABIMSE#PBF belongs to the LT8610A/LT8610AB monolithic synchronous buck regulator product line, designed specifically for automotive and industrial applications demanding ultralow IQ, high input voltage tolerance, and robust thermal performance.
FAQ
What is the guaranteed operating junction temperature range for LT8610ABIMSE#PBF?
The LT8610ABIMSE#PBF is guaranteed over the full –40°C to +125°C junction temperature range per its "I" grade designation. This is confirmed in the Order Information table and Absolute Maximum Ratings section, where LT8610ABIMSE#PBF is explicitly listed with –40°C to 125°C temperature range and AEC-Q100 qualification for automotive use.
Does LT8610ABIMSE#PBF require external feedback resistors to set the 5V output?
No, the LT8610ABIMSE#PBF does not require external feedback resistors. It integrates a precise 12.5MΩ internal feedback divider optimized for 5.00V ±1% output, as specified in the Electrical Characteristics table. This eliminates external components, reduces BOM cost, and minimizes quiescent current contribution from the feedback network.
How does the BIAS pin improve efficiency in LT8610ABIMSE#PBF?
The BIAS pin on the LT8610ABIMSE#PBF allows the internal 3.4V regulator to draw current from VOUT (≥3.3V) instead of VIN, reducing input supply current and associated conduction losses. When BIAS is tied to the 5V output, light-load efficiency improves significantly-verified in the Typical Performance Characteristics showing >91% efficiency at 1mA load.
What is the purpose of the exposed pad (Pin 17) on LT8610ABIMSE#PBF?
The exposed pad (Pin 17) on the LT8610ABIMSE#PBF is a mandatory GND connection that serves as the primary thermal dissipation path (θJC(PAD) = 10°C/W) and EMI return path. Per the Pin Configuration diagram and Package Description, it must be soldered to the PCB ground plane; failure to do so risks thermal shutdown and increased radiated emissions.
Can LT8610ABIMSE#PBF synchronize to an external clock, and how is it configured?
Yes, the LT8610ABIMSE#PBF can synchronize to an external clock via the SYNC pin (Pin 1). To enable synchronization, apply a logic-compatible clock signal (0.8V–2.4V thresholds) to SYNC; the device will align positive SW transitions to the external clock edges and disable frequency foldback. Grounding SYNC enables low-ripple Burst Mode operation.
LT8610ABIMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610ABIMSE#PBF FAQ
1.How can I place an order for LT8610ABIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ABIMSE#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 LT8610ABIMSE#PBF reliable?
The price and inventory of LT8610ABIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610ABIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ABIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ABIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ABIMSE#PBF?
LT8610ABIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ABIMSE#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 LT8610ABIMSE#PBF?
For technical support, including LT8610ABIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ABIMSE#PBF requirements.
6.How does Aetrix verify that LT8610ABIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ABIMSE#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 LT8610ABIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ABIMSE#PBF?
All LT8610ABIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ABIMSE#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 LT8610ABIMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610ABIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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