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Analog Devices Inc. LT8610AXMSE#PBF
- Part No.:
- LT8610AXMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610AXMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
LT8610AXMSE#PBF from Analog Devices (formerly Linear Technology) is a 42V, 3.5A synchronous step-down regulator rated for continuous operation at 175°C junction temperature, featuring ±2% reference accuracy over –40°C to 175°C, 200kHz–2.2MHz adjustable switching frequency, and internal compensation for fast transient response. It serves as a high-reliability power supply controller in downhole oil/gas electronics.
For engineers reviewing the LT8610AXMSE#PBF datasheet, LT8610AXMSE#PBF pinout, LT8610AXMSE#PBF application, or LT8610AXMSE#PBF equivalent, key selection criteria include 175°C operational rating, no thermal shutdown behavior, ultralow quiescent current Burst Mode® operation, and MSOP-16 exposed-pad thermal performance.
Technical Context
The LT8610AXMSE#PBF implements peak current mode control with internal compensation, enabling stable loop dynamics using small external inductors. Its 0.970V feedback reference is trimmed to ±2% across –40°C to 175°C, and the EN/UV pin provides a precise 1.00V rising threshold for programmable input undervoltage lockout.
Burst Mode® operation delivers ultralow no-load input current (26μA typical at 6VIN, 100μA load) while maintaining low output ripple; synchronization via the SYNC pin supports noise-sensitive systems, and the PG flag asserts when VOUT reaches ±9% of regulation with fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 42V - supports wide industrial and downhole supply rails without pre-regulation |
| Output Current | 3.5A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in harsh environments |
| Junction Temp Range | –40°C to 175°C - fully tested and guaranteed at 175°C; no thermal shutdown circuitry |
| Reference Accuracy | ±2% over full temp range - ensures stable output voltage under extreme thermal cycling |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; 700kHz typical with 60.4kΩ sets optimal EMI/efficiency trade-off |
| Quiescent Current | 26μA at 6VIN, 100μA load - enables long-term battery-backed operation in remote monitoring systems |
| Efficiency @ 175°C | 91% at 0.5A, 3.3VOUT/12VIN - maintains high conversion efficiency even at maximum rated temperature |
Pinout & Package
LT8610AXMSE#PBF is housed in a thermally enhanced 16-lead MSOP package (MSE) with an exposed pad (Pin 17) that must be soldered to PCB ground for optimal thermal resistance (θJC(PAD) = 10°C/W). The package supports high-power density designs in space-constrained downhole modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Enables EMI reduction by synchronizing switching to system clock; floating prohibited |
| TR/SS (2) | Soft-start and tracking control | Capacitor-programmable VOUT ramp rate; also enables output voltage tracking during startup |
| RT (3) | Frequency setting resistor node | Connects to GND via resistor to set fSW from 200kHz to 2.2MHz; determines inductor size and efficiency |
| EN/UV (4) | Enable and input UVLO control | Hysteretic 1.00V/0.96V threshold allows precise VIN brownout protection or remote enable |
| VIN (5,6) | Main input power supply | Dual pins reduce IR drop and improve thermal path; require local high-frequency bypassing |
| NC (7) | No connect | Internally unconnected; must remain unconnected on PCB |
| GND (8) | Power and signal ground return | Return path for bottom switch; ties to exposed pad (Pin 17) for lowest θJA |
| SW (9,10,11) | Switch node outputs | High-current connection to inductor and BST capacitor; requires minimal PCB trace area |
| BST (12) | Bootstrap supply for top switch | Requires 0.1μF ceramic capacitor to SW; enables efficient high-side MOSFET drive |
| INTVCC (13) | Internal 3.4V regulator bypass | Must be decoupled with ≥1μF ceramic cap; powers control logic and drivers |
| BIAS (14) | Efficiency-optimized bias supply | When tied to VOUT ≥3.3V, reduces VIN current draw and improves light-load efficiency |
| PG (15) | Power good open-drain flag | Asserts high when VOUT is within ±9% of target and no faults exist; valid above 3.4V VIN |
| FB (16) | Feedback reference input | Regulated to 0.970V; connects to resistor divider tap and phase-lead capacitor (4.7–10pF) |
| GND (17) | Exposed thermal pad | Electrically GND; mandatory solder connection to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| 175°C Junction Rating | 100% production-tested at 175°C - eliminates derating assumptions and enables direct deployment in downhole tools |
| Ultralow IQ Burst Mode® | 26μA no-load input current at 6VIN - extends battery life in unpowered standby modes |
| No Thermal Shutdown | Continuous operation up to 175°C without automatic shutdown - avoids unexpected resets in high-temp environments |
| Internal Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while ensuring stability |
| Adjustable Switching Frequency | 200kHz–2.2MHz via single RT resistor - enables optimization for EMI compliance, efficiency, or component size |
| Power Good Flag with Fault Detection | Open-drain PG signals both regulation status and fault conditions - simplifies system-level health monitoring |
Applications
| Downhole Drilling Tools | High-Temperature Industrial Sensors |
|---|---|
Use Scenario: Power management in measurement-while-drilling (MWD) tools operating continuously at 175°C in oil/gas wellbores. IC Role / Device Role / Timing Role: Primary 3.3V/5V DC-DC converter supplying FPGA, ADCs, and telemetry transceivers. Use Value: Guaranteed 175°C operation eliminates need for external cooling or derating, reducing mechanical complexity and failure risk. | Use Scenario: Local power regulation for pressure/temperature sensors in refinery process control cabinets exposed to ambient >125°C. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24V industrial bus to 3.3V for sensor signal conditioning and digital interface ICs. Use Value: ±2% reference accuracy over full temperature range ensures consistent sensor calibration without software compensation. |
| Aerospace Engine Monitoring | Geothermal Data Acquisition |
Use Scenario: Powering vibration and combustion monitoring electronics mounted directly on turbine casings. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator delivering 5V at 2A to MEMS accelerometers and RF transmitters. Use Value: 92% efficiency at 0.5A and 175°C minimizes self-heating, preserving adjacent component reliability. | Use Scenario: Remote data loggers deployed in geothermal wells where ambient temperatures exceed 150°C for extended periods. IC Role / Device Role / Timing Role: Input-supervised DC-DC controller with EN/UV and PG for autonomous power sequencing and fault reporting. Use Value: Hysteretic EN/UV and PG flag enable robust power-up validation and early fault detection without host processor intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-temperature synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE#PBF | Multi-output (4× configurable channels), lower max temp (150°C), higher quiescent current (2.5μA per channel) | Targeted at distributed low-power rail generation, not single high-current 175°C point-of-load | Select when multiple regulated outputs are required and 175°C operation is not mandatory |
| LM61480RQRR | 175°C rated, but only 3A output, no Burst Mode® (min. 15μA IQ), different pinout and control architecture | Designed for automotive ADAS radar modules; lacks TR/SS and PG features critical for industrial sequencing | Select for automotive-qualified supply where soft-start tracking and power-good signaling are secondary |
Compared with LTC3375EFE#PBF and LM61480RQRR, the LT8610AXMSE#PBF uniquely combines 3.5A output, 175°C guaranteed operation, ultralow IQ Burst Mode®, and integrated PG/soft-start-making it the only choice for mission-critical downhole and industrial high-temp single-rail conversion.
Availability
LT8610AXMSE#PBF is available at Aetrix Electronics and suitable for downhole drilling tools, high-temperature industrial sensors, aerospace engine monitoring systems, and geothermal data acquisition requiring stable component supply across extended temperature lifecycles.
Supply support for LT8610AXMSE#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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog, power management, and precision signal conditioning ICs for demanding applications.
The LT8610AXMSE#PBF belongs to Linear's high-temperature monolithic DC-DC regulator product line, engineered specifically for reliable power conversion in extreme environments such as oil/gas exploration, aerospace propulsion, and geothermal instrumentation.
FAQ
What is the maximum continuous operating junction temperature of the LT8610AXMSE#PBF?
The LT8610AXMSE#PBF is 100% tested and guaranteed for continuous operation at 175°C junction temperature. Unlike standard regulators, it contains no thermal shutdown circuitry, allowing uninterrupted function even at this extreme temperature. This specification is validated across production lots per Linear Technology's test protocol, and the device maintains ±2% reference accuracy and 91% efficiency at 175°C as documented in the official datasheet graphs.
Does the LT8610AXMSE#PBF support output voltage tracking during startup?
Yes, the LT8610AXMSE#PBF supports output voltage tracking via the TR/SS pin (Pin 2). When a voltage below 0.97V is applied to TR/SS, the regulator forces the FB pin to match that voltage, enabling coordinated ramp-up with other supplies. An external capacitor on TR/SS also programs soft-start slew rate. This functionality is confirmed in the Pin Functions section of the LT8610AX datasheet and is electrically distinct from basic soft-start-only controllers.
Can the LT8610AXMSE#PBF be synchronized to an external clock source?
Yes, the LT8610AXMSE#PBF supports external clock synchronization through the SYNC pin (Pin 1). Applying a clean square wave between 200kHz and 2.2MHz to SYNC aligns the internal oscillator phase and frequency, reducing conducted and radiated EMI in noise-sensitive systems. The datasheet specifies that SYNC must not be left floating and recommends tying to INTVCC for pulse-skipping mode if synchronization is unused.
What is the purpose of the BIAS pin on the LT8610AXMSE#PBF, and how should it be connected?
The BIAS pin (Pin 14) on the LT8610AXMSE#PBF improves light-load efficiency by sourcing internal regulator current from VOUT instead of VIN when VBIAS > 3.1V. For 3.3V or 5V outputs, BIAS should be directly connected to VOUT; for lower outputs, it must remain unconnected or tied to a compatible bias rail. A 1μF local bypass capacitor is required if BIAS connects to any supply other than VOUT, as specified in the Pin Functions section.
How does the Power Good (PG) flag on the LT8610AXMSE#PBF behave under fault conditions?
The PG pin (Pin 15) on the LT8610AXMSE#PBF is an open-drain output that remains low until VOUT reaches ±9% of the programmed regulation voltage and no faults (e.g., overcurrent, thermal violation) are present. PG asserts high only when both conditions are met and stays low during startup, shutdown, or fault events. Its validity begins at VIN > 3.4V, independent of EN/UV state, enabling robust system power sequencing and health monitoring in safety-critical applications.
LT8610AXMSE#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):
- 3.7V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 39.7V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610AXMSE#PBF FAQ
1.How can I place an order for LT8610AXMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610AXMSE#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 LT8610AXMSE#PBF reliable?
The price and inventory of LT8610AXMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610AXMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610AXMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610AXMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610AXMSE#PBF?
LT8610AXMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610AXMSE#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 LT8610AXMSE#PBF?
For technical support, including LT8610AXMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610AXMSE#PBF requirements.
6.How does Aetrix verify that LT8610AXMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610AXMSE#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 LT8610AXMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610AXMSE#PBF?
All LT8610AXMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610AXMSE#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 LT8610AXMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610AXMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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