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Analog Devices Inc. LT8610HMSE#PBF
- Part No.:
- LT8610HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:204
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Product details
Overview
LT8610HMSE#PBF from Analog Devices (formerly Linear Technology) is a 42V input, 2.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 50ns minimum on-time, and internal compensation for fast transient response. It operates across –40°C to +150°C junction temperature and delivers regulated 3.3V/5V outputs in automotive power supplies and industrial sensors.
For engineers reviewing the LT8610HMSE#PBF datasheet, LT8610HMSE#PBF pinout, LT8610HMSE#PBF application, or LT8610HMSE#PBF equivalent, key selection criteria include ultralow IQ regulation at 12VIN→3.3VOUT, ±9% PG flag accuracy, 700kHz typical switching frequency with RT-programmability, and thermal robustness up to 150°C junction.
Technical Context
The LT8610HMSE#PBF implements peak-current-mode control with internal 0.97V reference and slope compensation, enabling stable operation with small inductors and fast load-step response. Its architecture integrates top and bottom NMOS power switches (120mΩ/65mΩ RDS(ON)) and supports both Burst Mode (2.5µA IQ) and pulse-skipping modes via SYNC pin configuration.
Thermal design is enabled by the exposed-pad 16-lead MSOP package (θJC(PAD) = 10°C/W), while protection features include overtemperature shutdown, EN/UV hysteresis (40mV), and PG fault signaling with ±9% VFB threshold offset. The BIAS pin allows efficiency optimization by sourcing INTVCC current from VOUT ≥3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range automotive and industrial rails without external pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows trade-off between EMI filtering size and efficiency. |
| Min On-Time / Off-Time | 50ns / 80ns - enables high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse skipping. |
| Output Accuracy | ±1% FB reference (0.970V typ) - ensures tight output regulation across temperature and line/load. |
| Thermal Rating | –40°C to +150°C junction - qualified for under-hood automotive and high-temp industrial environments. |
| PG Flag Threshold | ±9% of VFB - provides precise power-good assertion for downstream logic sequencing. |
Pinout & Package
LT8610HMSE#PBF uses a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), θJA = 40°C/W, θJC(PAD) = 10°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Ground for Burst Mode (2.5µA IQ); tie to INTVCC or logic high for pulse-skipping mode. |
| TR/SS (2) | Soft-start and tracking control | Capacitor-programmed voltage ramp rate; internal 2.2µA pull-up enables adjustable start-up slew. |
| RT (3) | Frequency programming resistor | Resistor to GND sets fSW from 200kHz–2.2MHz; e.g., 60.4kΩ → 700kHz. |
| EN/UV (4) | Enable and input UVLO control | 1.00V rising threshold with 40mV hysteresis; supports programmable VIN undervoltage lockout. |
| VIN (5,6) | Main input power supply | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass near pins. |
| PGND (7,8) | Power switch ground return | Low-inductance return path for bottom switch; must connect directly to input capacitor negative. |
| SW (9–11) | Switch node output | Connects to inductor and BST capacitor; keep trace short and low-area for EMI reduction. |
| BST (12) | Bootstrap drive voltage | Requires 0.1µF ceramic capacitor to SW for top NMOS gate drive above VIN. |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies control circuitry; draws from BIAS if VBIAS > 3.1V. |
| BIAS (14) | Efficiency-optimized bias supply | Tie to VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency. |
| PG (15) | Open-drain power-good flag | Pulls low when VFB deviates >±9% or fault occurs; valid above 3.4V VIN regardless of EN state. |
| FB (16) | Feedback voltage sense | Regulated to 0.970V; connect resistor divider tap here; add 4.7–10pF phase-lead cap to VOUT. |
| GND (17) | Exposed thermal pad | Must be soldered to PCB ground plane; primary thermal path and signal reference. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load enables multi-year battery operation in IoT edge nodes. |
| Integrated Power Switches | 120mΩ top / 65mΩ bottom NMOS eliminate external FETs and gate drivers, reducing BOM count. |
| Programmable Switching Frequency | 200kHz–2.2MHz via single RT resistor enables EMI compliance and inductor size optimization. |
| Robust Thermal Performance | 150°C max junction rating with exposed-pad MSOP supports under-hood automotive deployment. |
| Accurate Power-Good Signaling | ±9% PG threshold with hysteresis ensures reliable system power sequencing and fault detection. |
| BIAS Pin Efficiency Boost | Switching INTVCC supply from BIAS ≥3.3V reduces VIN current and improves light-load efficiency. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powering 3.3V microcontrollers and CAN transceivers in vehicle head units with cold-crank (4.5V) to load-dump (42V) input transients. IC Role / Device Role / Timing Role: Primary 42V-input buck regulator delivering regulated 3.3V with <2.5µA quiescent current during sleep mode. Use Value: Maintains system readiness during 16-hour ignition-off periods without draining 12V battery below cranking threshold. |
Use Scenario: Providing stable 5V rail for wireless sensor modules deployed in factory-floor machinery with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter operating continuously at 1A load with minimal thermal rise. Use Value: Enables fanless enclosure design due to 150°C junction rating and low thermal resistance (θJC = 10°C/W). |
| GSM Base Station RF Power Amp Bias | Medical Portable Diagnostic Device |
|
Use Scenario: Generating clean 5V supply for GaAs RF power amplifiers requiring low-noise, ripple-controlled operation in cellular infrastructure. IC Role / Device Role / Timing Role: Low-EMI buck regulator with 700kHz fixed frequency and <10mVP-P output ripple in Burst Mode. Use Value: Eliminates need for post-regulator LDOs by meeting GSM spectral mask requirements without additional filtering. |
Use Scenario: Powering precision ADCs and low-power ARM Cortex-M4 processors in handheld ultrasound probes with Li-ion battery input (3.0–4.2V). IC Role / Device Role / Timing Role: Wide-input buck converter supporting direct battery-to-3.3V conversion with soft-start and tracking for analog front-end sequencing. Use Value: TR/SS pin enables synchronized voltage ramp with analog sensor biasing, preventing startup glitches in sensitive measurement paths. |
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 |
|---|---|---|---|
| LT8614HMSE#PBF | Quad-channel version with independent enable and sync; same 42V/2.5A per channel, but larger 24-lead MSOP package. | Required for multi-rail systems needing isolated sequencing (e.g., FPGA core/I/O banks); not suitable for space-constrained single-output designs. | Select LT8614HMSE#PBF only when multiple tightly regulated rails with independent control are needed; LT8610HMSE#PBF remains optimal for cost- and size-sensitive single-output use cases. |
| MPQ4420AGL-AEC1-Z | Automotive-grade 42V/2A buck with 17µA IQ; lacks BIAS pin, PG flag, and 50ns min on-time - limited to lower VIN/VOUT ratios. | Suitable for non-safety-critical 12V systems where 2A output suffices and extended temperature range is not required. | Choose MPQ4420AGL-AEC1-Z for AEC-Q200-compliant 12V applications with relaxed IQ and thermal specs; LT8610HMSE#PBF is preferred for 150°C operation and ultralow-IQ battery backup. |
Compared with LT8614HMSE#PBF and MPQ4420AGL-AEC1-Z, the LT8610HMSE#PBF uniquely balances 2.5µA IQ, 150°C operation, and 50ns min on-time in a compact 16-lead MSOP - making it the only option for space-constrained, high-temp, battery-backed 42V buck applications.
Availability
LT8610HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8610HMSE#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 maintains full product support, documentation, and manufacturing continuity for the LT® series of high-performance power management ICs.
The LT8610HMSE#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for automotive, industrial, and battery-powered systems demanding ultralow quiescent current and robust thermal performance.
FAQ
What is the maximum junction temperature rating for the LT8610HMSE#PBF?
The LT8610HMSE#PBF is rated for continuous operation up to +150°C junction temperature, verified across the full –40°C to +150°C operating range. This H-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where standard E- or I-grade variants (125°C max) would fail prematurely.
How does the BIAS pin improve efficiency in the LT8610HMSE#PBF?
The BIAS pin on the LT8610HMSE#PBF allows the internal 3.4V regulator (INTVCC) to draw current from VOUT instead of VIN when VBIAS ≥ 3.1V. For 3.3V/5V outputs, tying BIAS to VOUT reduces input supply current and improves light-load efficiency - a key advantage over regulators without this feature. This function is fully supported in the LT8610HMSE#PBF datasheet Section 8.
Can the LT8610HMSE#PBF operate with a 3.0V input voltage?
No - the LT8610HMSE#PBF has a minimum input voltage of 3.4V as specified in Absolute Maximum Ratings and Electrical Characteristics tables. Attempting operation below 3.4V will result in dropout or failure to regulate. For sub-3.4V inputs, consider alternative regulators such as the LT8609S (2.8V min VIN) or redesign the front-end supply.
What is the purpose of the TR/SS pin on the LT8610HMSE#PBF?
The TR/SS (Track/Soft-Start) pin on the LT8610HMSE#PBF controls output voltage ramp rate during startup and enables output voltage tracking. A capacitor on this pin sets soft-start time; connecting it to another voltage rail enables coordinated power sequencing. Internal 2.2µA pull-up current and 230Ω pulldown during fault ensure predictable behavior - critical for systems with analog sensors or FPGAs requiring controlled power-up.
Does the LT8610HMSE#PBF require an external compensation network?
No - the LT8610HMSE#PBF features internal compensation optimized for peak-current-mode control, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces component count, and ensures stable operation with small inductors across the full 200kHz–2.2MHz frequency range set by the RT resistor.
LT8610HMSE#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):
- 40V
- Current - Output:
- 2.5A
- 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
LT8610HMSE#PBF FAQ
1.How can I place an order for LT8610HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610HMSE#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 LT8610HMSE#PBF reliable?
The price and inventory of LT8610HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610HMSE#PBF?
LT8610HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610HMSE#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 LT8610HMSE#PBF?
For technical support, including LT8610HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610HMSE#PBF requirements.
6.How does Aetrix verify that LT8610HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610HMSE#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 LT8610HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610HMSE#PBF?
All LT8610HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610HMSE#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 LT8610HMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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