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Analog Devices Inc. LT8610ACHMSE#PBF
- Part No.:
- LT8610ACHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ACHMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:716
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Product details
Overview
LT8610ACHMSE#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 0.80V feedback reference, 30ns minimum on-time, and AEC-Q100 qualification for automotive applications. It operates from 3V to 42V input, delivers regulated output down to 0.8V, and supports synchronization and soft-start via dedicated pins.
For engineers reviewing the LT8610ACHMSE#PBF datasheet, LT8610ACHMSE#PBF pinout, LT8610ACHMSE#PBF application, or LT8610ACHMSE#PBF equivalent, key selection considerations include its ultralow IQ at light load, high-frequency capability (up to 2.2MHz), thermal robustness (–40°C to 150°C junction), and integrated PG flag for power-good monitoring.
Technical Context
The LT8610ACHMSE#PBF implements constant-frequency current-mode control with internal 0.80V reference and programmable switching frequency (200kHz–2.2MHz via RT resistor). Its architecture includes synchronous MOSFETs, integrated slope compensation, and Burst Mode operation that reduces IQ to 2.5µA while maintaining regulation.
It features dual supply paths-INTVCC powered from VIN or BIAS (≥3.1V)-enabling higher efficiency when biased from VOUT ≥3.3V. The device integrates overtemperature protection, input UVLO, and fault detection via open-drain PG pin signaling ±8% output deviation or fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial rails without external pre-regulation |
| Quiescent Current | 2.5µA at no load, 12VIN→3.3VOUT - enables always-on systems with multi-year battery life |
| Feedback Reference | 0.800V ±6mV - allows precise low-output-voltage regulation with minimal divider current |
| Max Output Current | 3.5A continuous - sustains full load under worst-case thermal conditions in MSOP package |
| Min On-Time | 30ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz switching without pulse skipping |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; supports EMI optimization and compact magnetics |
| Operating Temp | –40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive use |
Pinout & Package
LT8610ACHMSE#PBF uses a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB for thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Enables synchronization to external clock or selects Burst Mode (grounded) vs pulse-skipping (high) |
| TR/SS (2) | Tracking/Soft-Start control | Programs output ramp rate via capacitor; enables voltage tracking during startup or sequencing |
| RT (3) | Frequency set resistor | Resistor to GND sets oscillator frequency (200kHz–2.2MHz); determines inductor size and EMI profile |
| EN/UV (4) | Enable / input undervoltage lockout | Hysteretic enable threshold (1.015V rise, 0.97V fall) allows programmable VIN brownout detection |
| VIN (5,6) | Main input power supply | Supplies top switch and internal circuitry; requires local high-frequency bypassing near pins |
| NC (7) | No connect | Internally unconnected; must remain floating or grounded per layout best practice |
| GND (8) | Power ground return | Return path for bottom switch and control circuitry; tied to exposed pad (Pin 17) for thermal conduction |
| SW (9,10,11) | Switch node | Drives external inductor; high di/dt node requiring minimized loop area and tight layout |
| BST (12) | Bootstrap supply | Charges 0.1µF capacitor to drive high-side NMOS gate above VIN; critical for efficient top-switch operation |
| INTVCC (13) | Internal 3.4V regulator output | Bypassed with ≥1µF ceramic; powers internal logic; sourced from BIAS if >3.1V, else from VIN |
| 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 low when VOUT deviates >±8% from target or fault occurs; valid above 3.0V VIN |
| FB (16) | Feedback input | Regulated to 0.800V; connects to resistor divider tap; requires 4.7–10pF phase-lead capacitor for stability |
| GND (17) | Exposed thermal pad | Electrically and thermally connected to internal GND; mandatory soldering to PCB plane for thermal reliability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation up to +150°C junction temperature |
| Ultralow 2.5µA quiescent current | Enables >10-year battery life in always-on telematics, ADAS sensors, and infotainment standby modes |
| 30ns minimum on-time | Supports direct 42V-to-3.3V conversion at 2MHz, eliminating intermediate stages and reducing BOM count |
| Synchronized Burst Mode operation | Maintains low EMI and tight output regulation while achieving sub-3µA no-load IQ |
| Integrated PG flag with ±8% accuracy | Provides system-level power sequencing and fault reporting without external comparators |
| BIAS pin efficiency enhancement | Reduces total input current by sourcing INTVCC from VOUT ≥3.3V, improving full-load efficiency by ~0.5% |
Applications
| Automotive Infotainment Power | GSM Base Station RF Power |
|---|---|
Use Scenario: Powering SoC cores and DDR memory in head-unit systems requiring low-noise, always-on 1.2V/3.3V rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 3.5A at 1.2V with 2.5µA IQ for low-power sleep states. Use Value: Enables 15-year battery-backed RTC and CAN wake-up functionality without compromising runtime. | Use Scenario: Generating stable 5V/3.3V supplies for RF front-end ICs in 4G/5G macro base stations exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability DC/DC converter operating continuously at –40°C to +85°C ambient with 42V input surge tolerance. Use Value: Eliminates need for external TVS and pre-regulators due to 42V absolute max rating and integrated fault protection. |
| Industrial PLC I/O Module | Medical Portable Diagnostic Device |
Use Scenario: Providing isolated 5V and 3.3V rails for digital I/O, ADCs, and communication interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Main point-of-load regulator handling 3.5A peak loads during fieldbus burst transmission. Use Value: Maintains regulation during 24V rail dips to 3V (brownout), with soft-start recovery preventing output overshoot. | Use Scenario: Supplying FPGA, display, and sensor subsystems in handheld ultrasound and glucose monitors with single-cell Li-ion input. IC Role / Device Role / Timing Role: Efficient step-down converter operating from 3.0V–4.2V battery range with ultra-low standby IQ. Use Value: Extends single-charge battery life to >72 hours in active diagnostic mode and >30 days in standby. |
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 |
|---|---|---|---|
| LT8610ACEMSE#PBF | Same silicon, –40°C to +125°C junction rating; lower thermal grade; no AEC-Q100 qualification | Suitable for commercial/industrial environments without automotive temperature or reliability requirements | Select when cost sensitivity outweighs automotive qualification and extended temperature needs |
| LT8610ACHMSE-1#PBF | Optimized internal compensation for 1.5–2.2MHz operation; added TR/SS discharge circuit for dropout recovery | Better transient response and reduced overshoot in high-frequency (>1.5MHz) designs with fast load steps | Select for 2MHz+ applications where output stability during brownout exit is critical |
Compared with LT8610ACEMSE#PBF, the LT8610ACHMSE#PBF offers guaranteed operation to +150°C and AEC-Q100 compliance for automotive use; compared with LT8610ACHMSE-1#PBF, it provides broader frequency range (200kHz–2.2MHz) at the expense of slightly slower transient recovery from dropout.
Availability
LT8610ACHMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, and medical portable diagnostics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8610ACHMSE#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 precision instrumentation, communications, and automotive markets.
The LT8610AC family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, thermally demanding applications-including automotive, industrial, and portable electronics-where reliability across extreme temperatures is essential.
FAQ
What is the maximum junction temperature specification for the LT8610ACHMSE#PBF?
The LT8610ACHMSE#PBF is specified for continuous operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade H. This rating is validated through process characterization and thermal testing, enabling use in under-hood automotive applications where ambient temperatures exceed 125°C.
How does the BIAS pin improve efficiency in the LT8610ACHMSE#PBF?
The BIAS pin on the LT8610ACHMSE#PBF allows the internal 3.4V regulator (INTVCC) to draw current from VOUT instead of VIN when VBIAS ≥3.1V. When the LT8610ACHMSE#PBF regulates to 3.3V or higher, connecting BIAS to VOUT reduces total input current and improves full-load efficiency by approximately 0.5%, especially beneficial in battery-powered systems.
Can the LT8610ACHMSE#PBF operate with an input voltage below 3.0V?
No-the LT8610ACHMSE#PBF has a minimum input voltage of 3.0V (typical 2.6V absolute min) and will not regulate below this threshold. Attempting operation below 3.0V causes the device to enter undervoltage lockout, disabling switching and asserting PG low. For sub-3V inputs, consider the LT8613 or LT3643 families.
What is the purpose of the TR/SS pin in the LT8610ACHMSE#PBF?
The TR/SS pin on the LT8610ACHMSE#PBF serves dual functions: soft-start control (via external capacitor) and output voltage tracking. During startup, a capacitor on TR/SS programs the output slew rate; during sequencing, tying TR/SS to another rail enables coordinated power-up. In LT8610ACHMSE#PBF, this pin also supports fault discharge to prevent overshoot during dropout recovery.
Does the LT8610ACHMSE#PBF require external compensation components?
No-the LT8610ACHMSE#PBF features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. Its fixed compensation is optimized for stability with standard output capacitor ESR and typical inductor values, simplifying design and reducing bill-of-materials count.
LT8610ACHMSE#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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 42V
- 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
LT8610ACHMSE#PBF FAQ
1.How can I place an order for LT8610ACHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ACHMSE#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 LT8610ACHMSE#PBF reliable?
The price and inventory of LT8610ACHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610ACHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ACHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ACHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ACHMSE#PBF?
LT8610ACHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ACHMSE#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 LT8610ACHMSE#PBF?
For technical support, including LT8610ACHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ACHMSE#PBF requirements.
6.How does Aetrix verify that LT8610ACHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ACHMSE#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 LT8610ACHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ACHMSE#PBF?
All LT8610ACHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ACHMSE#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 LT8610ACHMSE#PBF part is unused and in its original packaging.
Return procedure for LT8610ACHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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