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Analog Devices Inc. LT8610ABHMSE-5#PBF
- Part No.:
- LT8610ABHMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ABHMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:792
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Product details
Overview
LT8610ABHMSE-5#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, fixed 5V output, and 30ns minimum on-time. It features AEC-Q100 qualification for automotive use, integrated 12.5MΩ feedback divider, and operates across –40°C to +150°C junction temperature.
For engineers reviewing the LT8610ABHMSE-5#PBF datasheet, LT8610ABHMSE-5#PBF pinout, LT8610ABHMSE-5#PBF application, or LT8610ABHMSE-5#PBF equivalent, this page delivers verified technical context, package mapping, real-world efficiency curves at 5VOUT, thermal design guidance for MSOP-16EP, and validated automotive-grade alternatives.
Technical Context
The LT8610ABHMSE-5#PBF implements constant-frequency current-mode control with RT-programmable switching frequency (200kHz–2.2MHz) and internal 0.97V reference. Its Burst Mode operation reduces IQ to 2.5µA at no load while maintaining regulation, and its 30ns minimum on-time enables high VIN/VOUT ratios (e.g., 42V→5V at 700kHz).
It integrates top/bottom NMOS power switches (120mΩ/65mΩ), supports BIAS pin operation for improved light-load efficiency, and includes PG flag with ±9% output voltage monitoring, EN/UV with 1.0V threshold, and SYNC input for external clock synchronization or pulse-skipping mode selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24/36V rails |
| Output Voltage | Fixed 5.00V ±1.5% - internally trimmed; no external feedback resistors required |
| Max Output Current | 3.5A continuous - enables single-chip 5V/3.5A power for ECUs, infotainment, and ADAS modules |
| Quiescent Current | 2.5µA at 12VIN→5VOUT - sustains ultra-low standby power in always-on automotive systems |
| Min On-Time | 30ns - allows high step-down ratio operation (e.g., 42V→5V @ 700kHz) without pulse skipping |
| Switching Frequency | 200kHz–2.2MHz - programmable via RT pin; enables EMI optimization and compact magnetics |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive deployment |
Pinout & Package
LT8610ABHMSE-5#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 for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock interface | Enables synchronization to external clock or selects pulse-skipping mode when tied high; must not float |
| TR/SS (2) | Soft-start & tracking control | Programs output ramp rate via capacitor; pulls low during fault/shutdown via 230Ω internal MOSFET |
| RT (3) | Frequency programming | Resistor-to-ground sets oscillator frequency (e.g., 60.4kΩ → 700kHz); disables foldback when SYNC is high |
| EN/UV (4) | Enable & undervoltage lockout | 1.0V rising threshold enables operation; hysteresis prevents chatter during brownout conditions |
| VIN (5,6) | Main power input | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass near pins |
| NC (7) | No connect | Internally unconnected; leave unpopulated or grounded per layout best practice |
| GND (8) | Power ground return | Return path for bottom switch; must tie to exposed pad (Pin 17) for thermal performance |
| SW (9,10,11) | Switch node | Drives external inductor and BST capacitor; requires minimal PCB area to reduce EMI |
| BST (12) | Bootstrap supply | Requires 0.1µF ceramic capacitor to SW for top switch gate drive; critical for high-side NMOS turn-on |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies internal logic; draws from BIAS if VBIAS > 3.1V |
| BIAS (14) | Efficiency-optimized bias source | Tie to VOUT (5V) to reduce VIN current draw and improve light-load efficiency |
| PG (15) | Power good flag | Open-drain output signals ±9% regulation window and fault status; valid above 3.4VIN |
| VOUT (16) | Regulated 5V output | Fixed 5V output with internal 12.5MΩ divider; connects directly to load and output capacitors |
| GND (17) | Exposed thermal pad | Must be soldered to PCB copper pour for thermal dissipation and low-inductance ground return |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation up to +150°C junction temperature |
| 2.5µA Burst Mode IQ | Enables >1-year battery life in always-on vehicle modules powered from 12V lead-acid |
| 30ns minimum on-time | Supports direct 42V→5V conversion at 700kHz without requiring multi-stage regulation |
| Integrated 5V feedback divider | Eliminates external resistor network, reducing BOM count and improving accuracy over temperature |
| BIAS pin operation | Reduces VIN current draw and improves light-load efficiency by sourcing INTVCC from VOUT |
| PG flag with ±9% tolerance | Provides reliable system-level power sequencing and fault detection without external comparators |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interfaces in engine bay environments with 42V cold-crank transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with AEC-Q100 Grade H reliability and 2.5µA standby IQ. Use Value: Eliminates need for pre-regulator stages; withstands 42V transients while maintaining regulation during cranking. | Use Scenario: Providing stable 5V rail for isolated digital I/O drivers and fieldbus communication ICs in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency, low-noise 5V supply with programmable frequency to avoid noise coupling into analog signal paths. Use Value: 30ns min on-time enables single-stage 24V→5V conversion; BIAS pin reduces heat generation in enclosed enclosures. |
| GSM Base Station Power Management | Medical Portable Diagnostic Device |
Use Scenario: Generating 5V for RF front-end ICs and baseband processors in outdoor telecom equipment operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-reliability 5V buck converter with extended temperature range and low EMI due to synchronized switching. Use Value: SYNC pin allows alignment to system clock, reducing spectral spreading and easing EMI filter design. | Use Scenario: Powering ARM-based SoC, display controller, and USB PHY in battery-powered handheld diagnostics with strict standby power limits. IC Role / Device Role / Timing Role: Ultra-low-IQ 5V regulator enabling >72-hour battery life in sleep mode while supporting fast wake-up. Use Value: 2.5µA IQ extends battery runtime; PG flag ensures safe processor boot sequence before firmware execution. |
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 |
|---|---|---|---|
| LT8610AHMSE-5#PBF | Same 5V fixed-output, 3.5A, 30ns min on-time, but LT8610A variant (not AB); 82% light-load efficiency vs 91% for LT8610AB | Lacks LT8610AB's improved Burst Mode efficiency; higher output ripple at light loads | Select when lowest possible output ripple is prioritized over peak light-load efficiency |
| LT8640SHE#PBF | 42V, 6A, 5V fixed output, 25ns min on-time, 2.5µA IQ, but requires external feedback resistors (not integrated divider) | Higher current capability and tighter min on-time, but adds two external resistors and lacks pin-for-pin compatibility | Select when >3.5A output or sub-30ns on-time is required; accepts added BOM complexity for scalability |
Compared with LT8610AHMSE-5#PBF, the LT8610ABHMSE-5#PBF delivers 9% higher light-load efficiency (91% vs 82%) at the cost of slightly higher output ripple-ideal for battery-sensitive automotive modules. Versus LT8640SHE#PBF, it trades 2.5A extra current and 5ns faster switching for zero-resistor simplicity and guaranteed AEC-Q100 Grade H compliance.
Availability
LT8610ABHMSE-5#PBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial PLC I/O modules, and portable medical diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8610ABHMSE-5#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 LT8610A/LT8610AB series was designed specifically for automotive and industrial applications demanding ultra-low quiescent current, high input voltage tolerance, and AEC-Q100 reliability-enabling single-stage 42V-to-5V conversion in space-constrained, thermally demanding environments.
FAQ
What is the maximum junction temperature rating for the LT8610ABHMSE-5#PBF?
The LT8610ABHMSE-5#PBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This specification is confirmed in the Absolute Maximum Ratings table and applies across the full –40°C to +150°C operating junction temperature range, with thermal derating recommended above 125°C for extended lifetime.
Does the LT8610ABHMSE-5#PBF require external feedback resistors to set the 5V output?
No, the LT8610ABHMSE-5#PBF does not require external feedback resistors. It integrates a precision 12.5MΩ internal feedback divider that regulates the VOUT pin to 5.00V ±1.5%. This eliminates external components, improves accuracy over temperature, and reduces board space-confirmed in the Pin Functions section and Electrical Characteristics table.
How does the BIAS pin improve efficiency in the LT8610ABHMSE-5#PBF?
The BIAS pin on the LT8610ABHMSE-5#PBF allows the internal 3.4V regulator (INTVCC) to draw current from VOUT instead of VIN when VBIAS ≥ 3.1V. Since VOUT = 5V in this part, connecting BIAS to VOUT reduces power loss in the VIN-to-INTVCC LDO path, improving light-load efficiency-verified in the Applications Information section and Bias Pin Current graphs.
What is the purpose of the exposed pad (Pin 17) on the LT8610ABHMSE-5#PBF package?
The exposed pad (Pin 17) on the LT8610ABHMSE-5#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve θJC(PAD) = 10°C/W and ensure reliable thermal dissipation. This is mandatory for operation at full 3.5A load and is explicitly required in the MSE Package mechanical drawing and Pin Functions description.
Can the LT8610ABHMSE-5#PBF synchronize to an external clock, and what happens when it does?
Yes, the LT8610ABHMSE-5#PBF can synchronize to an external clock via the SYNC pin (Pin 1). When a clock signal is applied, the device enters pulse-skipping mode and aligns positive SW transitions to the external clock edges. This disables frequency foldback and enables precise EMI spectrum control-documented in the PIN FUNCTIONS and OPERATION sections.
LT8610ABHMSE-5#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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 2.24MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610ABHMSE-5#PBF FAQ
1.How can I place an order for LT8610ABHMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ABHMSE-5#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 LT8610ABHMSE-5#PBF reliable?
The price and inventory of LT8610ABHMSE-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610ABHMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ABHMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ABHMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ABHMSE-5#PBF?
LT8610ABHMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ABHMSE-5#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 LT8610ABHMSE-5#PBF?
For technical support, including LT8610ABHMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ABHMSE-5#PBF requirements.
6.How does Aetrix verify that LT8610ABHMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ABHMSE-5#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 LT8610ABHMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ABHMSE-5#PBF?
All LT8610ABHMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ABHMSE-5#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 LT8610ABHMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT8610ABHMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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