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Analog Devices Inc. LT8610AIMSE-5#PBF
- Part No.:
- LT8610AIMSE-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610AIMSE-5#PBF.pdf
- Description:
- IC REG BUCK 5V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
LT8610AIMSE-5#PBF from Analog Devices is a 42V input, 5V fixed-output synchronous step-down regulator delivering up to 3.5A continuous output current with 2.5µA quiescent current in Burst Mode® operation. It features a 30ns minimum on-time, 200kHz–2.2MHz adjustable switching frequency, and operates in automotive-grade –40°C to 125°C junction temperature range. Used in automotive infotainment power supplies where ultra-low IQ and high VIN tolerance are critical.
For engineers reviewing the LT8610AIMSE-5#PBF datasheet, LT8610AIMSE-5#PBF pinout, LT8610AIMSE-5#PBF application, or LT8610AIMSE-5#PBF equivalent, key selection considerations include its 5V fixed output, 3.5A capability at 42V max input, AEC-Q100 qualification, low dropout (200mV @ 1A), and compatibility with BIAS pin biasing for improved light-load efficiency.
Technical Context
The LT8610AIMSE-5#PBF implements constant-frequency current-mode control with internal 0.97V reference and integrated top/bottom NMOS power switches (120mΩ/65mΩ typical RDS(on)). Its oscillator supports RT-resistor programming and external synchronization via SYNC pin, while frequency foldback activates during startup or overcurrent to limit inductor current.
Burst Mode® operation enables ultralow 2.5µA quiescent current by disabling internal circuitry between switching bursts; pulse-skipping mode (enabled by pulling SYNC high) maintains continuous oscillator operation but increases IQ to several hundred µA. The device uses internal 12.5MΩ feedback divider for precise 5V regulation (±0.6% over temp) and includes PG flag with ±9% output voltage monitoring.
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 (≤42V). |
| Output Voltage | Fixed 5.00V ±0.6% - internally trimmed; eliminates external resistor divider and reduces BOM count and leakage error. |
| Max Output Current | 3.5A continuous - enables single-chip 5V/3.5A rail for SoC or FPGA core logic without external pass devices. |
| Quiescent Current | 2.5µA at no load - sustains >1-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Min On-Time | 30ns - allows high VIN-to-VOUT conversion (e.g., 42V→5V) at 2.2MHz without pulse skipping or instability. |
| Switching Frequency | 200kHz–2.2MHz - programmable via RT pin; enables EMI optimization and compact magnetics (e.g., 4.7µH at 700kHz). |
| Dropout Voltage | 200mV @ 1A - ensures regulation down to VIN = 5.2V, critical for low-voltage brownout conditions. |
Pinout & Package
LT8610AIMSE-5#PBF is housed in a thermally enhanced 16-lead MSOP package with exposed GND pad (Pin 17), requiring PCB soldering for thermal performance (θJA = 40°C/W). Pin 7 is NC; Pins 5/6 and 9/10/11 are paralleled for high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Pull low for low-ripple Burst Mode; tie to INTVCC or external clock for pulse-skipping/sync operation. |
| TR/SS (2) | Soft-start and tracking control | Capacitor here sets VOUT ramp rate; also enables output voltage tracking of another supply. |
| RT (3) | Frequency programming | Resistor to GND sets fSW (e.g., 60.4kΩ → 700kHz); enables EMI spread-spectrum tuning. |
| EN/UV (4) | Enable and input UVLO | 1.00V rising threshold; resistor divider from VIN enables custom undervoltage lockout (e.g., 6V cutoff). |
| VIN (5,6) | Main input power | Paralleled high-current inputs; must be locally bypassed with low-ESR ceramic capacitor near pins. |
| NC (7) | No connect | Not bonded; leave unconnected and unrouted on PCB. |
| GND (8) | Power ground return | Return path for bottom switch; must be tied to exposed pad (Pin 17) for thermal and electrical integrity. |
| SW (9,10,11) | Switch node | High dv/dt node connecting to inductor and BST capacitor; minimize trace area to reduce EMI. |
| BST (12) | Bootstrap supply | 0.1µF ceramic capacitor to SW provides gate drive voltage for top NMOS; critical for 100% duty cycle. |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers internal logic; draws from BIAS if VBIAS > 3.1V, else from VIN. |
| BIAS (14) | Efficiency-optimized bias supply | Tie to VOUT (5V) to reduce VIN current draw and improve light-load efficiency; requires local 1µF bypass. |
| PG (15) | Power good flag | Open-drain output asserts high when VOUT is within ±9% of 5V and no fault (e.g., overtemp, UVLO) exists. |
| VOUT (16) | Regulated 5V output | Fixed 5V output pin; connects internally to 12.5MΩ feedback divider; decoupled with ≥47µF bulk capacitance. |
| GND (17) | Exposed thermal pad | Mandatory solder connection to PCB ground plane; reduces θJA by ~25°C/W and improves reliability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (Grade I: –40°C to +125°C junction), enabling use in infotainment, ADAS, and body electronics without derating. |
| Ultralow 2.5µA quiescent current | Extends battery runtime in always-on systems; achieves <10µA system sleep current when paired with low-IQ downstream regulators. |
| 30ns minimum on-time | Enables direct 42V-to-5V conversion at 2.2MHz, eliminating intermediate stages and reducing solution size by >30% vs. two-stage designs. |
| Internal 12.5MΩ feedback divider | Eliminates external resistors and associated leakage paths, preserving accuracy and simplifying layout for fixed 5V output. |
| BIAS pin support | Reduces total input current by sourcing INTVCC from VOUT instead of VIN, improving full-load efficiency by up to 1.5% at 12V input. |
| Robust protection suite | Includes thermal shutdown, overcurrent limiting (6.7A top switch), PG fault reporting, and VIN UVLO with 40mV hysteresis for stable start-up. |
Applications
| Automotive Infotainment Power | GSM Base Station RF Power |
|---|---|
|
Use Scenario: Powering SoC, DSP, and display interface ICs in head units with battery input ranging from 5.5V (cold crank) to 42V (load dump). IC Role / Device Role / Timing Role: Primary 5V/3.5A buck converter supplying core logic rails; operates in Burst Mode during standby to meet ISO 16750-2 quiescent current requirements. Use Value: Eliminates need for pre-regulator stage; 2.5µA IQ extends vehicle-off battery life beyond 1 year; AEC-Q100 qualification ensures field reliability. |
Use Scenario: Generating stable 5V rail for RF power amplifier biasing in remote radio heads exposed to wide ambient temperatures (–40°C to +85°C). IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator; synchronized to system clock via SYNC pin to avoid beat frequencies in sensitive RF bands. Use Value: 30ns min on-time supports 28V-to-5V conversion at 1MHz; low EMI design minimizes conducted noise into adjacent RF sections. |
| Industrial IoT Sensor Hub | Medical Portable Diagnostic Device |
|
Use Scenario: Powering microcontroller, BLE/Wi-Fi module, and analog front-end in battery- or energy-harvesting–powered edge nodes. IC Role / Device Role / Timing Role: Primary DC/DC converter with TR/SS pin used for controlled power-up sequencing across multiple subsystems. Use Value: 2.5µA IQ enables multi-year operation on coin-cell batteries; 42V rating accommodates 24V industrial bus transients without clamping diodes. |
Use Scenario: Providing regulated 5V for ADCs, touch controllers, and display drivers in handheld ultrasound or glucose meters with strict EMC and safety requirements. IC Role / Device Role / Timing Role: Isolated secondary-side buck regulator; PG pin monitors output health and triggers system fault logging before shutdown. Use Value: ±9% PG window ensures accurate power-good assertion; low dropout (200mV @ 1A) maintains regulation during battery sag under pulse loads. |
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 |
|---|---|---|---|
| LT8610ABIMSE-5#PBF | Same package and pinout; improved light-load efficiency (91% vs. 82% at 1mA, 12V→5V) but higher output ripple in Burst Mode. | Preferred for battery-powered applications prioritizing runtime over ripple-sensitive analog circuits. | Select LT8610ABIMSE-5#PBF when >10% light-load efficiency gain justifies added output capacitance for ripple suppression. |
| LM61480RQRVCR | 42V, 8A, 2.5µA IQ, 35ns min on-time; different pinout (16-pin WQFN), no BIAS pin, lower RDS(on) (40mΩ/22mΩ). | Higher current capability suits systems scaling beyond 3.5A; lacks AEC-Q100 qualification and internal fixed-divider option. | Choose LM61480RQRVCR for non-automotive 5V/5A+ rails where board space permits larger inductor and higher peak current handling. |
Compared with LT8610ABIMSE-5#PBF, the LT8610AIMSE-5#PBF trades 9% light-load efficiency for lower output ripple and simpler output filtering; versus LM61480RQRVCR, it offers AEC-Q100 compliance and fixed 5V configuration at the cost of lower current rating and no pin compatibility.
Availability
LT8610AIMSE-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor hubs, and portable medical diagnostics requiring stable component supply, AEC-Q100 qualification, and ultralow quiescent current performance.
Supply support for LT8610AIMSE-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 industrial, automotive, communications, and healthcare markets.
The LT8610A series was designed specifically for automotive and industrial applications demanding ultralow IQ, high input voltage tolerance, and robust operation across extreme temperature ranges.
FAQ
What is the guaranteed operating temperature range for LT8610AIMSE-5#PBF?
The LT8610AIMSE-5#PBF is specified and guaranteed over a junction temperature range of –40°C to +125°C, meeting AEC-Q100 Grade I requirements. This makes it suitable for under-hood and dashboard-mounted automotive electronics where ambient temperatures exceed 85°C and thermal cycling is severe. The device includes integrated thermal shutdown that activates above 150°C to protect against sustained overload.
Does LT8610AIMSE-5#PBF require an external feedback resistor divider?
No, the LT8610AIMSE-5#PBF does not require an external feedback resistor divider because it integrates a precision 12.5MΩ internal resistor network to set the fixed 5.00V output. This eliminates external component count, leakage-induced errors, and layout sensitivity-critical for maintaining accuracy and ultralow quiescent current in battery-powered systems.
How does the BIAS pin improve efficiency in LT8610AIMSE-5#PBF?
The BIAS pin on the LT8610AIMSE-5#PBF allows the internal 3.4V regulator (INTVCC) to draw current from the 5V output rail instead of the main VIN supply when VBIAS ≥ 3.1V. This reduces total input current draw, improving full-load efficiency by up to 1.5% at 12V input and lowering thermal stress on the input stage-especially beneficial in high-current, high-input-voltage applications.
Can LT8610AIMSE-5#PBF synchronize to an external clock?
Yes, the LT8610AIMSE-5#PBF supports external clock synchronization via the SYNC pin (Pin 1). When driven with a TTL/CMOS-compatible square wave between 200kHz and 2.2MHz, the device aligns its switching edges to the external clock, suppressing beat frequencies and easing EMI filter design in noise-sensitive systems like automotive radar or medical imaging.
What protection features are built into LT8610AIMSE-5#PBF?
The LT8610AIMSE-5#PBF includes overcurrent protection (6.7A top switch limit), thermal shutdown (>150°C), input undervoltage lockout (1.00V EN/UV threshold with 40mV hysteresis), and power-good monitoring (PG flag asserts low if VOUT deviates >±9% or fault occurs). These features ensure safe, autonomous operation in unattended systems such as telematics or remote sensors without external supervision.
LT8610AIMSE-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 ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610AIMSE-5#PBF FAQ
1.How can I place an order for LT8610AIMSE-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610AIMSE-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 LT8610AIMSE-5#PBF reliable?
The price and inventory of LT8610AIMSE-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 LT8610AIMSE-5#PBF is usually 5 days.
3.What payment methods are accepted for LT8610AIMSE-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610AIMSE-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610AIMSE-5#PBF?
LT8610AIMSE-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610AIMSE-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 LT8610AIMSE-5#PBF?
For technical support, including LT8610AIMSE-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610AIMSE-5#PBF requirements.
6.How does Aetrix verify that LT8610AIMSE-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610AIMSE-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 LT8610AIMSE-5#PBF meets industry standards.
7.What is the process for return or replacement of LT8610AIMSE-5#PBF?
All LT8610AIMSE-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610AIMSE-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 LT8610AIMSE-5#PBF part is unused and in its original packaging.
Return procedure for LT8610AIMSE-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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