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Analog Devices Inc. LT8610ABIMSE-3.3#PBF
- Part No.:
- LT8610ABIMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ABIMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:354
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Product details
Overview
LT8610ABIMSE-3.3#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current, fixed 3.3V output, 30ns minimum on-time, and AEC-Q100 qualification for automotive power supplies. It operates across 3.4V–42V input, delivers <10mVP-P ripple (LT8610A variant), and integrates soft-start, power-good flag, and external frequency synchronization.
For engineers reviewing the LT8610ABIMSE-3.3#PBF datasheet, LT8610ABIMSE-3.3#PBF pinout, LT8610ABIMSE-3.3#PBF application, or LT8610ABIMSE-3.3#PBF equivalent, key selection criteria include ultralow IQ in regulation, 3.3V fixed-output accuracy (±0.6% over temp), 30ns min-on-time for high VIN/VOUT ratios, EMI-optimized Silent Switcher architecture, and MSOP-16 thermally enhanced package with exposed GND pad.
Technical Context
The LT8610ABIMSE-3.3#PBF employs constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz) via RT resistor. Its internal 0.97V reference regulates the VOUT pin to 3.3V using a 14.3MΩ integrated feedback divider, eliminating external resistors and minimizing no-load current.
Burst Mode® operation enables 2.5µA IQ at no load while maintaining regulation; the LT8610AB variant improves light-load efficiency to 91% (vs 82% for LT8610A) at 1mA with higher burst current limit (1A vs 400mA), trading increased output ripple for lower quiescent power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24V/36V rails without pre-regulation. |
| Output Voltage | Fixed 3.3V ±0.6% over –40°C to +125°C - eliminates external feedback network, reduces BOM count and no-load current. |
| Max Output Current | 3.5A continuous - sufficient for powering microcontrollers, FPGAs, and sensor clusters in automotive ECUs. |
| Quiescent Current | 2.5µA in Burst Mode® at 12VIN→3.3VOUT - enables always-on systems with multi-year battery life in telematics or ADAS modules. |
| Min On-Time | 30ns - allows direct 42V-to-3.3V conversion at 700kHz (17:1 ratio), avoiding cascaded regulation stages. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - enables optimization for size (high-freq) or EMI/efficiency (low-freq). |
| Power-Good Flag | PG asserts when VOUT is within ±9% of 3.3V - provides reliable system reset and sequencing control without external monitoring. |
Pinout & Package
LT8610ABIMSE-3.3#PBF uses a thermally enhanced 16-lead plastic MSOP package with exposed GND pad (Pin 17), θJA = 40°C/W, requiring soldering of the pad for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Ground for low-ripple Burst Mode; tie to logic high or external clock for pulse-skipping mode; disables frequency foldback when driven. |
| TR/SS (2) | Soft-start/tracking control | Capacitor-programmable voltage ramp rate; internal 2.2µA pull-up enables simple soft-start; pulled low during fault/shutdown. |
| RT (3) | Frequency setting resistor | Resistor to GND sets oscillator frequency from 200kHz to 2.2MHz; determines inductor size and EMI profile. |
| EN/UV (4) | Enable/undervoltage lockout | 1.0V rising threshold with 40mV hysteresis - enables precise input UVLO or remote enable control. |
| VIN (5,6) | Main input power supply | High-current path for topside switch and internal circuitry; requires local 1µF ceramic bypass close to pins. |
| NC (7) | No connect | Not bonded internally; must remain unconnected per datasheet. |
| GND (8) | Signal and power ground | Return path for bottom switch; tied to exposed pad (Pin 17) - mandatory soldering required for thermal and electrical integrity. |
| VOUT (16) | Regulated 3.3V output | Fixed-output pin with internal 14.3MΩ feedback divider - no external resistors needed; connects directly to load and output capacitor. |
| PG (15) | Open-drain power-good flag | Pulled low until VOUT reaches 3.003V–3.597V; valid above 3.4V VIN regardless of EN state - enables safe system boot. |
| BIAS (14) | Bias supply input | Tie to VOUT (≥3.3V) to reduce VIN current draw and improve efficiency; bypass with 1µF if sourced externally. |
| INTVCC (13) | Internal 3.4V regulator bypass | Must be decoupled with ≥1µF ceramic cap; powers gate drivers and control logic; sourced from BIAS if >3.1V, else from VIN. |
| BST (12) | Bootstrap capacitor connection | Connects to 0.1µF ceramic cap between BST and SW - provides gate drive voltage >VIN for top MOSFET. |
| SW (9,10,11) | Switch node | High dv/dt node connecting internal MOSFETs to inductor and BST cap; requires minimal PCB area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (–40°C to +125°C junction), supporting reliability-critical ECU and ADAS designs. |
| Ultralow 2.5µA quiescent current | Enables >10-year battery life in always-on automotive modules such as CAN gateways and tire pressure sensors. |
| 30ns minimum on-time | Permits single-stage 42V-to-3.3V conversion at 700kHz, reducing component count and board space versus two-stage solutions. |
| Integrated 3.3V fixed output | Eliminates external feedback resistors and associated leakage paths, preserving ultralow IQ and improving long-term stability. |
| EMI-optimized Silent Switcher architecture | Reduces radiated emissions by controlling switch node ringing and magnetic field coupling - simplifies EMC compliance testing. |
| Programmable soft-start via TR/SS | Capacitor-based ramp control prevents inrush current and enables precise power sequencing with other rails. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering ARM-based application processors and DDR memory in head-unit systems with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering 3.5A with tight line/load regulation and fast transient response to processor DVFS events. Use Value: 2.5µA IQ extends backup battery life during vehicle sleep mode; 30ns min-on-time avoids need for intermediate 5V stage. | Use Scenario: Providing stable 3.3V rail for isolated digital I/O ASICs and communication interfaces (RS-485, CAN) in factory automation controllers. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with PG flag enabling safe firmware-initiated power sequencing and watchdog reset coordination. Use Value: AEC-Q100 qualification ensures operation under industrial temperature extremes; 42V input withstands 24V system surges. |
| GSM Base Station RF Power Amplifier Bias | Medical Portable Diagnostic Device |
Use Scenario: Generating low-noise 3.3V bias for GaAs pHEMT driver stages in small-cell BTS radios where standby power and thermal density are critical. IC Role / Device Role / Timing Role: Efficient, low-ripple DC/DC converter operating in Burst Mode® during idle periods and transitioning seamlessly to full PWM under transmit bursts. Use Value: 91% efficiency at 1mA (LT8610AB) minimizes self-heating in sealed enclosures; EMI reduction eases coexistence with sensitive RF front-ends. | Use Scenario: Powering low-power MCU, OLED display, and analog front-end in handheld ultrasound or glucose monitors running from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Always-on 3.3V supply with programmable soft-start and accurate PG flag ensuring deterministic boot and low-power sleep entry. Use Value: Fixed 3.3V output eliminates resistor tolerance errors; 2.5µA IQ enables multi-week operation on 500mAh battery in sleep mode. |
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 |
|---|---|---|---|
| LT8610AIMSE-3.3#PBF | Same 3.3V fixed output, 3.5A rating, and 2.5µA IQ, but LT8610A variant has 82% light-load efficiency (vs 91% for LT8610AB) and lower burst-mode current limit (400mA vs 1A). | Preferred where lowest possible output ripple is required at light loads, such as precision analog sensor biasing. | Select LT8610AIMSE-3.3#PBF when ultra-low noise trumps peak light-load efficiency; both share identical pinout and layout. |
| LMQ61460RWR | TI's 60V, 6A buck with 15µA IQ, 3.3V fixed option, and integrated compensation - lacks AEC-Q100 rating and has higher quiescent current. | Suitable for industrial or consumer applications where automotive qualification is not required and higher output current is needed. | Choose LMQ61460RWR only for non-automotive designs needing >3.5A or simplified design-in; not drop-in due to different pinout and control scheme. |
Compared with LT8610AIMSE-3.3#PBF, the LT8610ABIMSE-3.3#PBF delivers 9% higher efficiency at 1mA load - critical for battery longevity - while accepting slightly higher ripple; versus LMQ61460RWR, it offers automotive qualification and lower IQ but less output current headroom.
Availability
LT8610ABIMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and portable medical diagnostics requiring stable component supply, AEC-Q100 compliance, and ultralow quiescent current performance.
Supply support for LT8610ABIMSE-3.3#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 LT8610A/LT8610AB series was designed specifically for automotive and industrial applications demanding ultralow IQ, wide input range, and robust operation under voltage transients - targeting ECU, ADAS, and battery-powered edge devices.
FAQ
What is the guaranteed output voltage accuracy of the LT8610ABIMSE-3.3#PBF over temperature?
The LT8610ABIMSE-3.3#PBF guarantees 3.3V output within ±0.6% over the full –40°C to +125°C junction temperature range, as confirmed by datasheet Table "Output Voltage (LT8610A-3.3/LT8610AB-3.3)" with min/max values of 3.26V and 3.34V at 0.5A load. This accuracy derives from its trimmed internal 14.3MΩ feedback divider and 0.970V reference.
Does the LT8610ABIMSE-3.3#PBF require external feedback resistors?
No, the LT8610ABIMSE-3.3#PBF does not require external feedback resistors. It integrates a precision 14.3MΩ internal resistor divider that sets the output to exactly 3.3V at the VOUT pin (Pin 16), eliminating external components, reducing BOM cost, and removing resistor-related leakage paths that degrade ultralow IQ performance.
How does the LT8610ABIMSE-3.3#PBF achieve 2.5µA quiescent current?
The LT8610ABIMSE-3.3#PBF achieves 2.5µA IQ through optimized Burst Mode® operation: between energy bursts, all switching and control circuitry shuts down, drawing only 1.7µA from VIN (per datasheet Table "VIN Quiescent Current"). The fixed 3.3V output eliminates external feedback current, and internal trimming minimizes bias currents - resulting in 2.5µA typical total input current at no load, 12VIN→3.3VOUT.
Can the LT8610ABIMSE-3.3#PBF operate from a 42V input while delivering 3.3V output?
Yes, the LT8610ABIMSE-3.3#PBF supports 42V maximum input and can deliver 3.3V output directly. Its 30ns minimum on-time enables a 12.7:1 step-down ratio at 700kHz (42V→3.3V), satisfying the requirement without cascaded converters. Datasheet Figure "Minimum On-Time" confirms 30ns is maintained across temperature and load, validating single-stage operation.
Is the LT8610ABIMSE-3.3#PBF pin-compatible with the LT8610AIMSE-3.3#PBF?
Yes, the LT8610ABIMSE-3.3#PBF is pin-compatible with the LT8610AIMSE-3.3#PBF. Both use identical 16-lead MSOP packages with identical pin functions, layouts, and thermal pad requirements. The only differences are internal optimizations: LT8610AB delivers 91% efficiency at 1mA versus 82% for LT8610A, with higher burst current limit and slightly increased ripple - no PCB changes are required for substitution.
LT8610ABIMSE-3.3#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):
- 3.3V
- 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
LT8610ABIMSE-3.3#PBF FAQ
1.How can I place an order for LT8610ABIMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ABIMSE-3.3#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 LT8610ABIMSE-3.3#PBF reliable?
The price and inventory of LT8610ABIMSE-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8610ABIMSE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ABIMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ABIMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ABIMSE-3.3#PBF?
LT8610ABIMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ABIMSE-3.3#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 LT8610ABIMSE-3.3#PBF?
For technical support, including LT8610ABIMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ABIMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT8610ABIMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ABIMSE-3.3#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 LT8610ABIMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ABIMSE-3.3#PBF?
All LT8610ABIMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ABIMSE-3.3#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 LT8610ABIMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8610ABIMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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