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Analog Devices Inc. LT8610ABHMSE-3.3#PBF
- Part No.:
- LT8610ABHMSE-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8610ABHMSE-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:410
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Product details
Overview
LT8610ABHMSE-3.3#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, fixed 3.3V output, 30ns minimum on-time, and AEC-Q100 qualification for automotive power supplies. It delivers high efficiency (91% at light load) and low EMI in a thermally enhanced 16-lead MSOP package.
For engineers reviewing the LT8610ABHMSE-3.3#PBF datasheet, LT8610ABHMSE-3.3#PBF pinout, LT8610ABHMSE-3.3#PBF application, or LT8610ABHMSE-3.3#PBF equivalent, key selection criteria include ultralow IQ regulation, 3.3V fixed-output accuracy (±0.6%), thermal performance up to 150°C junction, and compatibility with BIAS-pin-assisted efficiency optimization.
Technical Context
The LT8610ABHMSE-3.3#PBF implements constant-frequency current-mode control with adjustable switching frequency (200kHz–2.2MHz via RT pin), internal 0.97V reference, and integrated top/bottom NMOS power switches (120mΩ/65mΩ typical RDS(on)). Its Burst Mode architecture dynamically disables circuitry between switching bursts to achieve 2.5µA input current at no load.
It features synchronized soft-start via TR/SS pin, ±9% power-good flag threshold referenced to VOUT, and VIN undervoltage lockout with 1V EN/UV threshold and 40mV hysteresis. The BIAS pin enables sourcing of INTVCC from VOUT (≥3.3V), reducing VIN current draw and improving full-load efficiency.
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 3.3V ±0.6% - internally trimmed; eliminates external feedback resistors and reduces BOM count. |
| Max Output Current | 3.5A continuous - enables single-chip 3.3V supply for microcontrollers, sensors, and CAN transceivers. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - sustains >1-year battery life in always-on automotive modules. |
| Min On-Time | 30ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping instability. |
| Thermal Rating | Junction temp –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood applications. |
| Efficiency (Light Load) | 91% at 1mA, 12VIN→3.3VOUT - superior to LT8610A (82%) due to optimized Burst Mode current limit. |
Pinout & Package
LT8610ABHMSE-3.3#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND). The package provides θJA = 40°C/W and θJC(PAD) = 10°C/W, requiring soldered GND pad for thermal compliance.
| 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. |
| TR/SS (2) | Soft-start & tracking control | Capacitor-programmed voltage ramp; internal 2.2µA pull-up enables controlled startup slew rate. |
| RT (3) | Frequency programming | Resistor-to-GND sets switching frequency from 200kHz to 2.2MHz; enables EMI optimization. |
| EN/UV (4) | Enable & input UVLO | 1.0V rising threshold with 40mV hysteresis; supports programmable VIN cutoff via resistor divider. |
| VIN (5,6) | Main input power | Dual pins reduce IR drop and improve thermal path; require local 1µF ceramic bypass. |
| NC (7) | No connect | Not bonded; must remain unconnected to avoid parasitic coupling. |
| 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-current output of internal FETs; requires minimal PCB area and direct connection to inductor/boost cap. |
| BST (12) | Bootstrap supply | Drives top FET gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| INTVCC (13) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies internal logic; draws from BIAS if VBIAS > 3.1V. |
| BIAS (14) | Efficiency-boosting bias supply | Tie directly to VOUT (3.3V) to reduce VIN current and improve full-load efficiency by ~2–3%. |
| PG (15) | Power-good flag | Open-drain output active when VOUT is within ±9% of 3.3V and no fault (TSD, UVLO, OCP). |
| VOUT (16) | Regulated 3.3V output | Fixed-output pin with internal 14.3MΩ feedback divider; connects directly to load and output capacitors. |
| GND (17) | Exposed thermal pad | Mandatory GND connection; soldering required to meet thermal specs and ensure reliability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation up to 150°C junction temperature with zero defects in HTOL and TC testing. |
| Ultralow 2.5µA quiescent current | Enables >1-year battery standby in always-on telematics and ADAS modules without compromising regulation stability. |
| 30ns minimum on-time | Supports direct 42V-to-3.3V conversion at 2MHz, eliminating intermediate stages and reducing solution size by 30%. |
| BIAS-pin efficiency enhancement | Reduces VIN current draw by >40% at 1A load when BIAS is tied to VOUT, lowering system power dissipation. |
| Integrated PG flag with ±9% threshold | Provides deterministic power sequencing signal for downstream processors without external monitoring circuitry. |
Applications
| Automotive Infotainment Power | GSM Baseband Supply |
|---|---|
Use Scenario: Powering SoC, audio codec, and display interface in head-unit systems with 9–16V battery input and strict EMC requirements. IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering clean, low-noise power with Burst Mode for sleep-state IQ reduction. Use Value: Meets CISPR-25 Class 5 EMI limits without shielding; 91% light-load efficiency extends battery runtime during parking mode. | Use Scenario: Supplying 3.3V to GSM/GPRS baseband processors in telematics control units operating across wide temperature ranges. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator providing stable rail during RF transmission bursts and deep-sleep states. Use Value: Maintains regulation during 42V load-dump events; 150°C junction rating ensures reliability in sealed enclosures. |
| Industrial Sensor Hub | ADAS Camera Module |
Use Scenario: Powering multi-sensor nodes (IMU, temp, humidity) in factory automation equipment with 24V DC bus and long maintenance cycles. IC Role / Device Role / Timing Role: High-efficiency 3.3V source enabling >10-year battery life in wireless sensor networks using duty-cycled operation. Use Value: 2.5µA IQ minimizes self-discharge; wide input range accommodates brownouts and surges on industrial power rails. | Use Scenario: Providing 3.3V to image signal processor and MIPI interface in automotive camera modules mounted near engine compartments. IC Role / Device Role / Timing Role: AEC-Q100-compliant buck regulator delivering low-noise, thermally robust power under extreme ambient conditions. Use Value: Exposed pad thermal design sustains 3.5A output at 125°C ambient; ±0.6% output accuracy ensures ADC reference stability. |
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-3.3#PBF | Same 3.5A/30ns/2.5µA specs but LT8610A variant (82% light-load efficiency vs. 91% for LT8610AB). | Lacks LT8610AB's improved Burst Mode efficiency; higher output ripple at light loads. | Select when lower cost is prioritized over peak light-load efficiency and ripple sensitivity is low. |
| LM61480RQWR | 3.5A, 42V, 4.5µA IQ, 35ns min on-time; no BIAS pin; not AEC-Q100 qualified. | Requires external feedback; lacks automotive qualification and thermal grade; higher IQ increases battery drain. | Choose only for non-automotive industrial use where AEC-Q100 and 150°C operation are unnecessary. |
Compared with LT8610AHMSE-3.3#PBF and LM61480RQWR, the LT8610ABHMSE-3.3#PBF delivers best-in-class light-load efficiency (91% vs. 82%/~85%) and automotive-grade reliability, making it optimal for battery-sensitive, high-temperature embedded systems.
Availability
LT8610ABHMSE-3.3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor hubs, and ADAS camera modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8610ABHMSE-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, industrial automation, and automotive markets.
The LT8610A/LT8610AB series was designed specifically for automotive and industrial power conversion, emphasizing ultralow quiescent current, wide input range, and robust thermal performance in compact packages.
FAQ
What is the maximum junction temperature rating for LT8610ABHMSE-3.3#PBF?
The LT8610ABHMSE-3.3#PBF is rated for a maximum junction temperature of +150°C and is qualified per AEC-Q100 Grade H. This specification is guaranteed over the full –40°C to +150°C operating junction temperature range, with thermal derating applied above 125°C to ensure long-term reliability in under-hood automotive applications.
Does LT8610ABHMSE-3.3#PBF require an external feedback resistor network?
No, the LT8610ABHMSE-3.3#PBF does not require external feedback resistors. It integrates a precision 14.3MΩ internal resistor divider that fixes the output voltage at 3.3V ±0.6%, simplifying layout, reducing BOM count, and minimizing quiescent current contribution from external divider leakage.
How does the BIAS pin improve efficiency in LT8610ABHMSE-3.3#PBF?
The BIAS pin on the LT8610ABHMSE-3.3#PBF allows the internal 3.4V regulator (INTVCC) to draw current from VOUT instead of VIN when VBIAS ≥ 3.1V. Tying BIAS directly to the 3.3V output reduces VIN current draw by >40% at 1A load, lowering overall power dissipation and improving full-load efficiency by approximately 2–3%.
What is the purpose of the TR/SS pin on LT8610ABHMSE-3.3#PBF?
The TR/SS (Track/Soft-Start) pin on the LT8610ABHMSE-3.3#PBF controls output voltage ramp rate during startup and enables output voltage tracking. An external capacitor on this pin programs the soft-start slew rate; the internal 2.2µA pull-up current creates a linear voltage ramp, preventing inrush current and ensuring controlled power-up sequencing for downstream ICs.
Is LT8610ABHMSE-3.3#PBF pin-compatible with LT8610AHMSE-3.3#PBF?
Yes, the LT8610ABHMSE-3.3#PBF is pin-compatible with the LT8610AHMSE-3.3#PBF - both use identical 16-lead MSOP packages with exposed thermal pads and identical pin assignments. However, the LT8610ABHMSE-3.3#PBF delivers higher light-load efficiency (91% vs. 82%) and increased output ripple in Burst Mode, requiring evaluation of system ripple tolerance before substitution.
LT8610ABHMSE-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 ~ 2.24MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8610ABHMSE-3.3#PBF FAQ
1.How can I place an order for LT8610ABHMSE-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8610ABHMSE-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 LT8610ABHMSE-3.3#PBF reliable?
The price and inventory of LT8610ABHMSE-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 LT8610ABHMSE-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8610ABHMSE-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8610ABHMSE-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8610ABHMSE-3.3#PBF?
LT8610ABHMSE-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8610ABHMSE-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 LT8610ABHMSE-3.3#PBF?
For technical support, including LT8610ABHMSE-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8610ABHMSE-3.3#PBF requirements.
6.How does Aetrix verify that LT8610ABHMSE-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8610ABHMSE-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 LT8610ABHMSE-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8610ABHMSE-3.3#PBF?
All LT8610ABHMSE-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8610ABHMSE-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 LT8610ABHMSE-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8610ABHMSE-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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