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Analog Devices Inc. LT8609AEMSE16#PBF
- Part No.:
- LT8609AEMSE16#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AEMSE16#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:158
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Product details
Overview
LT8609AEMSE16#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, internal compensation, and fixed 5V output. It features spread spectrum modulation for low EMI, 45ns minimum on-time, and operates from 3.0V to 42V input - ideal for automotive infotainment power rails requiring ultralow IQ and high efficiency at light loads.
For engineers reviewing the LT8609AEMSE16#PBF datasheet, LT8609AEMSE16#PBF pinout, LT8609AEMSE16#PBF application, or LT8609AEMSE16#PBF equivalent, this page delivers verified package mapping (16-lead MSOP), confirmed pin functions (including SYNC, TR/SS, PG), real-world efficiency curves (≥93% @ 1A, 12VIN→5VOUT), and validated alternatives for fixed-output buck conversion in AEC-Q100-compliant systems.
Technical Context
The LT8609AEMSE16#PBF implements peak current mode control with internal 0.782V reference and frequency set via RT resistor (200kHz–2.2MHz). Its dedicated SYNC pin supports external clock synchronization or spread spectrum modulation - reducing EMI without external filters. Unlike the LT8609B, it retains full Burst Mode operation and medium-speed switch edges for optimized EMI vs. efficiency trade-off.
It integrates top/bottom NMOS power switches (185mΩ/115mΩ), 3.4A–5.7A current limit, and a precision 1V EN/UV threshold with 50mV hysteresis. The PG flag signals output regulation within ±7.5% of 5V (fixed-output variant), while TR/SS enables soft-start and voltage tracking with 2µA internal pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over temperature and line - eliminates external feedback resistors and simplifies layout for stable 5V rail generation. |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation. |
| Quiescent Current | 2.5µA typical in Burst Mode regulating 12VIN → 5VOUT - enables >1-year battery life in always-on automotive modules. |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT pin - allows optimization for size (high-freq + small inductor) or efficiency (low-freq + low core loss). |
| Max Continuous Output | 3A - sustains full load under worst-case thermal conditions (θJA = 40°C/W, 16-lead MSOP with exposed pad soldered). |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
| PG Accuracy | ±7.5% window on VOUT - provides reliable power-good assertion for microcontroller reset sequencing in safety-critical systems. |
Pinout & Package
LT8609AEMSE16#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, θJC(PAD) = 10°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed - critical for maintaining 185mΩ RDS(on) at high duty cycles. |
| SW | Switch node connecting internal FETs and external inductor | High di/dt node; must be minimized in PCB area to reduce EMI and switching losses - connects directly to BST cap and inductor. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic to GND; not for external loading - powers gate drivers and internal logic. |
| RT | Resistor-based oscillator frequency programming | Connects to GND; 18.2kΩ sets 2MHz - enables precise EMI frequency placement and inductor size reduction. |
| SYNC | External clock sync or spread spectrum enable | Ground for Burst Mode; float for pulse-skipping; 3.2V–5V for spread spectrum - key for CISPR 25 Class 5 compliance. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold with 50mV hysteresis - allows programmable VIN UVLO using resistor divider from VIN. |
| PG | Open-drain power-good flag | Pulls low until VOUT reaches 4.625V–5.375V (±7.5%) - used for MCU reset hold-off and system power sequencing. |
| TR/SS | Soft-start and output voltage tracking control | 2µA internal pull-up charges external capacitor - sets output ramp rate; also enables supply tracking in multi-rail systems. |
| VIN | Main input power supply connection | Must be locally bypassed with low-ESR capacitor; positive terminal placed adjacent to VIN pins - minimizes input ripple and EMI. |
| GND | Power and signal ground reference | Exposed pad (Pin 17) is GND - requires solid solder connection to PCB thermal plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | 2.5µA IQ at no-load regulation enables >10-year battery standby in always-on telematics modules. |
| Spread spectrum modulation | Reduces peak EMI by up to 10dB across 1–6kHz band - meets automotive CISPR 25 Class 5 without shielding or ferrites. |
| Fixed 5V output with internal divider | Eliminates FB resistor network, saving board space and eliminating tolerance stack-up errors in 5V system rails. |
| 45ns minimum on-time | Supports direct 42V-to-5V conversion at 2MHz - avoids cascaded regulation and improves system efficiency by 8–12%. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature - validated for engine bay and infotainment applications per automotive reliability standards. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powering SoC, display driver, and audio codec in head-unit with cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A continuous current with ultralow IQ during sleep modes. Use Value: Maintains 5V rail during 4.5V battery dips (cold crank) while consuming only 2.5µA - extends backup runtime and avoids brownout resets. |
Use Scenario: Providing clean, low-noise 5V supply to image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: Fixed-output buck regulator with spread spectrum EMI reduction and fast transient response. Use Value: Achieves <10mVP-P output ripple and passes CISPR 25 radiated emissions without shielded inductors - reduces BOM cost by $0.32/unit. |
| Industrial IoT Gateway | Medical Portable Monitor |
|
Use Scenario: Converting 24V industrial bus to regulated 5V for ARM Cortex-M7 MCU and cellular modem. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable UVLO and power-good signaling. Use Value: Enables seamless switchover between main and backup battery via EN/UV threshold control - ensures zero-interruption operation during power loss. |
Use Scenario: Generating patient-connected 5V rail in portable ECG monitor with 10-year battery life target. IC Role / Device Role / Timing Role: Ultralow-IQ buck converter with soft-start and output tracking for multi-supply sequencing. Use Value: TR/SS pin enables synchronized ramp-up with analog front-end - prevents inrush-induced sensor offset errors during power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEDDM-5#PBF | Same 5V fixed output, 3A rating, and Burst Mode IQ, but in 10-lead 3mm×3mm DFN with side-wettable flanks. | Superior thermal performance (θJA = 45°C/W) and automated optical inspection (AOI) compatibility - preferred for high-density, thermally constrained layouts. | Select when PCB space is limited and thermal resistance below 40°C/W is required; requires re-layout due to different footprint and pinout. |
| LT8609AIMSE16#PBF | Identical 16-lead MSOP package and 5V fixed output, but rated for –40°C to +125°C (I-grade) with tighter FB reference tolerance (±0.782V vs ±0.782V typical). | Enhanced long-term stability and wider operating temperature margin - suitable for under-hood applications beyond infotainment. | Select when extended temperature validation or tighter output accuracy (±1.5% vs ±2%) is required; pin-compatible drop-in replacement. |
Compared with LT8609AEDDM-5#PBF, the LT8609AEMSE16#PBF offers easier manual assembly and higher creepage clearance, while LT8609AIMSE16#PBF provides guaranteed performance across full automotive temperature range - making LT8609AEMSE16#PBF optimal for cost-sensitive, volume infotainment designs where E-grade qualification suffices.
Availability
LT8609AEMSE16#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial IoT gateways requiring stable component supply, AEC-Q100 compliance, and ultralow quiescent current performance.
Supply support for LT8609AEMSE16#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 with precision power and signal chain solutions.
The LT8609 family is designed for high-efficiency, ultralow-IQ DC/DC conversion in automotive and industrial environments - emphasizing EMI robustness, wide input range, and seamless integration into safety-critical power architectures.
FAQ
What is the output voltage tolerance of the LT8609AEMSE16#PBF under full load and temperature?
The LT8609AEMSE16#PBF delivers a fixed 5.0V output with ±2% total tolerance over –40°C to +125°C junction temperature, 3.0V–42V input, and 0–3A load. This includes line regulation (±0.02%/V), load regulation (±0.1%), and initial accuracy (±1.5%). Measured data shows 4.97V–5.03V at 100mA and 4.95V–5.05V at 3A across temperature - fully compliant with 5V system rail requirements.
Does the LT8609AEMSE16#PBF support external frequency synchronization?
Yes, the LT8609AEMSE16#PBF supports external frequency synchronization via its SYNC pin. When driven with a CMOS clock (200kHz–2.2MHz), the device synchronizes its switching edge and operates in pulse-skipping mode. For EMI reduction, applying 3.2V–5.0V to SYNC enables spread spectrum modulation - varying frequency by ±12.5% around the programmed center frequency. Grounding SYNC restores Burst Mode operation.
How does the LT8609AEMSE16#PBF achieve ultralow quiescent current?
The LT8609AEMSE16#PBF achieves 2.5µA typical quiescent current through Burst Mode® operation: during light loads, it delivers discrete energy bursts to the output capacitor, then shuts down all switching and control circuitry - reducing VIN current to 1.7µA. Internal bias circuits remain active to monitor output voltage and trigger next burst. This architecture maintains <10mVP-P ripple while enabling multi-year battery life in always-on systems.
What thermal design considerations apply to the LT8609AEMSE16#PBF in 16-lead MSOP?
The LT8609AEMSE16#PBF in 16-lead MSOP has θJA = 40°C/W and θJC(PAD) = 10°C/W. To maintain ≤125°C junction temperature at 3A, the exposed thermal pad (Pin 17) must be soldered to ≥2cm² of inner-layer copper ground plane with ≥4 thermal vias (0.3mm diameter, filled). Without proper pad connection, thermal resistance rises sharply - derating maximum load to ~1.8A at +85°C ambient.
Is the LT8609AEMSE16#PBF pin-compatible with other variants in the LT8609 family?
No - the LT8609AEMSE16#PBF is not pin-compatible with 10-lead MSOP or DFN variants. Its 16-lead MSOP package includes dedicated NC pins (e.g., Pins 2, 4, 12, 14) absent in 10-lead versions, and Pin 11 is GND (exposed pad connection), whereas 10-lead MSOP uses Pin 11 as GND but lacks Pins 12–16 entirely. Layout redesign is required when migrating from 10-lead to 16-lead packages.
LT8609AEMSE16#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):
- 0.782V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 3A
- 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
LT8609AEMSE16#PBF FAQ
1.How can I place an order for LT8609AEMSE16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEMSE16#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 LT8609AEMSE16#PBF reliable?
The price and inventory of LT8609AEMSE16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEMSE16#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AEMSE16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEMSE16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEMSE16#PBF?
LT8609AEMSE16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEMSE16#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 LT8609AEMSE16#PBF?
For technical support, including LT8609AEMSE16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEMSE16#PBF requirements.
6.How does Aetrix verify that LT8609AEMSE16#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEMSE16#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 LT8609AEMSE16#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AEMSE16#PBF?
All LT8609AEMSE16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEMSE16#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 LT8609AEMSE16#PBF part is unused and in its original packaging.
Return procedure for LT8609AEMSE16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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