My Inquiry
My Account
Analog Devices Inc. LT8609AHMSE16#PBF
- Part No.:
- LT8609AHMSE16#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AHMSE16#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:307
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609AHMSE16#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 operates from 3.0V to 42V input, delivers up to 3A continuous current, supports 200kHz–2.2MHz switching (adjustable via RT pin), and features spread spectrum modulation for low EMI - ideal for automotive infotainment power rails.
For engineers reviewing the LT8609AHMSE16#PBF datasheet, LT8609AHMSE16#PBF pinout, LT8609AHMSE16#PBF application, or LT8609AHMSE16#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 16-lead MSOP package with exposed thermal pad, ±7.5% power-good accuracy on fixed 5V output, and compatibility with small inductors due to fast 45ns minimum on-time.
Technical Context
The LT8609AHMSE16#PBF implements peak current mode control with internal compensation, enabling stable operation with minimal external components and fast transient response. Its oscillator frequency is set by an external resistor on the RT pin and ranges from 200kHz to 2.2MHz - confirmed at 2.00MHz typical with 18.2kΩ.
Burst Mode operation maintains ultralow 2.5µA input quiescent current at light loads while holding output ripple below 10mVP-P; spread spectrum modulation (enabled when SYNC is tied to 3.2–5.0V) reduces EMI without sacrificing regulation accuracy. The part uses separate top and bottom NMOS power switches with 185mΩ and 115mΩ on-resistances, respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial 24V/36V systems without pre-regulation. |
| Output Voltage | Fixed 5.00V ±2% - internally trimmed; no external feedback resistors required. |
| Max Continuous Output Current | 3A - sustained delivery with thermal management via exposed GND pad in 16-lead MSOP. |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN→5VOUT - enables always-on subsystems with multi-year battery life. |
| Switching Frequency Range | 200kHz to 2.2MHz - adjustable via RT pin; 2.00MHz typical with 18.2kΩ resistor. |
| Output Ripple | <10mVP-P in Burst Mode - meets stringent noise requirements for RF and sensor power domains. |
| Power-Good Accuracy | ±7.5% on VOUT - PG flag asserts when 5V output is within 4.625V–5.375V, enabling reliable system sequencing. |
Pinout & Package
LT8609AHMSE16#PBF is housed in a 16-lead plastic MSOP package with exposed thermal 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 |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; critical for proper top-FET turn-on above VIN. |
| SW | Switch node | Connects to inductor and BST capacitor; high dv/dt node requiring minimized PCB area for EMI control. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic; powers internal logic and gate drivers. |
| RT | Frequency setting resistor connection | Resistor to GND sets oscillator frequency; 18.2kΩ yields 2.00MHz typical. |
| SYNC | External clock synchronization input | Accepts 0–5V logic; enables pulse-skipping, spread spectrum, or external sync - not NC (unlike LT8609B). |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold; hysteresis = 50mV; allows programmable VIN UVLO using resistor divider. |
| VIN | Main input power supply | Supplies internal circuitry and top-FET; requires local high-frequency bypass capacitor. |
| PG | Open-drain power-good flag | Pulls low until VOUT reaches ±7.5% of 5V (4.625–5.375V); valid above 3.2V VIN regardless of EN state. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up; capacitor here programs output ramp rate; supports voltage tracking during sequencing. |
| FB | Feedback input (not used) | No connection - LT8609AHMSE16#PBF is fixed-output; FB pin is unused and must be left floating. |
| VOUT | Regulated 5V output | Internally connected to 5V reference; provides regulated output and serves as PG sense point. |
| GND | Power and signal ground | Exposed pad (Pin 17) is GND - must be soldered to PCB plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications across –40°C to +150°C junction temperature (H-grade). |
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery life in always-on vehicle modules. |
| Spread spectrum modulation | Reduces peak EMI by spreading switching energy over 1–6kHz band - simplifies EMC compliance. |
| Fast 45ns minimum on-time | Enables high step-down ratios (e.g., 42V→5V) at 2MHz without pulse skipping or instability. |
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Accurate 5V fixed output | ±2% initial accuracy and ±0.2% line/load regulation - eliminates trimming and improves system-level tolerance stackup. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Powering USB host controllers, display interfaces, and audio codecs in head units with cold-crank (4.5V) and load-dump (42V) resilience. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A with ultralow IQ to maintain CAN bus wake-up capability during sleep. Use Value: 2.5µA quiescent current prevents battery drain over weeks; AEC-Q100 qualification ensures reliability across temperature extremes. | Use Scenario: Generating clean 5V rail for microcontroller, isolated RS-485 transceivers, and analog sensor front-ends in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage replacing linear regulators to reduce heat and improve power density. Use Value: <10mVP-P ripple avoids ADC noise coupling; 42V max input accommodates unregulated 24V industrial supplies with margin. |
| Telematics Control Unit (TCU) | Smart Rearview Mirror System |
Use Scenario: Supplying LTE modem, GNSS receiver, and eSIM interface under stop-start engine conditions with wide VIN transients. IC Role / Device Role / Timing Role: Main 5V system rail with PG signaling for safe boot sequencing and fault detection during brownouts. Use Value: ±7.5% PG accuracy ensures deterministic reset timing; spread spectrum lowers radiated emissions near cellular antennas. | Use Scenario: Powering image sensor, display driver, and gesture recognition SoC in rearview mirrors with ambient temperature range –40°C to +85°C. IC Role / Device Role / Timing Role: Fixed-output buck regulator with TR/SS-controlled soft-start to prevent inrush into capacitive LCD loads. Use Value: 45ns min on-time enables 2MHz operation with small 2.2µH inductor - saves board space and cost. |
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 |
|---|---|---|---|
| LT8609AIMSE16#PBF | I-grade (–40°C to +125°C), same pinout and electrical specs except junction temp rating. | Not qualified for under-hood automotive use; suitable for industrial or consumer applications with lower ambient temps. | Select when AEC-Q100 and 150°C operation are unnecessary - lower cost and broader distributor availability. |
| LT8609AJMSE16#PBF | J-grade with tighter FB reference tolerance (0.766–0.798V vs H-grade 0.766–0.794V), otherwise identical. | Same automotive qualification; preferred where tighter output voltage accuracy is required across full temperature range. | Choose for high-precision 5V rails where ±2% initial accuracy must be maintained over –40°C to +150°C. |
Compared with LT8609AIMSE16#PBF, the LT8609AHMSE16#PBF adds AEC-Q100 qualification and extended 150°C operation for under-hood placement; versus LT8609AJMSE16#PBF, it trades minor FB tolerance for broader production availability and cost efficiency in volume automotive programs.
Availability
LT8609AHMSE16#PBF is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8609AHMSE16#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 LT8609 family is designed for high-efficiency, low-EMI, wide-input synchronous buck conversion in space-constrained and thermally demanding environments - especially automotive and industrial edge nodes.
FAQ
What is the maximum operating junction temperature for LT8609AHMSE16#PBF?
The LT8609AHMSE16#PBF is rated for operation up to +150°C junction temperature and is guaranteed across the full –40°C to +150°C range. This H-grade qualification enables placement in high-temperature automotive locations such as engine compartments or near power inverters, supported by its 40°C/W θJA and low-power design.
Does LT8609AHMSE16#PBF require external feedback resistors for its 5V output?
No, LT8609AHMSE16#PBF does not require external feedback resistors. It is a fixed 5V output variant with an internal resistor divider connected to the VOUT pin. The FB pin is unused and must remain floating - unlike adjustable versions that require external R1/R2 networks.
How is spread spectrum modulation enabled on LT8609AHMSE16#PBF?
Spread spectrum modulation on LT8609AHMSE16#PBF is enabled by connecting the SYNC pin to a voltage between 3.2V and 5.0V (e.g., INTVCC). This causes the internal oscillator to dither frequency between 1–6kHz, reducing peak EMI without affecting regulation accuracy or output ripple.
What is the purpose of the TR/SS pin on LT8609AHMSE16#PBF?
The TR/SS pin on LT8609AHMSE16#PBF controls soft-start ramp rate and enables output voltage tracking. With a capacitor connected, it programs the 5V output slew rate; when driven externally, it allows synchronized startup with other rails (e.g., 3.3V or 1.2V) using a scaling factor of 6.39×.
Is LT8609AHMSE16#PBF pin-compatible with LT8609AIMSE16#PBF?
Yes, LT8609AHMSE16#PBF is pin-compatible with LT8609AIMSE16#PBF - both use the same 16-lead MSOP package with identical pinout, footprint, and electrical interface. The only differences are temperature grade (H vs I) and AEC-Q100 qualification, making them drop-in replacements where thermal and automotive requirements align.
LT8609AHMSE16#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8609AHMSE16#PBF FAQ
1.How can I place an order for LT8609AHMSE16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHMSE16#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 LT8609AHMSE16#PBF reliable?
The price and inventory of LT8609AHMSE16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHMSE16#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AHMSE16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHMSE16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHMSE16#PBF?
LT8609AHMSE16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHMSE16#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 LT8609AHMSE16#PBF?
For technical support, including LT8609AHMSE16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHMSE16#PBF requirements.
6.How does Aetrix verify that LT8609AHMSE16#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHMSE16#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 LT8609AHMSE16#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AHMSE16#PBF?
All LT8609AHMSE16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHMSE16#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 LT8609AHMSE16#PBF part is unused and in its original packaging.
Return procedure for LT8609AHMSE16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609AHMSE16#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
