My Inquiry
My Account
Analog Devices Inc. LT8609AIMSE#TRPBF
- Part No.:
- LT8609AIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AIMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,727
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609AIMSE#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator in a 10-lead MSOP package with 2.5µA quiescent current in Burst Mode operation, 45ns minimum on-time, and internal compensation for fast transient response - used in automotive infotainment power rails requiring low EMI and wide VIN range.
For engineers reviewing the LT8609AIMSE#TRPBF datasheet, LT8609AIMSE#TRPBF pinout, LT8609AIMSE#TRPBF application, or LT8609AIMSE#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade thermal performance, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LT8609AIMSE#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors (e.g., 2.2µH) and fast load-step response. Its oscillator frequency is set via an external RT resistor (18.2kΩ yields 2MHz), and it supports synchronization or spread-spectrum modulation via the SYNC pin to reduce EMI.
Burst Mode® operation maintains <10mVP-P output ripple while drawing only 2.5µA at no load (12VIN→3.3VOUT). The EN/UV pin features a precise 1.05V rising threshold with 50mV hysteresis, enabling programmable input UVLO or shutdown control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct battery connection in 12V/24V automotive systems without pre-regulation. |
| Max Continuous Output Current | 3A - sustains full load under worst-case thermal conditions (TJ ≤ 125°C) in MSOP package with exposed pad soldered. |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on vehicle modules. |
| Switching Frequency Range | 200kHz to 2.2MHz - adjustable via RT resistor; 2MHz operation allows compact 2.2µH inductors and reduces EMI fundamental frequency. |
| Min On-Time | 45ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse-skipping instability. |
| Feedback Reference Voltage | 0.782V ±0.004V - tight tolerance enables accurate output regulation across temperature (–40°C to 125°C). |
| Power Good Threshold Accuracy | ±8.5% on FB pin - ensures reliable system enable sequencing for downstream processors or sensors. |
Pinout & Package
LT8609AIMSE#TRPBF uses a 10-lead plastic MSOP package (MSE) with exposed thermal pad (Pin 11 = GND), θJA = 40°C/W. The 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 top-FET turn-on robustness. |
| SW | Switch node connecting internal FETs and inductor | High di/dt node; must be minimized in layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading - powers gate drivers and control logic. |
| RT | Oscillator frequency programming | Resistor to GND sets fSW; 18.2kΩ → 2MHz - determines inductor size, efficiency, and EMI profile. |
| SYNC | External clock sync or spread-spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread-spectrum - primary EMI reduction interface. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - enables programmable VIN cutoff or remote shutdown. |
| PG | Open-drain power-good flag | Pulled low until FB within ±8.5%; valid above 3.2V VIN - used for processor reset or system sequencing. |
| TR/SS | Soft-start and output tracking control | 2µA internal pull-up; capacitor sets VOUT ramp rate - prevents inrush current and enables voltage sequencing. |
| FB | Feedback input for adjustable output | Regulated to 0.782V; connects external resistor divider - defines output voltage in non-fixed variants. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) must be soldered to PCB ground plane - essential for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Delivers <10mVP-P ripple at 2.5µA IQ, enabling ultra-low-power always-on systems without compromising regulation stability. |
| Internal Compensation | Eliminates external compensation components - reduces BOM count and layout sensitivity while maintaining phase margin >45°. |
| Spread Spectrum Modulation | Reduces peak EMI by up to 10dB when SYNC is biased at 3.2–5V - meets CISPR 25 Class 5 requirements without shielding. |
| Fast Minimum On-Time (45ns) | Enables single-stage conversion from 42V automotive transients to 3.3V/5V logic rails at 2MHz - avoids cascaded regulators. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C junction temperature - qualified for engine bay and ADAS applications per automotive reliability standards. |
Applications
| Automotive Infotainment Power | GSM Transceiver Supply |
|---|---|
Use Scenario: Powering DSP, display controller, and audio codec in head-unit systems with 12V battery input and cold-crank down to 3.5V. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering 3A continuous current with ultralow IQ during sleep mode. Use Value: Maintains system wake-up readiness over 10+ years on vehicle battery; withstands 42V load-dump transients without derating. | Use Scenario: Supplying RF power amplifier and baseband IC in cellular telematics modules operating across 900/1800/2100MHz bands. IC Role / Device Role / Timing Role: Low-noise, low-EMI 3.3V supply synchronized to baseband clock to avoid mixing spurs. Use Value: Spread-spectrum SYNC operation suppresses conducted EMI in sensitive RF bands; 45ns min-on-time supports dynamic PA bias control. |
| Industrial IoT Sensor Hub | ADAS Camera Module |
Use Scenario: Powering ARM Cortex-M7 MCU, LoRaWAN transceiver, and environmental sensors in battery-backed edge nodes. IC Role / Device Role / Timing Role: High-efficiency 3.3V regulator with soft-start and PG sequencing for firmware-controlled wake-up. Use Value: 2.5µA quiescent current extends 10-year battery life; TR/SS pin enables controlled power-up of analog front-end before digital core. | Use Scenario: Providing clean 1.8V and 3.3V rails to image sensor, ISP, and serializer in rear-view camera systems. IC Role / Device Role / Timing Role: Primary 3.3V buck stage feeding LDOs; operates at 2MHz to avoid AM radio band interference. Use Value: 2MHz switching avoids 530–1710kHz AM band; AEC-Q100 qualification ensures reliability in 105°C ambient environments. |
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 |
|---|---|---|---|
| LT8609EMSE#TRPBF | Same architecture but E-grade (0°C to 125°C junction), higher max IQ (4µA vs 2.5µA), no AEC-Q100 qualification. | Not suitable for automotive under-hood use; acceptable for industrial or consumer applications with lower ambient temps. | Select when cost sensitivity outweighs automotive qualification and extended temperature range. |
| LT8609AEMSE#TRPBF | Fixed 5V output (no FB pin); identical package, quiescent current, and EMI performance; same AEC-Q100 rating. | Eliminates feedback resistors but removes output adjustability - ideal for standardized 5V rail generation. | Choose when system requires fixed 5V output and simplification of feedback network is prioritized. |
Compared with LT8609EMSE#TRPBF, the LT8609AIMSE#TRPBF offers guaranteed –40°C to 125°C operation and automotive qualification, while LT8609AEMSE#TRPBF trades adjustability for reduced component count in fixed-voltage designs - both share identical footprint and thermal behavior.
Availability
LT8609AIMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, GSM transceiver, industrial IoT sensor hub, and ADAS camera module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AIMSE#TRPBF 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 LT8609 family is designed for high-efficiency, low-EMI DC/DC conversion in space-constrained, thermally demanding environments - especially automotive and industrial systems requiring ultralow quiescent current and wide input voltage range.
FAQ
What is the guaranteed operating junction temperature range for LT8609AIMSE#TRPBF?
The LT8609AIMSE#TRPBF is guaranteed for –40°C to 125°C junction temperature operation and is AEC-Q100 qualified for automotive applications. This rating is validated through design, characterization, and statistical process control - ensuring reliability in engine compartment and ADAS deployments where ambient temperatures exceed 105°C.
Does LT8609AIMSE#TRPBF support synchronization to an external clock?
Yes, LT8609AIMSE#TRPBF supports external clock synchronization via its SYNC pin. When driven with a TTL/CMOS-compatible clock (200kHz–2.2MHz), the device aligns its switching edges to the external source and operates in pulse-skipping mode - enabling deterministic EMI reduction and multi-rail timing coordination in complex power systems.
How does the TR/SS pin function in LT8609AIMSE#TRPBF?
The TR/SS pin on LT8609AIMSE#TRPBF provides dual functionality: soft-start control via an internal 2µA pull-up current charging an external capacitor, and output voltage tracking during power-up sequencing. When TR/SS voltage is below 0.782V, the FB pin tracks TR/SS; above that threshold, regulation reverts to the internal reference - enabling controlled ramp-up of multiple rails.
What is the purpose of the BST pin on LT8609AIMSE#TRPBF?
The BST pin on LT8609AIMSE#TRPBF supplies gate drive voltage to the high-side NMOS switch, generated by a bootstrap circuit using an external 0.1µF capacitor between BST and SW. This configuration enables efficient high-side switching without requiring a floating supply - critical for maintaining >93% efficiency at 1A output with 12V input.
Can LT8609AIMSE#TRPBF be used in pulse-skipping mode without external components?
Yes, LT8609AIMSE#TRPBF enters pulse-skipping mode when the SYNC pin is left floating - eliminating need for external clock or resistors. In this mode, the device maintains regulation by skipping switch cycles at light loads, though quiescent current rises to several mA versus 2.5µA in Burst Mode - a trade-off between EMI and standby power.
LT8609AIMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 10-MSOP-EP
LT8609AIMSE#TRPBF FAQ
1.How can I place an order for LT8609AIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AIMSE#TRPBF 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 LT8609AIMSE#TRPBF reliable?
The price and inventory of LT8609AIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AIMSE#TRPBF?
LT8609AIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AIMSE#TRPBF 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 LT8609AIMSE#TRPBF?
For technical support, including LT8609AIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AIMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609AIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AIMSE#TRPBF 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 LT8609AIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AIMSE#TRPBF?
All LT8609AIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AIMSE#TRPBF, 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 LT8609AIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609AIMSE#TRPBF 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…
