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Analog Devices Inc. LT8609BIMSE#TRPBF
- Part No.:
- LT8609BIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609BIMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,335
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Product details
Overview
LT8609BIMSE#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator operating in pulse-skipping mode only, with 2.5µA quiescent current at 12VIN→3.3VOUT, 45ns minimum on-time, and internal compensation for fast transient response. It delivers stable 3A continuous output in automotive and industrial power rails requiring low EMI and wide input range.
For engineers reviewing the LT8609BIMSE#TRPBF datasheet, LT8609BIMSE#TRPBF pinout, LT8609BIMSE#TRPBF application, or LT8609BIMSE#TRPBF equivalent, key selection criteria include its fixed pulse-skipping operation (no Burst Mode), absence of SYNC pin, ±8.5% power-good accuracy on FB, 0.772–0.792V feedback reference, and 10-lead MSOP package with exposed GND pad.
Technical Context
The LT8609B employs peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its oscillator is factory-set to operate at 2.00MHz (typ) with RT = 18.2kΩ, and it lacks spread spectrum or external synchronization capability due to the NC SYNC pin.
Unlike LT8609/LT8609A variants, the LT8609B omits Burst Mode and uses pulse-skipping exclusively-resulting in higher light-load IQ (several mA vs. 2.5µA) but eliminating low-frequency ripple. Its EN/UV pin has 1.05V rising threshold and 50mV hysteresis, and PG asserts when FB deviates >±8.5% from regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive battery rails and industrial 36V systems without pre-regulation. |
| Output Current | 3A continuous - sustains full load under thermal limits in 10-lead MSOP with θJA = 40°C/W. |
| Quiescent Current | 350µA (typ) at VEN/UV = 2V, non-switching - enables always-on subsystems with minimal standby drain. |
| Feedback Reference | 0.772V to 0.792V (min/max over temp) - sets output voltage via external resistor divider with ±1.3% initial tolerance impact. |
| Switching Frequency | 1.875–2.125MHz (min/max) - enables use of ≤2.2µH inductors and reduces EMI fundamental frequency above AM band. |
| Min On-Time | 45ns - allows high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping at heavy loads. |
| Power-Good Accuracy | ±8.5% on FB pin - provides reliable enable signaling for downstream logic or sequencing controllers. |
Pinout & Package
LT8609BIMSE#TRPBF is housed in a 10-lead plastic MSOP package (MSE) with exposed GND pad (Pin 11), requiring soldering to PCB for thermal and electrical integrity. θJA = 40°C/W.
| 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 yields 2.00MHz - determines inductor size and EMI profile. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - enables VIN-programmable UVLO using external divider. |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor; feeds internal circuitry and top-FET source. |
| PG | Open-drain power-good flag | Pulls low if FB deviates >±8.5% or fault occurs; valid when VIN > 3.2V - used for system sequencing. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed ramp rate; pulled low during fault - prevents inrush current. |
| FB | Feedback input for adjustable output regulation | Regulated to 0.782V (typ); connects external resistor divider - defines output voltage precision and stability. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) must be soldered to PCB ground plane - essential for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping only operation | Eliminates Burst Mode artifacts (low-frequency ripple) while maintaining high efficiency across medium-to-heavy loads. |
| No SYNC pin (NC) | Removes external clock dependency and spread spectrum configuration complexity - simplifies layout and EMI tuning. |
| 45ns minimum on-time | Enables direct 42V-to-3.3V conversion at 2MHz without duty-cycle limitation or need for pre-regulators. |
| Internal compensation | Reduces external component count by eliminating loop compensation network - accelerates design cycle and improves consistency. |
| AEC-Q100 qualified | Rated for automotive junction temperatures up to 125°C - validated for engine control, ADAS, and infotainment power supplies. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering FPGA core voltage (1.2V) and DDR memory (1.5V/1.8V) from 12V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering clean, sequenced 3A output with PG signaling for safe power-up. Use Value: 42V max input withstands load-dump transients; 2.5µA IQ preserves battery during parking mode; PG ensures deterministic FPGA configuration timing. | Use Scenario: Generating isolated 5V/3.3V rails for analog sensor front-ends and microcontroller peripherals in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter supplying regulated power to mixed-signal circuits with tight noise budgets. Use Value: 2MHz switching avoids sensitive 10kHz–1MHz measurement bands; internal compensation ensures stability with low-ESR polymer capacitors. |
| Portable Medical Instrument | Telecom Remote Radio Unit |
Use Scenario: Battery-powered ultrasound probe requiring ultra-low standby current and fast wake-up response from sleep state. IC Role / Device Role / Timing Role: Always-on power management IC providing regulated 3.3V rail with soft-start and precise power-good assertion. Use Value: 350µA non-switching IQ extends battery life; TR/SS pin enables controlled voltage ramp to prevent sensor bias disruption during wake-up. | Use Scenario: Powering RF power amplifiers and ADC/DAC stages in outdoor 4G/5G base station radios exposed to wide temperature swings. IC Role / Device Role / Timing Role: Robust, high-current buck converter operating reliably from –40°C to +125°C junction temperature. Use Value: AEC-Q100 qualification ensures reliability under thermal cycling; 45ns min on-time supports 48V-to-5V conversion at 2MHz for compact heatsinkless design. |
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 |
|---|---|---|---|
| LT8609AIMSE#TRPBF | Includes SYNC pin for Burst Mode or spread spectrum; 1.7µA IQ in Burst Mode vs. LT8609B's 350µA pulse-skipping IQ. | Preferred where ultralow standby power (<5µA) is mandatory and low-frequency ripple is acceptable. | Select LT8609AIMSE#TRPBF if system requires lowest possible quiescent current and can tolerate Burst Mode ripple. |
| LT8609BEMSE#TRPBF | Same functionality and pinout, but rated for –40°C to 125°C (E-grade) instead of I-grade; identical electrical specs. | Suitable for commercial/industrial environments without extended temperature validation requirements. | Choose LT8609BEMSE#TRPBF for cost-sensitive designs where automotive-grade temperature assurance is unnecessary. |
Compared with LT8609AIMSE#TRPBF, the LT8609BIMSE#TRPBF trades ultralow IQ for ripple-free pulse-skipping operation and removes SYNC complexity; versus LT8609BEMSE#TRPBF, it offers guaranteed performance across the full industrial temperature range with tighter parametric limits.
Availability
LT8609BIMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, portable medical instruments, and telecom remote radio units requiring stable component supply, AEC-Q100 compliance, and high-reliability 3A power conversion.
Supply support for LT8609BIMSE#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, industrial automation, communications, and automotive markets.
The LT8609 family is designed for high-efficiency, low-EMI, wide-input synchronous buck conversion in space-constrained and thermally demanding applications - with the LT8609B variant optimized for pulse-skipping simplicity and automotive-grade reliability.
FAQ
What is the function of the SYNC pin on LT8609BIMSE#TRPBF?
The SYNC pin on LT8609BIMSE#TRPBF is a no-connect (NC) terminal. Unlike LT8609/LT8609A variants, the LT8609B operates exclusively in pulse-skipping mode without external synchronization or spread spectrum capability. This simplifies layout and eliminates clock routing concerns, making LT8609BIMSE#TRPBF ideal for designs prioritizing EMI predictability over ultralow IQ.
Does LT8609BIMSE#TRPBF support adjustable output voltage?
Yes, LT8609BIMSE#TRPBF supports adjustable output voltage via the FB pin, which regulates to 0.782V (typ). An external resistor divider between VOUT, FB, and GND sets the output voltage. It does not support fixed-output variants (e.g., LT8609A-3.3); those are separate part numbers. The LT8609BIMSE#TRPBF datasheet specifies FB reference tolerance of 0.772V to 0.792V over temperature.
What is the maximum continuous output current of LT8609BIMSE#TRPBF?
The LT8609BIMSE#TRPBF delivers 3A of continuous output current under thermal limits defined by its 10-lead MSOP package (θJA = 40°C/W) and ambient conditions. This rating assumes proper PCB copper area for the exposed GND pad, adequate input/output capacitance, and 2.2µH inductor. Peak current limit is 3.4–5.7A (min–max), ensuring robust overload protection.
How does LT8609BIMSE#TRPBF differ from LT8609AIMSE#TRPBF in terms of quiescent current?
LT8609BIMSE#TRPBF draws 350µA (typ) quiescent current when enabled but not switching, whereas LT8609AIMSE#TRPBF achieves 1.7µA in Burst Mode. The LT8609BIMSE#TRPBF uses pulse-skipping only - resulting in higher light-load IQ but eliminating low-frequency output ripple. This makes LT8609BIMSE#TRPBF preferable in noise-sensitive applications where ripple amplitude matters more than standby current.
Is LT8609BIMSE#TRPBF qualified for automotive applications?
Yes, LT8609BIMSE#TRPBF is AEC-Q100 qualified for automotive applications, rated for operation from –40°C to +125°C junction temperature (I-grade). It meets stress test requirements for temperature cycling, humidity, and mechanical shock, and is intended for use in infotainment, body electronics, and ADAS subsystems where reliability under harsh environmental conditions is critical.
LT8609BIMSE#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
LT8609BIMSE#TRPBF FAQ
1.How can I place an order for LT8609BIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609BIMSE#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 LT8609BIMSE#TRPBF reliable?
The price and inventory of LT8609BIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609BIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609BIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609BIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609BIMSE#TRPBF?
LT8609BIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609BIMSE#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 LT8609BIMSE#TRPBF?
For technical support, including LT8609BIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609BIMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609BIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609BIMSE#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 LT8609BIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609BIMSE#TRPBF?
All LT8609BIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609BIMSE#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 LT8609BIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609BIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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