My Inquiry
My Account
Analog Devices Inc. LT8609BEMSE#TRPBF
- Part No.:
- LT8609BEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609BEMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,590
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609BEMSE#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 LT8609BEMSE#TRPBF datasheet, LT8609BEMSE#TRPBF pinout, LT8609BEMSE#TRPBF application, or LT8609BEMSE#TRPBF equivalent, key selection criteria include its fixed pulse-skipping operation (no Burst Mode), absence of SYNC pin, ±8.5% PG threshold tolerance, 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 no external synchronization capability.
Unlike LT8609/LT8609A variants, the LT8609B omits the SYNC pin and operates exclusively in pulse-skipping mode-resulting in higher light-load IQ (several mA) but eliminating spread spectrum modulation and external clock sync. 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 and industrial bus inputs without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and communication ICs from single-stage conversion. |
| Quiescent Current | 350µA (typ) at VIN=2V, non-switching - enables always-on systems with battery life optimization. |
| Feedback Reference | 0.772–0.792V - sets output voltage via external resistor divider; enables adjustable outputs from 0.782V × (1+R1/R2). |
| Switching Frequency | 1.875–2.125MHz (typ 2.00MHz) - allows use of compact 2.2µH inductors and reduces output capacitor size. |
| Min On-Time | 45ns - supports high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse skipping at heavy loads. |
| PG Threshold Accuracy | ±8.5% on FB - provides reliable power-good signaling for downstream logic sequencing and fault detection. |
Pinout & Package
LT8609BEMSE#TRPBF is housed in 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 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; enables efficient high-side switch operation above VIN. |
| SW | Switch node connecting internal power FETs to inductor | High dv/dt node; must be minimized in layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor to GND; powers internal logic and drivers. |
| RT | Oscillator frequency programming | Resistor to GND sets switching frequency; 18.2kΩ yields 2.00MHz typical. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; enables VIN-based UVLO programming or shutdown control. |
| VIN | Main input power supply | Supplies internal circuitry and top FET; requires local high-frequency input capacitor (e.g., 10µF X7R + 1µF X5R). |
| PG | Open-drain power-good flag | Pulls low when FB is outside ±8.5% of 0.782V or during fault; valid above VIN = 3.2V. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed VOUT ramp rate; pulled low during fault/shutdown. |
| FB | Feedback input for adjustable output regulation | Regulated to 0.772–0.792V; connects to resistor divider tap for output voltage setting. |
| GND | Power and signal ground reference | Exposed pad (Pin 11); must be soldered to large PCB copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping only operation | Eliminates Burst Mode complexity and associated low-frequency ripple; simplifies EMI filtering for fixed-frequency-sensitive applications. |
| No SYNC pin | Reduces external component count and PCB routing; removes risk of sync source instability or mismatch-induced jitter. |
| 45ns minimum on-time | Enables direct 42V-to-3.3V conversion at 2MHz without duty-cycle limitation or need for pre-regulator stages. |
| Internal compensation | Removes need for external compensation network; shortens design cycle and improves consistency across production units. |
| AEC-Q100 qualified (E-grade) | Validated for automotive ambient temperature range (–40°C to +125°C junction), supporting under-hood and infotainment power rails. |
Applications
| Automotive Body Control Module (BCM) | Industrial IoT Sensor Node |
|---|---|
Use Scenario: Powering CAN transceiver, microcontroller, and LIN interface from 12V battery rail with cold-crank tolerance down to 3V. IC Role / Device Role / Timing Role: Primary 3.3V/3A buck regulator providing clean, regulated supply with ultralow quiescent current during sleep modes. Use Value: Maintains <350µA non-switching IQ to extend battery life in parked state while delivering full 3A during active CAN messaging bursts. | Use Scenario: Converting 24V industrial bus to 3.3V for ultra-low-power wireless sensor MCU and RF front-end in predictive maintenance edge device. IC Role / Device Role / Timing Role: High-efficiency, wide-input DC/DC converter enabling direct connection to 24V PLC or fieldbus without intermediate regulators. Use Value: 2MHz switching and 45ns min-on-time allow compact 2.2µH inductor and 22µF output capacitance, reducing board footprint by >30% vs lower-frequency alternatives. |
| Low-EMI Industrial Camera Power | Rail Splitter for Precision ADC Bias |
Use Scenario: Supplying image sensor and FPGA core voltage in machine vision camera where conducted EMI must meet CISPR-22 Class B limits. IC Role / Device Role / Timing Role: Pulse-skipping buck regulator minimizing low-frequency switching artifacts that interfere with analog video signal integrity. Use Value: Absence of Burst Mode eliminates sub-100kHz ripple components, simplifying compliance testing and eliminating need for additional LC filters. | Use Scenario: Generating precision ±1.65V rails from 3.3V supply for 16-bit SAR ADC reference and bias networks in test equipment. IC Role / Device Role / Timing Role: Adjustable buck regulator configured as negative LDO via inverting charge-pump assist, leveraging accurate 0.772–0.792V FB reference. Use Value: Tight 0.782V reference tolerance (±0.01V) ensures <0.3% output error before trimming, critical for 16-bit ADC full-scale accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609EMSE#TRPBF | Includes SYNC pin; supports Burst Mode (1.7µA IQ) and external clock sync; slower switch edges than LT8609B. | Preferred where lowest standby IQ or EMI-controlled sync is required; not drop-in due to SYNC pin presence and different timing behavior. | Select LT8609EMSE#TRPBF if system requires <2.5µA quiescent current or spread-spectrum EMI reduction. |
| LT8609AIMSE#TRPBF | Same pinout and pulse-skipping/Burst Mode dual capability; rated for –40°C to 125°C (I-grade), tighter FB tolerance (0.770–0.786V). | Drop-in replacement for extended temperature reliability; identical functionality but improved reference accuracy and thermal rating. | Choose LT8609AIMSE#TRPBF for industrial applications needing guaranteed performance over full –40°C to 125°C range. |
Compared with LT8609EMSE#TRPBF, the LT8609BEMSE#TRPBF trades ultralow IQ and EMI flexibility for simplified layout and deterministic pulse-skipping behavior; versus LT8609AIMSE#TRPBF, it offers identical function but with E-grade temperature validation and slightly relaxed FB tolerance.
Availability
LT8609BEMSE#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial IoT sensor nodes, low-EMI camera power supplies, and precision ADC bias rails requiring stable component supply with AEC-Q100 qualification and 10-year longevity assurance.
Supply support for LT8609BEMSE#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, and automotive markets since 1965.
The LT8609 family is designed for high-efficiency, wide-input DC/DC conversion in space-constrained and thermally demanding environments, emphasizing ultralow IQ, fast transient response, and robust EMI performance.
FAQ
What is the quiescent current specification for LT8609BEMSE#TRPBF under no-load regulation?
The LT8609BEMSE#TRPBF draws 350µA (typical) from VIN when EN/UV = 2V and not switching - significantly higher than the 1.7µA of LT8609/LT8609A in Burst Mode, reflecting its pulse-skipping-only architecture. This value is confirmed in the Electrical Characteristics table under "VIN Current in Regulation" for LT8609B.
Does LT8609BEMSE#TRPBF support external frequency synchronization?
No, the LT8609BEMSE#TRPBF does not support external synchronization. Its SYNC pin is replaced with a no-connect (NC), and the device operates exclusively in pulse-skipping mode. This is explicitly stated in the Pin Functions section: "In the LT8609B, the SYNC pin is replaced with a no connect; the LT8609B operates in pulse-skipping mode without spread spectrum."
What is the feedback reference voltage range for LT8609BEMSE#TRPBF?
The LT8609BEMSE#TRPBF regulates the FB pin to a reference voltage of 0.772V (min) to 0.792V (max) across temperature and load, as specified in the Electrical Characteristics table under "Feedback Reference Voltage" for LT8609B. This defines the accuracy of output voltage setting when using an external resistor divider.
How does the power-good (PG) flag behave on LT8609BEMSE#TRPBF?
The PG pin on LT8609BEMSE#TRPBF is an open-drain output that remains low until the FB voltage reaches within ±8.5% of the 0.782V regulation point and no fault conditions exist. PG becomes valid when VIN exceeds 3.2V, independent of EN/UV state - enabling early power sequencing even before enable assertion.
What package type and thermal characteristics apply to LT8609BEMSE#TRPBF?
LT8609BEMSE#TRPBF uses a 10-lead plastic MSOP package (MSE) with exposed thermal pad (Pin 11 = GND), specified with θJA = 40°C/W. The exposed pad must be soldered to PCB ground for effective thermal dissipation and noise control, as emphasized in both the Pin Configuration and Absolute Maximum Ratings sections.
LT8609BEMSE#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
LT8609BEMSE#TRPBF FAQ
1.How can I place an order for LT8609BEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609BEMSE#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 LT8609BEMSE#TRPBF reliable?
The price and inventory of LT8609BEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609BEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609BEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609BEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609BEMSE#TRPBF?
LT8609BEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609BEMSE#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 LT8609BEMSE#TRPBF?
For technical support, including LT8609BEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609BEMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609BEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609BEMSE#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 LT8609BEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609BEMSE#TRPBF?
All LT8609BEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609BEMSE#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 LT8609BEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609BEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609BEMSE#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…
