My Inquiry
My Account
Analog Devices Inc. LT8609HMSE#PBF
- Part No.:
- LT8609HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,317
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609HMSE#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and peak current mode control. It operates from 3.0V to 42V input, delivers regulated output up to 3A continuous, and supports synchronization or spread-spectrum modulation for low-EMI automotive power systems.
For engineers reviewing the LT8609HMSE#PBF datasheet, LT8609HMSE#PBF pinout, LT8609HMSE#PBF application, or LT8609HMSE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, MSOP-10 package with exposed thermal pad, fixed-frequency or pulse-skipping operation, and precise 0.782V feedback reference with ±8.5% power-good accuracy.
Technical Context
The LT8609HMSE#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors. Its oscillator frequency is resistor-programmable from 200kHz to 2.2MHz via the RT pin, and it features integrated top/bottom NMOS power switches with 185mΩ/115mΩ on-resistances.
Burst Mode operation maintains ultralow 2.5µA input quiescent current at no load while holding output ripple below 10mVP-P; the EN/UV pin provides accurate 1.05V enable threshold with 50mV hysteresis, and the PG pin signals output regulation status with ±8.5% tolerance on FB voltage for adjustable-output variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide-range industrial and automotive battery inputs including cold-crank conditions. |
| Continuous Output Current | 3A - sufficient for powering microcontrollers, sensors, and communication ICs in compact systems. |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN→3.3VOUT - enables always-on functionality in battery-powered applications with multi-year standby life. |
| Minimum On-Time | 45ns - allows high step-down ratios (e.g., 42V→3.3V) at 2MHz switching without pulse skipping. |
| Feedback Reference Voltage | 0.782V ±0.004V - precision reference enabling accurate output regulation across temperature and line variations. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive environments and high-reliability industrial use. |
| Switching Frequency Range | 200kHz to 2.2MHz - programmable via RT resistor to optimize efficiency, size, and EMI performance. |
Pinout & Package
LT8609HMSE#PBF uses a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND), θJA = 40°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 gate driver | Requires 0.1µF ceramic capacitor to SW; enables efficient high-side NMOS switching above VIN. |
| SW | Switch node | Connects to inductor and BST capacitor; critical high-dv/dt node requiring minimized PCB area and tight layout. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor; powers internal logic and gate drivers. |
| RT | Oscillator frequency programming | Resistor to GND sets switching frequency from 200kHz to 2.2MHz; determines inductor size and EMI profile. |
| SYNC | External clock sync / spread-spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2–5.0V for spread-spectrum; not present on LT8609B variant. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO via external resistor divider. |
| PG | Power good open-drain flag | Pulls low until FB reaches ±8.5% of 0.782V reference; valid when VIN > 3.2V regardless of EN state. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; supports output voltage tracking during sequencing. |
| FB | Feedback input for adjustable output | Regulated to 0.782V; connects external resistor divider to set output voltage; used only on adjustable versions. |
| VIN | Main input supply | Supplies internal circuitry and high-side switch; requires local high-frequency bypass capacitor near pin. |
| GND | Power and signal ground | Exposed pad (Pin 11) must be soldered to PCB ground plane for thermal dissipation and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery life in always-on automotive modules. |
| 45ns Minimum On-Time | Enables 42V-to-3.3V conversion at 2MHz without duty-cycle limitation or forced pulse skipping. |
| Integrated Power Switches | 185mΩ top / 115mΩ bottom NMOS reduce conduction loss and eliminate external MOSFET selection. |
| Spread-Spectrum Modulation | Reduces peak EMI by ±10% frequency dithering when SYNC is biased at 3.2–5.0V. |
| Accurate Power-Good Flag | PG asserts within ±8.5% of target output voltage, supporting reliable system power sequencing. |
| Internal Compensation | Eliminates external compensation network, simplifying design and improving stability across operating conditions. |
Applications
| Automotive Infotainment Power | GSM Transceiver Supply |
|---|---|
Use Scenario: Powering DSPs, display controllers, and audio codecs in head units with 12V/24V battery input and strict quiescent current limits. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator delivering 3A continuous current with <2.5µA standby IQ. Use Value: Enables compliance with ISO 16750-2 cold-crank requirements and extends battery runtime during vehicle sleep modes. | Use Scenario: Providing clean, low-noise 3.3V supply to cellular modem RF sections in telematics control units. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with spread-spectrum EMI reduction and fast transient response. Use Value: Meets CISPR 25 Class 5 radiated emissions limits without added shielding or filtering components. |
| Industrial Sensor Hub | Portable Medical Device |
Use Scenario: Regulating power for multi-sensor nodes (temperature, pressure, IMU) in battery-operated condition monitoring systems. IC Role / Device Role / Timing Role: Compact 3A buck regulator with 45ns min-on-time supporting wide VIN range and precise output accuracy. Use Value: Allows single-stage conversion from 24V field bus to 3.3V logic rails, reducing BOM count and board space. | Use Scenario: Supplying critical subsystems (MCU, ADC, wireless transceiver) in handheld diagnostic tools with Li-ion battery input. IC Role / Device Role / Timing Role: Low-IQ synchronous buck converter with soft-start and power-good signaling for safe system boot. Use Value: Ensures reliable startup and brown-out protection while extending usable battery life between charges. |
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#PBF | Same architecture and pinout; rated for –40°C to 125°C junction temperature (vs. 150°C for LT8609HMSE#PBF). | Suitable for non-under-hood industrial or consumer applications where extended temperature is not required. | Select when full AEC-Q100 H-grade thermal margin is unnecessary and cost optimization is prioritized. |
| LT8609AEMSE#PBF | Same functional spec; E-grade rated for –40°C to 125°C; lower production test coverage than H-grade. | Appropriate for commercial-grade designs with less stringent reliability or lifetime requirements. | Choose for prototyping or cost-sensitive volume production where 150°C operation is not mandated. |
Compared with LT8609AIMSE#PBF and LT8609AEMSE#PBF, the LT8609HMSE#PBF provides guaranteed operation up to 150°C junction temperature with enhanced process screening-critical for automotive under-hood placement and long-term reliability in thermally stressed environments.
Availability
LT8609HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, GSM transceiver power supplies, and industrial sensor hubs requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8609HMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8609 series belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency DC/DC regulators, designed specifically for demanding automotive and industrial applications requiring ultralow quiescent current, wide input range, and robust thermal performance.
FAQ
What is the maximum junction temperature rating for LT8609HMSE#PBF?
The LT8609HMSE#PBF is guaranteed to operate over a junction temperature range of –40°C to 150°C, making it suitable for under-hood automotive applications and high-ambient industrial environments where thermal stress is significant. This rating is validated per AEC-Q100 Grade 1 requirements and supported by enhanced process screening and testing.
Does LT8609HMSE#PBF support synchronization to an external clock?
Yes, the LT8609HMSE#PBF supports external clock synchronization via its SYNC pin. When driven with a TTL/CMOS-compatible clock signal, the device aligns its switching edges to the external source and operates in pulse-skipping mode. This capability enables deterministic EMI reduction and timing coordination in multi-rail power systems.
How does the LT8609HMSE#PBF achieve 2.5µA quiescent current?
The LT8609HMSE#PBF achieves 2.5µA input quiescent current through Burst Mode® operation: during light loads, it delivers short energy bursts to maintain output regulation, then shuts down most internal circuitry-including the oscillator and gate drivers-during extended sleep periods. This architecture minimizes static power consumption while keeping output ripple below 10mVP-P.
What package type and thermal characteristics does LT8609HMSE#PBF use?
The LT8609HMSE#PBF uses a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND), offering θJA = 40°C/W. The exposed pad must be soldered to a PCB ground plane to ensure effective heat dissipation and meet the 150°C junction temperature specification under full 3A load conditions.
Is LT8609HMSE#PBF pin-compatible with other variants in the LT8609 family?
Yes, the LT8609HMSE#PBF shares identical pinout and footprint with all LT8609/LT8609A variants in the 10-lead MSOP package, including LT8609EMSE#PBF, LT8609IMSE#PBF, and LT8609AIMSE#PBF. This allows direct substitution across temperature grades without PCB redesign, provided system-level thermal and reliability requirements are verified.
LT8609HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (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:
- 10-MSOP-EP
LT8609HMSE#PBF FAQ
1.How can I place an order for LT8609HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609HMSE#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 LT8609HMSE#PBF reliable?
The price and inventory of LT8609HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609HMSE#PBF?
LT8609HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609HMSE#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 LT8609HMSE#PBF?
For technical support, including LT8609HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609HMSE#PBF requirements.
6.How does Aetrix verify that LT8609HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609HMSE#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 LT8609HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609HMSE#PBF?
All LT8609HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609HMSE#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 LT8609HMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609HMSE#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…
