My Inquiry
My Account
Analog Devices Inc. LT8609AHMSE#PBF
- Part No.:
- LT8609AHMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AHMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:234
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609AHMSE#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 10-lead MSOP package rated for –40°C to 150°C junction temperature. It delivers regulated 5V output (fixed), supports external synchronization or spread-spectrum modulation, and targets automotive power rails requiring low EMI and high efficiency at light loads.
For engineers reviewing the LT8609AHMSE#PBF datasheet, LT8609AHMSE#PBF pinout, LT8609AHMSE#PBF application, or LT8609AHMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 5V fixed output accuracy (±7.5% PG threshold), 45ns minimum on-time, 2MHz switching capability with RT resistor programming, and compatibility with small inductors due to fast transient response.
Technical Context
The LT8609AHMSE#PBF implements peak current mode control with internal 0.782V reference and frequency set via RT pin (200kHz–2.2MHz). Its architecture integrates top/bottom NMOS power switches (185mΩ/115mΩ), 3.5V INTVCC regulator, and burst-mode logic that disables switching circuitry between pulses to achieve ultralow IQ.
Burst Mode operation maintains output ripple below 10mVP-P while regulating at no load, and the SYNC pin enables external clock synchronization or spread-spectrum modulation for EMI reduction. The EN/UV pin features accurate 1.05V rising threshold with 50mV hysteresis for programmable input UVLO or shutdown control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Output Voltage | Fixed 5V ±11mV (typical) - internally trimmed; PG asserts when VOUT is within ±7.5% of 5V. |
| Continuous Output Current | 3A - sustained delivery without thermal derating up to 150°C junction temperature. |
| Quiescent Current | 2.5µA at 12VIN→5VOUT no-load - enables always-on systems with multi-year battery life. |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq). |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V) at 2MHz without pulse-skipping instability. |
| Package | 10-Lead MSOP with exposed pad - θJA = 40°C/W; requires soldered GND pad for thermal and EMI performance. |
Pinout & Package
LT8609AHMSE#PBF uses a 10-lead plastic MSOP package (MSE) with exposed thermal pad (Pin 11 = GND). The package measures 3mm × 3mm × 1.1mm and requires PCB soldering of the exposed pad for thermal management and low-impedance ground return.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply | Drives top NMOS gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| SW | Power switch node | Connects to inductor and BST capacitor; must be minimized in PCB area to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading. |
| RT | Frequency setting | Resistor to GND sets oscillator frequency (e.g., 18.2kΩ → 2MHz); determines inductor size and efficiency trade-off. |
| SYNC | External sync/spread-spectrum control | GND = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum; not present on LT8609B variant. |
| EN/UV | Enable / input UVLO input | 1.05V rising threshold; hysteresis enables clean startup/shutdown; resistor divider programs VIN UVLO point. |
| PG | Power good open-drain flag | Pulls low until VOUT reaches ±7.5% of 5V and remains stable; valid when VIN > 3.2V regardless of EN state. |
| TR/SS | Soft-start and tracking | Capacitor sets output ramp rate; internal 2µA current source enables controlled startup and sequencing with other rails. |
| VOUT | Fixed 5V output | Regulated 5V output pin; connects to internal 8.95MΩ feedback divider; used instead of FB on fixed-output variants. |
| GND | Power and signal ground | Exposed pad (Pin 11) must be soldered to PCB ground plane for thermal conduction and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications across –40°C to 150°C junction temperature with full production test coverage. |
| Ultralow IQ Burst Mode | 2.5µA input current at no load preserves battery life in always-on systems while maintaining <10mVP-P output ripple. |
| Spread-spectrum modulation | Reduces peak EMI by ±10% frequency dithering when SYNC is biased at 3.2–5V - meets CISPR 25 Class 5 requirements. |
| Internal compensation | Eliminates external compensation components; enables stable operation with 2.2µH inductors and fast load-transient response. |
| Low dropout operation | Maintains regulation down to VIN – VOUT = 0.5V at 3A (measured at 150°C), supporting high-duty-cycle operation. |
| Robust protection suite | Includes overtemperature shutdown, cycle-by-cycle current limit (4.5A typ), and PG fault reporting for system-level monitoring. |
Applications
| GSM Transceiver Power Supply | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Powers RF transceiver ICs in cellular-connected telematics units operating from 9–16V automotive battery with strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V core supply delivering 3A peak current during TX bursts; synchronized to baseband clock via SYNC pin. Use Value: Burst Mode maintains <2.5µA standby IQ between transmissions; spread-spectrum reduces conducted emissions below CISPR 25 limits. |
Use Scenario: Supplies SoC core voltage in head-unit systems where thermal constraints require high efficiency across 10mA–3A load range. IC Role / Device Role / Timing Role: Fixed 5V buck converter with soft-start (TR/SS) for controlled power-up sequencing with DDR and GPU rails. Use Value: 45ns min-on-time enables 2MHz operation with small 2.2µH inductor; 150°C rating avoids derating in sealed enclosures. |
| Industrial Sensor Node Power | ADAS Camera Module Supply |
|
Use Scenario: Powers ultra-low-power IoT sensor nodes powered by LiSOCl₂ batteries (3.6V nominal) with 15+ year lifetime requirements. IC Role / Device Role / Timing Role: Primary 5V rail generator stepping up from single-cell battery using external boost stage; operates in Burst Mode at µA loads. Use Value: 2.5µA IQ extends battery life; internal compensation simplifies BOM; PG flag enables microcontroller wake-up confirmation. |
Use Scenario: Supplies image sensor and ISP in rear-view camera modules exposed to under-hood temperatures up to 105°C ambient. IC Role / Device Role / Timing Role: High-reliability 5V supply with AEC-Q100 H-grade qualification and thermal shutdown at 165°C. Use Value: 150°C junction rating ensures operation at elevated ambient; low EMI prevents interference with analog video signals. |
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 | I-grade (–40°C to 125°C), identical electrical specs and pinout | Lacks AEC-Q100 qualification; suitable for industrial but not automotive deployment | Select when automotive qualification is unnecessary and cost sensitivity favors standard grade. |
| LT8609AEMSE#PBF | E-grade (–40°C to 125°C), same functionality but lower temperature guarantee | Not qualified for automotive; limited to commercial/industrial environments with lower thermal stress | Choose for cost-sensitive non-automotive designs where 125°C max junction is sufficient. |
Compared with LT8609AIMSE#PBF and LT8609AEMSE#PBF, the LT8609AHMSE#PBF provides guaranteed operation up to 150°C junction temperature and formal AEC-Q100 qualification-critical for under-hood automotive use cases where thermal margin and reliability validation are mandatory.
Availability
LT8609AHMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AHMSE#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 LT8609A product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for automotive and industrial applications demanding ultralow quiescent current and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for the LT8609AHMSE#PBF?
The LT8609AHMSE#PBF is guaranteed to operate continuously across a junction temperature range of –40°C to 150°C. This H-grade rating is validated per AEC-Q100 and enables deployment in under-hood automotive locations where ambient temperatures exceed 105°C. Thermal derating begins above 125°C per Analog Devices' lifetime reliability guidelines.
Does the LT8609AHMSE#PBF support external synchronization, and how is it configured?
Yes, the LT8609AHMSE#PBF supports external synchronization via the SYNC pin. Tie SYNC to GND for low-ripple Burst Mode operation; leave floating for pulse-skipping mode; apply 3.2–5V for spread-spectrum modulation. When driven by an external clock, the LT8609AHMSE#PBF aligns SW transitions to the input clock edge and disables frequency foldback.
How does the power good (PG) flag behave on the LT8609AHMSE#PBF?
The PG pin on the LT8609AHMSE#PBF is an open-drain output that remains low until VOUT reaches and sustains ±7.5% of 5V (i.e., 4.625V–5.375V) with no fault conditions. PG is valid when VIN exceeds 3.2V, independent of EN/UV state, enabling reliable power sequencing in multi-rail systems using the LT8609AHMSE#PBF.
Can the LT8609AHMSE#PBF be used with a 2.2µH inductor at 2MHz, and what efficiency is achieved?
Yes, the LT8609AHMSE#PBF is specifically characterized for 2.2µH inductors at 2MHz. At 12VIN → 5VOUT, 1A load, efficiency exceeds 93% per the datasheet. The 45ns minimum on-time and peak current mode architecture ensure stable operation without subharmonic oscillation or excessive ripple at this frequency and inductance.
Is the LT8609AHMSE#PBF pin-compatible with other variants in the LT8609 family?
Yes, the LT8609AHMSE#PBF shares identical pinout and footprint with all 10-lead MSOP variants (e.g., LT8609AIMSE#PBF, LT8609AEMSE#PBF, LT8609HMSE#PBF). However, functional differences exist: LT8609B omits the SYNC pin, and LT8609 variants lack the fixed 5V VOUT pin (using FB instead). Always verify schematic connectivity per specific variant.
LT8609AHMSE#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
LT8609AHMSE#PBF FAQ
1.How can I place an order for LT8609AHMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHMSE#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 LT8609AHMSE#PBF reliable?
The price and inventory of LT8609AHMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AHMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHMSE#PBF?
LT8609AHMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHMSE#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 LT8609AHMSE#PBF?
For technical support, including LT8609AHMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHMSE#PBF requirements.
6.How does Aetrix verify that LT8609AHMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHMSE#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 LT8609AHMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AHMSE#PBF?
All LT8609AHMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHMSE#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 LT8609AHMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609AHMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609AHMSE#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…
