My Inquiry
My Account
Analog Devices Inc. LT8609AHDDM-5#PBF
- Part No.:
- LT8609AHDDM-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AHDDM-5#PBF.pdf
- Description:
- IC REG BUCK 5V 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:127
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609AHDDM-5#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with fixed 5V output, 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and AEC-Q100 qualification for automotive applications. It operates from 3.0V to 42V input, delivers up to 3A continuous current, and maintains <10mVP-P output ripple - ideal for GSM transceivers and low-EMI automotive power rails.
For engineers reviewing the LT8609AHDDM-5#PBF datasheet, LT8609AHDDM-5#PBF pinout, LT8609AHDDM-5#PBF application, or LT8609AHDDM-5#PBF equivalent, key selection criteria include its fixed 5V output accuracy (±7.5% PG threshold), 10-lead 3mm × 3mm side-wettable DFN package, -40°C to 150°C junction temperature rating, and integrated spread-spectrum modulation support via SYNC pin.
Technical Context
The LT8609AHDDM-5#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its oscillator frequency is programmable from 200kHz to 2.2MHz via the RT pin resistor, and it supports external synchronization or spread-spectrum modulation for EMI reduction.
Burst Mode operation enables ultralow IQ regulation down to microamp loads while maintaining tight output ripple; pulse-skipping mode is available when SYNC is floating. The device integrates top and bottom NMOS power switches (185mΩ/115mΩ typical RDS(on)) and features accurate 1V EN/UV threshold with 50mV hysteresis for reliable input UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over load/temperature - eliminates external feedback resistors and simplifies layout. |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (40V) conditions. |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT in Burst Mode - enables always-on systems with multi-year battery life. |
| Continuous Output Current | 3A - sufficient for powering infotainment processors, ADAS sensors, or CAN transceivers directly. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V) at 2MHz switching without pulse skipping. |
| PG Accuracy | ±7.5% of 5V output - provides precise power-good signaling for microcontroller reset sequencing. |
| Operating Junction Temp | -40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive use. |
Pinout & Package
LT8609AHDDM-5#PBF uses a 10-lead, 3mm × 3mm plastic DFN package with side-wettable flanks (DDM), exposing Pad 11 as GND for enhanced thermal performance (θJA = 45°C/W). The exposed pad must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass to GND. |
| BST | Bootstrap supply | Drives top NMOS gate above VIN; requires 0.1µF capacitor to SW with minimal trace length. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB 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 | Frequency setting | Resistor to GND sets fSW from 200kHz–2.2MHz; 18.2kΩ yields ~2MHz for compact magnetics. |
| SYNC | External clock interface | Enables synchronization or spread-spectrum modulation; floating = pulse-skipping mode. |
| EN/UV | Enable & input UVLO | 1.05V rising threshold with 50mV hysteresis - allows programmable VIN brownout protection. |
| TR/SS | Soft-start & tracking | Capacitor here controls VOUT ramp rate; 5V output tracks TR/SS × 6.39 for coordinated power sequencing. |
| PG | Power-good flag | Open-drain output asserts high when VOUT is within ±7.5% of 5V and no fault exists. |
| VOUT | Fixed 5V regulated output | Internal 8.95MΩ feedback divider - no external resistors needed; connects to output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load enables >10-year battery life in always-on telematics modules. |
| Spread-spectrum modulation | Reduces peak EMI by spreading switching energy across 1–6kHz band - meets CISPR 25 Class 5 limits. |
| Fast minimum on-time (45ns) | Supports 42V→5V conversion at 2MHz without duty-cycle limitation - avoids low-frequency artifacts. |
| AEC-Q100 Grade H qualification | Validated for -40°C to +150°C operation - suitable for engine control units and front-end ADAS cameras. |
| Integrated power switches | 185mΩ top / 115mΩ bottom NMOS - eliminates external MOSFETs and reduces BOM count by 4+ components. |
| Side-wettable DFN package | Enables automated optical inspection (AOI) of solder joints - improves manufacturing yield in automotive SMT lines. |
Applications
| GSM Transceiver Power | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Powering RF transceiver ICs requiring clean, low-noise 5V supply during burst transmission. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 5V with <10mVP-P ripple and fast load transient response. Use Value: Burst Mode ensures <2.5µA standby current between transmissions, extending cellular module battery life. |
Use Scenario: Supplying SoC core voltage in head-unit systems where input varies from 5.5V (cold crank) to 40V (load dump). IC Role / Device Role / Timing Role: High-input-voltage buck regulator with AEC-Q100 qualification and thermal robustness. Use Value: 150°C max junction temperature and integrated UVLO prevent system reset during harsh automotive transients. |
| Low-EMI Camera Module Supply | ADAS Sensor Hub Power |
|
Use Scenario: Providing noise-sensitive image sensor bias in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Fixed-output buck with spread-spectrum modulation to suppress switching noise near analog video paths. Use Value: EMI reduction enables compliance with CISPR 25 without added ferrite beads or shielding. |
Use Scenario: Powering multiple radar/LiDAR preprocessing ICs in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: High-current (3A) point-of-load regulator with precise PG signaling for safe boot sequencing. Use Value: ±7.5% PG threshold ensures microcontrollers only exit reset after stable 5V rail is established. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AJDDM-5#PBF | Same electrical specs and package, but rated for -40°C to +150°C with J-grade silicon - tighter FB reference tolerance (0.766V–0.798V vs H-grade 0.766V–0.794V). | Targeted at mission-critical ADAS ECUs requiring extended lifetime validation at high temperature. | Select when full AEC-Q100 J-grade reliability data and marginally improved reference stability are required. |
| LT8609AEDDM-5#PBF | Identical functionality and pinout, but rated for -40°C to +125°C (E-grade) and lower cost; FB reference tolerance 0.770V–0.794V. | Suitable for cabin electronics (e.g., HVAC control, digital clusters) with less extreme thermal requirements. | Choose for cost-sensitive non-under-hood applications where 125°C max junction temperature is sufficient. |
Compared with LT8609AJDDM-5#PBF, the LT8609AHDDM-5#PBF offers identical performance at lower qualification cost; versus LT8609AEDDM-5#PBF, it extends operational safety margin to 150°C for under-hood deployment without design changes.
Availability
LT8609AHDDM-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor hubs, telematics control units, and industrial IoT gateways requiring stable component supply across long product lifecycles.
Supply support for LT8609AHDDM-5#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 automotive, industrial, communications, and healthcare markets.
The LT8609A product line delivers high-efficiency, ultralow-IQ synchronous buck regulators optimized for automotive and battery-powered systems demanding wide input range and EMI robustness.
FAQ
What is the guaranteed operating junction temperature range for LT8609AHDDM-5#PBF?
The LT8609AHDDM-5#PBF is guaranteed to operate from –40°C to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This rating enables use in under-hood automotive applications such as engine control modules and front radar units where ambient temperatures exceed 105°C.
Does LT8609AHDDM-5#PBF require external feedback resistors for its 5V output?
No. The LT8609AHDDM-5#PBF integrates an internal 8.95MΩ feedback divider that regulates the VOUT pin precisely to 5.0V. No external resistors are needed - simplifying layout, reducing BOM count, and improving long-term output voltage stability.
How does the SYNC pin function on LT8609AHDDM-5#PBF?
The SYNC pin on LT8609AHDDM-5#PBF supports three modes: grounded for low-ripple Burst Mode, floated for pulse-skipping mode, or tied to INTVCC (3.2V–5.0V) for spread-spectrum modulation. It does not support external clock synchronization in pulse-skipping mode per datasheet Rev. J.
What is the power-good (PG) accuracy specification for LT8609AHDDM-5#PBF?
The LT8609AHDDM-5#PBF asserts PG high when VOUT reaches within ±7.5% of 5.0V (i.e., 4.625V to 5.375V) and remains high as long as output stays in regulation and no fault occurs. This tight window ensures reliable microcontroller reset release timing.
Can LT8609AHDDM-5#PBF be used in designs requiring 2MHz switching frequency?
Yes. With a 18.2kΩ resistor from RT to GND, the LT8609AHDDM-5#PBF achieves ~2.0MHz nominal switching frequency. This enables use of compact 2.2µH inductors and supports high step-down ratios while maintaining stable Burst Mode operation down to µA loads.
LT8609AHDDM-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AHDDM-5#PBF FAQ
1.How can I place an order for LT8609AHDDM-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHDDM-5#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 LT8609AHDDM-5#PBF reliable?
The price and inventory of LT8609AHDDM-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHDDM-5#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AHDDM-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHDDM-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHDDM-5#PBF?
LT8609AHDDM-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHDDM-5#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 LT8609AHDDM-5#PBF?
For technical support, including LT8609AHDDM-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHDDM-5#PBF requirements.
6.How does Aetrix verify that LT8609AHDDM-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHDDM-5#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 LT8609AHDDM-5#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AHDDM-5#PBF?
All LT8609AHDDM-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHDDM-5#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 LT8609AHDDM-5#PBF part is unused and in its original packaging.
Return procedure for LT8609AHDDM-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609AHDDM-5#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…
