| Mfr Part | Datasheet | Series | Manufacturer | Package | Topology | Product Status | Mounting Type | Switching Frequency | Function | Input Voltage | Output Voltage | Number of Outputs | Operating Temperature | Output Type | Output Current |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LT8609AEMSE16#PBF |  |
LT8609A | Analog Devices | MSOP-16 | Buck | Active | Surface Mount | 2 MHz | DC/DC Converter | 3 V – 42 V | 0.8 V – 34 V | 1 | −40°C to +125°C | Switching | 2 A |
LT8609AEMSE16#PBF
Manufacturer: Analog Devices (Linear Technology)
Logic Cells: Synchronous buck DC/DC regulator
Logic Slices: High-efficiency current-mode control
Embedded RAM (eRAM): Integrated power MOSFETs and control logic
Package: MSOP-16 (Exposed Pad)
Operating Temperature: Industrial (-40 °C to +125 °C)
Specifications
Part Number Definition
LT8609A is a monolithic synchronous step-down DC-DC switching regulator with ultra-low electromagnetic interference performance. EMSE16 refers to industrial temperature grade specification and 16-lead thermally enhanced MSOP surface mount package with exposed thermal pad. #PBF stands for lead-free tape-and-reel packaging dedicated to continuous automated high-volume SMT assembly lines.
Core Electrical Performance Parameters
This integrated buck converter adopts peak current mode control architecture, built-in high-side and low-side power MOSFETs to realize fully synchronous rectification. It accepts an ultra-wide input voltage range from 3V up to 42V, compatible with 12V automotive batteries, 24V industrial bus power and various multi-cell lithium battery packs.
The device delivers steady 3A continuous output current, with adjustable output voltage ranging from 0.782V to nearly 42V configured by external resistor divider against the internal precision reference. Its switching frequency can be flexibly programmed between 200kHz and 2.2MHz via an external resistor, and the SYNC pin supports synchronization with external clock signals or spread spectrum frequency modulation to suppress EMI noise drastically.
LT8609A is designed with slowed switching edges compared to standard LT8609 variants, which further reduces switching noise and radio frequency interference, perfectly fitting noise-sensitive automotive and industrial scenarios. Burst Mode operation is available for light-load conditions: non-switching quiescent current is merely 1.7μA under standby status, maintaining high power conversion efficiency at tiny load currents while limiting output voltage ripple below 10mV peak-to-peak.
Internal loop compensation eliminates the need for complicated external compensation networks, enabling the adoption of small-sized inductors and ceramic capacitors to shrink overall power solution volume, meanwhile achieving fast transient response against sudden load fluctuations. Multiple practical functional modules are integrated:
- Precision 1V threshold enable pin, programmable input undervoltage lockout and hardware shutdown function
- TR/SS pin for soft-start voltage ramp control, suppressing power-on inrush current and supporting multi-rail output voltage tracking
- Power good status flag pin to monitor output voltage validity and report fault conditions
Comprehensive safety protections include cycle-by-cycle current limiting, thermal shutdown with hysteresis, short-circuit foldback protection and reverse voltage prevention, effectively safeguarding the chip under abnormal working conditions. Peak conversion efficiency can reach 93% under medium load operation.
Packaging and Assembly Specifications
Encapsulated in compact 16-pin MSOP plastic housing with central exposed thermal pad. The exposed pad strengthens heat dissipation during long-duration 3A high-current operation and provides reliable low-impedance grounding for switching power circuits to restrain noise radiation. Moisture Sensitivity Level is MSL1, no time limit is required for reflow soldering procedures after the vacuum sealed package is opened. Continuous tape reel feeding seamlessly cooperates with automatic component placement machinery to guarantee uninterrupted mass electronic production.
Environmental and Compliance Standards
The operating junction temperature range spans -40°C to +125°C, delivering stable long-term operation in automotive on-board electronics, industrial field monitoring equipment, portable battery-powered instruments and communication terminal modules under extreme temperature changes and complex electromagnetic environments. Manufactured with full lead-free processes, the component complies with global RoHS environmental directives. High chip integration greatly cuts down external discrete component count and simplifies wide-input low-EMI step-down power supply hardware design.
Typical Application Fields
Automotive always-on electronic modules, vehicle navigation and tracking system power supplies
Industrial remote sensor nodes, field data loggers and outdoor monitoring terminal power rails
Portable test measurement instruments, handheld diagnostic equipment battery-powered conversion circuits
Wireless communication transceivers, RF front-end low-noise power supply units
Construction machinery auxiliary electronic control system intermediate voltage conversion modules
