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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 8SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Down
- Output Configuration：Positive, Isolation Capable
- Topology：Buck
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：8.2V ~ 25V
- Frequency - Switching：500kHz
- Duty Cycle (Max)：96%
- Synchronous Rectifier：No
- Clock Sync：No
- Serial Interfaces：-
- Control Features：Frequency Control
- Operating Temperature：-40°C ~ 100°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SO
- Grade：-
- Qualification：-
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Overview
The LT1243IS8#PBF is a high-speed current mode pulse width modulator manufactured by Analog Devices Inc. Designed for buck topology applications, this switching controller features a fixed operating frequency of 500 kHz and supports a maximum duty cycle of 96%. It operates within an input voltage range of 8.2 V to 25 V and draws a typical supply current of 7 mA. The device is housed in an 8-SOIC surface-mount package and is rated for operation across a temperature range of -40°C to +100°C.
Feature Summary
- High-speed current mode control architecture for rapid transient response
- Fixed 500 kHz switching frequency with up to 96% duty cycle capability
- Non-isolated buck regulator design optimized for step-down conversion
Applications
- General-purpose DC-DC step-down power supplies
- Battery-powered equipment requiring efficient voltage regulation
- Industrial control systems utilizing non-isolated topologies
Procurement Notes
Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm RoHS compliance status via official documentation. Check current availability as distribution may be limited. Ensure the 8-SOIC package matches PCB footprint requirements before ordering.
Selection Notes
Select this controller for designs requiring high-speed current mode regulation at 500 kHz. It suits applications needing a wide input voltage range up to 25 V. Consider the 8-SOIC package size for space-constrained layouts. Ensure thermal management supports the specified -40°C to +100°C operating range.
Part Context
This part belongs to the LT1243 series of high-speed current mode PWM controllers from Analog Devices. It is specifically engineered for buck converter topologies, offering improved performance over earlier models like the LT1843. The IS8 suffix denotes the specific SOIC-8 package variant suitable for surface mount assembly.
Replacement Considerations
Direct substitutes include other parts within the LT1243 family such as LT1243IS8#TRPBF, which shares identical electrical characteristics but differs in tape-and-reel packaging. Verify pinout compatibility and thermal specifications when considering alternative suppliers.
